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LT3470AIDDB-TRPBF

更新时间： 2024-11-30 05:43:31
品牌 Logo 应用领域
凌特 - Linear 调节器二极管
页数 文件大小 规格书
20页 208K
描述
Micropower Buck Regulator with Integrated Boost and Catch Diodes

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中文翻译

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LT3470AIDDB-TRPBF 数据手册

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LT3470A  
Micropower Buck Regulator  
with Integrated Boost and  
Catch Diodes  
FEATURES  
DESCRIPTION  
The LT®3470A is a micropower step-down DC/DC con-  
verter that integrates a 440mA power switch, catch diode  
and boost diode into low profile 2mm × 3mm DFN  
package. The LT3470A combines Burst Mode and  
continuous operation to allow the use of tiny inductor  
and capacitors while providing a low ripple output to  
loads of up to 250mA.  
n
Low Quiescent Current: 35μA at 12V to 3.3V  
IN  
OUT  
n
Integrated Boost and Catch Diodes  
n
Input Range: 4V to 40V  
n
3.3V at 250mA from 4V to 40V Input  
n
5V at 250mA from 5.7V to 40V Input  
n
Low Output Ripple: <10mV  
n
<1μA in Shutdown Mode  
n
Output Voltage: 1.25V to 16V  
With its wide input range of 4V to 40V, the LT3470A can  
regulateawidevarietyofpowersources,from2-cellLi-Ion  
batteries to unregulated wall transformers and lead-acid  
batteries. Quiescent current in regulation is just 35μA in  
a typical application while a zero current shutdown mode  
disconnects the load from the input source, simplifying  
powermanagementinbattery-poweredsystems.Fastcur-  
rent limiting and hysteretic control protects the LT3470A  
and external components against shorted outputs, even  
at 40V input. The LT3470A has higher output current and  
improved start-up and dropout performance compared  
to the LT3470.  
n
Hysteretic Mode Control  
– Low Ripple Burst Mode® Operation at Light Loads  
– Continuous Operation at Higher Loads  
2
n
n
Solution Size as Small as 50mm  
Low Profile (0.75mm) 2mm × 3mm Thermally  
Enhanced 8-Lead DFN Package  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Power for Portable Products  
n
Distributed Supply Regulation  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode  
is a registered trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
n
Industrial Supplies  
n
Wall Transformer Regulation  
TYPICAL APPLICATION  
Efficiency and Power Loss vs Load Current  
90  
80  
70  
60  
50  
40  
30  
20  
10  
1000  
100  
10  
V
= 12V  
IN  
V
IN  
5.7V TO 40V  
0.22μF  
33μH  
V
BOOST  
IN  
LT3470A  
SHDN  
V
OUT  
5V  
OFF ON  
2.2μF  
SW  
250mA  
BIAS  
604k  
1%  
22pF  
FB  
22μF  
GND  
200k  
1%  
1
3470a TA01  
0.1  
0.1  
1
10  
100  
300  
LOAD CURRENT (mA)  
3470a TA02  
3470afa  
1
1234567...20

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