RT8074

2

DS8074-07

November 2012

www.richtek.com

©

Copyright

2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Function Block Diagram

Pin No.

Pin Name

Pin Function

1

COMP

Error Amplifier Compensation Point. The current comparator threshold increases

with this control voltage. Connect external compensation elements to this pin to

stabilize the control loop.

2,

9 (Exposed Pad)

GND

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

for maximum power dissipation.

3

EN

Enable Control Input. Float or connect this pin to logic high for enable. Connect to

GND for disable.

4

VIN

Power Input Supply. Decouple this pin to GND with a capacitor.

5, 6

LX

Internal Power MOSFET Switches Output. Connect this pin to the inductor.

7

RT

Oscillator Resistor Input. Connecting a resistor from this pin to GND sets the

switching frequency. If this pin is floating, the frequency will be set at 2MHz

internally.

8

FB

Feedback. Receives the feedback voltage from a resistive divider connected across

the output.

Marking Information

RT8074GSP : Product Number

YMDNN : Date Code

RT8074

GSPYMDNN

Driver

NISEN

Control

Logic

0.7V

0.4V

ISEN

Slope

Com

OSC

Output

Clamp

EA

0.8V

Int-SS

Enable

OTP

COMP

RT

FB

VIN

GND

SD

LX

UV

P-G

Hiccup

OC

Limit

EN