RT9511 Datasheet, PDF (3/24 Pages) Richtek Technology Corporation – Fully Integrated Battery Charger with Two Step-Down Converters

RT9511
Functional Pin Description
Pin No.
Pin Name
1, 5, 7,
GND
17 (Exposed Pad)
Pin Function
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
2
EN1
Chip Enable Input Pin of Buck Converter 1. (Active High)
3
VDD1
Power Input Pin of Buck Converter 1.
4
LX1
Switching Output Pin of Buck Converter 1.
6
FB2
Feedback Voltage Input Pin of Buck Converter 2.
8
EN2
Chip Enable Input Pin of Buck Converter 2. (Active High)
9
VDD2
Power Input Pin of Buck Converter 2.
10
LX2
Switching Output Pin of Buck Converter 2.
11
ISETA
Adaptor Supply Charge Current Set Point.
12
ISETU
USB Supply Charge Current Set Input.
13
NC
No Internal Connection.
14
EN
Charge Enable Input Pin of Charger. (Active Low)
15
TIMER
Safe Charge Timer Setting.
16
TS
Temperature Sense Input.
17
BATT
Battery Charge Current Output.
18
BAT_ON
Power path controller output. This pin is used to turn on an external
P-MOSFET.
19
SYS
System Voltage Detector Input Pin.
20
USB
USB Supply Voltage Input Pin.
21
AC_ON
P-MOSFET Switch Control Output (open drain).
22
ACIN
Adaptor Supply Voltage Input Pin.
23
CHG_S
Charge Status Indicator Output. (Open Drain)
24
FB1
Feedback Voltage Input Pin of Buck Converter 1.
DS9511-01 April 2011
www.richtek.com
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