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| 型号： | LT1940EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20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
TYPICAL PERFOR A CE CHARACTERISTICS
RUN/SS Thresholds vs
Temperature
Minimum Input Voltage,
V OUT = 3.3V
Minimum Input Voltage,
V OUT = 5V
1.4
1.2
6.0
5.5
V IN TO START
T A = 25 ° C
D BOOST = BAT54
7.5
7.0 V IN TO START
T A = 25 ° C
D BOOST = BAT54
1.0
0.8
0.6
0.4
0.2
TO RUN
TO SWITCH
5.0
4.5
4.0
3.5
V IN TO RUN
BOOST DIODE
TIED TO OUTPUT
BOOST DIODE
TIED TO INPUT
6.5
6.0
5.5
5.0
V IN TO RUN
BOOST DIODE
TIED TO OUTPUT
BOOST DIODE
TIED TO INPUT
0
–50 –25
0
25
50
75
100
125
3.0
1
10 100
1000
4.5
1
10 100
1000
TEMPERATURE ( ° C)
PI FU CTIO S
1940 G13
LOAD CURRENT (mA)
1940 G14
LOAD CURRENT (mA)
1940 G14
BOOST1, BOOST2 (Pins 1, 8): The BOOST pins are used
to provide drive voltages, higher than the input voltage, to
the internal bipolar NPN power switches.Tie through a
diode from V OUT or from V IN .
SW1, SW2 (Pins 2, 7): The SW pins are the outputs of the
internal power switches. Connect these pins to the induc-
tors, catch diodes and boost capacitors.
V IN (Pins 3, 4, 5, 6): The V IN pins supply current to the
LT1940’s internal regulator and to the internal power
switches. These pins must be tied to the same source, and
must be locally bypassed.
FB1, FB2 (Pins 9, 16): The LT1940 regulates each feed-
back pin to 1.25V. Connect the feedback resistor divider
taps to these pins.
V C1 , V C2 (Pins 10, 15): The V C pins are the outputs of the
internal error amps. The voltages on these pins control the
peak switch currents. These pins are normally used to
compensate the control loops, but can also be used to
override the loops. Pull these pins to ground with an open
drain to shut down each switching regulator.
PG1, PG2 (Pins 11, 14): The Power Good pins are the
open collector outputs of an internal comparator. PG
remains low until the FB pin is within 10% of the final
regulation voltage. As well as indicating output regulation,
the PG pins can be used to sequence the two switching
regulators. These pins can be left unconnected. The PG
outputs are valid when V IN is greater than 2.4V and either
of the RUN/SS pins is high. The PG comparators are
disabled in shutdown.
RUN/SS1, RUN/SS2 (Pins 12, 13): The RUN/SS pins are
use to shut down the individual switching regulators and
the internal bias circuits. They also provide a soft-start
function. To shut down either regulator, pull the RUN/SS
pin to ground with an open drain or collector. Tie a
capacitor from these pins to ground to limit switch current
during start-up. If neither feature is used, leave these pins
unconnected.
GND (Pin 17): The Exposed Pad of the package provides
both electrical contact to ground and good thermal con-
tact to the printed circuit board. The Exposed Pad must be
soldered to the circuit board for proper operation.
1940fa
5
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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 |
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