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| 型号： | LT3971IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 21/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 10DFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
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LT3971/LT3971-3.3/LT3971-5
APPLICATIONS INFORMATION
Table 5: Effects of Pin Shorts
PINS
V IN -EN
SS-RT
RT-PG
PG-SYNC
EFFECT
No effect. In most applications, EN is tied to V IN . If EN is driven with a logic signal, a series resistor is recommended to protect the circuit
generating the logic signal from the full V IN voltage.
V OUT may fall below regulation voltage. The switching frequency will be increased and the current limit will be reduced.
No effect if PG is floated.
V OUT will fall below regulation if PG is connected to the output with a resistor pull-up as long as the resister divider formed by the PG pin
pull-up and the R T resistor prevents the RT pin absolute maximum from being violated. (see discussion in Fault Tolerance section)
In both cases, the switching frequency will be significantly increased if the output goes below regulation, which may cause the LT3975 to
go into pulse-skipping mode if the minimum on-time is violated.
No effect if PG is floated.
No effect if PG is connected to the output with a resistor pull-up as long as there is a resistor to GND on the SYNC pin or the SYNC pin is
tied to GND. This is to ensure that the resistor divider formed by the PG pin pull-up and the SYNC pin resistor to GND prevents the SYNC
pin absolute maximum from being violated. (see discussion in Fault Tolerance section)
SYNC-GND No effect. If the SYNC pin is driven with a clock, a series resistor is recommended to prevent the clock source from getting shorted out.
Table 6: Effects of Floating Pins
PIN
SS
BD
BOOST
SW
V IN
EN
RT
PG
SYNC
FB
GND
EFFECT
No effect; soft-start feature will not function.
V OUT may fall below regulation voltage. With the BD pin disconnected, the boost capacitor cannot be charged and thus the power switch
cannot fully saturate, which increases power dissipation.
V OUT may fall below regulation voltage. With the BOOST pin disconnected, the boost capacitor cannot be charged and thus the power switch
cannot fully saturate, which increases power dissipation.
V OUT will fall below regulation voltage.
V OUT will fall below regulation voltage.
V OUT may fall below regulation voltage. Part may work normally or be shutdown depending on how the application circuit couples to the
floating EN pin.
V OUT may fall below regulation voltage.
No effect.
No effect. The LT3971 may be in Burst Mode operation or pulse-skipping mode depending on how the application circuit couples to the
floating SYNC pin.
No effect; there are two FB pins.
No effect; there are two GND connections. If exposed pad is floated, thermal performance will be degraded.
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.
3971fd
21
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| 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 |
| LT3971IMSE16#TRPBF | 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:- 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 |
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