RT9259 Ver la hoja de datos (PDF) - Richtek Technology

Número de pieza

componentes Descripción

Fabricante

RT9259

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

Richtek Technology 

RT9259

Pin No.

Pin Name

RT9259…S RT9259…A RT9259PQV

Pin Function

6

6

Linear regulator feedback voltage. This pin is the inverting

4

FBL

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

6, 8, 9, 10,

Exposed Pad (17)

NC

11

LGATE

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

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

No Internal Connection.

Lower gate driver output. Connect to the gate of the

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

VCC12

BOOT

UGATE

PHASE

LGATE

PGND

FB

DS9259-03T00 August 2007

COMP

www.richtek.com

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