800 mA Ultralow Noise,

High PSRR, RF Linear Regulator

Data Sheet

ADM7151

Rev. B

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FEATURES

Input voltage range: 4.5 V to 16 V

Maximum output current: 800 mA

Adjustable output from 1.5 V to 5.1 V

Low noise

1.0 μV rms total integrated noise from 100 Hz to 100 kHz

1.6 μV rms total integrated noise from 10 Hz to 100 kHz

Noise spectral density: 1.7 nV√Hz from 10 kHz to 1 MHz

Power supply rejection ratio (PSRR) at 400 mA load

Initial voltage accuracy: ±1%

Voltage accuracy over line, load and temperature: ±2%

Low shutdown current: 0.1 μA

Stable with a 10 μF ceramic output capacitor

8-lead LFCSP package and 8-lead SOIC package

APPLICATIONS

Regulated power noise sensitive applications

RF mixers, phase-locked loops (PLLs), voltage-controlled

oscillators (VCOs), and PLLs with integrated VCOs

Clock distribution circuits

Ultrasound and other imaging applications

High speed RF transceivers

High speed, 16-bit or greater ADCs

Communications and infrastructure

Cable digital-to-analog converter (DAC) drivers

TYPICAL APPLICATION CIRCUIT

VOUT

REF

REF_SENSE

GND

VIN

EN

BYP

VREG

ADM7151-04

10µF

1µF

1µF

1kΩ < R2 < 200kΩ

10µF

10µF

OFF

ON

R1

R2

GENERAL DESCRIPTION

The ADM7151 is a low dropout (LDO) linear regulator that

operates from 4.5 V to 16 V and provides up to 800 mA of output

current. Using an advanced proprietary architecture, it provides

high power supply rejection (>90 dB from 1 kHz to 1 MHz),

ultralow noise (1.7 nV√Hz from 10 kHz to 1 MHz), and excellent

line and load transient response with a 10 μF ceramic output

capacitor. The output voltage can be set to any voltage between

1.5 V and 5.1 V with two resistors.

The ADM7151 is available in two models that optimize power

dissipation and PSRR performance as a function of input and

output voltage. See Table 6 and Table 7 for selection guides.

The ADM7151 regulator output noise is 1.0 μV rms from

100 Hz to 100 kHz, and the noise spectral density is 1.7 nV/√Hz

from 10 kHz to 1 MHz.

The ADM7151 is available in 8-lead, 3 mm × 3 mm LFCSP and

8-lead SOIC packages, making it not only a very compact solution,

but also providing excellent thermal performance for applications

requiring up to 800 mA of output current in a small, low profile

footprint.

100k

1

10

100

1k

10k

0.1

1

10

100

1k

10k

100k

1M

FREQUENCY (Hz)