LTC3632 datasheet(6/22 Pages) LINER

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LTC3632

3632fb

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 (50mA). Short this

pin to ground for the minimum peak current (10mA). 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 5.5μA 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 LTC3632, reducing quiescent

current to approximately 3μA.

VFB (Pin 6): Output Voltage Feedback. Connect to an

external resistive divider 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.

Soft-Start Waveforms

TYPICAL PERFORMANCE CHARACTERISTICS

Load Step Transient Response

Short-Circuit Response

OUTPUT

VOLTAGE

1V/DIV

5ms/DIV

CSS = 0.047μF

3632 G19

OUTPUT

VOLTAGE

100mV/DIV

LOAD

CURRENT

20mA/DIV

1ms/DIV

VIN = 10V

VOUT = 5V

3632 G20

OUTPUT

VOLTAGE

2V/DIV

INDUCTOR

CURRENT

20mA/DIV

200μs/DIV

VIN = 10V

VOUT = 5V

3632 G21

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