RT9591

Preliminary

4

DS9591-07 August 2007

www.richtek.com

Patent Pending

Function Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

FB

Feedback Voltage Pin.

2

PGND

Power Ground.

3

EXT

Output Pin for driving external NMOS on Flyback topology.

4

GND

Ground.

5

VDD

Power Input Pin of RT9591.

6

CHARGE

Charge Enable Pin, the charge function is executed when CHARGE pin is set from

Low to High. And the RT9591 gets into Shutdown mode when CHARGE pin is set to

Low.

7

STAT

Charge Status Output. Open Drain output. When target output voltage is reached,

N-MOSFET turns off. This pin needs a pull up resistor.

8

FBVD

Voltage Detector Feedback Pin.

9

VDOUT

Voltage Detector Output Pin, Open Drain output.

10

IMCD

Minimum Current Detection Pin.

11

VDRV

IGBT Driver Power Pin.

12

DRVOUT IGBT Driver Output Pin.

13

GNDDRV IGBT Driver Ground Pin.

14

DRVIN

IGBT Driver Input Pin.

15

CS

Input Current Setting Pin.

16

VBAT

Battery Supply Voltage Input Pin.

Exposed Pad (17) GND

The exposed pad must be soldered to a large PCB and connected to GND for

maximum power dissipation.

Ω

RQ

S

One

Shot

+ -

RQ

S

HV Detector

One

Shot

Charging Block Enable

Latch

Chip Enable

Voltage Detector

1.0V Reference

IGBT Driver

DRVIN

FBVD

CHARGE

CS

VDD

GND

GNDDRV

DRVOUT

VDRV

STAT

VDOUT

FB

IMCD

Driver

3.6

36mV

VBAT

Charging Block

Latch

EXT

Constant Peak

Current Control

1M

VDD

PGND