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LT1941 Datasheet

  • LT1941

  • Triple Monolithic Switching Regulator

  • 24頁

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LT1941
Triple Monolithic
Switching Regulator
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Wide Input Range: 3.5V to 25V
Three Switching Regulators with Internal Power
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 LT
廬
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.
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.
APPLICATIO S
s
s
s
s
s
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.
TYPICAL APPLICATIO
V
IN
4.7V TO 14V
130k
100k
V
OUT1
100k
PGOOD1
V
OUT2
100k
100k
PGOOD1
PGOOD2
PGOOD3
0.22碌F
3.3碌H
V
OUT2
3.3V
1.4A
22碌F
5GOOD
12GOOD
3碌H
13.7k
3300pF
33碌F
7.32k
3.3k
1.5nF
0.22碌F
5GOOD
BOOST1
PGOOD2
BOOST2
SW2
FB2
V
C2
1000pF
10k
2.49k
1.5nF
12GOOD PGOOD3
LT1941
SW1
FB1
V
C1
V
OUT1
1.8V
2.4A
10.7k
RUNSS1 RUNSS2
SW3
BIAS1
BIAS2
V
C3
FB3
RUNSS3
GND
NFB
22碌H
V
OUT3
*
鈥?2V
350mA
10碌F
1碌F
22碌H
133k
13.7k
22nF
10碌F
*240mA AT V
IN
= 5V, 550mA AT V
IN
= 12V
1.5nF
1.5k
1941 F01
Figure 1. Triple Output Power Supply: 3.3V, 1.8V, 鈥?2V
1941f
U
Start-Up Waveforms
with Sequencing
RUN/SS
2V/DIV
V
OUT1
2V/DIV
V
OUT2
5V/DIV
V
OUT3
10V/DIV
I
VIN(AVE)
1A/DIV
PGOOD2
5V/DIV
1941 F01b
U
U
1

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