1A Low Dropout Positive Regulator

AP1122

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Oct 21, 2004

3/10

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

Power Dissipation

Internally Limited

Storage Temperature

-65 to +150

Operating Junction Temperature Range

0 to +150

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

Output Voltage

1.176

1.2

1.224

V

Line Regulation

0.2

%

Load Regulation

(Note 1,2)

1

%

Dropout Voltage

1.3

1.4

V

Current Limit

1. 1

A

Minimum Load

Current

0

5

10

mA

Thermal Regulation

0.008

0.04

%/W

Ripple Rejection

60

70

dB

0.5

%

JA

θ Thermal

Resistance Junction-

to-Ambient (No heat

sink ;No air flow)

SOT89

SOT-223

TO-252

TO-220/263

300

117

92

85

JC

θ Thermal

Resistance

Junction-to-Case

SOT89 : Control Circuitry/Power Transistor

SOT-223 : Control Circuitry/Power Transistor

TO-263 : Control Circuitry/Power Transistor

TO-252 : Control Circuitry/Power Transistor

TO-220 : Control Circuitry/Power Transistor

100

15

0.65/2.7

10

0.65/2.7

Note1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured

at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the

package.

Note2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the

difference between input and output differential and the output current. Guaranteed maximum power dissipation will not be

available over the full input/output range.

Note3: Quiescent current is defined as the minimum output current required in maintaining regulation. At 12V input/output differential the

device is guaranteed to regulate if the output current is greater than 10mA.