RT9502 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – Linear Single Cell Li-Ion Battery Charger IC with Dual Input Supply

RT9502
Linear Single Cell Li-Ion Battery Charger IC with
Dual Input Supply
General Description
The RT9502 is a fully integrated low cost single-cell Li-
Ion battery charger IC ideal for portable applications. The
RT9502 is capable of being powered up from AC adapter
and USB (Universal Serial Bus) port inputs. The RT9502
can automatically detect and select the AC adapter and
the USB port as the power source for the charger. The
RT9502 enters sleep mode when both supplies are
removed.
The RT9502 optimizes the charging task by using a control
algorithm including precondition mode, fast charge mode
and constant voltage mode. The charging task is
terminated as the charge current drops below the preset
threshold. The USB charge current can be selected from
preset ratings of 100mA and 500mA, while the AC adapter
charge current can be programmed up to 1A with an
external resister. The internal thermal feedback circuitry
regulates the die temperature to optimize the charge rate
for all ambient temperatures.
The RT9502 features 18V and 7V maximum rating voltages
for AC adapter and USB port inputs respectively. The other
features are under voltage protection, over voltage
protection for AC adapter supply and battery temperature
monitoring.
Features
z Automatic Input Supplies Selection
z 18V Maximum Rating for AC Adapter
z Integrated Selectable 100mA and 500mA USB
Charge Current
z Internal Integrated P-MOSFETs
z AC Adapter Power Good Status Indicator
z Charge Status Indicator
z Under Voltage Protection
z Over Voltage Protection
z Automatic Recharge Feature
z Battery Temperature Monitoring
z Small 10-Lead WDFN Package
z Thermal Feedback Optimizing Charge Rate
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Digital Cameras
z Cellular Phones
z Personal Digital Assistants (PDAs)
z MP3 Players
z Hand Held PCs
Pin Configurations
Ordering Information
RT9502
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
(TOP VIEW)
ACIN 1
USB 2
CHG_S ³
PGOOD ⁴
GND 5
GND
11
10 BATT
9 TS
8 EN
7 ISETU
ISETA
WDFN-10L 3x3
Note :
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9502-02 April 2011
www.richtek.com
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