ACT4525
Rev 3, 06-Jan-2017
40V/3.5A CV/CC Buck Converter with USB Auto
–Detect
FEATURES
Pass Apple MFi Test
40V Input Voltage Surge
4.5V-36V Operational Input Voltage
Dual 5.1V Outputs with 1% Accuracy
Up to 3.5A Output Current
2.65A Constant Current Regulation for VOUT1
1.2A Constant Current Regulation for VOUT2
USB Auto-detect Support Apple 2.4A, Samsung
and BC1.2 Devices
Hiccup Mode Protection at Output Short
90% Efficiency at Full Load
0.5mA Low Standby Input Current
5.7V Output Over Voltage Protection
Cord Voltage Drop Compensation
Meet EN55022 Class B Radiated EMI Standard
8kV ESD HBM Protection on DP and DM
SOP-8EP Package
GENERAL DESCRIPTION
ACT4525 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. ACT4525 has
separated output current limits for dual port CLA
applications. With the separated current limits, the
CLA can meet Apple’s
MFi standard. ACT4525
provides up to 3.5A output current at 125kHz
switching frequency. ACT4525 builds in USB auto-
detect algorithms to recognize Apple, Samsung,
and BC1.2 devices to ensure maximum charge
current to attached devices. ACT4525 utilize
adaptive drive technique to achieve good EMI
performance while main 90% efficiency at full load
for mini size CLA designs. ACT4525 also built in
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.
The devices are available in a SOP-8EP package
and require very few external devices for operation.
APPLICATIONS
Car Charger
Cigarette Lighter Adaptor (CLA)
Rechargeable Portable Device
CV/CC regulation DC/DC converter
Typical Application Circuit
V/I Profile
4.5V to 40V
C3
22nF
CSN2
SW
IN
CSN1
HSB
Rcs2
50mÙ
ACT4525
CSP
5.1V/2.4A
L1
33ìH
C4
C5
10ìF 470ìF
Rcs1
25mÙ
Vout
5.1V/1A
Vout
C1
47ìF
C2
10ìF
GND
DP
DM
C6
2.2ìF
D-
D+
GND
C7
2.2ìF
D-
D+
GND
D1
SK54L
* Patent Pending
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Copyright
© 2016-2017
Active-Semi, Inc.
ACT4525
Rev 3, 06-Jan-2017
ORDERING INFORMATION
PART NUMBER
ACT4525YH-T
ACT4525YH-T0001
OPERATION
TEMPERATURE PACKAGE
RANGE
-40°C
to 85°C
-40°C
to 85°C
SOP-8EP
SOP-8EP
FREQUENCY
125kHz
125kHz
CORD
COMP
100mV
200mV
PACKING
TAPE & REEL
TAPE & REEL
PIN CONFIGURATION
Top View
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Copyright
© 2016-2017
Active-Semi, Inc.
ACT4525
Rev 3, 06-Jan-2017
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
9
NAME
CSP
CSN1
CSN2
DP
DM
IN
SW
HSB
GND
DESCRIPTION
Voltage Feedback Input. Connect to node of the inductor and output capacitor. CSP,
CSN1 and CSN2 Kevin sensing is recommended.
Output current sense negative input. Connect to the negative terminal of current
sense resistor for VOUT1.
Output current sense negative input. Connect to the negative terminal of current
sense resistor for VOUT2.
Data Line Positive Input. Connected to D+ of attached portable device data line.
This pin passes 8kV HBM ESD.
Data Line Negative Input. Connected to D- of attached portable device data line.
This pin passes 8kV HBM ESD.
Power Supply Input. Bypass this pin with a 10ìF ceramic capacitor to GND, placed
as close to the IC as possible.
Power Switching Output to External Inductor.
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.
Ground and Heat Dissipation Pad. Connect this exposed pad to large ground
copper area with copper and vias.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
IN to GND
SW to GND
HSB to GND
CSP, CSN1, CSN2, DP , DM to GND
Junction to Ambient Thermal Resistance
Operating Junction Temperature
Storage Junction Temperature
Lead Temperature (Soldering 10 sec.)
VALUE
-0.3 to 40
-1 to V
IN
+1
V
SW
- 0.3 to V
SW
+ 7
-0.3 to +6
46
UNIT
V
V
V
V
°C/W
-40 to 150
°C
-55 to 150
°C
300
°C
:
Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
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Copyright
© 2016-2017
Active-Semi, Inc.
ACT4525
Rev 3, 06-Jan-2017
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, T
A
= 25°C,
unless otherwise specified.)
Parameter
Input Over Voltage Protection
Input Over Voltage Hysteresis
Input Over Voltage Response Time
Input Under Voltage Lockout (UVLO)
Input UVLO Hysteresis
Input Voltage Power Good Deglitch
Time
Input Voltage Power Good Deglitch
Time
Input Standby Current
Output Voltage Regulation
Output Over Voltage Protection
(OVP)
Output Over Voltage Deglitch Time
Symbol
VIN_OVP
Rising
Condition
Min
40
Typ
42
4
Max
44
Units
V
V
ns
V
mV
ms
us
uA
T_VIN_OVP VIN step from 30V to 45V
VIN
Rising
250
4.5
200
No OVP
No UVP
Vin=12V, Vout=5.1V, Iload=0
CSP
Output rising
5.05
40
10
500
5.1
5.7
1.0
5.15
V
V
us
ACT4525-T Iout=2.4A
Output Voltage Cord Compensation
ACT4525-T0001 Iout=2.4A
Output Under Voltage Protection
(UVP)
UVP Hysteresis
UVP Deglitch Time
UVP Blanking Time at Startup
CC1
Output Constant Current Limit
CC2
Hiccup Waiting Time
Top FET Cycle by Cycle Current
Limit
Top FET Rdson
Bottom FET Rdson
Maximum Duty Cycle
Switching Frequency
Soft-start Time
Innovative Power
TM
-15%
-15%
-10%
100
200
3.2
0.2
10
3.5
+15%
+15%
10%
mV
mV
V
V
us
ms
VOUT
VOUT
VOUT
VOUT falling
VOUT rising
Rcs=25mÙ
Rcs=50mÙ
2.50
1.1
2.65
1.2
4.13
2.80
1.3
A
A
s
A
mΩ
Ω
4.5
5.8
70
4.7
99
-10%
125
2.0
+10%
%
kHz
ms
-4-
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Copyright
© 2016-2017
Active-Semi, Inc.
ACT4525
Rev 3, 06-Jan-2017
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, T
A
= 25°C,
unless otherwise specified.)
Parameter
Out Voltage Ripples
Symbol
Condition
Cout=470uF/22uF ceramic
Input 12V-40V-12V with 1V/us
slew rate, Vout=5V, Iload=0A
and 2.4A
80mA-1.0A-80mA load with
0.1A/us slew rate
Min
Typ
80
Max
Units
mV
Line Transient Response
4.75
5.25
V
Load Transient Response
Thermal Shut Down
Thermal Shut Down Hysteresis
ESD of DP, DM
Vout=5V
4.9
5.15
160
5.4
V
°C
30
°C
HBM
8
kV
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Copyright
© 2016-2017
Active-Semi, Inc.
