Preliminary
RT9501A/B
Advanced Lithium-Ion Linear Battery Charger
General Description
Features
z For Single Lithium-Ion or Lithium-Polymer Cell
The RT9501 is a single Lithium-Ion or Lithium-Polymer
cell linear battery charger which is designed for compact
and cost-sensitive handheld devices. It combines charge
status indication, charge termination, battery temperature
monitoring, and high accuracy current and voltage
regulation in a MSOP-8 package.
Battery Pack (4.1V or 4.2V)
z A Few External Components are Required
z Precharge, Constant Current, Constant Voltage
Modes
z Battery Temperature Monitor
z Charge Status Indication
The RT9501 charges the battery in three modes,
precharge, constant current, constant voltage. If the
z Automatic Battery Recharge
z Charge Termination Detect
battery voltage is below the precharge threshold VO(MIN)
,
z Auto Low Power Sleep Mode when VDD Power is
Removed
the RT9501 precharges the battery with a lower
conditioning current.After precharge, the RT9501 applies
a constant current to the battery. An external sense-
resister sets the charge current. The constant voltage
mode continues until the battery reaches the regulation
voltage.
z MSOP-8 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Digital Cameras
The battery temperature is continuously measured by an
external thermistor through the TS pin. The RT9501
inhibits charge until the temperature is within the range
defined by users.
z PDAs
z Cellular Phones
z InformationAppliance
Marking Information
Ordering Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
RT9501
Package Type
F : MSOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Pin Configurations
(TOP VIEW)
Voltage Version
A : 4.1V
B : 4.2V
1
2
3
4
8
7
6
5
VDD
TS
STAT
BATT
CS
FB/CE
CC
GND
Note :
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
MSOP-8
`Suitable for use in SnPb or Pb-free soldering processes.
`100%matte tin (Sn) plating.
DS9501A/B-07 March 2007
www.richtek.com
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