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LT1933

更新时间: 2024-09-25 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
20页 362K
描述
采用 SOT-23 和 DFN 封装的 600mA、500kHz 降压型开关稳压器

LT1933 数据手册

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LT1933  
600mA, 500kHz Step-Down  
Switching Regulator in  
SOT-23 and DFN Packages  
FEATURES  
DESCRIPTION  
The LT®1933 is a current mode PWM step-down DC/DC  
converter with an internal 0.75A power switch, packaged  
in a tiny 6-lead SOT-23. The wide input range of 3.6V  
to 36V makes the LT1933 suitable for regulating power  
from a wide variety of sources, including unregulated wall  
transformers, 24V industrial supplies and automotive  
batteries. Its high operating frequency allows the use of  
tiny, low cost inductors and ceramic capacitors, resulting  
in low, predictable output ripple.  
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Wide Input Range: 3.6V to 36V  
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5V at 600mA from 16V to 36V Input  
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3.3V at 600mA from 12V to 36V Input  
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5V at 500mA from 6.3V to 36V Input  
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3.3V at 500mA from 4.5V to 36V Input  
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Fixed Frequency 500kHz Operation  
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Uses Tiny Capacitors and Inductors  
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Soft-Start  
Internally Compensated  
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Low Shutdown Current: <2μA  
Output Adjustable Down to 1.25V  
Low Profile (1mm) SOT-23 (ThinSOT™) and  
(2mm × 3mm × 0.75mm) 6-Pin DFN Packages  
Cycle-by-cycle current limit provides protection against  
shorted outputs, and soft-start eliminates input current  
surge during start up. The low current (<2μA) shutdown  
providesoutputdisconnect,enablingeasypowermanage-  
ment in battery-powered systems.  
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APPLICATIONS  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
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Automotive Battery Regulation  
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Industrial Control Supplies  
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Wall Transformer Regulation  
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Distributed Supply Regulation  
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Battery-Powered Equipment  
TYPICAL APPLICATION  
Efficiency  
95  
V
= 12V  
3.3V Step-Down Converter  
IN  
90  
85  
80  
75  
70  
65  
1N4148  
V
= 5V  
OUT  
V
IN  
V
BOOST  
LT1933  
IN  
4.5V TO 36V  
0.1μF  
22μH  
V
= 3.3V  
OUT  
V
OUT  
OFF ON  
SHDN  
SW  
FB  
3.3V/500mA  
GND  
MBRM140  
16.5k  
2.2μF  
22μF  
10k  
1933 TA01a  
100  
200  
LOAD CURRENT (mA)  
500  
600  
0
300  
400  
1933 TA01b  
1933fe  
1

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