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LT1940

更新时间： 2024-10-02 22:51:47
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 259K
描述
Dual Monolithic 1.4A, 1.1MHz Step-Down Switching Regulator

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中文翻译

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LT1940 数据手册

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Final Electrical Specifications  
LT1940  
Dual Monolithic 1.4A,  
1.1MHz Step-Down Switching Regulator  
U
August 2002  
DESCRIPTIO  
FEATURES  
The LT®1940 is a dual current mode PWM step-down  
DC/DC converter with internal 2A power switches. Both  
converters are synchronized to a single 1.1MHz oscillator  
and run with opposite phases, reducing input ripple cur-  
rent. 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 sequencing and interfacing with microcontrollers  
and DSPs.  
■
Wide Input Voltage Range: 3.6V to 25V  
Two 1.4A Output Switching Regulators with  
Internal Power Switches  
■
■
■
■
■
■
Small 16-Lead TSSOP Surface Mount Package  
Constant 1.1MHz Switching Frequency  
Anti-Phase Switching Reduces Ripple  
Independent Shutdown/Soft-Start Pins  
Independent Power Good Indicators Ease  
Supply Sequencing  
■
Uses Small Inductors and Ceramic Capacitors  
U
The LT1940’s 1.1MHz switching frequency allows the use  
of tiny inductors and capacitors, resulting in a very small  
dual 1.4A output solution. Constant frequency and ce-  
ramic capacitors combine to produce low, predictable  
output ripple voltage. With its wide input range of 3.6V to  
25V,theLT1940regulatesawidevarietyofpowersources,  
from 4-cell batteries and 5V logic rails to unregulated wall  
transformers, lead acid batteries and distributed-power  
supplies. A current mode PWM architecture provides fast  
transient response with simple compensation compo-  
nents and cycle-by-cycle current limiting. Frequency  
foldbackandthermalshutdownprovideadditionalprotec-  
tion.  
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  
Efficiency vs Load Current  
4.7µF  
CMDSH-3  
100  
V
IN  
CMDSH-3  
V
= 12V  
OUT2  
5V  
IN  
BOOST1 BOOST2  
LT1940  
1.4A  
0.1µF  
0.1µF  
90  
80  
70  
60  
3.3µH  
4.7µH  
OUT1  
3.3V  
1.4A  
V
= 5V  
OUT  
SW1  
SW2  
UPS140  
16.5k  
UPS140  
30.1k  
FB1  
FB2  
V
= 3.3V  
OUT  
V
C1  
V
C2  
10µF  
15k  
15k  
10.0k  
RUN/SS1  
PG1  
PG2  
10.0k  
100k  
330pF  
1nF  
RUN/SS2  
10µF  
330pF  
GND  
0
0.5  
1.0  
1.5  
POWER  
GOOD  
1940 F01  
LOAD CURRENT (A)  
1940 F01b  
Figure 1. 3.3V and 5V Dual Output Step-Down  
Converter with Output Sequencing  
1940i  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
1
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