RT9074 datasheet(3/16 Pages) RICHTEK

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RT9074

DS9074-01

December 2014

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Pin Description

Pin No.

RT9074-

25/33/50

GSP/GFP

RT9074

GSP/GFP

RT9074

Name

Function

VOUT

VOUT supplies power to the load. A minimum output capacitor

of 1

F is required for stable operation.

SENSE

Output Voltage Sense. For applications with VOUT  25V,

SENSE can be connected to the output voltage to optimize

the control loop compensation.

For applications with VOUT > 25V (adjustable versions only),

SENSE must be left unconnected. Control loop compensation

is optimized by adding a feed-forward capacitor in the

feedback resistor divider connected to FB (see Adjustable

Output Voltage and Compensation section).

No Internal Connection.

Feedback Input. Connect to the center tap of a resistor divider

for setting the output voltage. (Adjustable versions only)

No Internal Connection.

SHDN

Shutdown Control Input (Active High). Connect SHDN high to

disable the output voltage and reduce the IC’s quiescent

current to 2

A (typical). Connect SHDN low to enable the

output. SHDN is a high-voltage input (also able to withstand

reverse voltage) and can be connected directly to a

high-voltage input.

6, 7, 9*

GND

Ground. The exposed pad should be soldered to a large PCB

and connected to GND for maximum thermal dissipation.

VIN

Power Input. Bypass VIN with a 0.18

F or larger capacitor

with adequate voltage rating.

* exposed pad

Function Block Diagram

RT9074-25/33/50 (Fixed Output)

RT9074 (Adjustable Output)

Current Limit

Over-

Temperature

Protection

VIN

VOUT

SENSE

GND

Reference

SHDN

Error Amp

VIN

VOUT

SENSE

GND

Reference

SHDN

Error Amp

Current Limit

Over-

Temperature

Protection

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