AP7173

1.5A LOW DROPOUT LINEAR REGULATOR WITH

PROGRAMMABLE SOFT-START

AP7173 Rev. 7

4 of 16

OCTOBER 2009

DS31369

www.diodes.com

Pin Descriptions

PIN #

Pin

Name

SOP-8L-EP

DFN3030-10

Description

IN

1

1, 2

Power Input pin.

PG

2

3

threshold, the PG pin goes into a high-impedance state. To use the

PG pin, use a 10k

Ω to 1MΩ pull-up resistor to pull it up to a supply of

up to 5.5V, which can be higher than the input voltage.

VCC

3

4

Bias Input pin, provides input voltage for internal control circuitry.

EN

4

5

Enable pin. This pin should be driven either high or low and must not

be floating. Driving this pin high enables the regulator, while pulling it

low puts the regulator into shutdown mode.

GND

5

6

Ground.

SS

6

7

Soft-Start pin. Connect a capacitor between this pin and the ground

to set the soft-start ramp time of the output voltage. If no capacitor is

connected, the soft-start time is typically 100µS.

FB

7

8

Feedback pin. Connect this pin to an external voltage divider to set

the output voltage.

OUT

8

9, 10

Regulated Output pin.

Thermal Pad

—

—

Solder this pad to large ground plane for increased thermal

performance.

Block Diagram

Gate

Driver

Current Limit and

Thermal Shutdown

0.8V

0.72V

OUT

SS

FB

GND

IN

VCC

PG

EN

+

-

+

-