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LT1940_15

更新时间： 2024-12-02 01:16:03
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 286K
描述
Dual Monolithic 1.4A, 1.1MHz Step-Down Switching Regulator

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LT1940_15 数据手册

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LT1940/LT1940L  
Dual Monolithic 1.4A,  
1.1MHz Step-Down  
Switching Regulator  
U
FEATURES  
DESCRIPTIO  
The LT®1940 is a dual current mode PWM step-down  
DC/DCconverterwithinternal2Apowerswitches.Bothcon-  
verters are synchronized to a single 1.1MHz oscillator and  
runwithoppositephases,reducinginputripplecurrent.The  
output voltages are set with external resistor dividers, and  
each regulator has independent shutdown and soft-start  
circuits. Each regulator generates a power-good signal  
when its output is in regulation, easing power supply se-  
quencingandinterfacingwithmicrocontrollersandDSPs.  
■
Wide Input Voltage Range  
LT1940: 3.6V to 25V  
LT1940L: 3.6V to 7V  
■
Two 1.4A Output Switching Regulators with  
Internal Power Switches  
■
Constant 1.1MHz Switching Frequency  
■
Anti-Phase Switching Reduces Ripple  
■
Independent Shutdown/Soft-Start Pins  
■
Independent Power Good Indicators Ease  
Supply Sequencing  
The LT1940’s 1.1MHz switching frequency allows the use  
of tiny inductors and capacitors, resulting in a very small  
dual1.4Aoutputsolution.Constantfrequencyandceramic  
capacitors combine to produce low, predictable output  
ripplevoltage. Withitswideinputrangeof3.6Vto25V, the  
LT1940 regulates a wide variety of power sources, from  
4-cellbatteriesand5Vlogicrailstounregulatedwalltrans-  
formers,leadacidbatteriesanddistributed-powersupplies.  
The LT1940L is intended to operate from regulated 5V  
supplies. A current mode PWM architecture provides fast  
transientresponsewithsimplecompensationcomponents  
andcycle-by-cyclecurrentlimiting.Frequencyfoldbackand  
thermal shutdown provide additional protection.  
■
Uses Small Inductors and Ceramic Capacitors  
■
Small 16-Lead Thermally Enhanced  
TSSOP Surface Mount Package  
U
APPLICATIO S  
■
Disk Drives  
■
DSP Power Supplies  
■
Wall Transformer Regulation  
Distributed Power Regulation  
DSL Modems  
Cable Modems  
■
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
IN  
7V TO 25V  
4.7µF  
V
CMDSH-3  
CMDSH-3  
IN  
Efficiency vs Load Current  
OUT2  
5V  
BOOST1 BOOST2  
LT1940  
100  
1.4A  
V
IN  
= 12V  
0.1µF  
0.1µF  
3.3µH  
4.7µH  
OUT1  
3.3V  
1.4A  
90  
80  
70  
60  
SW1  
SW2  
V
= 5V  
OUT  
UPS140  
16.5k  
UPS140  
30.1k  
FB1  
FB2  
V
= 3.3V  
OUT  
V
C1  
V
C2  
10µF  
15k  
15k  
10.0k  
RUN/SS1  
RUN/SS2  
PG1  
PG2  
10.0k  
100k  
330pF  
1nF  
10µF  
330pF  
GND  
0
0.5  
1.0  
1.5  
LOAD CURRENT (A)  
POWER  
GOOD  
1940 F01b  
1940 F01  
Figure 1. 3.3V and 5V Dual Output Step-Down Converter with Output Sequencing (LT1940)  
1940fa  
1
1234567...20

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