- 您现在的位置：买卖IC网 > PDF目录1823 > LT1940EFE#TRPBF (Linear Technology)IC REG BUCK ADJ 1.4A DL 16TSSOP PDF资料下载
参数资料
| 型号： | LT1940EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.4A DL 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1.25 V ~ 22 V |
| 输入电压： | 3.6 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 1.4A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LT1940/LT1940L
Dual Monolithic 1.4A,
1.1MHz Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
s
s
s
s
s
s
s
s
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
Uses Small Inductors and Ceramic Capacitors
Small 16-Lead Thermally Enhanced
TSSOP Surface Mount Package
The LT ? 1940 is a dual current mode PWM step-down
DC/DC converter with internal 2A power switches. Both con-
verters are synchronized to a single 1.1MHz oscillator and
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 regulator generates a power-good signal
when its output is in regulation, easing power supply se-
quencing and interfacing with microcontrollers and DSPs.
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 ceramic
capacitors combine to produce low, predictable output
APPLICATIO S
ripple voltage. With its wide input range of 3.6V to 25V, the
LT1940 regulates a wide variety of power sources, from
s
s
s
s
s
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.
4-cell batteries and 5V logic rails to unregulated wall trans-
formers, lead acid batteries and distributed-power supplies.
The LT1940L is intended to operate from regulated 5V
supplies. A current mode PWM architecture provides fast
transient response with simple compensation components
and cycle-by-cycle current limiting. Frequency foldback and
thermal shutdown provide additional protection.
TYPICAL APPLICATIO
V IN
7V TO 25V
4.7 μ F
CMDSH-3
V IN
CMDSH-3
OUT2
Efficiency vs Load Current
BOOST1
BOOST2
5V
1.4A
100
V IN = 12V
OUT1
3.3 μ H
0.1 μ F
LT1940
0.1 μ F
4.7 μ H
3.3V
1.4A
UPS140
SW1
SW2
UPS140
90
V OUT = 5V
16.5k
FB1
FB2
30.1k
80
V OUT = 3.3V
V C1
V C2
10.0k
15k
RUN/SS1
PG1
15k
10.0k
10 μ F
70
10 μ F
330pF
1nF
RUN/SS2
GND
PG2
330pF
100k
60
0
0.5 1.0
1.5
LOAD CURRENT (A)
1940 F01
POWER
GOOD
1940 F01b
Figure 1. 3.3V and 5V Dual Output Step-Down Converter with Output Sequencing (LT1940)
1940fa
1
相关PDF资料 |
PDF描述 |
|---|---|
| LT1941EFE#TRPBF | IC REG MULTI CONFIG TRPL 28TSSOP |
| LT1942EUF#TRPBF | IC REG SW QUAD TFT LCD 24-QFN |
| LT1943EFE#TRPBF | IC REG SW QUAD TFT LCD 28-TSSOP |
| LT1944-1EMS#TR | IC REG BST ADJ 0.1A/175MA 10MSOP |
| LT1945IMS#TRPBF | IC REG MULTI CONFIG ADJ 10MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1940LEFE | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1940LEFE#PBF | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT1940LEFE#TR | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1940LEFE#TRPBF | 功能描述:IC REG BUCK ADJ 1.4A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1940LEFEPBF | 制造商:Linear Technology 功能描述:Sw. Regulator Dual 1.4A 1.1MHz 7V TSSOP |
发布紧急采购，3分钟左右您将得到回复。