RT9526A

2

DS9526A-01 April 2011

www.richtek.com

Function Block Diagram

Function Pin Description

Pin No.

Pin Name

Pin Function

1

VIN

Supply Voltage Input. VIN can withstand up to 28V input.

2

PGB

Power Good Indicator. This pin connects to VIN with 10SL N-MOSFET as

power good condition.

3

CHG_SB

Charge Status Indicator Output (Open drain). Indicate low when battery is

charging; indicate high when battery charging finished or any fault happened.

4

ENB

Charge Enable (Active Low). Connect this pin with 200k

Ω pull low resistor.

5,

9 (Exposed Pad)

GND

Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

6

IMIN

EOC Current Setting Pin.

7

ISET

Charge Current Set Point.

8

BATT

Battery Charge Current Output.

Typical Application Circuit

IMIN

CHG_SB

BATT

ENB

RT9526A

VIN

Adapter or USB

GND

PGB

ISET

R1

R2

CC/CV/TR

Multi Loop

Controller

Logic

200k

BATT

CHG_SB

GND

PGB

ENB

ISET

VIN

IMIN

Current

Set Block

Sleep

Mode

OVP

UVLO

BASE

EOC Set

Block

Switch

Well