1.2 A, Ultralow Noise,
High PSRR, RF Linear Regulator
ADP7156
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
Input voltage range: 2.3 V to 5.5 V
16 standard voltages between 1.2 V and 3.3 V available
Maximum load current: 1.2 A
ADP7156
V
= 3.8V
V
= 3.3V
IN
OUT
C
VIN
VOUT
C
10µF
IN
OUT
10µF
VOUT_SENSE
Low noise
ON
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: 1.7 nV/√Hz from 10 kHz to 1 MHz
Power supply rejection ratio (PSRR)
EN
REF
OFF
C
REF
1µF
BYP
C
BYP
REF_SENSE
1µF
80 dB from 1 kHz to 100 kHz; 60 dB at 1 MHz, VOUT = 3.3 V,
VREG
C
REG
1µF
VIN = 4.0 V
GND (EPAD)
Dropout voltage: 120 mV typical at IOUT = 1.2 A, VOUT = 3.3 V
Initial accuracy: 0.6ꢀ at ILOAD = 10 mA
Initial accuracy over line, load, and temperature: 1.5ꢀ
Quiescent current: IGND = 4.0 mA at no load, 7 mA at 1.2 A
Low shutdown current: 0.2 ꢁA
Figure 1.
Table 1. Related Devices
Stable with a 10 μF ceramic output capacitor
10-lead, 3 mm × 3 mm LFCSP and 8-lead SOIC packages
Precision enable
Input
Voltage
Output
Fixed/
Model
Current Adj1
Package
ADP7158,
ADP7159
2.3 V to 5.5 V
2 A
Fixed/
Adj
10-lead LFCSP/
8-lead SOIC
Supported by ADIsimPower tool
APPLICATIONS
ADP7157
2.3 V to 5.5 V
4.5 V to 16 V
2.3 V to 5.5 V
2.2 V to 5.5 V
1.2 A
Fixed/
Adj
Fixed/
Adj
Fixed/
Adj
Fixed
10-lead LFCSP/
8-lead SOIC
8-lead LFCSP/
8-lead SOIC
8-lead LFCSP/
8-lead SOIC
6-lead LFCSP/
5-lead TSOT
Regulation to noise sensitive applications: phase-locked
loops (PLLs), voltage controlled oscillators (VCOs), and
PLLs with integrated VCOs
Communications and infrastructure
Backhaul and microwave links
ADM7150,
ADM7151
ADM7154,
ADM7155
800 mA
600 mA
200 mA
ADM7160
GENERAL DESCRIPTION
1 Adj means adjustable.
The ADP7156 is a linear regulator that operates from 2.3 V to 5.5 V
and provides up to 1.2 A of output current. 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.
1k
C
C
C
C
= 1µF
BYP
BYP
BYP
BYP
= 10µF
= 100µF
= 1000µF
100
10
1
There are 16 standard output voltages for the ADP7156. The
following voltages are available from stock: 1.2 V, 1.8 V, 2.0 V,
2.5 V, 2.8 V, 3.0 V and 3.3 V. Additional voltages available by
special order are 1.3 V, 1.5 V, 1.6 V, 2.2 V, 2.6 V, 2.7 V, 2.9 V,
3.1 V, and 3.2 V.
The ADP7156 regulator typical output noise is 0.9 ꢀV rms
from 100 Hz to 100 kHz and 1.7 nV/√Hz for noise spectral
density from 10 kHz to 1 MHz. The ADP7156 is available in a
10-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
1.2 A of output current in a small, low profile footprint.
0.1
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 2. Noise Spectral Density at Different Values of CBYP, VOUT = 3.3 V
Rev. A
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