TPS72301

TPS72325

SLVS346−SEPTEMBER2003

www.ti.com

4

FUNCTIONAL BLOCK DIAGRAM

TPS72301

OUT

IN

FB

GND

EN

Vref

1.19 V

TPS72325

OUT

IN

GND

EN

Current Limit

/ Thermal

Protection

Current Limit

/ Thermal

Protection

NR

5 pF

100 k

Ω

Vref

1.19 V

100 k

Ω

5 pF

−

+

−

+

R1

R1

R2

R1 + R2 = 97 k

W

R1 + R2 = 97 k

W

R2

Terminal Functions

TERMINAL

DESCRIPTION

NAME

NO.

DESCRIPTION

GND

1

Ground

VIN

2

Unregulated input supply

EN

3

Bipolar enable pin. Driving this pin above the positive enable threshold or below the negative enable threshold turns

on the regulator. Driving this pin below the positive disable threshold and above the negative disable threshold puts

the regulator into shutdown mode.

NR

4

Fixed voltage versions only. Connecting an external capacitor between this pin and ground, bypasses noise

generated by the internal bandgap. This allows output noise to be reduced to very low levels.

FB

4

Adjustable voltage version only. This is the input to the control loop error amplifier. It is used to set the output voltage

of the device

VOUT

5

Regulated output voltage. A small 2.2

µF ceramic capacitor is needed from this pin to GND to ensure stability.