2

DS8079-01

February 2013

www.richtek.com

RT8079

©

Copyright

2013 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Function Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

1, 2, 16

VIN

Power Input.

3, 4,

17 (Exposed Pad)

GND

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

connected to GND for maximum power dissipation.

5

AGND

Analog Ground.

6

FB

Feedback Input.

7

COMP

Compensation Node for Converter Stability.

8

RT/SYNC

Frequency Setting and External Synchronous. Clock input.

9

SS/TR

Soft-Start and Tracking.

10 to 12

SW

Switch Node. Connect this pin to external L-C filter.

13

BOOT

Bootstrap Supply for High Side Gate Driver. Connect a capacitor between the

BOOT and SW pin.

14

PGOOD

Output of Power Good Indicator.

15

EN

Chip Enable. Externally pulled high to enable and pulled low to disable this

chip. It is internally pulled up to high when the pin is floating.

Pin Configurations

(TOP VIEW)

WQFN-16L 3x3

GND

GND

VIN

VIN

SW

SW

SS/TR

SW

12

11

10

9

13

14

15

16

1

2

3

4

8

7

6

5

GND

17

EN

VIN

SW

FB

Slope

Compensation

Shutdown

Control

Over Temperature

Protection

Current

Sense

Driver

Control

Logic

PWM

Comparator

GND

BOOT

UVLO

Error

Amplifier

Oscillator

Soft-Start

EN Threshold

PGOOD Threshold

GND

SS/TR

AGND

COMP

RT/SYNC

PGOOD

PGOOD Comparator

Internal pull up

current

Enable Comparator