LTC3414MPFE datasheet(5/16 Pages) LINER

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LTC3414

3414fb

PGND (Pins 1, 10, 11, 20): Power Ground. Connect this

pin closely to the (–) terminal of CIN and COUT.

RT (Pin 2): Oscillator Resistor Input. Connecting a resistor

to ground from this pin sets the switching frequency.

SYNC/MODE (Pin 3): Mode Select and External Clock

Synchronization Input. To select Forced Continuous, tie to

SVIN. Connecting this pin to a voltage between 0V and 1V

selects Burst Mode operation with the burst clamp set to

the pin voltage.

RUN/SS (Pin 4): Run Control and Soft-Start Input. Forcing

this pin below 0.5V shuts down the LTC3414. In shutdown

all functions are disabled. Less than 1

μA of supply current

is consumed. A capacitor to ground from this pin sets the

ramp time to full output current.

SGND (Pin 5):Signal Ground. All small signal components

and compensation components should connect to this

ground, which in turn connects to PGND at one point.

NC (Pin 6): Open. No internal connection.

PVIN (Pins 7, 14): Power Input Supply. Decouple this pin

to PGND with a capacitor.

SW (Pins 8, 9, 12, 13): Switch Node Connection to

Inductor. This pin connects to the drains of the internal

main and synchronous power MOSFET switches.

NC (Pin 15): Open. No internal connection.

SVIN (Pin 16): Signal Input Supply. Decouple this pin to

SGND with a capacitor.

PGOOD (Pin 17): Power Good Output. Open drain logic

output that is pulled to ground when the output voltage is

not within

±7.5% of regulation point.

ITH (Pin 18): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is from 0.2V to

1.4V with 0.4V corresponding to the zero-sense voltage

(zero current).

VFB (Pin 19): Feedback Pin. Receives the feedback voltage

from a resistive divider connected across the output.

Exposed Pad (Pin 21): Should be connected to SGND and

soldered to the PCB.

PI FU CTIO S

Start-Up Transient

TYPICAL PERFOR A CE CHARACTERISTICS

3414 G19

VIN = 3.3V, VOUT = 2.5V

LOAD = 4A

OUTPUT

VOLTAGE

INDUCTOR

CURRENT

2A/DIV

VRUN

1ms/DIV

Load Step Transient Burst Mode

Operation

3414 G18

VIN = 3.3V, VOUT = 2.5V

LOAD STEP = 250mA TO 4A

OUTPUT

VOLTAGE

100mV/DIV

INDUCTOR

CURRENT

2A/DIV

μs/DIV

LTC3414MPFE Datasheet(PDF) 5 Page - Linear Technology

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