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RT9503A Fully Integrated Linear Single Cell Li-Ion Battery Charger with Power Path Richtek
Richtek Technology Richtek
RT9503A Datasheet PDF : 15 Pages
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Fully Integrated Linear Single Cell Li-Ion Battery Charger
with Power Path
General Description
The RT9503A is a fully integrated low cost single-cell Li-
Ion battery charger IC ideal for portable applications. The
RT9503A is capable of being powered up via the AC adapter
and USB (Universal Serial Bus) port inputs. The RT9503A
can automatically detect and select the AC adapter and
the USB port as the power source for the charger. The
RT9503A enters sleep mode when both supplies are
The RT9503A 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 ratings of 100mA and 500mA, while the AC
adapter charge current can be programmed up to 1A with
an external resistor. The internal thermal feedback circuitry
regulates the die temperature to optimize the charge rate
for all ambient temperatures.
The RT9503A features 18V and 7V maximum rating
voltages for AC adapter and USB port inputs respectively.
Other features include external programmable safety timer,
under voltage protection, over voltage protection for AC
adapter supply, battery temperature monitoring, power
supply status indicators and charge status indicator.
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 MOSFETs
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 Halogen Free
z Digital Cameras
z Cellular Phones
z PDAs , Smart Phones and MP3 Players
z Portable Instruments
Pin Configurations
Ordering Information
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
16 15 14 13
11 TS
9 EN
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
DS9503A-01 April 2011
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