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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

TPS79301, TPS79318

TPS79325, TPS79328, TPS793285

TPS79330, TPS79333, TPS793475

SLVS348H – JULY 2001 – REVISED OCTOBER 2004

Terminal Functions

TERMINAL

DESCRIPTION

SOT23

SOT23

WCSP

NAME

ADJ

FIXED

FIXED

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

NR

4

4

B2

This 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

EN

3

3

A3

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

FB

5

N/A

N/A

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

GND

2

2

A1

Regulator ground

IN

1

1

C3

Unregulated input to the device.

OUT

6

5

C1

Output of the regulator.

5