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LTC3631 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3631
Description  High Effi ciency, High Voltage 100mA Synchronous Step-Down Converter
PDF  22 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3631 Datasheet(HTML) 6 Page - Linear Technology

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LTC3631
6
3631fb
PIN FUNCTIONS
SW (Pin 1): Switch Node Connection to Inductor. This
pin connects to the drains of the internal power MOSFET
switches.
VIN (Pin 2): Main Supply Pin. A ceramic bypass capacitor
should be tied between this pin and GND (Pin 8).
ISET (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.
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.
VOUT/VFB (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.
TYPICAL PERFORMANCE CHARACTERISTICS
Soft-Start Waveform
Load Step Transient Response
Short-Circuit Response
OUTPUT
VOLTAGE
1V/DIV
5ms/DIV
CSS = 0.047μF
3631 G19
OUTPUT
VOLTAGE
50mV/DIV
LOAD
CURRENT
50mA/DIV
1ms/DIV
3631 G20
VIN = 24V
VOUT = 5V
OUTPUT
VOLTAGE
2V/DIV
INDUCTOR
CURRENT
100mA/DIV
200μs/DIV
3631 G21
VIN = 10V
VOUT = 5V



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