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LTC3418

3418f

Load Regulation

Peak Inductor Current

vs Burst Clamp Voltage

VBCLAMP (V)

0.2

0.4

0.6

0.8

3418 G13

0.1

0.3

0.5

0.7

3.3V

LOAD CURRENT (A)

–0.30

–0.25

–0.20

–0.15

–0.10

3418 G14

–0.05

VIN = 3.3V

VOUT = 1.8V

f = 1MHz

Load Step Transient

OUTPUT

VOLTAGE

100mV/DIV

INDUCTOR

CURRENT

5A/DIV

20µs/DIV

VIN = 3.3V

VOUT = 2.5V

LOAD STEP: 800mA TO 8A

3418 G15

Load Step Transient

OUTPUT

VOLTAGE

100mV/DIV

INDUCTOR

CURRENT

5A/DIV

40µs/DIV

VIN = 3.3V

VOUT = 2.5V

LOAD STEP: 3A TO 8A

3418 G16

Burst Mode Operation

Start-Up Transient

OUTPUT

VOLTAGE

100mV/DIV

INDUCTOR

CURRENT

1A/DIV

20µs/DIV

VIN = 3.3V

VOUT = 2.5V

LOAD: 200mA

3418 G17

OUTPUT

VOLTAGE

500mV/DIV

INDUCTOR

CURRENT

2A/DIV

1ms/DIV

VIN = 3.3V

VOUT = 2.5V

LOAD: 8A

3418 G18

SW (Pins 1, 2, 11, 12, 20, 21, 30, 31): Switch Node

Connection to Inductor. This pin connects to the drains of

the internal main and synchronous power MOSFET

switches.

PVIN (Pins 3, 4, 9, 10, 22, 23, 28, 29): Power Input

Supply. Decouple this pin to PGND with a capacitor.

PGOOD (Pin 5): Power Good Output. Open-drain logic

output that is pulled to ground when the output voltage is

not within ±7.5% of regulation point.

RT (Pin 6): Oscillator Resistor Input. Connecting a resistor

to ground from this pin sets the switching frequency.

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

this pin below 0.5V shuts down the LTC3418. In shutdown

all functions are disabled drawing <1.5µA of supply cur-

rent. A capacitor to ground from this pin sets the ramp

time to full output current.

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

nents and compensation components should connect to

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

PGND (Pins 13, 14, 15, 17, 18, 19, 32, 33, 34, 36, 37,

38): Power Ground. Connect this pin closely to the (–)

terminal of CIN and COUT.

VREF (Pin 16): Reference Output. Decouple this pin with a

2.2µF capacitor.

SVIN (Pin 24): Signal Input Supply. Decouple this pin to

SGND with a capacitor.

PI FU CTIO S

TYPICAL PERFOR A CE CHARACTERISTICS T

A = 25°C unless otherwise noted.

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