Datasheet LTC3406, LTC3406-1.5, LTC3406-1.8 (Analog Devices) - 5

LTC3406 LTC3406-1.5/LTC3406-1.8
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Start-Up from Shutdown Load Step Load Step
VOUT RUN 100mV/DIV VOUT 2V/DIV AC COUPLED 100mV/DIV VOUT AC COUPLED 2V/DIV IL IL 500mA/DIV 500mA/DIV ILOAD 500mA/DIV ILOAD ILOAD 500mA/DIV 500mA/DIV V 40 3406 G16 V 20 3406 G17 V 20 3406 G18 IN = 3.6V µs/DIV IN = 3.6V µs/DIV IN = 3.6V µs/DIV V V V OUT = 1.8V OUT = 1.8V OUT = 1.8V I I I LOAD = 600mA LOAD = 0mA TO 600mA LOAD = 50mA TO 600mA
Load Step Load Step
VOUT VOUT 100mV/DIV 100mV/DIV AC COUPLED AC COUPLED IL IL 500mA/DIV 500mA/DIV ILOAD ILOAD 500mA/DIV 500mA/DIV V 20 3406 G19 IN = 3.6V µs/DIV V 20 3406 G20 IN = 3.6V µs/DIV VOUT = 1.8V VOUT = 1.8V ILOAD = 100mA TO 600mA ILOAD = 200mA TO 600mA
U U U PI FU CTIO S RUN (Pin 1):
Run Control Input. Forcing this pin above
VIN (Pin 4):
Main Supply Pin. Must be closely decoupled 1.5V enables the part. Forcing this pin below 0.3V shuts to GND, Pin 2, with a 2.2µF or greater ceramic capacitor. down the device. In shutdown, all functions are disabled
V
drawing <1µA supply current. Do not leave RUN floating.
FB (Pin 5) (LTC3406):
Feedback Pin. Receives the feed- back voltage from an external resistive divider across the
GND (Pin 2):
Ground Pin. output.
SW (Pin 3):
Switch Node Connection to Inductor. This pin
VOUT (Pin 5) (LTC3406-1.5/LTC3406-1.8):
Output Volt- connects to the drains of the internal main and synchro- age Feedback Pin. An internal resistive divider divides the nous power MOSFET switches. output voltage down for comparison to the internal refer- ence voltage. 3406fa 5