ADP1754 查看數據表（PDF） - Analog Devices

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ADP1754

1.2 A, Low VIN, Low Dropout Linear Regulator

Analog Devices 

Data Sheet

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

0.75 V to 3.3 V (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

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

1.2 A of output current. These low VIN/VOUT LDOs are ideal for

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

1.2 A, Low VIN, Low Dropout

Linear Regulator

ADP1754/ADP1755

TYPICAL APPLICATION CIRCUITS

VIN = 1.8V

VOUT = 1.5V

4.7µF

100kΩ

PG

16 15 14 13

VIN VIN VOUT VOUT

1 VIN

VOUT 12

2 VIN

3 VIN

ADP1754 VOUT 11

TOP VIEW

(Not to Scale) VOUT 10

4 EN

SENSE 9

PG GND SS NC

5678

4.7µF

10nF

VIN = 1.8V

Figure 1. ADP1754 with Fixed Output Voltage, 1.5 V

VOUT = 0.5V(1 + R1/R2)

4.7µF

100kΩ

PG

16 15 14 13

VIN VIN VOUT VOUT

1 VIN

VOUT 12

2 VIN

3 VIN

ADP1755 VOUT 11

TOP VIEW

(Not to Scale) VOUT 10

4 EN

PG GND SS

567

ADJ 9

NC

8

4.7µF

R1

R2

10nF

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

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.

Rev. F

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