LTC3406-1.5_15 Datasheet, PDF (5/16 Pages) Linear Technology – 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

LTC3406
LTC3406-1.5/LTC3406-1.8
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown
Load Step
RUN
2V/DIV
V_OUT
2V/DIV
I_LOAD
500mA/DIV
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 600mA
40µs/DIV
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3406 G16
V_IN = 3.6V
20µs/DIV
V_OUT = 1.8V
I_LOAD = 0mA TO 600mA
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3406 G17
V_IN = 3.6V
20µs/DIV
V_OUT = 1.8V
I_LOAD = 50mA TO 600mA
3406 G18
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
V_IN = 3.6V
20µs/DIV
V_OUT = 1.8V
I_LOAD = 100mA TO 600mA
3406 G19
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
V_IN = 3.6V
20µs/DIV
V_OUT = 1.8V
I_LOAD = 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.
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) (LTC3406): Feedback Pin. Receives the feed-
back voltage from an external resistive divider across the
output.
V_OUT (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.
3406fa
5