PSC5425E
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Description
The PSC5425E combines a highly integrated switch-mode charger, to minimize single-cell Lithium-ion (Li-ion) charging time
from a USB power source, and a boost regulator to power a USB peripheral from the battery.
The charging parameters and operating modes are programmable through an I C interface. The charger and boost regulator
circuits switch at select-able frequency to lower the EMI and minimize the size of external passive components.
The PSC5425E provides battery charging in three phases: conditioning, constant current, and constant voltage.
To ensure USB compliance and minimize charging time, the input current is limited to the value set through the I C host.
Charge termination current is programmable through the I C host.
The integrated circuit (IC) automatically restarts the charge cycle when the battery falls below an internal threshold. If the
input source is removed, the IC enters a high-impedance mode with leakage from the battery to the input prevented. Charge
status is reported back to the host through the I C port.
The PSC5425E can operate as a boost regulator on command from the system. The boost regulator includes a soft-start that
limits inrush current from the battery.
The PSC5425E is available in a 20-bump, 0.4mm pitch WLCSP package.
V
BUS
VBUS
L1
SW
C
CSIN
0.1μF
1μH
2
2
2
2
R
SNS
C
BAT
22μF
BATTERY
C
BUS
1μF
VAUX
10KΩ 10KΩ 10KΩ
4.7μF
PMID
C
MID
PSC5425E
SCL
SDA
STAT
OTG
DISABLE
CSIN
VBAT
VREF
PGND
C
REF
2.2μF
C
CSOUT
0.1μF
10KΩ
GPIO
10KΩ
HOST
Figure 1: Typical Application
Feature
Fully Integrated, High-Efficiency Charger for Single-Cell
Li-lon and Li-Polymer Battery Packs
Faster Charging than Linear
Charge Voltage Accuracy: ±
0.5% 25℃
±
5% Charge Current Regulation Accuracy
29V Absolute Maximum Input Voltage
6V Maximum Input Operating Voltage
2.25A Maximum Charge Rate
Application
Cellular Phones, Smart Phones, PDAs
Tablet, Portable Media Players
Gaming Device, Digital Cameras
Rev.06.1.4
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PSC5425E
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Programmable through I C Interface:
-Input Current
-Fast-Charge/Termination Current
-Charger Voltage
-Termination Enable
Synchronous Buck PWM Controller with Wide Duty Cycle
Range
Small Footprint 1μH External Inductor
Weak Input Sources Accommodated by Reducing
Charging Current to Maintain Minimum VBUS Voltage
Low Reverse Leakage to Prevent Battery Drain to VBUS
5V, 700mA Boost Mode for USB OTG for 3.3 to 4.5V
Battery Input
2
Recommended External Components
Key Components
L1
C
MID
C
REF
C
BUS
Recommended specification
Inductor, 1.0-2.2uH, +-20%, Isat>3A
Capacitor, 4.7μF, +-10%, >6V
Capacitor, 2.2-4.7μF, +-10%, >6V
Capacitor, 1μF, +-10%, >30V
Rev.06.1.4
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PSC5425E
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
Block Diagram
VBUS
Q3
LDO
OVP
(6.0V)
Charge
Pump
IN Current
Sensor
PMID
VREG
Q1
VREG
PWM
DRIVER
Q2
BIAS
SW
BUCK
BOOST Controller
DISABLE
OTG
STAT
SCL
SDA
PMID
30mA
GND
I2C
Digital
Timer
(90m/32s/12h)
VBAT
Figure 2: IC and System Block Diagram
Pin Configuration
A1
B1
C1
D1
E1
A2
B2
C2
D2
E2
A3
B3
C3
D3
E3
A4
B4
C4
D4
E4
A4
B4
C4
D4
E4
A3
B3
C3
D3
E3
A2
B2
C2
D2
E2
A1
B1
C1
D1
E1
Top View
Figure 3: WLCSP-20 Pin Assignments
Bottom View
Rev.06.1.4
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PSC5425E
USB-Compliant Single-Cell Li-lon Switching Charger with USB-OTG Boost Regulator
IMPORTANT NOTICE
and
are registered trademarks of
Prisemi Electronics Co., Ltd (Prisemi)
,Prisemi
reserves the right to make changes without further notice to any products herein. Prisemi makes
no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does Prisemi
assume any liability arising out of the application or use of any
product or circuit, and specifically disclaims any and all liability, including without limitation
special, consequential or incidental damages. “Typical” parameters which may be provided in
Prisemi data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. Prisemi does not
convey any license under its patent rights nor the rights of others. The products listed in this
document are designed to be used with ordinary electronic equipment or devices, Should you
intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical
instruments, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety
devices), please be sure to consult with our sales representative in advance.
Website: http://www.prisemi.com
For additional information, please contact your local Sales Representative.
©Copyright 2009, Prisemi Electronics
is a registered trademark of Prisemi Electronics.
All rights are reserved.
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