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LT1941EFE

更新时间： 2024-10-03 04:19:35
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 329K
描述
Triple Monolithic Switching Regulator

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LT1941EFE 数据手册

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LT1941  
Triple Monolithic  
Switching Regulator  
U
FEATURES  
DESCRIPTIO  
■
Wide Input Range: 3.5V to 25V  
Three Switching Regulators with Internal Power  
The LT®1941 is a triple current mode DC/DC converter  
with internal power switches. Two of the regulators are  
step-down converters with 3A and 2A power switches.  
The third regulator can be configured as a boost, inverter  
or SEPIC converter and has a 1.5A power switch. All three  
converters are synchronized to a 1.1MHz oscillator. The  
two step-down converters run with opposite phases,  
reducing input ripple current. The output voltages are set  
with external resistor dividers and each regulator has  
independent shutdown and soft-start circuits. Each regu-  
lator generates a power good signal when its output is in  
regulation, easing power supply sequencing and interfac-  
ing with microcontrollers and DSPs.  
■
Switches: 3A Step-Down, 2A Step-Down,  
1.5A Inverting/Boost  
■
Antiphase Switching Reduces Ripple  
■
Independent Shutdown/Soft-Start Pins  
■
Independent Power Good Indicators Ease Supply  
Sequencing  
■
Input Voltage Power Good Indicators Monitor Input  
Supply  
■
Uses Small Inductors and Ceramic Capacitors  
■
Constant 1.1MHz Switching Frequency  
■
Thermally Enhanced 28-Lead TSSOP Package  
The high switching frequency offers several advantages  
by permitting the use of small inductors and ceramic  
capacitors. Small inductors and capacitors lead to a very  
small triple output solution. The constant switching fre-  
quency, combined with low impedance ceramic capaci-  
tors, result in low, predictable output ripple. With its wide  
input voltage range of 3.5V to 25V, the LT1941 regulates  
a broad array of power sources from 4-cell batteries and  
5V logic rails to unregulated wall transformers, lead acid  
batteries and distributed-power supplies.  
U
APPLICATIO S  
■
Cable Modems  
DSL Modems  
■
■
Distributed Power Regulation  
Wall Transformer Regulation  
■
■
Disk Drives  
DSP Power  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
OUT1  
V
OUT2  
V
IN  
4.7V TO 14V  
130k 100k  
100k  
100k  
100k  
PGOOD1  
5GOOD PGOOD2  
12GOOD PGOOD3  
BOOST1 BOOST2  
LT1941  
PGOOD1  
Start-Up Waveforms  
with Sequencing  
5GOOD  
PGOOD2  
12GOOD  
PGOOD3  
RUN/SS  
0.22µF  
0.22µF  
10.7k  
3µH  
33µF  
22µH  
3.3µH  
V
OUT1  
1.8V  
2V/DIV  
SW1  
SW2  
V
3.3V  
1.4A  
13.7k  
OUT2  
2.4A  
V
OUT1  
FB1  
FB2  
2V/DIV  
3300pF  
1000pF  
1.5nF  
V
C1  
V
C2  
V
OUT2  
22µF  
5V/DIV  
10k 2.49k  
22nF  
7.32k 3.3k  
1.5nF  
RUNSS1 RUNSS2  
V
OUT3  
10V/DIV  
SW3  
NFB  
BIAS1  
BIAS2  
1µF  
22µH  
10µF  
I
VIN(AVE)  
1A/DIV  
V
*
OUT3  
–12V  
V
C3  
13.7k  
133k  
PGOOD2  
5V/DIV  
350mA  
FB3  
RUNSS3  
1.5k  
1941 F01b  
GND  
1.5nF  
10µF  
1941 F01  
*240mA AT V = 5V, 550mA AT V = 12V  
IN IN  
Figure 1. Triple Output Power Supply: 3.3V, 1.8V, –12V  
1941f  
1
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