收藏本站
LTM8032
APPLICATIONS INFORMATION
V RUN/SS
GND
Soft-Start
The RUN/SS pin can be used to soft-start the LTM8032,
reducing the maximum input current during start-up. The
RUN/SS pin is driven through an external RC network to
create a voltage ramp at this pin. Figure 2 shows the start-
up and shutdown waveforms with the soft-start circuit. By
choosing an appropriate RC time constant, the peak start-up
current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply at least 20μA when
the RUN/SS pin reaches 2.5V.
I L
RUN 1A/DIV
15k
RUN/SS
2V/DIV
0.22μF
V OUT
2V/DIV
Shorted Input Protection
Care needs to be taken in systems where the output will
be held high when the input to the LTM8032 is absent.
This may occur in battery charging applications or in
battery back-up systems where a battery or some other
supply is diode ORed with the LTM8032’s output. If the
V IN pin is allowed to float and the RUN/SS pin is held high
(either by a logic signal or because it is tied to V IN ), then
the LTM8032’s internal circuitry will pull its quiescent
current through its internal power switch. This is fine if
your system can tolerate a few milliamps in this state. If
you ground the RUN/SS pin, the internal switch current
will drop to essentially zero. However, if the V IN pin is
grounded while the output is held high, then parasitic
diodes inside the LTM8032 can pull large currents from
the output through the V IN pin, potentially damaging the
device. Figure 3 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
2ms/DIV 8023 F02
Figure 2. To Soft-Start the LTM8032, Add a Resistor
and Capacitor to the RUN/SS Pin
V IN
V IN
RUN/SS
LTM8032
V OUT
AUX
BIAS
ADJ
V OUT
R T SYNC GND
Synchronization
The internal oscillator of the LTM8032 can be synchro-
nized by applying an external 250kHz to 2MHz clock to
the SYNC pin. Do not leave this pin floating. The resistor
tied from the RT pin to ground should be chosen such
that the LTM8032 oscillates 20% lower than the intended
synchronization frequency (see the Frequency Selection
section). The LTM8032 will not enter Burst Mode operation
while synchronized to an external clock, but will instead
skip pulses to maintain regulation.
8032 F03
Figure 3. The Input Diode Prevents a Shorted Input from
Discharging a Back-Up Battery Tied to the Output. It Also
Protects the Circuit from a Reversed Input. The LTM8032
Runs Only When the Input is Present
8032fg
For more information www.linear.com/LTM8032
13
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LTM8033MPV#PBF IC DC-DC UMODULE BUCK 3A 76-LGA
LTM8040IV#PBF IC LED DRVR HP CONST CURR 66-LGA
LTM8042IV#PBF IC UMODULE LED DRIVER 56LGA
LTM8048MPY#PBF IC DC/DC UMODULE LDO BGA
LTM8052AEV#PBF IC UMODULE 36VIN 5A CVCC 81LGA
M30R224K5 CAP CER 0.22UF 50V 10% RADIAL
M39014/22-0709 CAP CER 1000PF 100V 1% RADIAL
M41L0Q1U JOYSTICK MINI 3AXIS W/BUTTON
相关代理商/技术参数
LTM8033 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultralow EMI 28VIN, 6A DC/DC μModule Regulator
LTM8033EV#PBF 功能描述:IC DC-DC UMODULE BUCK 3A 76-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:55V 电压 - 输入（最大）:100V Voltage - Output 1:5.8V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:100W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9 针半砖 BusMod 尺寸/尺寸:2.36" L x 2.28" W x 1.08" H（59.9mm x 57.9mm x 27.4mm） 包装:散装 工作温度:-25°C ~ 100°C 效率:* 电源（瓦特）- 最大:*
LTM8033EVPBF 制造商:Linear Technology 功能描述:Low Noise EMC 36V 3A DC/DC uModule LGA76
LTM8033EV-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultralow Noise EMC 36VIN, 3A DC/DC μModule Regulator
LTM8033IV#PBF 功能描述:IC DC-DC UMODULE BUCK 3A 76-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:*
LTM8033IV-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultralow Noise EMC 36VIN, 3A DC/DC μModule Regulator
LTM8033MPV#PBF 功能描述:IC DC-DC UMODULE BUCK 3A 76-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:*
LTM8033MPV-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultralow Noise EMC 36VIN, 3A DC/DC ??Module Regulator