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ADM7155

更新时间： 2024-02-09 09:56:40
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亚德诺 - ADI /
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High PSRR, RF Linear Regulator

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ADM7155 数据手册

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1.2 A, Ultralow Noise,  
High PSRR, RF Linear Regulator  
ADP7157  
Data Sheet  
FEATURES  
Input voltage range: 2.3 V to 5.5 V  
Adjustable output voltage range (VOUT): 1.2 V to 3.3 V  
Maximum load current: 1.2 A  
Low noise  
0.9 µV rms typical output noise from 100 Hz to 100 kHz  
1.6 µV rms typical output 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)  
82 dB from 1 kHz to 100 kHz  
TYPICAL APPLICATION CIRCUIT  
ADP7157  
V
= 3.8V  
V
= 3.3V  
IN  
OUT  
VIN  
VOUT  
VOUT_SENSE  
REF  
C
10µF  
C
OUT  
10µF  
IN  
ON  
OFF  
EN  
C
REF  
1µF  
R1  
BYP  
C
BYP  
1µF  
V
= 1.2V × (R1 + R2)/R2  
OUT  
REF_SENSE  
R2  
1kΩ < R2 < 200kΩ  
VREG  
C
REG  
1µF  
55 dB at 1 MHz  
GND  
Dropout voltage: 120 mV typical at IOUT = 1.2 A, VOUT = 3.3 V  
Initial accuracy: 0.6% at ILOAD = 10 mA  
Accuracy over line, load, and temperature: 1.5%  
Figure 1. Regulated 3.3 V Output from a 3.8 V Input  
Operating supply current (IGND  
4.0 mA typical at 0 µA  
)
7.0 mA typical at 1.2 A  
Low shutdown current: 0.2 μA typical  
Stable with a 10 µF ceramic output capacitor  
10-lead, 3 mm × 3 mm LFCSP and 8-lead SOIC packages  
Precision enable  
Table 1. Related Devices  
Input  
Output  
Current  
Fixed/  
Adjustable  
Supported by ADIsimPower tool  
Model  
Voltage  
Package  
APPLICATIONS  
2.3 V to  
5.5 V  
2 A  
Fixed  
10-lead LFCSP/  
8-lead SOIC  
ADP7159,  
ADP7158  
ADP7156  
Regulation to noise sensitive applications: phase-locked  
loops (PLLs), voltage controlled oscillators (VCOs), and  
PLLs with integrated VCOs  
2.3 V to  
5.5 V  
1.2 A  
Fixed/  
Adjustable  
10-lead LFCSP/  
8-lead SOIC  
ADM7150, 4.5 V to  
ADM7151 16 V  
ADM7154, 2.3 V to  
800 mA  
600 mA  
200 mA  
Fixed/  
Adjustable  
Fixed/  
Adjustable  
8-lead LFCSP/  
8-lead SOIC  
8-lead LFCSP/  
8-lead SOIC  
6-lead LFCSP/  
5-lead TSOT  
Communications and infrastructure  
Backhaul and microwave links  
ADM7155  
5.5 V  
GENERAL DESCRIPTION  
ADM7160  
2.2 V to  
5.5 V  
Fixed  
The ADP7157 is an adjustable linear regulator that operates from  
2.3 V to 5.5 V and provides up to 1.2 A of output current. Output  
voltages from 1.2 V to 3.3 V are possible depending on the model.  
Using an advanced proprietary architecture, the device provides  
high power supply rejection and ultralow noise, achieving excellent  
line and load transient response with only a 10 µF ceramic  
output capacitor.  
1k  
100  
10  
C
= 1µF  
BYP  
BYP  
BYP  
BYP  
C
C
C
= 10µF  
= 100µF  
= 1000µF  
The ADP7157 is available in four models that optimize power  
dissipation and PSRR performance as a function of the input  
and output voltage. See Table 9 and Table 10 for selection guides.  
1
The typical output noise the ADP7157 regulator is 0.9 μV rms from  
100 Hz to 100 kHz and 1.7 nV/√Hz for noise spectral density from  
10 kHz to 1 MHz. The ADP7157 is available in 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  
Document Feedback  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rightsof third parties that may result fromits use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Technical Support  
©2016 Analog Devices, Inc. All rights reserved.  
www.analog.com  
 
 
 
 
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