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| 型号： | LT3972EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 30 V |
| 输入电压： | 3.6 V ~ 33 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 230kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3972
APPLICATIONS INFORMATION
to ambient can be reduced to JA = 35°C/W or less. With
100 LFPM air?ow, this resistance can fall by another 25%.
Further increases in air?ow will lead to lower thermal re-
sistance. Because of the large output current capability of
the LT3972, it is possible to dissipate enough heat to raise
the junction temperature beyond the absolute maximum of
125°C. When operating at high ambient temperatures, the
maximum load current should be derated as the ambient
temperature approaches 125°C.
Power dissipation within the LT3972 can be estimated by
calculating the total power loss from an ef?ciency measure-
ment and subtracting the catch diode loss and inductor
CLOSING SWITCH
loss. The die temperature is calculated by multiplying the
LT3972 power dissipation by the thermal resistance from
junction to ambient.
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 100
shows how to generate a bipolar output supply using a
buck regulator.
DANGER
SIMULATES HOT PLUG
I IN
V IN
LT3972
V IN
20V/DIV
RINGING V IN MAY EXCEED
+
4.7μF
ABSOLUTE MAXIMUM RATING
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
+
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
0.7W
0.1μF
LT3972
4.7μF
LT3972
I IN
10A/DIV
(10a)
V IN
20V/DIV
I IN
10A/DIV
(10b)
V IN
20V/DIV
20μs/DIV
20μs/DIV
+
22μF
35V
+
4.7μF
AI.EI.
I IN
10A/DIV
(10c)
20μs/DIV
3972 F10
Figure 10. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation when the LT3972 is Connected to a Live Supply
3972fa
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3972EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
| LT3972EMSE#PBF | 功能描述:IC REG BUCK ADJ 3.5A 10MSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3972EMSE#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-10 制造商:Linear Technology 功能描述:IC, STEP-DOWN REGULATOR, MSOP-10 |
| LT3972EMSE#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A 10MSOP 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 |
| LT3972EMSEPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-33V MSOP10 |
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