5

LTC3406

LTC3406-1.5/LTC3406-1.8

3406fa

TYPICAL PERFOR A CE CHARACTERISTICS

(From Figure 1a Except for the Resistive Divider Resistor Values)

Start-Up from Shutdown

Load Step

Load Step

RUN

2V/DIV

500mA/DIV

2V/DIV

40µs/DIV

3406 G16

500mA/DIV

500mA/DIV

100mV/DIV

AC COUPLED

20µs/DIV

3406 G17

500mA/DIV

500mA/DIV

100mV/DIV

AC COUPLED

20µs/DIV

3406 G18

Load Step

Load Step

500mA/DIV

500mA/DIV

100mV/DIV

AC COUPLED

20µs/DIV

3406 G19

500mA/DIV

500mA/DIV

100mV/DIV

AC COUPLED

20µs/DIV

3406 G20

PI FU CTIO S

RUN (Pin 1): Run Control Input. Forcing this pin above

1.5V enables the part. Forcing this pin below 0.3V shuts

down the device. In shutdown, all functions are disabled

drawing <1µA supply current. Do not leave RUN floating.

GND (Pin 2): Ground Pin.

SW (Pin 3): Switch Node Connection to Inductor. This pin

connects to the drains of the internal main and synchro-

nous power MOSFET switches.

to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.

back voltage from an external resistive divider across the

output.

age Feedback Pin. An internal resistive divider divides the

output voltage down for comparison to the internal refer-

ence voltage.