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LTC3672B-2

更新时间： 2023-12-20 18:44:27
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
12页 157K
描述
采用 2mm x 2mm DFN 封装、具双路 150mA LDO 的单片式固定输出 400mA 降压型稳压器

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中文翻译

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LTC3672B-2 数据手册

 浏览型号LTC3672B-2的Datasheet PDF文件第2页浏览型号LTC3672B-2的Datasheet PDF文件第3页浏览型号LTC3672B-2的Datasheet PDF文件第4页浏览型号LTC3672B-2的Datasheet PDF文件第5页浏览型号LTC3672B-2的Datasheet PDF文件第6页浏览型号LTC3672B-2的Datasheet PDF文件第7页 
LTC3672B-2  
Monolithic Fixed-Output  
400mA Buck Regulator with Dual  
150mA LDOs in 2mm × 2mm DFN  
FEATURES  
DESCRIPTION  
The LTC®3672B-2 is a triple power supply composed of  
a 400mA synchronous buck regulator and two 150mA  
low-dropoutlinearregulators(LDOs).Constant-frequency  
2.25MHzoperationismaintaineddowntoverylightloads.  
The input supply range of 2.9V to 5.5V is especially well-  
suited for single-cell Lithium-Ion and Lithium-Polymer  
applications, and for powering low voltage ASICs from  
3.3V or 5V rails.  
n
Triple Output Supply From a Single 2.9V to 5.5V Input  
Buck DC/DC: Fixed 1.2V Output, Up to 400mA  
LDO1: Fixed 2.8V Output, Up to 150mA  
LDO2: Fixed 1.8V Output, Up to 150mA  
2.5ꢀ ꢁeꢂerence Accuracy  
Constant-Frequency 2.25MHz Operation  
Minimum External Component Count  
Current Mode Operation for Excellent Line and Load  
Transient Response  
n
n
n
n
n
n
n
The LTC3672B-2 regulates 1.2V at the buck output, 2.8V  
at the LDO1 output, and 1.8V at the LDO2 output. Exter-  
nal component count is minimal—all that is needed is a  
single inductor, an input capacitor, and output capacitors  
for each of the three outputs. Control loop compensation  
is internal to the LTC3672B-2.  
n
n
Internal Soft-Start for Each Output  
Single Enable Pin Turns On/Shuts Down All Three  
Outputs  
n
Tiny 2mm × 2mm × 0.75mm DFN Package  
APPLICATIONS  
The LTC3672B-2 is available in a 2mm × 2mm × 0.75mm  
8-Lead DFN package.  
n
DMB and DVB-H Cellphones  
n
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Handheld Products (PDA, PMP, GPS)  
n
Multivoltage Power for Digital Logic, I/O, FPGAs,  
CPLDs, ASICs, CPUs, and RF Chipsets  
TYPICAL APPLICATION  
Buck DC/DC Eꢂficiency vs Buck Load  
100  
V
IN  
2.9V TO 5.5V  
95  
4.7μH  
V
1.2V  
400mA  
OUT1  
V
V
IN1  
SW  
2.2μF  
IN  
90  
85  
80  
75  
70  
65  
60  
V
= 2.9V  
IN  
4.7μF  
GND BUCKOUT  
LTC3672B-2  
V
= 3.6V  
IN  
V
OUT2  
ENABLE  
INPUT  
LDO1  
2.8V, UP TO 150mA  
(SUBJECT TO DROPOUT  
LIMITATIONS)  
ENALL  
1μF  
1μF  
V
= 5.5V  
IN  
V
1.8V  
150mA  
OUT3  
LDO2  
3672B2 TA01  
200 250  
0
50 100 150  
300 350 400  
I
(mA)  
LOAD  
3672B2 TA01b  
3672b2fa  
1
1234567...12

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