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ADP2387

更新时间： 2024-11-24 02:52:07
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亚德诺 - ADI /
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25页 571K
描述
20 V, 6 A, Synchronous, Step-Down DC-to-DC Regulator

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20 V, 6 A, Synchronous, Step-Down  
DC-to-DC Regulator  
Data Sheet  
ADP2387  
FEATURES  
TYPICAL APPLICATIONS CIRCUIT  
Input voltage range: 4.5 V to 20 V  
Integrated MOSFET: 44 mΩ typical/11 mΩ typical  
Reference voltage: 0.6 V 1%  
ADP2387  
BST  
V
PVIN  
EN  
IN  
C
BST  
L
C
IN  
SW  
V
OUT  
Continuous output current: 6 A  
C
OUT  
PGOOD  
ILIM  
RT  
R
TOP  
Programmable current-limit threshold  
Programmable switching frequency: 200 kHz to 1400 kHz  
Precision enable and power good  
External compensation  
Internal soft start with external adjustable option  
Startup into a precharged output  
FB  
COMP  
SS  
R
ILIM  
R
T
R
C
R
VREG  
BOT  
C
C
VREG  
GND PGND  
C
C
SS  
Supported by ADIsimPower design tool  
Figure 1.  
APPLICATIONS  
Communications infrastructure  
Networking and servers  
Industrial and instrumentation  
Healthcare and medical  
Intermediate power rail conversion  
DC-to-dc point of load applications  
GENERAL DESCRIPTION  
The ADP2387 is a synchronous step-down, dc-to-dc regulator with  
an integrated 44 mΩ, high-side power, metal oxide semiconductor  
field effect transistor (MOSFET) and an 11 mΩ, synchronous  
rectifier MOSFET to provide a high efficiency solution in a  
compact 4 mm × 4 mm LFCSP. This device uses a peak current  
mode, constant frequency pulse-width modulation (PWM)  
control scheme for excellent stability and transient response.  
The switching frequency of the ADP2387 can be programmed  
between 200 kHz to 1400 kHz.  
Other key features include undervoltage lockout (UVLO),  
overvoltage protection (OVP), overcurrent protection (OCP),  
short-circuit protection (SCP), and thermal shutdown (TSD).  
The ADP2387 operates over the −40°C to +125°C junction  
temperature range and is available in a 24-lead, 4 mm × 4 mm  
LFCSP.  
100  
95  
90  
85  
80  
75  
70  
65  
60  
The ADP2387 requires minimal external components and operates  
from an input voltage of 4.5 V to 20 V. The output voltage can  
be adjusted from 0.6 V to 90% of the input voltage and delivers  
up to 6 A of continuous current. Each IC draws less than 110 µA  
current from the input source when it is disabled.  
This regulator targets high performance applications that require  
high efficiency and design flexibility. External compensation  
and an adjustable soft start function provide design flexibility.  
The power-good output and precision enable input provide  
simple and reliable power sequencing. The programmable  
current-limit function allows the inductor to be optimized by  
output current.  
V
V
V
= 5.0V  
= 3.3V  
= 1.2V  
OUT  
OUT  
OUT  
55  
50  
0
1
2
3
4
5
6
OUTPUT CURRENT (A)  
Figure 2. Efficiency vs. Output Current, VIN = 12 V, fSW = 300 kHz  
Rev. C  
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 ©2016–2017 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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