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ADP3000AN-3.3 PDF预览

ADP3000AN-3.3

更新时间： 2024-11-22 23:27:59
品牌 Logo 应用领域
亚德诺 - ADI 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
12页 344K
描述
Voltage-Mode SMPS Controller

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ADP3000AN-3.3 数据手册

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Micropower Step-Up/Step-Down  
Fixed 3.3 V, 5 V, 12 V and Adjustable  
High Frequency Switching Regulator  
a
ADP3000  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Operates at Supply Voltages from 2 V to 30 V  
Works in Step-Up or Step-Down Mode  
Very Few External Components Required  
High Frequency Operation Up to 400 kHz  
Low Battery Detector on Chip  
User Adjustable Current Limit  
Fixed and Adjustable Output Voltage  
8-Pin DIP and SO-8 Package  
SET  
A1  
A0  
V
IN  
I
GAIN BLOCK/  
ERROR AMP  
LIM  
SW1  
1.245V  
REFERENCE  
400kHz  
OSCILLATOR  
Small Inductors and Capacitors  
DRIVER  
SW2  
COMPARATOR  
APPLICATIONS  
ADP3000  
Notebook, Palmtop Computers  
Cellular Telephones  
Hard Disk Drives  
R1  
R2  
GND  
SENSE  
Portable Instruments  
Pagers  
6.8µH  
IN5817  
V
IN  
3.3V @  
180mA  
2V–3.2V  
100µF  
10V  
120Ω  
GENERAL DESCRIPTION  
1
2
The ADP3000 is a versatile step-up/step-down switching  
regulator that operates from an input supply voltage of 2 V to  
12 V in step-up mode and up to 30 V in step-down mode.  
I
V
LIM  
IN  
SW1  
3
8
ADP3000-3.3V  
The ADP3000 operates in Pulse Frequency Mode (PFM) and  
consumes only 500 µA, making it highly suitable for applica-  
tions that require low quiescent current.  
FB  
(SENSE)  
C1  
100µF  
10V  
+
GND  
5
SW2  
4
The ADP3000 can deliver an output current of 100 mA at  
3 V from a 5 V input in step-down configuration and 180 mA at  
3.3 V from a 2 V input in step-up configuration.  
C1, C2: AVX TPS D107 M010R0100  
L1: SUMIDA CD43-6R8  
The auxiliary gain amplifier can be used as a low battery detector,  
linear regulator undervoltage lockout or error amplifier.  
Figure 1. Typical Application  
The ADP3000 operates at 400 kHz switching frequency. This  
allows the use of small external components (inductors and  
capacitors), making the device very suitable for space constrained  
designs.  
V
IN  
R
120Ω  
5V–6V  
C1  
100µF  
10V  
LIM  
1
2
3
I
V
SW1  
LIM  
IN  
8
4
FB  
ADP3000  
L1  
10µH  
V
SW2  
OUT  
R2  
GND  
5
3V  
100mA  
150kΩ  
1%  
CL  
100µF  
10V  
+
D1  
1N5818  
R1  
110kΩ  
1%  
C1, C2: AVX TPS D107 M010R0100  
L1: SUMIDA CD43-100  
Figure 2. Step-Down Mode Operation  
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1997  
1234567...12

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