LTC3405A-1.5 datasheet(5/16 Pages) LINER

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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

RUN

2V/DIV

ILOAD

500mA/DIV

VOUT

2V/DIV

40µs/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 600mA

3406 G16

500mA/DIV

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC COUPLED

20µs/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 0mA TO 600mA

3406 G17

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC COUPLED

20µs/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 50mA TO 600mA

3406 G18

Load Step

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC COUPLED

20µs/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 100mA TO 600mA

3406 G19

500mA/DIV

ILOAD

500mA/DIV

VOUT

100mV/DIV

AC COUPLED

20µs/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 200mA TO 600mA

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.

VIN (Pin 4): Main Supply Pin. Must be closely decoupled

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

VFB (Pin 5) (LTC3406): Feedback Pin. Receives the feed-

back voltage from an external resistive divider across the

output.

VOUT (Pin 5) (LTC3406-1.5/LTC3406-1.8): Output Volt-

age Feedback Pin. An internal resistive divider divides the

output voltage down for comparison to the internal refer-

ence voltage.

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