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| LTC3406AB-2_15 Datasheet, PDF (5/16 Pages) Linear Technology – 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown
Load Step
LTC3406AB-2
Load Step
RUN
2V/DIV
VOUT
2V/DIV
IL
500mA/DIV
VIN = 3.6V
400μs/DIV
VOUT = 1.8V
ILOAD = 600mA (3Ω RES)
VOUT
200mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
3406AB2 G16
VIN = 3.6V
20µs/DIV
VOUT = 1.8V
ILOAD = 0mA TO 600mA
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
3406AB2 G17
VIN = 3.6V
20µs/DIV
VOUT = 1.8V
ILOAD = 50mA TO 600mA
3406AB2 G18
Load Step
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 1.8V
ILOAD = 100mA TO 600mA
Load Step
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
3406AB2 G19
VIN = 3.6V
20µs/DIV
VOUT = 1.8V
ILOAD = 200mA TO 600mA
Discontinuous Operation
SW
2V/DIV
VOUT
20mV/DIV
AC COUPLED
IL
200mA/DIV
3406AB2 G20
VIN = 3.6V
VOUT = 1.8V
ILOAD = 25mA
400ns/DIV
3406AB2 G21
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 ï¬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.
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): Feedback Pin. Receives the feedback voltage
from an external resistive divider across the output.
3406ab2f
5
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