RT9259C View Datasheet(PDF) - Richtek Technology

Part Name

Description

View to exact match

RT9259C

12V Synchronous Buck PWM DC-DC and Linear Power Controller

Richtek Technology 

RT9259C

Pin Configurations

(TOP VIEW)

BOOT

RT_DIS 2

COMP 3

FB 4

DRV 5

FBL 6

GND 7

14 UGATE

13 PHASE

12 PGND

11 LGATE

10 NC

9 NC

8 VCC12

BOOT

RT_DIS 2

COMP 3

FB 4

DRV 5

FBL 6

GND 7

GND 8

16 UGATE

15 PHASE

14 PGND

13 LGATE

12 NC

11 NC

10 VCC12

9 VCC12

16 15 14 13

COMP 1

12 PGND

FB 2

DRV 3

FBL 4

11 LGATE

10 NC

17

9 NC

5678

SOP-14

Typical Application Circuit

VCC

+12V

VIN2

+5V to +12V

Q3

VOUT2

COUT2

SSOP-16

RT9259C

BOOT

VCC12

DRV

UGATE

PHASE

FBL

LGATE

RT_DIS

GND

NC

NC

PGND

FB

COMP

VQFN-16L 4x4

VIN1

+3.3V/+5V/+12V

CIN

Q1 LOUT

1

VOUT1

Q2

COUT

Functional Pin Description

Pin No.

Pin

RT9259C…S RT9259C…A RT9259CPQV Name

Pin Function

Bootstrap supply for the upper gate driver. Connect the

1

1

15

BOOT

bootstrap capacitor between BOOT pin and the PHASE pin.

The bootstrap capacitor provides the charge to turn on the

upper MOSFET.

Connect a resistor from RT_DIS to GND to set frequency. In

2

2

16

RT_DIS addition, if this pin is pulled down towards GND, it will disable

both regulator outputs until released.

3

3

1

COMP

Buck converter external compensation. This pin is used to

compensate the control loop of the buck converter.

Buck converter feedback voltage. This pin is the inverting

4

4

2

FB

input of the PWM error amplifier. FB senses the switcher

output through an external resistor divider network.

5

5

3

DRV

Connect this pin to the gate of an external MOSFET. This pin

provides the drive for the linear regulator’s pass MOSFET.

To be continued

www.richtek.com

2

DS9259C-03 August 2007

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