Linear Regulator

Data Sheet

ADP1754/ADP1755

Rev. F

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FEATURES

Maximum output current: 1.2 A

Input voltage range: 1.6 V to 3.6 V

Low shutdown current: <2 µA

Very low dropout voltage: 105 mV @ 1.2 A load

Initial accuracy: ±1%

Accuracy over line, load, and temperature: ±2%

7 fixed output voltage options with soft start

0.75 V to 2.5 V (ADP1754)

Adjustable output voltage option with soft start

0.75V to 3.3V (ADP1755)

High PSRR

65 dB @ 1 kHz

65 dB @ 10 kHz

54 dB @ 100 kHz

23 μV rms at 0.75 V output

Stable with small 4.7 µF ceramic output capacitor

Excellent load and line transient response

Current-limit and thermal overload protection

Power-good indicator

Logic-controlled enable

Reverse current protection

APPLICATIONS

Server computers

Memory components

Telecommunications equipment

Network equipment

DSP/FPGA/microprocessor supplies

Instrumentation equipment/data acquisition systems

TYPICAL APPLICATION CIRCUITS

TOP VIEW

(Not to Scale)

ADP1754

1

2

3

4

VIN

VIN

100kΩ

4.7µF

4.7µF

VIN

EN

12

11

10

9

VOUT

VOUT

VOUT

SENSE

5

6

7

8

PG

GND

SS

NC

PG

16

15

14

13

VIN

VIN VOUT VOUT

10nF

Figure 1. ADP1754 with Fixed Output Voltage, 1.5 V

TOP VIEW

(Not to Scale)

ADP1755

1

2

3

4

VIN

VIN

100kΩ

4.7µF

4.7µF

VIN

EN

12

11

10

9

VOUT

VOUT

VOUT

ADJ

5

6

7

8

PG

GND

SS

NC

PG

16

15

14

13

VIN

VIN VOUT VOUT

10nF

R2

R1

Figure 2. ADP1755 with Adjustable Output Voltage, 0.75 V to 3.3 V

GENERAL DESCRIPTION

The ADP1754/ADP1755 are low dropout (LDO) CMOS linear

regulators that operate from 1.6 V to 3.6 V and provide up to

regulation of nanometer FPGA geometries operating from 2.5 V

down to 1.8 V I/O rails, and for powering core voltages down to

0.75 V. Using an advanced proprietary architecture, the ADP1754/

ADP1755 provide high power supply rejection ratio (PSRR) and

low noise, and achieve excellent line and load transient response

with only a small 4.7 µF ceramic output capacitor.

The ADP1754 is available in seven fixed output voltage options.

The ADP1755 is the adjustable version, which allows output

voltages that range from 0.75 V to 3.3 V via an external divider.

The ADP1754/ADP1755 allow an external soft start capacitor

to be connected to program the startup. A digital power-good

output allows power system monitors to check the health of the

output voltage.

The ADP1754/ADP1755 are available in a 16-lead, 4 mm × 4 mm

LFCSP, making them not only very compact solutions, but also

providing excellent thermal performance for applications that

require up to 1.2 A of output current in a small, low profile

footprint.