AP1122

1A LOW DROPOUT POSITIVE REGULATOR

AP1122 Rev. 2

3 of 9

FEBRUARY 2007

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Block Diagram

3

Thermal

Shutdown

1

2

Vout

GND

1.2V

+

+

CURRENT

LIMIT

Vin

+

+

Pin Descriptions

NAME

I/O

PIN #

FUNCTION

GND

I

1

Ground Pin

Vout

O

2

The output of the regulator. A minimum of 10uF capacitor (0.15Ω ≤ ESR ≤ 20Ω) must

be connected from this pin to ground to insure stability.

Vin

I

3

The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is

connected from this pin to ground to insure that the input voltage does not sag below

the minimum dropout voltage during the load transient response. This pin must

always be 1.3V higher than Vout in order for the device to regulate properly.

Absolute Maximum Ratings

Symbol

Parameter

Rating

Unit

Vin

DC Supply Voltage

-0.3 to 12

V

Storage Temperature

-65 to +150

Operating Junction Temperature Range

0 to +125

Maximum Junction Temperature

150

oC