RT9502 RICHTEK [Richtek Technology Corporation], RT9502 Datasheet - Page 2

• Manufacturer Part Number: RT9502
• Description: Linear Single Cell Li-Ion Battery Charger IC with Dual Input Supply
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9502
Typical Application Circuit
Functional Pin Description
www.richtek.com
2
11 (Exposed Pad)
Pin No.
10
1
2
3
4
5
6
7
8
9
To System
To System
Pin Name
ACIN
USB
CHG_S
PGOOD
GND
ISETA
ISETU
EN
TS
BATT
GND
Adapter
AC
USB
Pre-Charge Phase
1/10 Programmed
5, Exposed Pad(11)
Charge Current
Charge Current
Programmed
AC Adaptor Charge Input Supply.
USB Charge Input Supply.
Charge Status Indicator Output (open drain).
Power Good Indicator Output (open drain).
Ground.
Wall Adaptor Supply Charge Current Set Point.
USB Supply Charge Current Set Input (active low).
Charge Enable Input (active low).
Temperature Sense Input.
Battery Charge Current Output.
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Pin Function
1uF
1uF
1
2
3
4
2.8V Precharge
ACIN
USB
CHG_S
PGOOD
GND
Fast Charge
Threshold
Phase
RT9502
ISETU
ISETA
BATT
EN
TS
Constant Voltage
10
9
8
7
6
Standby Phase
4.1V Recharge
Threshold
Phase &
Chip Shutdown
H : 500mA
L : 100mA
Chip Enable
Battery Pack
R
SET
Re-Charge Phase
Complete
Charge
0.1uF to 10uF
DS9502-02 April 2011
Battery
Voltage
Charging
Current