Diodes AP1121 User Manual

AP1121

DUAL 1A LOW DROPOUT POSITIVE REGULATOR

Features

• 1.3V maximum dropout at full load current

• Fast transient response

• Output current limiting for each channel

• Built-in thermal shutdown for each channel

• Good noise rejection

• Dual output ch1 = 3.3V, ch2 = 2.5V

(ch2 = 1.8V for version B)

• SOP-8L: Available in “Green” Molding Compound (No Br, Sb)

Lead Free Finish/ RoHS Compliant (Note 1)

Applications

• PC peripheral

• Communication

Ordering Information

AP 1121 X S X - 13

General Description

AP1121 is a low dropout positive regulator which provides 1A output current capability. The product is specifically designed to provide well-regulated supply for low voltage IC applications such as high-speed bus termination and low current 3.3V/2.5V or

3.3V/1.8V logic supply. AP1121 is guaranteed to have <1.3V dropout at full load current making it ideal to provide well regulated outputs dual channels with up to 18V input supply.

Vout

A : CH1=3.3V

CH2=2.5V

Package

S : SOP-8L

Lead Free

L : Lead Free

G : Green

Packing

13 : Tape & Reel

B : CH1=3.3V

CH2=1.8V

Device

AP1121XSL-13

Lead-free

AP1121XSG-13

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be on found our website at http://www.diodes.com/datasheets/ap02001.pdf

Package

Code

S SOP-8L 2500/Tape & Reel -13 S SOP-8L 2500/Tape & Reel -13

Packaging

(Note 2)

.

Quantity Part Number Suffix

13” Tape and Reel

AP1121 Rev. 5 1 of 7 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Pin Assignments

( Top View )

AP1121

DUAL 1A LOW DROPOUT POSITIVE REGULATOR

V

OUT1

V

IN1

1

2

GND

8

GND

7

AP1121

3

V

IN2

OUT2

4

V

SOP-8L

6

GND

5

GND

Pin Descriptions

Pin Name Descriptions

GND Ground

3.3V(V

2.5V/1.8V (V

OUT2

OUT1

)

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

connected from this pin to ground to insure stability.

VIN

AP1121 Rev. 5 2 of 7 FEBRUARY 2009

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

connected from this pin to ground.

www.diodes.com © Diodes Incorporated

Block Diagram

AP1121

DUAL 1A LOW DROPOUT POSITIVE REGULATOR

2

V

IN1

Thermal

Shutdown

3

V

IN2

Thermal

Shutdown

Typical Application Circuit

1

V

OUT1

+

-

+

CURRENT

LIMIT

+

-

+

CURRENT

LIMIT

+

-

1.25V

-

1.25V

+

5/6

GND

4

V

OUT2

+

7/8

GND

3.3V/1A

C1

100uF

5V

C2

100uF

2.5V/1A C3

V

OUT1

IN1

IN2

OUT2

GND

GNDV GND

100uF

(3.3V/2.5V Dual output )

AP1121 Rev. 5 3 of 7 FEBRUARY 2009