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ADP5023

更新时间： 2024-02-07 21:07:39
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亚德诺 - ADI /
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28页 814K
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Dual 3 MHz, 800 mA Buck

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ADP5023 数据手册

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Dual 3 MHz, 800 mA Buck  
Regulators with One 300 mA LDO  
Data Sheet  
ADP5023  
FEATURES  
GENERAL DESCRIPTION  
Main input voltage range: 2.3 V to 5.5 V  
Two 800 mA buck regulators and one 300 mA LDO  
24-lead, 4 mm × 4 mm LFCSP package  
Regulator accuracy: 3ꢀ  
The ADP5023 combines two high performance buck regulators  
and one low dropout (LDO) regulator in a small, 24-lead 4 mm ×  
4 mm LFCSP to meet demanding performance and board space  
requirements.  
Factory programmable or external adjustable VOUTx  
3 MHz buck operation with forced PWM and auto PWM/PSM  
modes  
BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V  
LDO: output voltage range from 0.8 V to 5.2 V  
LDO: input supply voltage from 1.7 V to 5.5 V  
LDO: high PSRR and low output noise  
The high switching frequency of the buck regulators enables tiny  
multilayer external components and minimizes the board space.  
When the MODE pin is set high, the buck regulators operate in  
forced PWM mode. When the MODE pin is set low, the buck  
regulators operate in PWM mode when the load current is  
above a predefined threshold. When the load current falls below  
a predefined threshold, the regulator operates in power save  
mode (PSM) improving the light-load efficiency.  
APPLICATIONS  
Power for processors, ASIC, FPGAs, and RF chipsets  
Portable instrumentation and medical devices  
Space constrained devices  
The two bucks operate out of phase to reduce the input capaci-  
tor requirement. The low quiescent current, low dropout voltage,  
and wide input voltage range of the ADP5023 LDO extends the  
battery life of portable devices. The ADP5023 LDO maintains  
power supply rejection greater than 60 dB for frequencies as  
high as 10 kHz while operating with a low headroom voltage.  
Regulators in the ADP5023 are activated though dedicated  
enable pins. The default output voltages can be externally set in  
the adjustable version or factory programmable to a wide range  
of preset values in the fixed voltage version.  
TYPICAL APPLICATION CIRCUIT  
AVIN  
HOUSEKEEPING  
C
0.1µF  
FILT  
VOUT1  
L1 1µH  
VIN1  
SW1  
FB1  
2.3V TO  
5.5V  
V
AT  
OUT1  
800mA  
C1  
R1  
R2  
BUCK1  
MODE  
4.7µF  
C5  
10µF  
PGND1  
ON  
EN1  
EN1  
OFF  
PWM  
MODE  
PSM/PWM  
VOUT2  
VIN2  
EN2  
MODE  
L2 1µH  
SW2  
FB2  
V
AT  
AT  
OUT2  
C2  
4.7µF  
800mA  
R3  
R4  
BUCK2  
C6  
10µF  
EN2  
EN3  
ON  
PGND2  
OFF  
EN3  
VOUT3  
FB3  
V
OUT3  
300mA  
VIN3  
R5  
R6  
1.7V TO  
5.5V  
LDO  
C7  
1µF  
C3  
1µF  
ADP5023  
AGND  
Figure 1.  
Rev. A  
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 www.analog.com  
Fax: 781.461.3113 ©2011-2012 Analog Devices, Inc. All rights reserved.  
 
 
 
 
 
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