RT9503 Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – Fully Integrated Linear Single Cell Li-Ion Battery Charger with Power Path

RT9503
Fully Integrated Linear Single Cell Li-Ion Battery Charger
with Power Path
General Description
Features
The RT9503 is a fully integrated low cost single-cell Li-
Ion battery charger IC ideal for portable applications. The
RT9503 is capable of being powered up from AC adapter
and the USB (Universal Serial Bus) port inputs. The
RT9503 can automatically detect and select the AC
adapter and the USB port as the power source for the
charger. The RT9503 enters sleep mode when both
supplies are removed.
The RT9503 optimizes the charging task by using a control
algorithm including preconditioning 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 ratings100mA 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 RT9503 features 18V and 7V maximum rating voltages
for AC adapter and USB port inputs respectively. The other
features are external programmed safety timer, under
voltage protection, over voltage protection for AC adapter
supply, battery temperature monitoring, power supply
status indicators and charge status indicator.
Ordering Information
RT9503
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
z Automatic Input Supplies Selection
z 18V Maximum Rating for AC Adapter
z Integrated Selectable 100mA and 500mA USB
Charge Current
z Internal Integrated Power FETs
z AC Adapter Power Good Status Indicator
z Charge Status Indicator
z External Capacitor Programmable Safety Timer
z Under Voltage Protection
z Over Voltage Protection
z Automatic Recharge Feature
z Battery Temperature Monitoring
z Small 16-Lead WQFN Package
z Thermal Feedback Optimizing Charge Rate
z Power Path Controller
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Digital Cameras
z Cellular Phones
z PDAs and Smart Phones and MP3
z Portable Instruments
Pin Configurations
(TOP VIEW)
16 15 14 13
ACIN 1
USB 2
CHG_S 3
AC_PGOOD 4
GND
17
12 BATT
11 TS
10 TIMER
9 EN
5678
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.
WQFN-16L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9503-03 April 2011
www.richtek.com
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