600 mA, Ultralow Noise,
High PSRR, RF Linear Regulator
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
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
Dropout voltage: 120 mV typical at VOUT = 3.3 V, IOUT = 600 mA
Initial accuracy: ±0.5%
Accuracy over line, load, and temperature: −2.0% (minimum),
Quiescent current, IGND = 4 mA at no load
Low shutdown current: 0.2 μA
Stable with a 10 µF ceramic output capacitor
8-lead LFCSP and 8-lead SOIC packages
Supported by ADIsimPower tool
Regulation to noise sensitive applications: PLLs, VCOs, and
PLLs with integrated VCOs
Communications and infrastructure
Backhaul and microwave links
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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
TYPICAL APPLICATION CIRCUIT
VIN = 3.5V
VOUT = 3.0V
REF = 1.2V
VOUT = 1.2V × (R1 + R2)/R2
1kΩ < R2 < 200kΩ
Figure 1. Regulated 3.0 V Output from 3.5 V Input
0.1 1 10 100 1k 10k 100k 1M
Figure 2. Noise Spectral Density for Different Values of CBYP
Table 1. Related Devices
ADM7150ACP 4.5 V to 16 V
ADM7150ARD 4.5 V to 16 V
ADM7151ACP 4.5 V to 16 V
ADM7151ARD 4.5 V to 16 V
ADM7154ACP 2.3 V to 5.5 V
ADM7154ARD 2.3 V to 5.5 V
1 Adj means adjustable.
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