LTC3413

5

3413fc

Start-Up

1ms/DIV

LOAD = 0.4Ω

OUTPUT

VOLTAGE

500mV/DIV

INDUCTOR

CURRENT

1A/DIV

3413 G13

Load Step Transient

20μs/DIV

LOAD STEP = 0A TO –3A

OUTPUT

VOLTAGE

100mV/DIV

INDUCTOR

CURRENT

1A/DIV

3413 G12

TYPICAL PERFORMANCE CHARACTERISTICS

be less than 0.5V.

PGOOD (Pin 2): Power Good Output. Open-drain logic

output that is pulled to ground when the output voltage

is not within ±10% of regulation point.

current comparator threshold increases with this control

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

to 1.4V with 0.6V corresponding to the zero-sense voltage

(zero current).

from the output.

to ground from this pin sets the switching frequency.

of the internal error amplifier senses one-half of the volt-

age at this pin through a resistor divider.

RUN/SS (Pin 7): Run Control and Soft-Start Input. Forcing

this pin below 0.5V shuts down the LTC3413. In shutdown

all functions are disabled drawing < 1μA of supply current.

A capacitor to ground from this pin sets the ramp time to

full output current.

SGND (Pin 8): Signal Ground. All small-signal components

and compensation components should connect to this

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

to PGND with a capacitor.

SW (Pins 10, 11, 14, 15): Switch Node Connection to

Inductor. This pin connects to the drains of the internal

main and synchronous power MOSFET switches.

PGND (Pins 12, 13): Power Ground. Connect this pin

Exposed Pad (Pin 17): Should be connected to PCB

ground.

PIN FUNCTIONS