RT9629B

2

DS9629B-06

July 2015

www.richtek.com

©

Copyright

2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Function Pin Description

Pin No.

Pin Name

Pin Function

1, 12, 19

UGATE3,

UGATE1,

UGATE2

High Side Gate Drive Outputs for Phase 3, Phase 1, and Phase 2. Connect this

pin to the Gate of high side power MOSFET.

2, 11, 20

BOOT3,

BOOT1,

BOOT2

Bootstrap Power Pins for Phase 3, Phase 1, and Phase 2. This pin powers the

high side MOSFET driver. Connect this pin to the junction of the bootstrap

capacitor and the cathode of the bootstrap diode.

3, 14, 23,

25 (Exposed Pad)

GND

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

GND for maximum power dissipation.

4, 6, 8

NC

No Internal Connection.

5, 7, 9

PWM3,

PWM2,

PWM1

PWM Signal Input. Connect this pin to the PWM output of the controller.

10

POR

Power On Reset Signal.

13, 18, 24

PHASE1,

PHASE2,

PHASE3

Switch Nodes of High Side Driver 1, Driver 2, and Driver 3. Connect this pin to

the high side MOSFET Source together with the low side MOSFET Drain and

the inductor.

15, 17, 22

LGATE1,

LGATE2,

LGATE3

Low Side Gate Drive Output for Phase 1, Phase 2, and Phase 3. This pin drives

the Gate of low side MOSFET.

16, 21

VCC1, VCC2

Supply Input Pin. VCC1 supplies current for Channel 1 and Channel 2 gate

drivers. VCC2 supplies current for Channel 3 gate driver.

Ordering Information

Note :

Richtek products are :

ments of IPC/JEDEC J-STD-020.

(TOP VIEW)

WQFN-24L 5x5

Pin Configurations

Lead Plating System

Z : ECO (Ecological Element with

Halogen Free and Pb free)

RT9629B

Package Type

QW : WQFN-24L 5x5 (W-Type)

UGATE3

NC

GND

BOOT3

PHASE2

LGATE1

VCC1

LGATE2

NC

PWM3

PHASE1

GND

25

GND

18

17

16

15

1

2

3

4

89

10

11

23

22

21

20

14

13

5

6

7

24

12

19