MIC5310
Dual 150mA µCap LDO in 2mm x 2mm MLF®
ULDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
General Description
The MIC5310 is a tiny Dual Ultra Low Dropout
(ULDO™) linear regulator ideally suited for portable
electronics due to its high power supply ripple
rejection (PSRR) and ultra low output noise. The
MIC5310 integrates two high-performance 150mA
ULDOs into a tiny 2mm x 2mm leadless MLF®
package, which provides exceptional thermal package
characteristics.
The MIC5310 is a µCap design which enables
operation with very small ceramic output capacitors
for stability, thereby reducing required board space
and component cost. The combination of extremely
low-drop-out voltage, high power supply rejection and
exceptional thermal package characteristics makes it
ideal for powering RF/noise sensitive circuitry, cellular
phone camera modules, imaging sensors for digital
still cameras, PDAs, MP3 players and WebCam
applications
The MIC5310 ULDO™ is available in fixed-output
voltages in the tiny 8-pin 2mm x 2mm leadless MLF®
package which occupies less than half the board area
of a single SOT-6 package. Additional voltage options
are available. For more information, contact Micrel
marketing department.
Data sheets and support documentation are found on
the Micrel web site www.micrel.com.
Features
• 2.3V to 5.5V input voltage range
• Ultra-low dropout voltage ULDO™ 35mV @ 150mA
• High PSRR - >70dB @ 1KHz
• Ultra-low output noise: 30µVRMS
• ±2% initial output accuracy
• Tiny 8-pin 2mm x 2mm MLF® leadless package
• Excellent Load/Line transient response
• Fast start up time: 30µs
• µCap stable with 1µF ceramic capacitor
• Thermal shutdown protection
• Low quiescent current: 75µA per output
• Current limit protection
Applications
• Mobile phones
• PDAs
• GPS receivers
• Portable electronics
• Portable media players
• Digital still and video cameras
Typical Application
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RF Power Supply Circuit
Block Diagram
MIC5310 Fixed Block Diagram
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Ordering Information
Functional
Part number
Ordering
Part Number
Marking1
VOUT1/VOUT22
Junction
Temperature Range
Package3
MIC5310-1.8/1.5YML MIC5310-GFYML GFZ 1.8V/1.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-1.8/1.8YML MIC5310-GGYML GGZ 1.8V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-1.8/1.6YML MIC5310-GWYML GWZ 1.8V/1.6V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.5/1.8YML MIC5310-JGYML JGZ 2.5V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.5/2.5YML MIC5310-JJYML JJZ 2.5V/2.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.6/1.85YML MIC5310-KDYML KDZ 2.6V/1.85 –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.6/1.8YML MIC5310-KGYML KGZ 2.6V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.7/2.7YML MIC5310-LLYML LLZ 2.7V/2.7V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.8/1.5YML MIC5310-MFYML MFZ 2.8V/1.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.8/1.8YML MIC5310-MGYML MGZ 2.8V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.8/2.6YML MIC5310-MKYML MKZ 2.8V/2.6V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.8/2.8YML MIC5310-MMYML MMZ 2.8V/2.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.85/1.85YML MIC5310-NDYML NDZ 2.85V/1.85V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.85/2.6YML MIC5310-NKYML NKZ 2.85V/2.6V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.85/2.85YML MIC5310-NNYML NNZ 2.85V/2.85V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.9/1.5YML MIC5310-OFYML OFZ 2.9V/1.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.9/1.8YML MIC5310-OGYML OGZ 2.9V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-2.9/2.9YML MIC5310-OOYML OOZ 2.9V/2.9V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.0/1.8YML MIC5310-PGYML PGZ 3.0V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.0/2.5YML MIC5310-PJYML PJZ 3.0V/2.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.0/2.6YML MIC5310-PKYML PKZ 3.0V/2.6V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.0/2.8YML MIC5310-PMYML PMZ 3.0V/2.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.0/2.85YML MIC5310-PNYML PNZ 3.0V/2.85V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.0/3.0YML MIC5310-PPYML PPZ 3.0V/3.0V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/1.5YML MIC5310-SFYML SFZ 3.3V/1.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/1.8YML MIC5310-SGYML SGZ 3.3V/1.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/2.5YML MIC5310-SJYML SJZ 3.3V/2.5V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/2.6YML MIC5310-SKYML SKZ 3.3V/2.6V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/2.8YML MIC5310-SMYML SMZ 3.3V/2.8V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/2.85YML MIC5310-SNYML SNZ 3.3V/2.85V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/2.9YML MIC5310-SOYML SOZ 3.3V/2.9V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/3.0YML MIC5310-SPYML SPZ 3.3V/3.0V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/3.2YML MIC5310-SRYML SRZ 3.3V/3.2V –40°C to +125°C 8-Pin 2x2 MLF®
MIC5310-3.3/3.3YML MIC5310-SSYML SSZ 3.3V/3.3V –40°C to +125°C 8-Pin 2x2 MLF®
Notes:
1. Over bar symbol ( ¯ ) may not be to scale. Over bar at Pin 1.
2. Other voltage options available. Contact Micrel for more details.
3. MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
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Pin Configuration
8-Pin 2mm x 2mm MLF (ML)
Top View
Pin Description
Pin Number Pin Name Pin Function
1 VIN Supply Input.
2 GND Ground
3 BYP
Reference Bypass: Connect external 0.1µF to GND to reduce output noise.
May be left open when bypass capacitor is not required.
4 EN2
Enable Input (regulator 2). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
5 EN1
Enable Input (regulator 1). Active High Input. Logic High = On; Logic Low = Off;
Do not leave floating.
6 NC Not internally connected
7 VOUT2 Regulator Output – LDO2
8 VOUT1 Regulator Output – LDO1
– EP Exposed Pad. Connect EP to GND.
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Absolute Maximum Ratings(1)
Supply Voltage (VIN).....................................0V to +6V
Enable Input Voltage (VEN)...........................0V to +6V
Power Dissipation...........................Internally Limited(3)
Lead Temperature (soldering, 3sec ...................260°C
Storage Temperature (TS)................. -65°C to +150°C
ESD Rating(4) .........................................................2kV
Operating Ratings(2)
Supply voltage (VIN)............................... +2.3V to +5.5V
Enable Input Voltage (VEN).............................. 0V to VIN
Junction Temperature ......................... -40°C to +125°C
Junction Thermal Resistance
MLF-8 (θJA) ............................................... 90°C/W
Electrical Characteristics(5)
VIN = EN1 = EN2 = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100µA; COUT1 = COUT2 = 1µF;
CBYP = 0.1µF; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Parameter Conditions Min Typ Max Units
Variation from nominal VOUT -2.0 +2.0 % Output Voltage Accuracy
Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 %
Line Regulation VIN = VOUT + 1V to 5.5V; IOUT = 100µA 0.02 0.3
0.6
%/V
%/V
Load Regulation IOUT = 100µA to 150mA 0.5 2.0 %
Dropout Voltage (Note 6) IOUT = 100µA
IOUT = 50mA
IOUT = 100mA
IOUT = 150mA
0.1
12
25
35
50
75
100
mV
mV
mV
mV
Ground Current EN1 = High; EN2 = Low; IOUT = 100µA to 150mA
EN1 = Low; EN2 = High; IOUT = 100µA to 150mA
EN1 = EN2 = High; IOUT1 = 150mA, IOUT2 = 150mA
85
85
150
120
120
190
µA
µA
µA
Ground Current in Shutdown EN1 = EN2 = 0V 0.01 2 µA
Ripple Rejection f = 1kHz; COUT = 1.0µF; CBYP = 0.1µF
f = 20kHz; COUT = 1.0µF; CBYP = 0.1µF
70
65
dB
dB
Current Limit VOUT = 0V 300 550 950 mA
Output Voltage Noise COUT = 1.0 µF; CBYP = 0.1µF; 10Hz to 100kHz 30 µVRMS
Enable Inputs (EN1 / EN2)
Logic Low 0.2 V Enable Input Voltage
Logic High 1.1 V
VIL ≤ 0.2V 0.01 µA Enable Input Current
VIH ≥ 1.0V 0.01 µA
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2) COUT = 1.0µF; CBYP = 0.01µF 30 100 µs
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
5. Specification for packaged product only.
6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below
2.3V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.3V.
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Typical Characteristics
MIC5310 - Output Noise
Spectral Density
0.001
0.01
0.1
1
10
10 100 1,000 10,000 100,00
0
1,000,0
00
10,000,
000
Frequency (Hz)
Noise uV/√Hz
V
in
=V
out
+1
C
out
=1uF
C
by p
=0.01u
F
V
t
=3V
Dropout Voltage
0
5
10
15
20
25
30
35
40
0 20 40 60 80 100 120 140
Iout (mA)
Dropout (mV)
V
in
=V
out
+1
V
out
=3V
C
out
=1uF
Ground Current vs. Temperature
70
72
74
76
78
80
82
84
86
88
90
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Ground Current (uA)
V
in
= V
out
+ 1V
EN1 = V
in
, EN2 =
GND
V
out
= 3V
C
out
= 1 uF
100 uA
50 mA
100 mA
150 mA
Output Voltage
2.7
2.75
2.8
2.85
2.9
2.95
3
3.05
3.1
3.15
3.2
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Output Voltage (V)
V
in
= V
out
+ 1V
V
in
= EN1 = EN2
V
out
= 3V
I
out
= 100 uA
C
out
= 1 uF
Output Voltage vs Output
Current
2.7
2.8
2.9
3
3.1
3.2
3.3
0 25 50 75 100 125 150
Output Current (mA)
Output Voltage (V)
V
in
=V
out
+1
V
out
=3V
C
out
=1uF
•
Dropout Characteristics
0
0.5
1
1.5
2
2.5
3
3.5
012345
Input Voltage (V)
Output Voltage (V)
6
C
out
=1uF
100uA
150mA
Dropout Voltage
0
10
20
30
40
50
-60 -40 -20 0 20 40 60 80 100 120 140
Temperature (°C)
Dropout Voltage (mV)
V
out
= 3 V
V
in
= V
out
+ 1 V
V
in
= EN1 = EN2
C
out
= 1 uF
100
mA
50 mA
10mA 100u
A
1
50 mA
Ground Current vs Output
Current
70
72
74
76
78
80
82
84
86
88
90
0 25 50 75 100 125 150
Output Current (mA)
Ground Current (uA)
V
out
=3V
V
in
=V
out
+1V
Ven1 =V
en2
=V
in
C
out1
=C
out2
=1uF
Current Limit vs. Input Voltage
400
420
440
460
480
500
520
540
560
580
600
2345
Input Voltage (V)
Current Limit (mA)
C
out
=1uF
V
en
=V
in
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Typical Characteristics (Continued)
Power Supply Rejection Ratio
-80
-70
-60
-50
-40
-30
-20
-10
0
10
100 1,000 10,000 100,000 1,000,000
Frequency (Hz)
dB
V
in
= 3.4V
V
out
=3V
C
out
=1uF
I
out
=50mA
C
byp
=0.1uF
Power Supply Rejection Ratio
-80
-70
-60
-50
-40
-30
-20
-10
0
10
100 1,000 10,000 100,000 1,000,000
Frequency (Hz)
dB
V
in
= 3.6V
V
out
=3V
C
out
=1uF
I
out
=150mA
C
by p
=0.1uF
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Functional Characteristics
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Applications Information
Enable/Shutdown
The MIC5310 comes with dual active-high enable pins
that allow each regulator to be enabled independently.
Forcing the enable pin low disables the regulator and
sends it into a “zero” off mode current state. In this
state, current consumed by the regulator goes nearly
to zero. Forcing the enable pin high enables the
output voltage. The active high enable pin uses
CMOS technology and the enable pin cannot be left
floating; a floating enable pin may cause an
indeterminate state on the output.
Input Capacitor
The MIC5310 is a high-performance, high bandwidth
device. Therefore, it requires a well bypassed input
supply for optimal performance. A 1µF capacitor is
required from the input to ground to provide stability.
Low ESR ceramic capacitors provide optimal
performance at a minimum of space. Additional high
frequency capacitors, such as small valued NPO
dielectric type capacitors, help filter out high frequency
noise and are good practice in any RF based circuit.
Output Capacitor
The MIC5310 requires an output capacitor of 1µF or
greater to maintain stability. The design is optimized
for use with low ESR ceramic chip capacitors. High
ESR capacitors may cause high frequency oscillation.
The output capacitor can be increased, but
performance has been optimized for a 1µF ceramic
output capacitor and does not improve significantly
with larger capacitance.
X7R/X5R dielectric type ceramic capacitors are
recommended because of their temperature
performance. X7R type capacitors change
capacitance by 15% over their operating temperature
range and are the most stable type of ceramic
capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% and 60%, respectively, over
their operating temperature ranges. To use a ceramic
chip capacitor with Y5V dielectric, the value must be
much higher than an X7R ceramic capacitor to ensure
the same minimum capacitance over the equivalent
operating temperature range.
Bypass Capacitor
A capacitor can be placed from the noise bypass pin
to ground to reduce output voltage noise. The
capacitor bypasses the internal reference. A 0.1µF
capacitor is recommended for applications that require
low-noise outputs. The bypass capacitor can be
increased, further reducing noise and improving
PSRR. Turn on time increases slightly with respect to
bypass capacitance. A unique, quick start circuit
allows the MIC5310 to drive a large capacitor on the
bypass pin without significantly slowing turn on time.
No-Load Stability
Unlike many other voltage regulators, the MIC5310
will remain stable and in regulation with no load. This
is especially important in CMOS RAM keep alive
applications.
Thermal Considerations
The MIC5310 is designed to provide 150mA of
continuous current for both outputs in a very small
package. Maximum ambient operating temperature
can be calculated based on the output current and the
voltage drop across the part. Given that the input
voltage is 3.3V, the output voltage is 2.8V for VOUT1,
1.5V for VOUT2 and the output current = 150mA. The
actual power dissipation of the regulator circuit can be
determined using the equation:
PD = (VIN – VOUT1) IOUT1 + (VIN – VOUT2) IOUT2+ VIN IGND
Because this device is CMOS and the ground current
is typically <100µA over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
PD = (3.3V – 2.8V) × 150mA + (3.3V -1.5) × 150mA
P
D = 0.345W
To determine the maximum ambient operating
temperature of the package, use the junction-to-
ambient thermal resistance of the device and the
following basic equation:
PD(MAX) = TJ(MAX) - TA
JA
⎝
⎛
TJ(max) = 125°C, the maximum junction temperature of
the die θJA thermal resistance = 90°C/W.
The table below shows junction-to-ambient thermal
resistance for the MIC5310 in different packages.
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Package JA Recommended
Minimum Footprint
8-Pin 2x2 MLF® 90°C/W
Thermal Resistance
Substituting PD for PD(max) and solving for the ambient
operating temperature will give the maximum
operating conditions for the regulator circuit. The
junction-to-ambient thermal resistance for the
minimum footprint is 90°C/W.
The maximum power dissipation must not be
exceeded for proper operation.
For example, when operating the MIC5310-MFYML at
an input voltage of 3.3V and 150mA loads at each
output with a minimum footprint layout, the maximum
ambient operating temperature TA can be determined
as follows:
0.345W = (125°C – TA)/(90°C/W)
T
A = 93.95°C
Therefore, a 2.8V/1.5V application with 150mA at
each output current can accept an ambient operating
temperature of 93.95°C in a 2mm x 2mm MLF®
package. For a full discussion of heat sinking and
thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing
with Low-Dropout Voltage Regulators handbook. This
information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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Package Information
8-Pin 2mm x 2mm MLF (ML)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical impla
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
can nt
© 2006 Micrel, Incorporated.
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