600 mA, Ultralow Noise,

High PSRR, RF Linear Regulator

Data Sheet

ADM7155

Rev. C

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FEATURES

Input voltage range: 2.3 V to 5.5 V

Output voltage range: 1.2 V to 3.4 V

Maximum load current: 600 mA

Low noise

0.9 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: 1.5 nV/√Hz from 10 kHz to 1 MHz

PSRR: >90 dB from 200 Hz to 200 kHz; 57 dB at 1 MHz

Initial accuracy: ±0.5%

Accuracy over line, load, and temperature: −2.0% (minimum),

+1.5% (maximum)

Low shutdown current: 0.2 μA

Stable with a 10 μF ceramic output capacitor

8-lead LFCSP and 8-lead SOIC packages

Precision enable

Supported by ADIsimPower tool

APPLICATIONS

Regulation to noise sensitive applications: PLLs, VCOs, and

PLLs with integrated VCOs

Communications and infrastructure

Backhaul and microwave links

TYPICAL APPLICATION CIRCUIT

VOUT

REF_SENSE

REF

REF = 1.2V

VIN

EN

ADM7155

GND

1µF

10µF

10µF

OFF

ON

1kΩ < R2 < 200kΩ

BYP

1µF

VREG

10µF

R1

R2

Figure 1. Regulated 3.0 V Output from 3.5 V Input

FREQUENCY (Hz)

1M

0.1

1

10

100

1k

10k

100k

0.1

1

10

100

10k

1k

NOISE FLOOR

1.0µF

3.3µF

10µF

33µF

100µF

330µF

1000µF

GENERAL DESCRIPTION

The ADM7155 is an adjustable linear regulator that operates

from 2.3 V to 5.5 V and provides up to 600 mA of load current.

Output voltages from 1.2 V to 3.4 V are possible depending on

the model. Using an advanced proprietary architecture, it

provides high power supply rejection and ultralow noise,

achieving excellent line and load transient response with only a

10 μF ceramic output capacitor.

The ADM7155 is available in four models that optimize power

dissipation and PSRR performance as a function of input and

output voltage. See Table 9 and Table 10 for selection guides.

The ADM7155 regulator typical output noise is 0.9 μV rms from

100 Hz to 100 kHz for fixed output voltage options and 1.5 nV/√Hz

for noise spectral density from 10 kHz to 1 MHz.

The ADM7155 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 600 mA of load current in a small, low

profile footprint.

Table 1. Related Devices

Model

Input

Voltage

Output

ADM7150ACP 4.5 V to 16 V

800 mA

Fixed

8-Lead LFCSP

ADM7150ARD 4.5 V to 16 V

800 mA

Fixed

8-Lead SOIC

ADM7151ACP 4.5 V to 16 V

800 mA

Adj

8-Lead LFCSP

ADM7151ARD 4.5 V to 16 V

800 mA

Adj

8-Lead SOIC

ADM7154ACP 2.3 V to 5.5 V 600 mA

Fixed

8-Lead LFCSP

ADM7154ARD 2.3 V to 5.5 V 600 mA

Fixed

8-Lead SOIC