RT9527 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Single Cell Li-Ion Battery Charger with Adjustable Charging Current for Portable Applications

®
RT9527
Single Cell Li-Ion Battery Charger with Adjustable Charging
Current for Portable Applications
General Description
The RT9527 is a low cost single-cell Li-ion charger for low
current charge applications.
The RT9527 can be powered up from an AC adapter or
USB (Universal Serial Bus) port inputs. The RT9527 enters
sleep mode when VIN power is removed. The RT9527
optimizes the charging task by using a control algorithm,
which includes pre-charge mode, fast-charge mode and
constant voltage mode. The charging task is kept in
constant voltage mode to hold the battery in a full charge
condition. The charge current is adjustable via an external
resistor. The internal thermal feedback circuitry regulates
the die temperature to optimize the charge rate for all
ambient temperatures. The RT9527 features 28V
maximum rating voltages for VIN. Other features include
under voltage protection and over voltage protection for
the AC adapter supply.
The RT9527 is available in a WDFN-8L 2x2 package.
Ordering Information
RT9527
Package Type
QW : WDFN-8L 2x2 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z 28V Maximum Rating for AC Adapter
z Internal Integrated Power FETs
z Adjustable Charging Current
z Programmable Safe Charge Timer
z NTC Thermistor Input
z Battery Reverse Protection
z ISET Pin Short Protection
z Charge Status Indicator
z AC Adapter Power Good Status Indicator
z End of Charge Current is 10% of Fast-Charge Current
z Under Voltage Protection
z Over Voltage Protection
z Thermal Feedback Optimized Charge Rate
z Small Thermally Enhanced 8-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Cellular Phones
z Digital Cameras
z PDAs and Smart Phone
z Portable Instruments
Marking Information
0S : Product Code
0SW
W : Date Code
Simplified Application Circuit
Input Power
VIN
BAT
RT9527
TIMER
PGOOD
CHG
ISET _GND
Battery
Indicator
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9527-00 May 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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