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ADP122

更新时间： 2024-11-23 06:36:23
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
20页 617K
描述
5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator

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ADP122 数据手册

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5.5 V Input, 300 mA, Low Quiescent  
Current, CMOS Linear Regulator  
ADP122/ADP123  
TYPICAL APPLICATION CIRCUIT  
FEATURES  
Input voltage supply range: 2.3 V to 5.5 V  
300 mA maximum output current  
Fixed and adjustable output voltage versions  
Very low dropout voltage: 85 mV at 300 mA load  
Low quiescent current: 45 μA at no load  
Low shutdown current: <1 μA  
V
= 2.3V TO 5.5V  
V
= 1.8V  
OUT  
IN  
1
5
VIN  
VOUT  
C
C
IN  
OUT  
1µF  
ADP122  
1µF  
2
3
GND  
ON  
4
EN  
NC  
OFF  
Initial accuracy: 1ꢀ accuracy  
Figure 1. ADP122 with Fixed Output Voltage  
Up to 31 fixed-output voltage options available from  
1.75 V to 3.3 V  
Adjustable-output voltage range  
0.8 V to 5.0 V (ADP123)  
V
= 2.3V TO 5.5V  
V
= 0.5V(1 + R1/R2)  
IN  
OUT  
R1  
1
5
VIN  
VOUT  
ADJ  
C
C
IN  
OUT  
1µF  
ADP123  
Excellent PSRR performance: 60 dB at 100 kHz  
Excellent load/line transient response  
Optimized for small 1.0 ꢁF ceramic capacitors  
Current limit and thermal overload protection  
Logic controlled enable  
1µF  
2
3
GND  
ON  
4
EN  
OFF  
R2  
Compact, 5-lead TSOT package  
Figure 2. ADP 123 with Adjustable Output Voltage  
APPLICATIONS  
Digital camera and audio devices  
Portable and battery-powered equipment  
Automatic meter reading (AMR) meters  
GPS and location management units  
Medical instrumentation  
Point-of-sale equipment  
GENERAL DESCRIPTION  
The ADP122/ADP123 are low quiescent current, low dropout  
linear regulators. They are designed to operate from an input  
voltage between 2.3 V and 5.5 V and to provide up to 300 mA of  
output current. The low 85 mV dropout voltage at a 300 mA load  
improves efficiency and allows operation over a wide input  
voltage range.  
The ADP122/ADP123 are specifically designed for stable operation  
with tiny 1 ꢀF ceramic input and output capacitors to meet the  
requirements of high performance, space constrained applications.  
The ADP122/ADP123 have an internal soft start that gives a  
constant start-up time of 350 ꢀs. Short-circuit protection and  
thermal overload protection circuits prevent damage in adverse  
conditions. The ADP122/ADP123 are available in a tiny, 5-lead  
TSOT package for the smallest footprint solution to meet a  
variety of portable applications.  
The low 170 μA of quiescent current at full load makes the ADP122  
ideal for battery-operated portable equipment.  
The ADP122 is capable of 31 fixed output voltages from 1.75 V  
to 3.3 V. The ADP123 is the adjustable version of the device and  
allows the output voltage to be set between 0.8 V and 5.0 V by  
an external voltage divider.  
Rev. 0  
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  
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.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2009 Analog Devices, Inc. All rights reserved.  
 
 
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