RT8035

2

DS8035-05 October 2012

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Copyright 2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

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Function Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

EN1

Chip Enable of Channel 1 (Active High).

2

FB1

Feedback Input of Channel 1.

3

VIN2

Power Supply Input of Channel 2.

5

LX2

Switching Node of Channel 2.

6

EN2

Chip Enable of Channel 2 (Active High).

7

FB2

Feedback Input of Channel 2.

8

VIN1

Power Supply Input of Channel 1.

10

LX1

Switching Node of Channel 1.

4, 9, 11

GND

(Exposed Pad)

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

GND for maximum power dissipation.

Typical Application Circuit

COMP

RC

RS1

RS2

EN1/EN2

VIN1/VIN2

LX1/LX2

FB1/FB2

UVLO &

Power Good

Detector

Slope

Compensation

Current

Sense

OSC &

Shutdown

Control

Current

Limit

Detector

Driver

Control

Logic

GND

PWM

Comparator

Error

Amplifier

VIN1

8

RT8035

LX1 10

FB1 2

GND

4, 9

11 (Exposed Pad)

1 EN1

Chip Enable

LX2 5

FB2

7

VIN2

3

6 EN2

4.7µF

4.7µF

L1

2.2µH

L2

2.2µH

R1

110k

R2

110k

10µF

R3

110k

R4

110k

10µF