RT9259C Ver la hoja de datos (PDF) - Richtek Technology

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componentes Descripción

Fabricante

RT9259C

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

Richtek Technology 

RT9259C

Pin No.

RT9259C…S RT9259C…A RT9259CPQV

Pin

Name

Pin Function

6

6

Linear regulator feedback voltage. This pin is the

4

FBL

inverting input of the LDO error amplifier and protection

monitor. Connect this pin to an external resistor divider

network of the linear regulator.

7

7, 8

5

GND Ground.

8

9, 10

11

9, 10

11, 12

13

7

VCC12

Connect this pin to a well-decoupled 12V bias supply. It is

also the positive supply for the lower gate driver, LGATE.

6, 8, 9, 10,

Exposed Pad (17)

NC

No Internal Connection.

Lower gate driver output. Connect to the gate of the

11

LGATE

low-side power N-MOSFET. This pin is monitored by the

adaptive shoot-through protection circuitry to determine

when the lower MOSFET has turned off.

12

14

12

PGND Power ground return for the lower gate driver.

13

15

14

16

Connect this pin to the source of the upper MOSFET and

13

PHASE

the drain of the lower MOSFET. This pin is monitored by

the adaptive shoot-through protection circuitry to

determine when the upper MOSFET has turned off.

14

UGATE

Connect this pin to a well-decoupled 12V bias supply. It is

also the positive supply for the lower gate driver, LGATE.

Function Block Diagram

FBL

DRV

RT_DIS

GND

Voltage

Bias

Reference

VREF2

VCC12

-

+

+

Inhibit

0.4V

-

+

-

+

Shutdown

VREF1

Oscillator

SSE

+

+ EA

-

Power

On Reset

5V

Regulator

5VDD

POR

OC

+

0.4V

40uA

Soft-Start

-

&

Fault Logic

ROCSET

20k

SSE

PH_M

-

+

1.5V

+

-

PWM

Driver

Logic

FB

COMP

VCC12

BOOT

UGATE

PHASE

LGATE

PGND

DS9259C-03 August 2007

www.richtek.com

3

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