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参数资料
| 型号： | LT3991IMSE-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.2A 10-MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.3 V ~ 55 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 200kHz ~ 2MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 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： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LT3991/LT3991-3.3/LT3991-5
APPLICATIONS INFORMATION
loss. The die temperature is calculated by multiplying the
LT3991 power dissipation by the thermal resistance from
junction to ambient.
Also keep in mind that the leakage current of the power
Schottky diode goes up exponentially with junction tem-
perature. When the power switch is closed, the power
Schottky diode is in parallel with the power converter’s
output filter stage. As a result, an increase in a diode’s
leakage current results in an effective increase in the load,
and a corresponding increase in input power. Therefore,
the catch Schottky diode must be selected with care to
TYPICAL APPLICATIONS
5V Step-Down Converter
V IN
6.6V TO 55V
V IN
avoid excessive increase in light load supply current at
high temperatures.
Other Linear Technology Publications
Application Notes 19, 35 and 44 contain more detailed
descriptions and design information for buck regulators
and other switching regulators. The LT1376 data sheet
has a more extensive discussion of output ripple, loop
compensation and stability testing. Design Note 318
shows how to generate a bipolar output supply using a
buck regulator.
2.5V Step-Down Converter
V IN
4.3V TO 55V
V IN
OFF ON
EN
BOOST
OFF ON
EN
BOOST
4.7μF
PG
SS
LT3991
SW
0.47μF
10μH
4.7μF
PG
SS
LT3991
SW
1μF
10μH
RT
RT
BD
10pF
BD
10pF
118k
f = 400kHz
SYNC
GND
FB
309k
1M
47μF
V OUT
5V
1.2A
162k
f = 300kHz
SYNC
GND
FB
909k
1M
47μF
V OUT
2.5V
1.2A
V IN
4.3V TO 55V
3.3V Step-Down Converter
3991 TA02
V IN
6.6V TO 55V
5V Step-Down Converter
3991 TA03
OFF ON
EN
V IN
BOOST
OFF ON
EN./UVLO
V IN
BOOST
4.7μF
PG
SS
LT3991
SW
0.47μF
10μH
V OUT
3.3V
1.2A
4.7μF
PG
SS
LT3991-5
SW
0.47μF 15μH
RT
RT
118k
SYNC
GND
BD
FB
1M
1.78M
10pF
47μF
118k
f = 400kHz
SYNC
GND
BD
V OUT
47μF
3991 TA10
V OUT
5V
1.2A
19
f = 400kHz
3991 TA09
3991fa
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3991IMSEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current |
| LT3991IMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:55V, 1.2A Step-Down Regulator with 2.8 Quiescent Current |
| LT3992 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic Dual Tracking |
| LT3992EFE#PBF | 功能描述:IC REG BUCK ADJ 3A DL 38-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3992EFE#TRPBF | 功能描述:IC REG BUCK ADJ 3A DL 38-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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