ltc3406ab Linear Technology Corporation, ltc3406ab Datasheet - Page 5

• Manufacturer Part Number: ltc3406ab
• Description: 1.5mhz, 600ma Synchronous Step-down Regulator In Thinsot
• Manufacturer: Linear Technology Corporation

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