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| 型号： | LT3971IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 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： | 1.19 V ~ 30 V |
| 输入电压： | 4.3 V ~ 38 V |
| PWM 型： | 电流模式，Burst Mode? |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
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LT3971/LT3971-3.3/LT3971-5
APPLICATIONS INFORMATION
loss. The die temperature is calculated by multiplying the
LT3971 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
avoid excessive increase in light load supply current at
high temperatures.
Fault Tolerance of MS16E Package
The MS16E package is designed to tolerate single fault
conditions. Shorting two adjacent pins together or leaving
one single pin floating does not raise the output voltage
or cause damage to the LT3971 regulator. However, the
application circuit must meet a few requirements discussed
in this section in order to achieve fault tolerance.
Tables 5 and 6 show the effects that result from shorting
adjacent pins or from a floating pin, respectively.
V IN
15V TO 38V
There are four items which require consideration in terms
of the application circuit to achieve fault tolerance: V IN -EN
pin short, SYNC-GND pin short, SYNC-PG pin short, and
PG-RT pin short. If the EN pin is driven with a logic input,
then a series resistor is needed to protect the circuit gen-
erating the logic input in the event of an EN-V IN pin short.
If the SYNC pin is driven with a clock, a series resistor is
needed so that the clock source, which may be going to
other devices, is not pulled down in the event of a SYNC-
GND pin short. If the PG pull-up resistor is connected to a
voltage source higher than 6V, then the PG resistor needs
to be large enough such that the resistor divider formed
by a PG-RT pin short does not violate the RT pin absolute
maximum. Likewise, a SYNC resistor to GND is needed so
that the resistor divider formed by a PG-SYNC pin short
does not violate the SYNC pin absolute maximum. This
means that typical applications where EN is tied to V IN ,
SYNC is grounded, and PG is floating or connected to a
pull-up resistor to an output less than 6V are already set
up for fault tolerance. Figure 10, shows how fault toler-
ance can be achieved when PG, EN, and SYNC features
are used in a high output voltage application.
OFF ON
10μF
100k
EN
V IN
BOOST
SW
0.47μF 10μH
LT3971
150k
SS
RT
PG
BD
PGOOD
1nF
49.9k
CLOCK IN
SYNC
GND
FB
110k
1M
10pF
10μF
V OUT
12V
1.2A
49.9k
f SW = 800kHz
3971 F10
Figure 10. Fault Tolerant Application with EN, SYNC and PG Functions in Use when Using the MS16E Package
3971fd
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3971IDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:38V, 1.2A, 2MHz Step-Down Regulator with 2.8 Quiescent Current |
| LT3971IMSE#PBF | 功能描述:IC REG BUCK ADJ 1.2A 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: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 |
| LT3971IMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2MHZ M 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2MHZ, MSOP-10 |
| LT3971IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 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: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 |
| LT3971IMSE16#PBF | 功能描述:IC REG BUCK ADJ 1.2A 16MSOP 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 |
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