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Copyright © 2015-2017 Active-Semi, Inc.
FEATURES
Quick Charge™ 2.0 Certified by Qualcomm®
and UL.
UL Certificate No. 4787083099-1
http://www.qualcomm.com/documents/quickc
harge-device-list
Pass Apple MFi Test
40V Input Voltage Surge
4.5V-36V Operational Input Voltage
5.1V/9.1V/12.1V Output with +/-1% Accuracy
Up to 3.0A Output current
Constant Current Regulation Limit
QC2.0 Decoding + USB Auto-Detect + USB-PD
Type-C Support
Support Apple 2.4A, Samsung and BC1.2
Hiccup Mode Protection at Output Short
>90% Efficiency at Full Load
0.5mA Low Standby Input Current
5.7V/10.1V/13.5V Output Over-voltage
Protection for 5.1V/9.1V/12.1V Outputs
Cord Voltage Compensation
Meet EN55022 Class B Radiated EMI Standard
8kV ESD HBM Protection on DP and DM
SOP-8EP Package
APPLICATIONS
Car Charger
Cigarette Lighter Adaptor (CLA)
Rechargeable Portable Device
CV/CC regulation DC/DC converter
GENERAL DESCRIPTION
ACT4529 is a wide input voltage, high efficiency
step-down DC/DC converter that operates in either
CV (Constant Output Voltage) mode or CC
(Constant Output Current) mode. This device has
QC2.0 built in to provide 5.1V/9.1V/12.1V outputs
as requested by attached portable devices. Besides
building in QC2.0 decoding, it also supports Apple,
Samsung and BC1.2 devices to charge at full
current rate. ACT4529 has an interface for USB-PD
control via a tri-state digital pin. Vout is 5.1V if this
pin is floating, Vout is 9.1V when this pin voltage is
less than 0.8V and Vout is 12.1V while this pin
voltage is more than 2.0V.
ACT4529 has accurate output current limits under
constant current regulation to meet MFi
specification. It provides up to 3.0A output current
at 125kHz switching frequency. ACT4529 utilizes
adaptive drive technique to achieve good EMI
performance while main >90% efficiency at full load
for mini size CLA designs. It also has output short
circuit protection with hiccup mode. The average
output current is reduced to below 6mA when
output is shorted to ground. Other features include
output over voltage protection and thermal
shutdown.
This device is available in a SOP-8EP package and
require very few external components for operation.
ACT4529
40V/3.0A CV/CC Buck Converter Featuring QC2.0, USB Auto-Detect and USB-PD
Rev 4, 06-Jan-2017
Typical Application Circuit V/I Profile
ACT4529
HSB
IN SW
4.5V to 40V
DM
Rcs
20mÙ
CSP
DP
Vout
GND
D-
D+
GND
CSN
5V/9V/12V
C2
10ìF
C3
22nF
C5
220ìF
C1
47ìF
C4
22ìF
C6
2.2ìF
D1
SK54L
L1
40ìH
PDC
USB-PD Controller
I/O CC1 CC2
CC1
CC2
3.3A
5.1V
Vout
Iout
3.2V
9.1V
12.1V
* Patent Pending
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
ORDERING INFORMATION
PIN CONFIGURATION
8
7
6
5
1
2
3
4
CSP
CSN
GND
DP
IN
DM
SW
HSB
EP
ACT4529
SOP-8EP
PDC
Top View
PART NUMBER PDC QC2.0 CERTIFICATION PACKAGE
ACT4529YH-T0001 Yes No MFi SOP-8EP
ACT4529YH-T0010 Yes Yes QC 2.0 SOP-8EP
ACT4529YH-T0011 Yes Yes N/A SOP-8EP
USB AUTO
DETECT
Yes
No
Yes
ACT4529YH-T1011 Yes Yes Yes N/A SOP-8EP
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
ABSOLUTE MAXIMUM RATINGS
PARAMETER VALUE UNIT
IN to GND -0.3 to 40 V
SW to GND -1 to VIN +1 V
HSB to GND VSW - 0.3 to VSW + 7 V
CSP, CSN to GND -0.3 to +15 V
Junction to Ambient Thermal Resistance 46 °C/W
Operating Junction Temperature -40 to 150 °C
Storage Junction Temperature -55 to 150 °C
Lead Temperature (Soldering 10 sec.) 300 °C
All other pins to GND -0.3 to +6 V
PDC to GND -0.3 to +6 V
: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1 CSP Voltage Feedback Input. Connect to node of the inductor and output capacitor. CSP
and CSN Kevin sense is recommended.
2 CSN Negative input terminal of output current sense. Connect to the negative terminal of
current sense resistor.
3 PDC USB-PD Control Pin. floating: 5.1V, pulled high: 12.1V, pulled low: 9.1V. Do not drive
this pin higher than 5V.
4 DP Data Line Positive Input. Connected to D+ of attached portable device data line. This
pin passes 8kV HBM ESD.
5 DM Data Line Negative Input. Connected to D- of attached portable device data line. This
pin passes 8kV HBM ESD.
6 IN Power Supply Input. Bypass this pin with a 10ìF ceramic capacitor to GND, placed as
close to the IC as possible.
7 SW Power Switching Output to External Inductor.
8 HSB High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
Connect a 22nF capacitor from HSB pin to SW pin.
9 GND Ground and Heat Dissipation Pad. Connect this exposed pad to large ground copper
area with copper and vias.
ACT4529
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Copyright © 2015-2017 Active-Semi, Inc.
Parameter Symbol Condition Min Typ Max Unit
s
Input Over Voltage Protection VIN_OVP Rising 40 42 44 V
Input Over Voltage Hysteresis 4 V
Input Over Voltage Response Time T_VIN_OVP VIN step from 30V to 45V 250 ns
Input Under Voltage Lockout (UVLO) VIN Rising 4.5 V
Input UVLO Hysteresis 200 mV
Input Voltage Power Good Deglitch
Time No OVP 40 ms
Input Voltage Power Good Deglitch
Time No UVP 10 us
Input Standby Current Vin=12V, Vout=5.1V, Iload=0 500 uA
Output Voltage Regulation CSP
5.05
9.0
11.95
5.1
9.1
12.1
5.15
9.2
12.25
V
Output Over Voltage Protection
(OVP) Output rising
5.7
10.1
13.5
V
Input Brownout Protection
(ACT4529YH-T1011 only)
VIN Drop
Threshold
Falling Threshold 7.7 8.0 8.3 V
Hysteresis 200 mV
Vout Drop Delay Time 416 480 ms
QC and PDC Restart time 416 480 ms
Output Over Voltage Deglitch Time 1.0 us
Output Voltage Cord Compensation
ACT4529YH-
T0001
66mV between CSP and CSN
-15% 100 +15% mV
ACT4529YH-
T0010 -15% 200 +15% mV
ACT4529YH-
T0011 -15% 200 +15% mV
ACT4529YH-
T1011 -15% 200 +15% mV
Output Under Voltage Protection
(UVP) VOUT VOUT falling -10% 3.2 10% V
UVP Hysteresis VOUT VOUT rising 0.2 V
UVP Deglitch Time VOUT 10 us
UVP Blanking Time at Startup 3.5 ms
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
Parameter Symbol Condition Min Typ Max Units
Output Constant Current Limit Rcs=20mÙ 3.1 3.3 3.5 A
Hiccup Waiting Time 4.13 S
Top FET Cycle by Cycle Current
Limit 4.5 5.8 A
Top FET Rds on 70 mÙ
Bot FET Rds on 4.7 Ù
Maximum Duty Cycle 99 %
Switching Frequency -10% 125 +10% kHz
Soft-start Time 2.0 ms
Out Voltage Ripples Cout=220uF/22uF ceramic 80 mV
VOUT Discharge Current For high to lower voltage transi-
tions 60 mA
Voltage transition time for QC 2.0
transition or USB PD Type C 12V-5V 100 ms
Voltage transition time for QC 2.0
transition or USB PD Type C 5V-12V 100 ms
Line Transient Response Input 12V-40V-12V with 1V/us
slew rate, Vout=5V, Iload=0A
and 2.4A 4.75 5.25 V
Load Transient Response
Vout=5V 80mA-1.0A-80mA load with
0.1A/us slew rate 4.9 5.15 5.4 V
Vout=9V 80mA-1.0A-80mA load with
0.1A/us slew rate 8.7 9.1 9.5 V
Vout=12V 80mA-1.0A-80mA load with
0.1A/us slew rate 11.6 12.1 12.6 V
Thermal Shut Down 160 °C
Thermal Shut Down Hysteresis 30 °C
ESD of DP, DM HBM 8 kV
PDC Floating 1.5 V
PDC High 2.0 V
PDC Low 0.8 V
PDC Maximum Voltage 5.5 V
PDC Drive Current 10 uA
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA = 25°C, unless otherwise specified.)
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
FUNCTIONAL BLOCK DIAGRAM
PWM
Controller
Driver
Current Sense
and Control
70mΩ
4.7Ω
OVP
CSP CSN GND
SW
HSB
UVLO
VIN
DP
DM
QC2.0
Detect
USB
Auto
Detect
PDC
FUNCTIONAL DESCRIPTION
Output Current Sensing and Regulation
Sense resistor is connected to CSP and CSN. The
sensed differential voltage is compared with interval
reference to regulate current. CC loop and CV loop
are in parallel. The current loop response is allowed
to have slower response compared to voltage loop.
However, during current transient response, the
inductor current overshoot/undershoot should be
controlled within +/-25% to avoid inductor
saturation.
Cycle-by-Cycle Current Control
The conventional cycle-by-cycle peak current mode
is implemented with high-side FET current sense.
Input Over Voltage Protection
The converter is disabled if the input voltage is
above 42V (+/-2V). Device resumes operation
automatically 40ms after OVP is cleared.
Output Over Voltage Protection
Device stops switching when output over-voltage is
sensed, and resumes operation automatically when
output voltage drops to OVP- hysteresis.
Output Over Voltage Discharge
Discharge circuit starts to discharge output through
CSP pins when output over voltage is detected.
Discharge circuit brings 12V down to 5V in less
than 100ms.
Output Under-Voltage Protection /
Hiccup Mode
There is a under voltage protection (UVP)
threshold. If the UVP threshold is hit for 10us, an
over current or short circuit is assumed, and the
converter goes into hiccup mode by disabling the
converter and restarts after hiccup waiting period.
Input Brownout Protection
(ACT4529YH-T1011 only)
If the input voltage drops below 8V but higher than
UVLO for 450ms while in QC or PDC mode, the
output voltage turns off and QC or PDC mode is
disabled. If the output voltage drops below 3.7V, the
timer restarts and waits for 450ms before
attempting to restart the output voltage. When
output voltage rises above 3.9V and detects the
input voltage below 8V, timer restarts. If the input
voltage is below 8V after 450ms, the output turns
off. The cycle continues until the input voltage
increases above 8.2V,for longer than 450ms, then
output turns on, the IC renegotiates the PD and QC
protocols, and normal operation restarts.
Thermal Shutdown
If the TJ increases beyond 160°C, ACT4529 goes
into HZ mode and the timer is preserved until TJ
drops by 30°C.
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
Cord Compensation
In some applications, the output voltage is increased
with output current to compensate the potential
voltage drop across output cable. The compensation
is based on the high side feedback resistance.
The compensation voltage is derived as:
ÄVout = (VCSP-VCSN)*K
Where K=3.03
This voltage difference could be added on the
reference or turning the (VCSP-VCSN) voltage into a
sink current at FB pin to pull Vout higher than
programmed voltage.
The cord compensation loop should be very slow to
avoid potential disturbance to the voltage loop. The
voltage loop should be sufficiently stable on various
cord compensation setting.
FUNCTIONAL DESCRIPTION
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
APPLICATIONS INFORMATION
Inductor Selection
The inductor maintains a continuous current to the
output load. This inductor current has a ripple that is
dependent on the inductance value.
Higher inductance reduces the peak-to-peak ripple
current. The trade off for high inductance value is
the increase in inductor core size and series
resistance, and the reduction in current handling
capability. In general, select an inductance value L
based on ripple current requirement:
Where VIN is the input voltage, VOUT is the output
voltage, fSW is the switching frequency, ILOADMAX is
the maximum load current, and KRIPPLE is the ripple
factor. Typically, choose KRIPPLE = 30% to
correspond to the peak-to-peak ripple current being
30% of the maximum load current.
With a selected inductor value the peak-to-peak
inductor current is estimated as:
The peak inductor current is estimated as:
The selected inductor should not saturate at ILPK.
The maximum output current is calculated as:
LLIM is the internal current limit.
Input Capacitor
The input capacitor needs to be carefully selected
to maintain sufficiently low ripple at the supply input
of the converter. A low ESR capacitor is highly
recommended. Since large current flows in and out
of this capacitor during switching, its ESR also
affects efficiency.
The input capacitance needs to be higher than
10µF. The best choice is the ceramic type.
However, low ESR tantalum or electrolytic types
may also be used provided that the RMS ripple
current rating is higher than 50% of the output
current. The input capacitor should be placed close
to the IN and GND pins of the IC, with the shortest
traces possible. In the case of tantalum or
electrolytic types, a ceramic capacitor is
recommended to parallel with tantalum or
electrolytic capacitor, which should be placed right
next to the IC.
Output Capacitor
The output capacitor also needs to have low ESR to
keep low output voltage ripple. The output ripple
voltage is:
Where IOUTMAX is the maximum output current,
KRIPPLE is the ripple factor, RESR is the ESR of the
output capacitor, fSW is the switching frequency, L is
the inductor value, and COUT is the output
capacitance. From the equation above, VRIPPLE is the
combination of ESR and real capacitance.
In the case of ceramic output capacitors, RESR is very
small and does not contribute to the ripple.
Therefore, a lower capacitance value can be used
for ceramic type. In the case of tantalum or
electrolytic capacitors, the ripple is dominated by
RESR multiplied by the ripple current. In that case, the
output capacitor is chosen to have sufficiently low
ESR.
For ceramic output capacitor, typically choose a
capacitance of about 22µF. For tantalum or
electrolytic capacitors, choose a capacitor with less
than 50mÙ ESR. If an 330uF or 470uF electrolytic
cap or tantalum cap is used, where ripple is
dominantly caused by ESR, an 2.2uF ceramic in
parallel is recommended.
Rectifier Schottky Diode
Use a Schottky diode as the rectifier to conduct
current when the High-Side Power Switch is off.
The Schottky diode must have current rating higher
than the maximum output current and a reverse
voltage rating higher than the maximum input
voltage. Further more, the low forward voltage
Schottky is preferable for high efficiency and
smoothly operation.
(1)
(
)
RIPPLELOADMAXSWIN
OUTINOUT KIfV VVV
L_
×
=
(2)
(
)
SWIN
OUTINOUT
PKLPK fVL VVV
I××
×
=_
_
PKLPK
LOADMAXLPK
_
I
2
1
II +=
(3)
(4)
PKLPK
LIMOUTMAX
I
2
1
II
_
_
=
(5)
INOUTSW
OUTOUTIN
ESRRIPPLEOUTMAXRIPPLE VLCf
VVV
RKIV
2
8
)(
ACT4529
Rev 4, 06-Jan-2017
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Copyright © 2015-2017 Active-Semi, Inc.
Current Sense Resistor
The traces leading to and from the sense resistor
can be significant error sources. With small value
sense resistors, trace resistance shared with the
load can cause significant errors. It is recommended
to connect the sense resistor pads directly to the
CSP and CSN pins using “Kelvin” or “4-wire”
connection techniques as shown below.
Current Limit Setting
If output current hits current limit, output voltage
drops to keep the current to a constant value.
The following equation calculates the constant
current limit.
Where Rcs is current sense resistor.
PCB Load
Trace
Kevin Sense
Traces
Sense
Resistor
)(
66
)(
mRcs mV
AILimit
ACT4529
APPLICATIONS INFORMATION
(6)
ACT4529
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Copyright © 2015-2017 Active-Semi, Inc.
APPLICATIONS INFORMATION
PCB Layout Guidance
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
1) Arrange the power components to reduce the
AC loop size consisting of CIN, VIN pin, SW pin
and the Schottky diode.
2) The high power loss components, e.g. the
controller, Schottky diode, and the inductor
should be placed carefully to make the thermal
spread evenly on the board.
3) Place input decoupling ceramic capacitor CIN as
close to VIN pin as possible. CIN should be
connected to power GND with several vias or
short and wide copper trace.
4) Schottky anode pad and IC exposed pad
should be placed close to ground clips in CLA
applications
5) Use “Kelvin” or “4-wire” connection techniques
from the sense resistor pads directly to the CSP
and CSN pins. The CSP and CSN traces
should be in parallel to avoid interference.
6) Place multiple vias between top and bottom
GND planes for best heat dissipation and noise
immunity.
7) Use short traces connecting HSB-CHSB-SW
loop.
8) SW pad is noise node switching from VIN to
GND. It should be isolated away from the rest
of circuit for good EMI and low noise operation.
Example PCB Layout
ACT4529
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Copyright © 2015-2017 Active-Semi, Inc.
BOM List for 2.4A Car Charger
ITEM REFERENCE DESCRIPTION MANUFACTURER QTY
1 U1 IC, ACT4529, SOP-8EP Active-Semi 1
2 C1 Capacitor, Electrolytic, 47µF/35V Murata, TDK 1
3 C2 Capacitor, Ceramic, 10µF/25V, 1206, SMD Murata, TDK 1
4 C3 Capacitor, Ceramic, 22nF/25V, 0603, SMD Murata, TDK 1
5 C4 Capacitor, Ceramic, 22µF/16V, 1206, SMD Murata, TDK 1
6 C5 Capacitor, Electrolytic, 220µF/16V Murata, TDK 1
7 C6 Capacitor, Ceramic, 2.2µF/16V, 0805, SMD Murata, TDK 1
8 L1 Inductor, 40µH, 4A, 20% 1
9 D1 Diode, Schottky, 40V/5A, SK54L Panjit 1
10 Rcs Chip Resistor, 20mΩ, 1206, 1% Murata, TDK 1
Typical Application Circuit
U1
ACT4529
HSB
IN SW
4.5V to 40V
DM
Rcs
20mÙ
CSP
DP
Vout
GND
D-
D+
GND
CSN
5V/9V/12V
C2
10ìF
C3
22nF
C5
220ìF
C1
47ìF
C4
22ìF
C6
2.2ìF
D1
SK54L
L1
40ìH
PDC
USB-PD Controller
I/O CC1 CC2
CC1
CC2
ACT4529
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Copyright © 2015-2017 Active-Semi, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified)
Efficiency (%)
100
85
80
75
70
65
60
95
90
Efficiency vs. Load current ( 5V Vout)
ACT4529-001
VIN =12V
VIN =24V
Efficiency(%)
VIN =24V
ACT4529-002
VIN =12V
0 500 1000 1500 2000 2500 3000
Load Current (mA)
100
85
80
75
70
65
60
95
90
Efficiency vs. Load current ( 9V Vout)
0 500 1000 1500 2000 2500 3000
Load Current (mA)
Efficiency (%)
100
85
80
75
70
65
60
95
90
Efficiency vs. Load current ( 12V Vout)
ACT4529-003
VIN =24V VIN =12V
Output CC/CV Curve (5V Vout)
Output Voltage (V)
6.0
5.0
4.0
3.0
2.0
1.0
0
VIN =24V VIN =12V
ACT4529-004
Output CC/CV Curve (9V Vout)
Output Voltage (V)
10.0
8.0
6.0
4.0
2.0
0
ACT4529-005
Output CC/CV Curve (12V Vout)
Output Voltage (V)
12.0
10.0
8.0
6.0
4.0
2.0
0
14.0
VIN =24V VIN =12V
ACT4529-006
VIN =24V
VIN =12V
0 500 1000 1500 2000 2500 3000
Load Current (mA)
0 5000 1000 1500 2000 2500 3000 3500
Output Current (mA)
0 5000 1000 1500 2000 2500 3000 3500
Output Current (mA)
0 5000 1000 1500 2000 2500 3000 3500
Output Current (mA)
ACT4529
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Copyright © 2015-2017 Active-Semi, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified)
Load Transient (80mA-1A-80mA)
Vin=12V, Vout=5V
ACT4529-009
CH1: VOUT, 100mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
CH1
CH2
Load Transient (1A-2.4A-1A)
Vin=12V, Vout=5V
ACT4529-010
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
CH1
CH2
Load Transient (80mA-1A-80mA)
Vin=12.6V, Vout=12V
ACT4529-011
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
CH1
CH2
Load Transient (1A-2.4A-1A)
Vin=12.6V, Vout=12V
ACT4529-012
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 400us//div
CH1
CH2
Start up into CC Mode
ACT4529-008
VOUT = 5.1V
RLORD = 1.5Ù
IOUT = 2.65A
VIN = 12V
CH1: VIN, 10V/div
CH2: VOUT, 2V/div
CH3: IOUT, 2A/div
TIME: 400µs/div
CH1
CH2
CH3
Output Over Voltage (5V Vout)
ACT4529-007
CH1: VOUT, 1V/div
CH2: SW, 10V/div
TIME: 1ms/div
CH1
CH2
ACT4529
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TYPICAL PERFORMANCE CHARACTERISTICS
(Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified)
Voltage Transient (5V-9V)
ACT4529-013
CH1: VOUT, 2V/div
TIME: 10ms//div
CH1
Voltage Transient (9V-5V)
ACT4529-014
CH1: VOUT, 2V/div
TIME: 10ms//div
CH1
Voltage Transient (5V-12V)
ACT4529-015
CH1: VOUT, 2V/div
TIME: 10ms//div
CH1
Voltage Transient (12V-5V)
ACT4529-016
CH1: VOUT, 2V/div
TIME: 10ms//div
CH1
ACT4529
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Copyright © 2015-2017 Active-Semi, Inc.
PACKAGE OUTLINE
SOP-8EP PACKAGE OUTLINE AND DIMENSIONS
Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each
product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use
as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of
the use of any product or circuit described in this datasheet, nor does it convey any patent license.
Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact
sales@active-semi.com or visit http://www.active-semi.com.
is a registered trademark of Active-Semi.
SYMBOL DIMENSION IN
MILLIMETERS DIMENSION IN
INCHES
MIN MAX MIN MAX
A 1.350 1.727 0.053 0.068
A1 0.000 0.152 0.000 0.006
A2 1.245 1.550 0.049 0.061
b 0.330 0.510 0.013 0.020
c 0.170 0.250 0.007 0.010
D 4.700 5.100 0.185 0.200
D1 3.202 3.402 0.126 0.134
E 3.734 4.000 0.147 0.157
E1 5.800 6.200 0.228 0.244
E2 2.313 2.513 0.091 0.099
e 1.270 TYP 0.050 TYP
L 0.400 1.270 0.016 0.050
è 0° 8° 0° 8°
