2 A, Low Dropout, CMOS Linear Regulator

Preliminary Technical Data

ADP1740/ADP1741

Rev. PrA

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FEATURES

Maximum output current: 2 A

Input voltage range: 1.6 V to 3.6 V

Low shutdown current: <1 μA

Low dropout voltage: 200 mV @ 2 A load

Initial accuracy: ±1%

Accuracy over line, load, and temperature: ±2.5%

7 fixed output voltage options with soft start (ADP1740):

0.75 V to 2.5 V

Adjustable output voltage options with soft start (ADP1741):

0.75 V to 3.0 V

Stable with small 4.7 μF ceramic output capacitor

Excellent load/line transient response

Current limit and thermal overload protection

Power Good indicator

Logic-controlled enable

APPLICATIONS

Notebook computers

Memory components

Telecommunications equipment

Network equipment

DSP/FPGA/microprocessor supplies

Instrumentation equipment/data acquisition systems

TYPICAL APPLICATION CIRCUITS

PIN 1

INDICATOR

1

2

3

4

IN

IN

100kΩ

4.7µF

4.7µF

IN

EN

12

11

10

9

OUT

OUT

OUT

SENSE

5

6

7

8

PG GND SS

NC

NC = NO CONNECT

16

15

14

13

IN

IN

OUT OUT

TOP VIEW

(Not to Scale)

ADP1740

10nF

Figure 1. ADP1740 with Fixed Output Voltage, 1.5 V

PIN 1

INDICATOR

1

2

3

4

IN

IN

R1

R2

4.7µF

IN

EN

12

11

10

9

OUT

OUT

OUT

ADJ

5

6

7

8

PG GND SS

NC

NC = NO CONNECT

16

15

14

13

IN

IN

OUT OUT

TOP VIEW

(Not to Scale)

ADP1741

10nF

4.7µF

100kΩ

Figure 2. ADP1741 with Adjustable Output Voltage, 0.75 V to 3.0 V

GENERAL DESCRIPTION

The ADP1740/ADP1741 are CMOS, low dropout linear regula-

tors that operate from 1.6 V to 3.6 V and provide up to 2 A of

output current. Using an advanced proprietary architecture,

they provide high power supply rejection and achieve excellent

line and load transient response with a small 4.7 μF ceramic

output capacitor.

The ADP1740 is available in seven fixed output voltage options.

The ADP1741 is an adjustable output voltage version, which

allows output voltages that range from 0.75 V to 3.0 V via

an external divider. The ADP1740/ADP1741 allow an external

soft start capacitor to be connected to program the start-up.

The ADP1740/ADP1741 are available in a 16-lead, 4 mm ×

4 mm LFCSP, making them very compact solutions while

providing excellent thermal performance for applications

requiring up to 2 A of output current in a small, low profile

footprint.