TPS79201, TPS79225

TPS79228, TPS79230

SLVS337B – MARCH 2001 – REVISED MAY 2002

www.ti.com

4

FUNCTIONAL BLOCK DIAGRAM—ADJUSTABLE VERSION

_

+

Thermal

Shutdown

Bandgap

Reference

VIN

Current

Sense

R2

VIN

GND

EN

VOUT

SHUTDOWN

Vref

UVLO

ILIM

External to

the Device

FB

R1

UVLO

250 k

Ω

Bypass

FUNCTIONAL BLOCK DIAGRAM—FIXED VERSION

_

+

Thermal

Shutdown

VIN

Current

Sense

R1

R2

VIN

GND

EN

VOUT

SHUTDOWN

Vref

UVLO

ILIM

Bandgap

Reference

UVLO

250 k

Ω

Bypass

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

ADJ

FIXED

I/O

DESCRIPTION

BYPASS

4

4

An external bypass capacitor, connected to this terminal, in conjunction with an internal resistor, creates a

low-pass filter to further reduce regulator noise.

EN

3

3

I

TheEN terminal is an input which enables or shuts down the device. When EN goes to a logic high, the device

will be enabled. When the device goes to a logic low, the device will be in shutdown mode.

FB

5

N/A

I

This terminal is the feedback input voltage for the adjustable device.

GND

2

2

Regulatorground

IN

1

1

I

The IN terminal is the input to the device.

OUT

6

5

O

The OUT terminal is the regulated output of the device.