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ADP2441

更新时间： 2024-11-23 12:51:15
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
32页 1912K
描述
36 V,1 A, Synchronous, Step-Down DC-to-DC Regulator

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36 V,1 A, Synchronous,  
Step-Down DC-to-DC Regulator  
ADP2441  
Data Sheet  
FEATURES  
TYPICAL CIRCUIT CONFIGURATION  
C3  
Wide input voltage range of 4.5 V to 36 V  
Low minimum on time of 50 ns  
Maximum load current of 1 A  
C
C4  
BST  
V
OUT  
High efficiency of up to 94%  
R
TOP  
Adjustable output down to 0.6 V  
1% output voltage accuracy  
Adjustable switching frequency of 300 kHz to 1 MHz  
Pulse skip mode at light load for power saving  
Precision enable input pin  
V
IN  
FB  
VIN  
R
V
BOTTOM  
OUT  
COMP ADP2441  
SW  
C
C
OUT  
IN  
V
IN  
EN  
R
PGND  
COMP  
Open-drain power good  
C
COMP  
External soft start with tracking  
Overcurrent-limit protection  
R
FREQ  
Shutdown current of less than 15 μA  
UVLO and thermal shutdown  
Figure 1.  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
12-lead, 3 mm × 3 mm LFCSP package  
V
= 5V  
OUT  
V
= 12V  
OUT  
APPLICATIONS  
Point of load applications  
Distributed power systems  
Industrial control supplies  
Standard rail conversion to 24 V/12 V/5 V/3.3 V  
V
= 3.3V  
OUT  
V
= 24V  
IN  
GENERAL DESCRIPTION  
fSW = 300kHz  
The ADP2441 is a constant frequency, current mode control,  
synchronous, step-down dc-to-dc regulator that is capable of  
driving loads up to 1 A with excellent line and load regulation  
characteristics. The ADP2441 operates with a wide input voltage  
range of 4.5 V to 36 V, which makes it ideal for regulating power  
from a wide variety of sources. In addition, the ADP2441 has  
very low minimum on time (50 ns) and is, therefore, suitable for  
applications requiring a very high step-down ratio.  
0.02  
0.2  
LOAD (A)  
1
Figure 2. Efficiency vs. Load Current, VIN = 24 V  
The output voltage can be adjusted from 0.6 V to 0.9 V × VIN.  
High efficiency is obtained with integrated low resistance  
N-channel MOSFETs for both high-side and low-side devices.  
The ADP2441 uses hiccup mode to protect the IC from short  
circuits or from overcurrent conditions on the output. The external  
programmable soft start limits inrush current during startup for  
a wide variety of load capacitances. Other key features include  
tracking, input undervoltage lockout (UVLO), thermal shutdown  
(TSD), and precision enable (EN), which can also be used as a  
logic level shutdown input.  
The switching frequency is adjustable from 300 kHz to 1 MHz with  
an external resistor. The ADP2441 also has an accurate power-good  
(PGOOD) open-drain output signal.  
At light load conditions, the regulator operates in pulse skip  
mode by skipping pulses and reducing switching losses to improve  
energy efficiency. In addition, at medium to heavy load conditions,  
the regulator operates in fixed frequency pulse-width modulation  
(PWM) mode to reduce electromagnetic interference (EMI).  
The ADP2441 is available in a 3 mm × 3 mm, 12-lead LFCSP  
package and is rated for a junction temperature range of −40°C  
to +125°C.  
Rev. A  
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  
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  
Technical Support  
©2012 Analog Devices, Inc. All rights reserved.  
www.analog.com  
 
 
 
 
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