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| 型号： | LT1941EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG TRPL 28TSSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 1.25 V ~ 40 V |
| 输入电压： | 3.5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
LT1941
Triple Monolithic
Switching Regulator
FEATURES
DESCRIPTION
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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 ? 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 con?gured 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 phase,
reducing input ripple current. 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.
Cable Modems
DSL Modems
Distributed Power Regulation
Wall Transformer Regulation
Disk Drives
DSP Power
APPLICATIONS
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L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
The high switching frequency offers several advantages
by permitting the use of small inductors and ceramic
capacitors, leading to a very small triple output solution.
The constant switching frequency, combined with low
impedance ceramic capacitors, 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.
V IN
4.7V TO 14V
V OUT1
V OUT2
5GOOD
12GOOD
130k
100k
V IN
PGOOD1
5GOOD PGOOD2
12GOOD PGOOD3
100k
100k
100k
PGOOD1
PGOOD2
PGOOD3
Start-Up Waveforms
with Sequencing
BOOST1
BOOST2
V OUT1
1.8V
2.4A
3μH
33μF
13.7k
7.32k
0.22μF
3300pF
3.3k
1.5nF
LT1941
SW1 SW2
FB1 FB2
V C1 V C2
RUNSS1 RUNSS2
1000pF
1.5nF
10k
0.22μF
10.7k
2.49k
3.3μH
22μF
V OUT2
3.3V
1.4A
RUN/SS
2V/DIV
V OUT1
2V/DIV
V OUT2
5V/DIV
1μF
V OUT3
–12V
350mA*
10μF
22μH
22μH
10μF
133k
13.7k
SW3
NFB
FB3
BIAS1
BIAS2
V C3
RUNSS3
GND
1.5nF
22nF
1.5k
V OUT3
10V/DIV
I VIN(AVE)
1A/DIV
PGOOD2
5V/DIV
2ms/DIV
1941 F01b
1941 F01
*240mA AT V IN = 5V, 550mA AT V IN = 12V
Figure 1. Triple Output Power Supply: 3.3V, 1.8V, –12V
1941fb
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