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ADP3309ARTZ-2.9-R7

更新时间： 2024-11-26 12:47:59
品牌 Logo 应用领域
亚德诺 - ADI 线性稳压器IC调节器电源电路光电二极管输出元件
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12页 348K
描述
anyCAP 100 mA Low Dropout Linear Regulator

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ADP3309ARTZ-2.9-R7 数据手册

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anyCAP® 100 mA  
Low Dropout Linear Regulator  
ADP3309  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
1.2ꢀ accuracy over line and load regulations @ 25°C  
Ultralow dropout voltage: 120 mV typical @ 100 mA  
Requires only COUT = 0.47 μF for stability  
anyCAP LDOs are stable with all types of capacitors  
(including MLCC)  
ADP3309  
Q1  
IN  
OUT  
THERMAL  
PROTECTION  
R1  
R2  
CC  
ERR/NC  
g
Q2  
DRIVER  
m
SD  
Current and thermal limiting  
Low noise  
BANDGAP  
REF  
Low shutdown current: 1 μA  
2.8 V to 12 V supply range  
GND  
Figure 1.  
−20°C to +85°C ambient temperature range  
Several fixed voltage options  
Ultrasmall 5-lead SOT-23 package  
Excellent line and load regulations  
APPLICATIONS  
Cellular telephones  
Notebook, palmtop computers  
Battery-powered systems  
PCMCIA regulator  
Bar code scanners  
Camcorders, cameras  
GENERAL DESCRIPTION  
The ADP3309 is a member of the ADP330x family of precision  
low dropout anyCAP voltage regulators. It is pin-for-pin and  
functionally compatible with National’s LP2981, but offers  
performance advantages. The ADP3309 stands out from  
conventional LDOs with a novel architecture and an enhanced  
process. Its patented design requires only a 0.47 μF output  
capacitor for stability. This device is stable with any type of  
capacitor regardless of its equivalent series resistance (ESR)  
value, including ceramic types for space restricted applications.  
The ADP3309 achieves 1.2% accuracy at room temperature  
and 2.2% overall accuracy over temperature, line, and load  
regulations. The dropout voltage of the ADP3309 is only  
120 mV (typical) at 100 mA. This device also includes a current  
limit and a shutdown feature. In shutdown mode, the ground  
current is reduced to ~1 μA.  
The ADP3309 operates with a wide input voltage range from  
2.8 V to 12 V and delivers a load current in excess of 100 mA.  
The ADP3309 anyCAP LDO offers a wide range of output  
voltages.  
4
1
ERR/NC  
ADP3309-3.3  
V
V
= 3.3V  
OUT  
5
IN  
IN  
OUT  
+
+
–
C2  
0.47µF  
C1  
0.47µF  
–
3
2
ON  
OFF  
GND  
SD  
Figure 2. Typical Application Circuit  
Rev. C  
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  
©2006 Analog Devices, Inc. All rights reserved.  
 
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