参数资料
型号: LTC3631IDD-5#PBF
厂商: Linear Technology
文件页数: 6/22页
文件大小: 0K
描述: IC REG BUCK SYNC 5V 0.1A 8DFN
标准包装: 121
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: 4.5 V ~ 45 V
PWM 型: Burst Mode?
电流 - 输出: 100mA
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
包装: 管件
供应商设备封装: 8-DFN-EP(3x3)
LTC3631
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT
VOLTAGE
1V/DIV
Soft-Start Waveform
OUTPUT
VOLTAGE
50mV/DIV
LOAD
CURRENT
50mA/DIV
Load Step Transient Response
OUTPUT
VOLTAGE
2V/DIV
INDUCTOR
CURRENT
100mA/DIV
Short-Circuit Response
C SS = 0.047μF
5ms/DIV
3631 G19
V IN = 24V
V OUT = 5V
1ms/DIV
3631 G20
V IN = 10V
V OUT = 5V
200μs/DIV
3631 G21
PIN FUNCTIONS
SW (Pin 1): Switch Node Connection to Inductor. This
pin connects to the drains of the internal power MOSFET
switches.
V IN (Pin 2): Main Supply Pin. A ceramic bypass capacitor
should be tied between this pin and GND (Pin 8).
I SET (Pin 3): Peak Current Set Input. A resistor from this
pin to ground sets the peak current trip threshold. Leave
floating for the maximum peak current (225mA). Short
this pin to ground for the minimum peak current (50mA).
A 1μA current is sourced out of this pin.
SS (Pin 4) : Soft-Start Control Input. A capacitor to ground
at this pin sets the ramp time to full current output dur-
ing start-up. A 5μA current is sourced out of this pin. If
left floating, the ramp time defaults to an internal 0.75ms
soft-start.
V OUT /V FB (Pin 6): Output Voltage Feedback. For the fixed
output versions, connect this pin to the output supply. For
the adjustable version, an external resistive divider should
be used to divide the output voltage down for comparison
to the 0.8V reference.
HYST (Pin 7): Run Hysteresis Open-Drain Logic Output.
This pin is pulled to ground when RUN (Pin 5) is below
1.2V. This pin can be used to adjust the RUN pin hysteresis.
See Applications Information.
GND (Pin 8, Exposed Pad Pin 9): Ground. The exposed
pad must be soldered to the printed circuit board ground
plane for optimal electrical and thermal performance.
RUN (Pin 5): Run Control Input. A voltage on this pin
above 1.2V enables normal operation. Forcing this pin
below 0.7V shuts down the LTC3631, reducing quiescent
current to approximately 3μA.
3631fe
6
For more information www.linear.com/LTC3631
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