800 mA Ultralow Noise,
High PSRR, RF Linear Regulator
ADM7150
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
ADM7150
Input voltage range: 4.5 V to 16 V
Maximum output current: 800 mA
Low noise
V
= 6.2V
V
C
= 5.0V
IN
OUT
VIN
VOUT
C
IN
10µF
OUT
10µF
ON
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 typical from 10 kHz to 1 MHz
Power supply rejection ratio (PSRR) at 400 mA load
>90 dB from 1 kHz to 100 kHz, VOUT = 5 V
>60 dB at 1 MHz, VOUT = 5 V
EN
REF
REF_SENSE
GND
C
REF
1µF
OFF
BYP
C
1µF
BYP
VREG
C
REG
10µF
Figure 1. 5 V Output Circuit
Dropout voltage: 0.6 V at VOUT = 5 V, 800 mA load
Initial voltage accuracy: ±1%
Voltage accuracy over line, load and temperature: ±±%
Quiescent current (IGND): 4.3 mA at no load
Low shutdown current: 0.1 µA
Stable with a 10 µF ceramic output capacitor
Fixed output voltage options: 1.8 V, ±.8 V, 3.0 V, 3.3 V, 4.5 V,
4.8 V, and 5.0 V (16 outputs between 1.5 V and 5.0 V are
available)
Exposed pad 8-lead LFCSP and 8-lead SOIC packages
APPLICATIONS
Regulated power noise sensitive applications
RF mixers, phase-locked loops (PLLs), voltage-controlled
oscillators (VCOs), and PLLs with integrated VCOs
Communications and infrastructure
Cable digital-to-analog converter (DAC) drivers
Backhaul and microwave links
GENERAL DESCRIPTION
The ADM7150 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 output noise (<1.7 nV√Hz), and achieves excellent line and
load transient response with a 10 µF ceramic output capacitor.
footprint. See the ADM7151 adjustable LDO to generate additional
output voltages.
100k
C
C
C
C
= 1µF
BYP
BYP
BYP
BYP
= 10µF
= 100µF
= 1mF
10k
1k
100
10
1
The ADM7150 is available in 1.8 V, 2.8 V, 3.0 V, 3.3 V, 4.5 V,
4.8 V, and 5.0 V fixed outputs. In addition, 16 fixed output
voltages between 1.5 V and 5.0 V are available upon request.
The ADM7150 regulator typical output noise is 1.0 µV rms
from 100 Hz to 100 kHz for fixed output voltage options, and
the noise spectral density is 1.7 nV/√Hz from 10 kHz to 1 MHz.
The ADM7150 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
0.1
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 2. Noise Spectral Density (NSD) vs. Frequency for Various CBYP
Rev. 0
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