Page 1
EN6360QI 8A PowerSoC
Step-Down DC-DC Switching Converter with Integrated Inductor
DESCRIPTION
The EN6360QI is an Intel® Enpirion® Power System on
a Chip (PowerSoC) DC-DC converter. It integrates the
inductor, MOSFET switches, small-signal circuits and
compensation in an advanced 8mm x 11mm x 3mm
68-pin QFN package.
The EN6360QI is specifically designed to meet the
precise voltage and fast transient requirements of
present and future high-performance, low-power
processor, DSP, FPGA, memory boards and system
level applications in distributed power architectures.
The device’s advanced circuit techniques, high
switching frequency, and proprietary integrated
inductor technology deliver high-quality, ultra
compact, non-isolated DC-DC conversion.
Intel Enpirion Power Solutions significantly help in
system design and productivity by offering greatly
simplified board design, layout and manufacturing
requirements. In addition, a reduction in the number
of components required for the complete power
solution helps to enable an overall system cost
saving.
All Enpirion products are RoHS compliant and lead-
free manufacturing environment compatible.
FEATURES
• High Efficiency (Up to 96%)
• Excellent Ripple and EMI Performance
• Up to 8A Continuous Operating Current
• Input Voltage Range (2.5V to 6.6V)
• Frequency Synchronization (Clock or Primary)
• 1.5% VOUT Accuracy (Over Load and Temperature)
• Optimized Total Solution Size (190mm2)
• Precision Enable Threshold for Sequencing
• Programmable Soft-Start
• Master/Slave Configuration for Parallel Operation
• Thermal Shutdown, Over-Current, Short Circuit,
and Under-Voltage Protection
• RoHS Compliant, MSL Level 3, 260°C Reflow
APPLICATIONS
• Point of Load Regulation for Low-Power, ASICs
Multi-Core and Communication Processors, DSPs,
FPGAs and Distributed Power Architectures
• Blade Servers, RAID Storage and LAN/SAN
Adapter Cards, Industrial Automation, Test and
Measurement, Embedded Computing, and Printers
• Beat Frequency/Noise Sensitive Applicati
Figure 1: Simplified Applications Circuit
Figure 2: Highest Efficiency in Smallest Solution
Size
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency vs. Output Current
VOUT = 3.3V
VOUT = 1.2V
CONDITIONS
VIN = 5.0V
Actual Solution Size
190mm2
DataSheeT – enpirion® power solutions
VOUT
VIN
2x
22F
1206
VOUT
ENABLE
AGND
SS
PVIN
AVIN
PGND PGND
EN6360QI
15nF
VFB
RA
RB
R1
CA
FQADJ
2x
47F
1206
RFQADJ
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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ORDERING INFORMATION
Part Number
Package Markings
TJ Rating
Package Description
EN6360QI
EN6360QI
-40°C to +125°C
68-pin (8mm x 11mm x 3mm) QFN T&R
EVB-EN6360QI
EN6360QI
QFN Evaluation Board
Packing and Marking Information: https://www.intel.com/support/quality-and-reliability/packing.html
PIN FUNCTIONS
Figure 3: Pin Diagram (Top View)
NOTE A: NC pins are not to be electrically connected to each other or to any external signal, ground or voltage. However,
they must be soldered to the PCB. Failure to follow this guideline may result in part malfunction or damage.
NOTE B: White ‘dot’ on top left is pin 1 indicator on top of the device package.
NOTE C: Keep-Out are No Connect pads that should not to be electrically connected to each other or to any external
signal, ground or voltage. They do not need to be soldered to the PCB.
NC 1
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
2
3
4
5
6
7
8
9
VOUT
VOUT
NC
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
NC
NC(SW)
NC(SW)
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
PVIN
VDDB
NC
BGND
NC
S_IN
NC
NC
NC
NC
NC
NC(SW)
NC(SW)
FQADJ
EN_PB
VSENSE
SS
EAOUT
VFB
M/S
AGND
AVIN
ENABLE
POK
S_OUT
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
48
47
46
45
44
43
42
41
40
39
38
37
36
35
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
69
PGND
KEEP OUT
KEEP OUT
KEEP OUT
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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PIN DESCRIPTIONS
PIN
NAME
TYPE
FUNCTION
1-15,
25, 44-
45, 59,
64-68
NC
-
No Connect. These pins must be soldered to PCB but not electrically
connected to each other or to any external signal, voltage, or ground.
These pins may be connected internally. Failure to follow this guideline
may result in device damage.
16-24
VOUT
Power
Regulated converter output. Connect to the load and place output filter
capacitor(s) between these pins and PGND pins. Refer to the Layout
Recommendation section.
26, 27,
62, 63
NC(SW)
-
No Connect. These pins are internally connected to the common
switching node of the internal MOSFETs. They must be soldered to PCB
but not be electrically connected to any external signal, ground, or
voltage. Failure to follow this guideline may result in device damage.
28-34
PGND
Ground
Input/Output power ground. Connect to the ground electrode of the
input and output filter capacitors. See VOUT and PVIN pin descriptions
for more details.
35-43
PVIN
Power
Input power supply. Connect to input power supply. Decouple with input
capacitor to PGND pin. Refer to the Layout Recommendation section.
46
VDDB
Power
Internal regulated voltage used for the internal control circuitry. Decouple
with an optional 0.1µF capacitor to BGND for improved efficiency. This
pin may be left floating if board space is limited.
47
BGND
Power
Ground for VDDB. Refer to pin 46 description.
48
S_IN
Analog
Digital input. A high level on the M/S pin will make this EN6360QI a Slave
and the S_IN will accept the S_OUT signal from another EN6360QI for
parallel operation. A low level on the M/S pin will make this device a
Master and the switching frequency will be phase locked to an external
clock. Leave this pin floating if it is not used.
49
S_OUT
Analog
Digital output. A low level on the M/S pin will make this EN6360QI a
Master and the internal switching PWM signal is output on this pin. This
output signal is connected to the S_IN pin of another EN6360QI device
for parallel operation. Leave this pin floating if it is not used.
50
POK
Digital
POK is a logic level high when VOUT is within -10% to +20% of the
programmed output voltage (0.9VOUT_NOM ≤ VOUT ≤ 1.2VOUT_NOM). This pin
has an internal pull-up resistor to AVIN with a nominal value of 94kΩ.
51
ENABLE
Analog
Device enable pin. A high level or floating this pin enables the device
while a low level disables the device. A voltage ramp from another power
converter may be applied for precision enable. Refer to Power Up
Sequencing
52
AVIN
Power
Analog input voltage for the control circuits. Connect this pin to the input
power supply (PVIN) at a quiet point. Can also be connected to an
auxiliary supply within a voltage range that is sequencing.
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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PIN
NAME
TYPE
FUNCTION
53
AGND
Power
The quiet ground for the control circuits. Connect to the ground plane
with a via right next to the pin.
54
M/S
Analog
Ternary (three states) input pin. Floating this pin disables parallel
operation. A low level configures the device as Master and a high level
configures the device as a Slave. A REXT resistor is recommended to
pulling M/S high. Refer to Ternary Pin description in the Functional
Description section for REXT values. Also refer to S_IN and S_OUT pin
descriptions.
55
VFB
Analog
This is the external feedback input pin. A resistor divider connects from
the output to AGND. The mid-point of the resistor divider is connected to
VFB. A feed-forward capacitor (CA) and resistor (R1) are required parallel
to the upper feedback resistor (RA). The output voltage regulation is
based on the VFB node voltage equal to 0.600V. For Slave devices, leave
VFB floating.
56
EAOUT
Analog
Error amplifier output. Allows for customization of the control loop. May
be left floating.
57
SS
Analog
A soft-start capacitor is connected between this pin and AGND. The value
of the capacitor controls the soft-start interval. Refer to Soft-Start
Operation in the Functional Description section for more details.
58
VSENSE
Analog
This pin senses output voltage when the device is in pre-bias (or back-
feed) mode. Connect VSENSE to VOUT when EN_PB is high or floating.
Leave floating when EN_PB is low.
60
FQADJ
Analog
Frequency adjust pin. This pin must have a resistor to AGND which sets
the free running frequency of the internal oscillator.
61
EN_PB
Analog
Enable pre-bias input. When this pin is pulled high, the device will
support monotonic start-up under a pre-biased load. VSENSE must be
tied to VOUT for EN_PB to function. This pin is pulled high internally.
Enable pre-bias feature is not available for parallel operations.
69
PGND
Ground
Power ground thermal pad. Not a perimeter pin. Connect thermal pad to
the system GND plane for heat-sinking purposes. Refer to the Layout
Recommendation section.
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ABSOLUTE MAXIMUM RATINGS
CAUTION: Absolute Maximum ratings are stress ratings only. Functional operation beyond the recommended
operating conditions is not implied. Stress beyond the absolute maximum ratings may impair device
life. Exposure to absolute maximum rated conditions for extended periods may affect device reliability.
Absolute Maximum Pin Ratings
PARAMETER
SYMBOL
MIN
MAX
UNITS
PVIN, AVIN, VOUT
-0.3
7.0
V
ENABLE, POK, M/S
-0.3
VIN+0.3
V
VFB, EXTREF, EAOUT, SS, S_IN,
S_OUT, FQADJ
-0.3
2.5
V
Absolute Maximum Thermal Ratings
PARAMETER
CONDITION
MIN
MAX
UNITS
Maximum Operating Junction
Temperature
+150
°C
Storage Temperature Range
-65
+150
°C
Reflow Peak Body
Temperature
(10 Sec) MSL3 JEDEC J-STD-020A
+260
°C
Absolute Maximum ESD Ratings
PARAMETER
CONDITION
MIN
MAX
UNITS
HBM (Human Body Model)
±2000
V
CDM (Charged Device Model)
±500
V
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN
MAX
UNITS
Input Voltage Range
VIN
2.7
6.6
V
Output Voltage Range
VOUT
0.6
VIN – VDO (1)
V
Output Current Range
IOUT
8
A
Operating Ambient Temperature Range
TA
-40
+85
°C
Operating Junction Temperature
TJ
-40
+125
°C
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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THERMAL CHARACTERISTICS
PARAMETER
SYMBOL
TYPICAL
UNITS
Thermal Shutdown
TSD
150
°C
Thermal Shutdown Hysteresis
TSDHYS
20
°C
Thermal Resistance: Junction to Ambient (0 LFM) (2)
JA
15
°C/W
Thermal Resistance: Junction to Case (0 LFM)
JC
1.0
°C/W
(1) VDO (dropout voltage) is defined as (ILOAD x Droput Resistance). Please refer to Electrical Characteristics Table.
(2) Based on 2oz. external copper layers and proper thermal design in line with EIJ/JEDEC JESD51-7 standard for high
thermal conductivity boards.
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ELECTRICAL CHARACTERISTICS
NOTE: VIN = 6.6V, Minimum and Maximum values are over operating ambient temperature range unless
otherwise noted. Typical values are at TA = 25°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Operating Input
Voltage
VIN
2.5
6.6
V
Feedback Pin Voltage
VFB
Internal Voltage Reference at:
VIN = 5V, ILOAD = 0, TA = 25°C
0.594
0.600
0.606
V
Feedback Pin Voltage
(Load, Temp.)
VFB
0A ≤ ILOAD ≤ 8A
Starting Date Code: X501 or
greater
0.591
0.600
0.609
V
VFB Pin Voltage
(Line, Load and
Temperature)
VVFB
2.5V ≤ VIN ≤ 6.6V
0A ≤ ILOAD ≤ 8A
0.588
0.600
0.612
V
Feedback pin Input
Leakage Current (3)
IFB
VFB pin input leakage current
-10
10
nA
Shut-Down Supply
Current
IS
Power Supply Current with
ENABLE=0
1.5
mA
Under Voltage Lock-
Out – VIN Rising
VUVLOR
Voltage above which UVLO is
not asserted
2.2
V
Under Voltage Lock-
Out – VIN Falling
VUVLOF
Voltage below which UVLO is
asserted
2.1
V
Drop-Out Voltage
VDO
VINMIN - VOUT at full load
400
800
mV
Drop-Out Resistance
RDO
Input to output resistance
50
100
m
Continuous Output
Current
IOUT_SRC
0
8
A
Over Current Trip Level
IOCP
Sourcing Current
16
A
Switching Frequency
FSW
RFADJ = 4.42 kΩ, VIN = 5V
0.9
1.2
1.5
MHz
External SYNC Clock
Frequency Lock Range
FPLL_LOCK
SYNC Clock Input Frequency
Range
0.9*Fsw
Fsw
1.1*Fs
w
MHz
S_IN Clock Amplitude –
Low
VS_IN_LO
SYNC Clock Logic Low
0
0.8
V
S_IN Clock Amplitude –
High
VS_IN_HI
SYNC Clock Logic High
1.8
2.5
V
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
S_IN Clock Duty Cycle
(PLL)
DCS_INPLL
M/S Pin Float or Low
20
80
%
S_IN Clock Duty Cycle
(PWM)
DCS_INPWM
M/S Pin High
10
90
%
Pre-Bias Level
VPB
Allowable Pre-bias as a
Fraction of Programmed
Output Voltage for Monotonic
start up. Minimum Pre-bias
Voltage = 300mV.
20
75
%
Non-Monotonicity
VPB_NM
Allowable Non-monotonicity
Under Pre-bias Startup
100
mV
VOUT Range for POK =
High(4)
Range of Output Voltage as a
Fraction of Programmed
Value When POK is Asserted.
90
120
%
POK Deglitch Delay
Falling Edge Deglitch Delay
After Output Crossing 90%
level. FSW=1.2 MHz
213
µs
VPOK Logic Low level
With 4mA Current Sink into
POK Pin
0.4
V
VPOK Logic high level
VIN
V
POK Internal pull-up
resistor
94
k
Current Balance
IOUT
With 2 to 4 Converters in
Parallel, the Difference
Between Nominal and Actual
Current Levels.
VIN<50mV; RTRACE< 10 m,
Iload= # Converter * IMAX
+/-10
%
VOUT Rise Time
Accuracy(3)
TRISE
tRISE [ms] = CSS [nF] x 0.065;
10nF ≤ CSS ≤ 30nF(5) (6)
-25
+25
%
ENABLE Logic High
VENABLE_HIGH
2.5V ≤ VIN ≤ 6.6V
1.2
VIN
V
ENABLE Logic Low
VENABLE_LOW
0
0.8
V
ENABLE Pin Current
IEN
VIN = 6.6V
50
A
M/S Ternary Pin Logic
Low
VT-LOW
Tie M/S Pin to GND
0
0.7
V
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
M/S Ternary Pin Logic
Float
VT-FLOAT
M/S Pin is Open
1.1
1.4
V
M/S Ternary Pin Logic
High(7)
VT-HIGH
Pull Up to VIN through an
external resistor REXT . Refer to
Figure 7.
1.8
V
Ternary Pin Input
Current
ITERN
2.5V ≤ VIN ≤ 4V, REXT = 15kΩ
4V < VIN ≤ 6.6V, REXT = 51kΩ
117
88
A
Binary Pin Logic Low
Threshold
VB-LOW
ENABLE, S_IN
0.8
V
Binary Pin Logic High
Threshold
VB-HIGH
ENABLE, S_IN
1.8
V
S_OUT Low Level
VS_OUT_LOW
0.4
V
S_OUT High Level
VS_OUT_HIGH
2.0
V
(3) Parameter not production tested but is guaranteed by design.
(4) POK threshold when VOUT is rising is nominally 92%. This threshold is 90% when VOUT is falling. After crossing the
90% level, there is a 256 clock cycle (~213µs at 1.2 MHz) delay before POK is de-asserted. The 90% and 92% levels are
nominal values. Expect these thresholds to vary by ±3%.
(5) Rise time calculation begins when AVIN > VUVLO and ENABLE = HIGH.
(6) VOUT Rise Time Accuracy does not include soft-start capacitor tolerance.
(7) M/S pin is ternary. Ternary pins have three logic levels: high, float, and low. This pin is meant to be strapped to VIN
through an external resistor, strapped to GND, or left floating. The state cannot be changed while the device is on.
06489 October 16, 2019 Rev J
Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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TYPICAL PERFORMANCE CURVES
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency vs. Output Current
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
VOUT = 1.0V
CONDITIONS
VIN = 3.3V
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency vs. Output Current
VOUT = 3.3V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
VOUT = 1.0V
CONDITIONS
VIN = 5.0V
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
0 1 2 3 4 5 6 7 8
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage vs. Output Current
VOUT = 1.8V
CONDITIONS
VIN = 3.3V
0.980
0.985
0.990
0.995
1.000
1.005
1.010
1.015
1.020
0 1 2 3 4 5 6 7 8
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage vs. Output Current
VOUT = 1.0V
CONDITIONS
VIN = 3.3V
3.280
3.285
3.290
3.295
3.300
3.305
3.310
3.315
3.320
0 1 2 3 4 5 6 7 8
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage vs. Output Current
VOUT = 3.3V
CONDITIONS
VIN = 5.0V
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
0 1 2 3 4 5 6 7 8
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage vs. Output Current
VOUT = 1.8V
CONDITIONS
VIN = 5.0V
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
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TYPICAL PERFORMANCE CURVES (CONTINUED)
0.980
0.985
0.990
0.995
1.000
1.005
1.010
1.015
1.020
012345678
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage vs. Output Current
VOUT = 1.0V
CONDITIONS
VIN = 5.0V
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
2.4 3 3.6 4.2 4.8 5.4 6 6.6
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Voltage vs. Input Voltage
CONDITIONS
Load = 0A
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
2.4 3 3.6 4.2 4.8 5.4 6 6.6
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Voltage vs. Input Voltage
CONDITIONS
Load = 4A
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
2.4 3 3.6 4.2 4.8 5.4 6 6.6
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Output Voltage vs. Input Voltage
CONDITIONS
Load = 8A
1.794
1.795
1.796
1.797
1.798
1.799
1.800
1.801
1.802
-40 -15 10 35 60 85
OUTPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
Output Voltage vs. Temperature
LOAD = 0A
LOAD = 2A
LOAD = 4A
LOAD = 6A
LOAD = 8A
CONDITIONS
VIN = 6.6V
VOUT_NOM = 1.8V
1.794
1.795
1.796
1.797
1.798
1.799
1.800
1.801
1.802
-40 -15 10 35 60 85
OUTPUT VOLTAGE (V)
AMBIENT TEMPERATURE (C)
Output Voltage vs. Temperature
LOAD = 0A
LOAD = 2A
LOAD = 4A
LOAD = 6A
LOAD = 8A
CONDITIONS
VIN = 5V
VOUT_NOM = 1.8V
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TYPICAL PERFORMANCE CURVES (CONTINUED)
1.794
1.795
1.796
1.797
1.798
1.799
1.800
1.801
1.802
-40 -15 10 35 60 85
OUTPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
Output Voltage vs. Temperature
LOAD = 0A
LOAD = 2A
LOAD = 4A
LOAD = 6A
LOAD = 8A
CONDITIONS
VIN = 3.6V
VOUT_NOM = 1.8V
1.794
1.795
1.796
1.797
1.798
1.799
1.800
1.801
1.802
-40 -15 10 35 60 85
OUTPUT VOLTAGE (V)
AMBIENT TEMPERATURE (°C)
Output Voltage vs. Temperature
LOAD = 0A
LOAD = 2A
LOAD = 4A
LOAD = 6A
LOAD = 8A
CONDITIONS
VIN = 2.5V
VOUT_NOM = 1.8V
0
1
2
3
4
5
6
7
8
9
10
-40 -15 10 35 60 85
GUARANTEED OUTPUT CURRENT (A)
AMBIENT TEMPERATURE(°C)
No Thermal Derating
Conditions
VIN = 5.0V
VOUT = 3.3V
CONDITIONS
VIN = 5.0V
VOUT = 3.3V
0
1
2
3
4
5
6
7
8
9
10
-40 -15 10 35 60 85
GUARANTEED OUTPUT CURRENT (A)
AMBIENT TEMPERATURE(°C)
No Thermal Derating
Conditions
VIN = 5.0V
VOUT = 3.3V
CONDITIONS
VIN = 5.0V
VOUT = 1.0V
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
10 100 1000
LEVEL (dBµV/m)
FREQUENCY (MHz)
EMI Performance (Horizontal Scan)
CONDITIONS
VIN = 5.0V
VOUT_NOM = 1.5V
LOAD = 0.2Ω
CISPR 22 Class B 3m
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
10 100 1000
LEVEL (dBµV/m)
FREQUENCY (MHz)
EMI Performance (Vertical Scan)
CONDITIONS
VIN = 5.0V
VOUT_NOM = 1.5V
LOAD = 0.2Ω
CISPR 22 Class B 3m
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TYPICAL PARALLEL PERFORMACE CHARACTERISTICS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16
EFFICIENCY (%)
OUTPUT CURRENT (A)
Parallel Efficiency
vs. Output Current
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
VOUT = 1.0V
CONDITIONS
VIN = 3.3V
2x EN6360QI
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16
EFFICIENCY (%)
OUTPUT CURRENT (A)
Parallel Efficiency
vs. Output Current
VOUT = 3.3V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.2V
VOUT = 1.0V
CONDITIONS
VIN = 5.0V
2x EN6360QI
-5
-4
-3
-2
-1
0
1
2
3
4
5
2 4 6 8 10 12 14 16
CURRENT MIS-MATCH (%)
OUTPUT CURRENT (A)
Parallel Current Share Mis-Match
Mis-match (%) = (I_Master - I_Slave ) / I_Average x 100
CONDITIONS
EN6360QI
VIN = 5V
VOUT = 3.3V
0
1
2
3
4
5
6
7
8
9
10
2 4 6 8 10 12 14 16
INDIVIDUAL OUTPUT CURRENT (A)
TOTAL OUTPUT CURRENT (A)
Parallel Current Share Breakdown
Master Device
Slave Device
CONDITIONS
EN6360QI
VIN = 5V
VOUT = 3.3V
3.2
3.22
3.24
3.26
3.28
3.3
3.32
3.34
3.36
3.38
3.4
0 2 4 6 8 10 12 14 16
PARALLEL OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Parallel Output Voltage
vs. Output Current
VOUT = 3.3V
CONDITIONS
VIN = 5.0V
2x EN6360QI
0.9
0.92
0.94
0.96
0.98
1
1.02
1.04
1.06
1.08
1.1
0 2 4 6 8 10 12 14 16
PARALLEL OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Parallel Output Voltage
vs. Output Current
VOUT = 1.0V
CONDITIONS
VIN = 3.3V
2x EN6360QI
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TYPICAL PERFORMANCE CHARACTERISTICS
VOUT
(AC Coupled)
Output Ripple at 20MHz Bandwidth
CONDITIONS
VIN = 5V
VOUT = 1V
IOUT = 8A
CIN = 2 x 22µF (1206)
COUT = 2 x 47 µF (1206)
VOUT
(AC Coupled)
Output Ripple at 500MHz Bandwidth
CONDITIONS
VIN = 5V
VOUT = 1V
IOUT = 8A
CIN = 2 x 22µF (1206)
COUT = 2 x 47 µF (1206)
VOUT
(AC Coupled)
Output Ripple at 20MHz Bandwidth
CONDITIONS
VIN = 5V
VOUT = 2.4V
IOUT = 8A
CIN = 2 x 22µF (1206)
COUT = 2 x 47 µF (1206)
VOUT
(AC Coupled)
Output Ripple at 500MHz Bandwidth
CONDITIONS
VIN = 5V
VOUT = 2.4V
IOUT = 8A
CIN = 2 x 22µF (1206)
COUT = 2 x 47 µF (1206)
ENABLE
Enable Power Up/Down
CONDITIONS
VIN = 5V
VOUT = 1.0V
IOUT = 8A
Css = 15nF
CIN = 2 x 22µF (1206)
COUT = 2 x 47 µF (1206)
VOUT
ENABLE
Enable Power Up/Down
CONDITIONS
VIN = 5V
VOUT = 2.4V
IOUT = 8A
Css = 15nF
CIN = 2 x 22µF (1206)
COUT = 2 x 47 µF (1206)
VOUT
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TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
ENABLE
Enable/Disable with POK
CONDITIONS
VIN = 5V, VOUT = 1.0V
LOAD = 5A, Css= 15nF
VOUT
POK
LOAD
VOUT
(AC Coupled)
Load Transient from 0 to 8A
CONDITIONS
VIN = 6.2V
VOUT = 1.5V
CIN = 2 x 22µF (1206)
COUT = 2 x 47µF (1206)
LOAD
Parallel Operation SW Waveforms
CONDITIONS
VIN = 5V
VOUT = 1.8V
LOAD = 18A
COMBINED LOAD(18A)
MASTER VSW
SLAVE 2 VSW
SLAVE 1 VSW
Parallel Operation Current Sharing
CONDITIONS
VIN = 5V
VOUT = 1.8V
LOAD = 18A
SLAVE 1 LOAD = 6A
SLAVE 2 LOAD = 6A
TOTAL LOAD = 18A
MASTER LOAD = 6A
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FUNCTIONAL BLOCK DIAGRAM
Figure 4: Functional Block Diagram
FUNCTIONAL DESCRIPTION
Synchronous DC-DC Step-Down PowerSoC
The EN6360QI is a synchronous, programmable buck power supply with integrated power MOSFET switches
and integrated inductor. The switching supply uses voltage mode control and a low noise PWM topology. This
provides superior impedance matching to ICs processed in sub 90nm process technologies. The nominal input
voltage range is 2.5 - 6.6 volts. The output voltage is programmed using an external resistor divider network.
The feedback control loop incorporates a type IV voltage mode control design. Type IV voltage mode control
maximizes control loop bandwidth and maintains excellent phase margin to improve transient performance.
The EN6360QI is designed to support up to 8A continuous output current operation. The operating switching
frequency is between 0.9MHz and 1.5MHz and enables the use of small-size input and output capacitors.
Soft Start
Power
Good
Logic
Bandgap
Reference
MUX
Compensation
Network
Thermal Limit
UVLO
Current Limit P-Drive
N-Drive
PLL/Sawtooth
Generator
FQADJ
ENABLE
SS
AGND
POK
VSENSE
VFB
PGND
S_OUT
NC(SW)
PVIN
To PLL
Error
Amp
PWM
Comp
(+)
(-)
(-)
(+)
Digital I/O
S_IN
M/S VDDB
VOUT
AVIN
AVIN
EN_PB
Reference
Voltage
Selector
EAOUT
EAOUT
MUX
AVIN
AVIN
BGND
Eff
94k
24k
24k
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The power supply has the following features:
• Precision Enable Threshold
• Soft-Start
• Pre-bias Start-Up
• Resistor Programmable Switching Frequency
• Phase-Lock Frequency Synchronization
• Parallel Operation
• Power OK
• Over-Current/Short Circuit Protection
• Thermal Shutdown with Hysteresis
• Under-Voltage Lockout
Precision Enable Operation
The ENABLE threshold is a precision analog voltage rather than a digital logic threshold. A precision voltage
reference and a comparator circuit are kept powered up even when ENABLE is de-asserted. The narrow voltage
gap between ENABLE Logic Low and ENABLE Logic High allows the device to turn on at a precise enable
voltage level. With the enable threshold pinpointed, a proper choice of soft-start capacitor helps to accurately
sequence multiple power supplies in a system as desired. There is an ENABLE lockout time of 2ms that
prevents the device from re-enabling immediately after it is disabled. See the Electrical Characteristics Table
for technical specifications for the ENABLE pin.
Soft-Start Operation
The SS pin in conjunction with a small external capacitor between this pin and AGND provides a soft-start
function to limit in-rush current during device power-up. When the part is initially powered up, the output
voltage is gradually ramped to its final value. The gradual output ramp is achieved by increasing the reference
voltage to the error amplifier. A constant current flowing into the soft-start capacitor provides the reference
voltage ramp. When the voltage on the soft-start capacitor reaches 0.60V, the output has reached its
programmed voltage. Once the output voltage has reached nominal voltage the soft-start capacitor will
continue to charge to 1.5V (Typical). The output rise time can be controlled by the choice of soft-start capacitor
value.
The rise time is defined as the time from when the ENABLE signal crosses the threshold and the input voltage
crosses the upper UVLO threshold to the time when the output voltage reaches 95% of the programmed value.
The rise time (tRISE) is given by the following equation:
tRISE [ms] = Css [nF] x 0.065
The rise time (tRISE) is in milliseconds and the soft-start capacitor (CSS) is in nano-Farads. The soft-start capacitor
should be between 10nF and 100nF.
Pre-Bias Start-up
The EN6360QI supports startup into a pre-biased load. A proprietary circuit ensures the output voltage rises
up from the pre-bias value to the programmed output voltage. Start-up is guaranteed to be monotonic for
pre-bias voltages in the range of 20% to 75% of the programmed output voltage with a minimum pre-bias
voltage of 300mV. Outside of the 20% to 75% range, the output voltage rise will not be monotonic. The Pre-
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Bias feature is automatically engaged with an internal pull-up resistor. For this feature to work properly, VIN
must be ramped up prior to ENABLE turning on the device. Tie VSENSE to VOUT if Pre-Bias is used. Tie EN_PB
to ground and leave VSENSE floating to disable the Pre-Bias feature. Pre-Bias is supported for external clock
synchronization, but not supported for parallel operations.
Resistor Programmable Frequency
The operation of the EN6360QI can be optimized by a proper choice of the RFQADJ resistor. The frequency can
be tuned to optimize dynamic performance and efficiency. Refer to Table 1 for recommended RFQADJ values.
Table 1: Recommended RFQADJ (k)
VOUT
VIN
0.8V
1.2V
1.5V
1.8V
2.5V
3.3V
3.3V 10%
3.57
3.57
4.99
5.49
5.49
NA
5.0V 10%
3.57
3.57
4.99
5.49
5.49
4.99
6.0V 10%
3.57
3.57
4.99
5.49
5.49
5.49
Phase-Lock Operation
The EN6360QI can be phase-locked to an external clock signal to synchronize its switching frequency. The
M/S pin can be left floating or pulled to ground to allow the device to synchronize with an external clock signal
using the S_IN pin. When a clock signal is present at S_IN, an activity detector recognizes the presence of the
clock signal and the internal oscillator phase locks to the external clock. The external clock could be the system
clock or the output of another EN6360QI. The phase locked clock is then output at S_OUT. Refer to Table 2
for recommended clock frequencies.
Table 2: Recommended Clock fsw (MHz)±10%
VOUT
VIN
0.8V
1.2V
1.5V
1.8V
2.5V
3.3V
3.3V 10%
1.15
1.15
1.30
1.35
1.35
NA
5.0V 10%
1.15
1.15
1.30
1.35
1.35
1.30
6.0V 10%
1.15
1.15
1.30
1.35
1.35
1.35
Master / Slave (Parallel) Operation and Frequency Synchronization
Multiple EN6360QI devices may be connected in a Master/Slave configuration to handle larger load currents.
The device is placed in Master mode by pulling the M/S pin low or in Slave mode by pulling M/S pin high. When
the M/S pin is in float state, parallel operation is not possible. In Master mode, a version of the internal
switching PWM signal is output on the S_OUT pin. This PWM signal from the Master is fed to the Slave device
at its S_IN pin. The Slave device acts like an extension of the power FETs in the Master and inherits the PWM
frequency and duty cycle. The inductor in the Slave prevents crow-bar currents from Master to Slave due to
timing delays. The Master device’s switching clock may be phase-locked to an external clock source or another
EN6360QI to move the entire parallel operation frequency away from sensitive frequencies. The feedback
network for the Slave device may be left open. Additional Slave devices may be paralleled together with the
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Master by connecting the S_OUT of the Master to the S_IN of all other Slave devices. Refer to Figure 5 for
details.
Careful attention is needed in the layout for parallel operation. The VIN, VOUT and GND of the paralleled
devices should have low impedance connections between each other. Maximize the amount of copper used
to connect these pins and use as many vias as possible when using multiple layers. Place the Master device
between all other Slaves and closest to the point of load.
Figure 5: Master/Slave Parallel Operation Diagram POK Operation
EN6360QI
MASTER
EN6360QI
SLAVE1
S_OUT
S_IN
S_IN
VOUT
VOUT
VOUT
VIN
VIN
VIN
GND
GND
GND
VFB
VFB
VFB
Feedback &
Compensation
OPEN
OPEN
VIN
VOUT
M/S
M/S
M/S
EN6360QI
SLAVE2
EN6360QI
SLAVE3
S_IN
VOUT
VIN
GND
VFB
M/S
REXT
REXT
REXT
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POK Operation
The POK signals that the output voltage is within the specified range. The POK signal is asserted high when
the rising output voltage crosses 92% (nominal) of the programmed output voltage. If the output voltage falls
outside the range of 90% to 120%, POK remains asserted for the de-glitch time (213µs at 1.2MHz). After the
de-glitch time, POK is de-asserted. POK is also de-asserted if the output voltage exceeds 120% of the
programmed output voltage.
Over-Current Protection (OCP)
The current limit function is achieved by sensing the current flowing through a sense P-FET. When
the sensed current exceeds the current limit, both power FETs are turned off for the rest of the
switching cycle. If the over-current condition is removed, the over-current protection circuit will re-
enable PWM operation. If the over-current condition persists, the circuit will continue to protect the
load. The OCP trip point is nominally set as specified in the Electrical Characteristics table. In the
event the OCP circuit trips consistently in normal operation, the device enters a hiccup mode. The
device is disabled for 27ms and restarted with a normal soft-start. This cycle can continue indefinitely
as long as the over current condition persists.
Thermal Protection
Temperature sensing circuits in the controller will disable operation when the junction temperature exceeds
approximately 150°C. Once the junction temperature drops by approx 20°C, the converter will re-start with a
normal soft-start.
Input Under-Voltage Lock-Out (UVLO)
When the input voltage is below a required voltage level (VUVHI) for normal operation, the converter switching
is inhibited. The lock-out threshold has hysteresis to prevent chatter. Thus when the device is operating
normally, the input voltage has to fall below the lower threshold (VUVLO) for the device to stop switching.
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APPLICATION INFORMATION
Output Voltage Programming and loop Compensation
The EN6360QI output voltage is programmed using a simple resistor divider network. A phase lead capacitor
plus a resistor are required for stabilizing the loop. Figure 6 shows the required components and the equations
to calculate their values.
The EN6360QI output voltage is determined by the voltage presented at the VFB pin. This voltage is set by
way of a resistor divider between VOUT and AGND with the midpoint going to VFB.
The EN6360QI uses a type IV compensation network. Most of this network is integrated. However, a phase
lead capacitor and a resistor are required in parallel with upper resistor of the external feedback network (Refer
to Figure 6). Total compensation is optimized for use with two 47μF output capacitance and will result in a
wide loop bandwidth and excellent load transient performance for most applications. Additional capacitance
may be placed beyond the voltage sensing point outside the control loop. Voltage mode operation provides
high noise immunity at light load. Furthermore, voltage mode control provides superior impedance matching
to ICs processed in sub 90nm technologies.
In some cases modifications to the compensation or output capacitance may be required to optimize device
performance such as transient response, ripple, or hold-up time. The EN6360QI provides the capability to
modify the control loop response to allow for customization for such applications. For more information,
contact Power Applications support.
Figure 6: External Feedback/Compensation Network
The feedback and compensation network values depend on the input voltage and output voltage. Calculate
the external feedback and compensation network values with the equations below.
RA [Ω] = 48,400 x VIN [V]
RB[Ω] = (VFB x RA) / (VOUT – VFB) [V]
VFB = 0.6V nominal
*Round RA & RB to closest standard value
CA [F] = 3.83 x 10-6 / RA [Ω]
*Round CA down to closest standard value
R1 = 15kΩ
CA
VOUT
VFB
RA
R1
RB
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The feedback resistor network should be sensed at the last output capacitor close to the device. Keep the
trace to VFB pin as short as possible. Whenever possible, connect RB directly to the AGND pin instead of going
through the GND plane.
Input Capacitor Selection
The EN6360QI has been optimized for use with two 1206 22µF input capacitors. Low ESR ceramic capacitors
are required with X5R or X7R dielectric formulation. Y5V or equivalent dielectric formulations must not be
used as these lose capacitance with frequency, temperature and bias voltage.
In some applications, lower value ceramic capacitors may be needed in parallel with the larger capacitors in
order to provide high frequency decoupling. The capacitors shown in the table below are typical input
capacitors. Other capacitors with similar characteristics may also be used.
Table 3: Recommended Input Capacitors
Description
MFG
P/N
22µF, 10V, 20%, X5R, 1206
(2 capacitors needed)
Murata
GRM31CR61A226ME19L
Taiyo Yuden
LMK316BJ226ML-T
Output Capacitor Selection
The EN6360QI has been optimized for use with two 1206 47µF output capacitors. Low ESR, X5R or X7R
ceramic capacitors are recommended as the primary choice. Y5V or equivalent dielectric formulations must
not be used as these lose capacitance with frequency, temperature and bias voltage. The capacitors shown in
the Recommended Output Capacitors table are typical output capacitors. Other capacitors with similar
characteristics may also be used. Additional bulk capacitance from 100µF to 1000µF may be placed beyond
the voltage sensing point outside the control loop. This additional capacitance should have a minimum ESR of
6mΩ to ensure stable operation. Most tantalum capacitors will have more than 6mΩ of ESR and may be used
without special care. Adding distance in layout may help increase the ESR between the feedback sense point
and the bulk capacitors.
Table 4: Recommended Output Capacitors
Description
MFG
P/N
47µF, 10V, 20%, X5R, 1206
(2 capacitors needed)
Taiyo Yuden
LMK316BJ476ML-T
47µF, 6.3V, 20%, X5R, 1206
(2 capacitors needed)
Murata
GRM31CR60J476ME19L
Taiyo Yuden
JMK316BJ476ML-T
10µF, 6.3V, 10%, X7R, 0805
(Optional 1 capacitor in parallel with 2x47µF)
Murata
GRM21BR70J106KE76L
Taiyo Yuden
JMK212B7106KG-T
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Output ripple voltage is primarily determined by the aggregate output capacitor impedance. Placing multiple
capacitors in parallel reduces the impedance and hence will result in lower ripple voltage.
nTotal ZZZZ 1
...
111
21
+++=
Table 5: Typical Ripple Voltages
Output Capacitor Configuration
Typical Output Ripple (mVp-p)
2 x 47 µF
<10mV
† 20 MHz bandwidth limit measured on Evaluation Board
M/S - Ternary Pin
M/S is a ternary pin. This pin can assume 3 states – A low state (0V to 0.7V), a high state (1.8V to VIN) and a
float state (1.1V to 1.4V). Device operation is controlled by the state of the pin. The pins may be pulled to
ground or left floating without any special care. When pulling high to VIN, a series resistor is recommended.
The resistor value may be optimized to reduce the current drawn by the pin. The resistance should not be too
high as in that case the pin may not recognize the high state. The recommend resistance (REXT) value is given
in the following table.
Table 6: Recommended REXT Resistor
VIN (V)
IMAX (µA)
REXT (kΩ)
2.5 – 4.0
117
15
4.0 – 6.6
88
51
Figure 7: Selection of REXT to Connect M/S pin to VIN
2.5V
To Gates
REXT
R1
134k
R2
134k
To VIN R3
319
D1
Vf 2V
Inside EN6360QI
AGND
M/S
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Table 7: M/S (Master/Slave) Pin States
M/S Pin
Function
Low
(0V to 0.7V)
M/S pin is pulled to ground directly. This is the Master mode. Switching
PWM phase will lock onto S_IN external clock if a signal is available.
S_OUT outputs a version of the internal switching PWM signal.
Float
(1.1V to 1.4V)
M/S pin is left floating. Parallel operation is not feasible. Switching PWM
phase will lock onto S_IN external clock if a signal is available. S_OUT
outputs a version of the internal switching PWM signal.
High
(>1.8V)
M/S pin is pulled to VIN with REXT. This is the Slave mode. The S_IN
signal of the Slave should connect to the S_OUT of the Master device.
This signal synchronizes the switching frequency and duty cycle of the
Master to the Slave device.
Power-Up Sequencing
During power-up, ENABLE should not be asserted before PVIN, and PVIN should not be asserted before AVIN.
Tying all three pins together meets these requirements.
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THERMAL CONSIDERATIONS
Thermal considerations are important power supply design facts that cannot be avoided in the real world.
Whenever there are power losses in a system, the heat that is generated by the power dissipation needs to be
accounted for. The Intel Enpirion PowerSoC helps alleviate some of those concerns.
The Intel Enpirion EN6360QI DC-DC converter is packaged in an 8x11x3mm 68-pin QFN package. The QFN
package is constructed with copper lead frames that have exposed thermal pads. The exposed thermal pad
on the package should be soldered directly on to a copper ground pad on the printed circuit board (PCB) to
act as a heat sink. The recommended maximum junction temperature for continuous operation is 125°C.
Continuous operation above 125°C may reduce long-term reliability. The device has a thermal overload
protection circuit designed to turn off the device at an approximate junction temperature value of 150°C.
The EN6360QI is guaranteed to support the full 8A output current up to 85°C ambient temperature. The
following example and calculations illustrate the thermal performance of the EN6360QI.
Example:
VIN = 5V
VOUT = 3.3V
IOUT = 8A
First calculate the output power.
POUT = 3.3V x 8A = 26.4W
Next, determine the input power based on the efficiency (η) shown in Figure 8.
Figure 6: Efficiency vs. Output Current
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency vs. Output Current
VOUT = 3.3V
CONDITIONS
VIN = 5.0V
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For VIN = 5V, VOUT = 3.3V at 8A, η ≈ 94%
η = POUT / PIN = 94% = 0.94
PIN = POUT / η
PIN ≈ 26.4W / 0.94 ≈ 28.085W
The power dissipation (PD) is the power loss in the system and can be calculated by subtracting the output
power from the input power.
PD = PIN – POUT
≈ 28.085W – 26.4W ≈ 1.685W
With the power dissipation known, the temperature rise in the device may be estimated based on the theta JA
value (θJA). The θJA parameter estimates how much the temperature will rise in the device for every watt of
power dissipation. The EN6360QI has a θJA value of 15 ºC/W without airflow.
Determine the change in temperature (ΔT) based on PD and θJA.
ΔT = PD x θJA
ΔT ≈ 1.685W x 15°C/W = 25.28°C ≈ 25.3°C
The junction temperature (TJ) of the device is approximately the ambient temperature (TA) plus the change in
temperature. We assume the initial ambient temperature to be 25°C.
TJ = TA + ΔT
TJ ≈ 25°C + 25.3°C ≈ 50.3°C
With 1.685W dissipated into the device, the TJ will be 50.3°C.
The maximum operating junction temperature (TJMAX) of the device is 125°C, so the device can operate at a
higher ambient temperature. The maximum ambient temperature (TAMAX) allowed can be calculated.
TAMAX = TJMAX – PD x θJA
≈ 125°C – 25.3°C ≈ 99.7°C
The ambient temperature can actually rise by another 74.7°C, bringing it to 99.7°C before the device will reach
TJMAX. This indicates that the EN6360QI can support the full 8A output current range up to approximately
99.7°C ambient temperature given the input and output voltage conditions. This allows the EN6360QI to
guarantee full 8A output current capability at 85°C with room for margin. Note that the efficiency will be slightly
lower at higher temperatures and this estimate will be slightly lower.
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ENGINEERING SCHEMATIC
Figure 9: Engineering Schematic with Engineering Notes
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LAYOUT RECOMMENDATIONS
Figure 10: Top Layout with Critical Components Only (Top View)
This layout only shows the critical components and top layer traces for minimum footprint in single-supply
mode with ENABLE tied to AVIN. Alternate circuit configurations & other low-power pins need to be connected
and routed according to customer application. Please see the Gerber files at http://www.intel.com/enpirion for
details on all layers.
Recommendation 1: Input and output filter capacitors should be placed on the same side of the PCB, and as
close to the EN6360QI package as possible. They should be connected to the device with very short and
wide traces. Do not use thermal reliefs or spokes when connecting the capacitor pads to the respective
nodes. The +V and GND traces between the capacitors and the EN6360QI should be as close to each other
as possible so that the gap between the two nodes is minimized, even under the capacitors.
Recommendation 2: The PGND connections for the input and output capacitors on layer 1 need to have a slit
between them in order to provide some separation between input and output current loops.
Recommendation 3: The system ground plane should be the first layer immediately below the surface layer.
This ground plane should be continuous and un-interrupted below the converter and the input/output
capacitors.
Recommendation 4: The thermal pad underneath the component must be connected to the system ground
plane through as many vias as possible. The drill diameter of the vias should be 0.33mm, and the vias must
have at least 1 oz. copper plating on the inside wall, making the finished hole size around 0.20-0.26mm. Do
not use thermal reliefs or spokes to connect the vias to the ground plane. This connection provides the path
for heat dissipation from the converter.
Recommendation 5: Multiple small vias (the same size as the thermal vias discussed in recommendation 4)
should be used to connect ground terminal of the input capacitor and output capacitors to the system ground
plane. It is preferred to put these vias along the edge of the GND copper closest to the +V copper. These vias
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connect the input/output filter capacitors to the GND plane, and help reduce parasitic inductances in the input
and output current loops.
Recommendation 6: AVIN is the power supply for the small-signal control circuits. It should be connected to
the input voltage at a quiet point. In Figure 10 this connection is made at the input capacitor.
Recommendation 7: The layer 1 metal under the device must not be more than shown in Figure 10. Refer to
the section regarding Exposed Metal on Bottom of Package. As with any switch-mode DC/DC converter, try
not to run sensitive signal or control lines underneath the converter package on other layers.
Recommendation 8: The VOUT sense point should be just after the last output filter capacitor. Keep the sense
trace short in order to avoid noise coupling into the node.
Recommendation 9: Keep RA, CA, RB, and R1 close to the VFB pin (Refer to Figure 10). The VFB pin is a high-
impedance, sensitive node. Keep the trace to this pin as short as possible. Whenever possible, connect RB
directly to the AGND pin instead of going through the GND plane.
Recommendation 10: Follow all the layout recommendations as close as possible to optimize performance.
Not following layout recommendations can complicate designs and create anomalies different than the
expected operation of the product.
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DESIGN CONSIDERATIONS FOR LEAD-FRAME BASED MODULES
Exposed Metal on Bottom of Package
Lead-frames offer many advantages in thermal performance, in reduced electrical lead resistance, and in
overall foot print. However, they do require some special considerations.
In the assembly process lead frame construction requires that, for mechanical support, some of the lead-frame
cantilevers be exposed at the point where wire-bond or internal passives are attached. This results in several
small pads being exposed on the bottom of the package, as shown in Figure 11.
Only the thermal pad and the perimeter pads are to be mechanically or electrically connected to the PC board.
The PCB top layer under the EN6360QI should be clear of any metal (copper pours, traces, or vias) except for
the thermal pad. The “shaded-out” area in Figure 11 represents the area that should be clear of any metal on
the top layer of the PCB. Any layer 1 metal under the shaded-out area runs the risk of undesirable shorted
connections even if it is covered by soldermask.
The solder stencil aperture should be smaller than the PCB ground pad. This will prevent excess solder from
causing bridging between adjacent pins or other exposed metal under the package. Please consult EN6360QI
Application Notes - Soldering Guidelines for more details and recommendations.
Figure 11: Lead-Frame exposed metal (Bottom View)
Shaded area highlights exposed metal that is not to be mechanically or electrically connected to the PCB.
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Figure 12: EN6360QI PCB Footprint (Top View)
The solder stencil aperture for the thermal pad is shown in blue and is based on Enpirion power product manufacturing
specifications.
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Datasheet | Intel® Enpirion® Power Solutions: EN6360QI
WHERE TO GET MORE INFORMATION
For more information about Intel® and Enpirion® PowerSoCs, visit:
www.intel.com/enpirion
© 2017 Intel Corporation. All rights reserved. Intel, the Intel logo, Altera, ARRIA, CYCLONE, ENPIRION, MAX, MEGACORE, NIOS, QUARTUS, and STRATIX words and logos are trademarks of Intel
Corporation or its subsidiaries in the U.S. and/or other countries. Other marks and brands may be claimed as the property of others. Intel reserves the right to make changes to any products and
services at any time without notice. Intel assumes no responsibility or liability arising out of the application or use of any information, product, or service described herein except as expressly agreed to
in writing by Intel. Intel customers are advised to obtain the latest version of device specifications before relying on any published information and before placing orders for products or services.
* Other marks and brands may be claimed as the property of others.
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REVISION HISTORY
Rev
Date
Change(s)
H
May, 2018
Changed datasheet into Intel format.
Updated EMI Horizontal and Vertical graphs.
I
Dec, 2018
Updated EN6360QI Package
J
Oct, 2019
Corrected Package Top Marking
06489 October 16, 2019 Rev J
