Datasheet

LTC3406AB
5
3406abfa
PIN FUNCTIONS
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 fl oating.
GND (Pin 2): Ground Pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchronous
power MOSFET switches.
V
IN
(Pin 4): Main Supply Pin. Must be closely decoupled to
GND, Pin 2, with a 2.2μF or greater ceramic capacitor.
V
FB
(Pin 5): Feedback Pin. Receives the feedback voltage
from an external resistive divider across the output.
TYPICAL PERFORMANCE CHARACTERISTICS
(From Front Page Figure Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown Load Step Load Step
Load Step Load Step Discontinuous Operation
RUN
2V/DIV
V
OUT
1V/DIV
I
LOAD
500mA/DIV
400μs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 600mA (3Ω RES)
3406B G31
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20μs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 600mA
3406B G32
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20μs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA TO 600mA
3406B G33
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20μs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA TO 600mA
3406B G34
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20μs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 200mA TO 600mA
3406B G35
V
OUT
20mV/DIV
AC COUPLED
SW
(2V/DIV)
I
L
200mA/DIV
500ns/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 25mA
3406B G36