www.ti.com

_

+

Thermal

Shutdown

Bandgap

Reference

1.225 V

Current

Sense

GND

EN

SHUTDOWN

UVLO

ILIM

External to

the Device

FB

UVLO

250 k

Ω

Quickstart

IN

OUT

_

+

Thermal

Shutdown

Current

Sense

GND

EN

SHUTDOWN

UVLO

ILIM

Bandgap

Reference

1.225 V

UVLO

250 k

Ω

NR

Quickstart

IN

OUT

TPS78601, TPS78618

TPS78625, TPS78628

TPS78630, TPS78633

SLVS389D – SEPTEMBER 2002 – REVISED OCTOBER 2004

FUNCTIONAL BLOCK DIAGRAM—ADJUSTABLE VERSION

FUNCTIONAL BLOCK DIAGRAM—FIXED VERSION

Terminal Functions

TERMINAL

DESCRIPTION

NAME

ADJ

FIXED

NR

NA

5

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

1

1

The EN 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 is in shutdown mode.

FB

5

N/A

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

GND

3, Tab

3, Tab Regulator ground

IN

2

2

Unregulated input to the device.

OUT

4

4

Output of the regulator.

4