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FUNCTIONAL BLOCK DIAGRAMS

ADJUSTABLE VERSION

_

+

Thermal

Shutdown

Bandgap

Reference

1.22V

Current

Sense

R2

GND

EN

SHUTDOWN

UVLO

ILIM

External to

the Device

R1

UVLO

2.45V

250 k

Ω

NR

FB

59 k

QuickStart

OUT

IN

IN

FIXED VERSION

_

+

Thermal

Shutdown

Current

Sense

R1

R2

GND

EN

SHUTDOWN

UVLO

ILIM

250 k

Ω

NR

QuickStart

Bandgap

Reference

1.22V

UVLO

2.45V

R2 = 40 k

Ω

IN

IN

OUT

TPS73001, TPS73018

TPS73025

TPS73030, TPS73033

SBVS054A – NOVEMBER 2004 – REVISED NOVEMBER 2004

Terminal Functions

TERMINAL

DESCRIPTION

SOT23

SOT23

NAME

ADJ

FIXED

Connecting an external capacitor to this pin bypasses noise generated by the internal bandgap. This

NR

4

4

improves power-supply rejection and reduces output noise.

Driving the enable pin (EN) high turns on the regulator. Driving this pin low puts the regulator into shutdown

EN

3

3

mode. EN can be connected to IN if not used.

FB

5

N/A

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

GND

2

2

Regulator ground

IN

1

1

Unregulated input to the device.

OUT

6

5

Output of the regulator.

4