RT9619/A

3

DS9619/A-04 March 2007

www.richtek.com

Function Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

BOOT

Floating bootstrap supply pin for upper gate drive.

2

PWM

Input PWM signal for controlling the driver.

3

NC

No Connection Pin.

4

VCC

+12V Supply Voltage.

5

LGATE

Lower Gate Drive Output. Connected to gate of low-side power N-Channel MOSFET.

6

PGND

Common Ground.

7

PHASE

Connected this pin to the source of the high-side MOSFET and the drain of the low-side

MOSFET.

8

UGATE

Upper Gate Drive Output. Connected to gate of high-side power N-Channel MOSFET.

Timing Diagram

PWM

UGATE

LGATE

t

pdhUGATE

t

pdlLGATE

t

pdlUGATE

t

pdhLGATE

90%

90%

2V

2V

2V

2V

Shoot-Through

Protection

Turn off Detect

Shoot-Through

Protection

Tri-State

Detect

VCC

PWM

Internal

5V

BOOT

UGATE

PHASE

LGATE

PGND

R

R

VCC

POR