LTC3405A-1.375_15 Datasheet, PDF (5/12 Pages) Linear Technology – 1.375V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT

LTC3405A-1.375
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
(From Figure 1a)
Load Step
V_OUT
100mV/DIV
AC
COUPLED
I_L
200mA/DIV
I_LOAD
200mA/DIV
V_IN = 3.6V
20µs/DIV
I_LOAD = 20mA TO 250mA
PULSE SKIPPING MODE
Load Step
V_OUT
100mV/DIV
AC
COUPLED
I_L
200mA/DIV
I_LOAD
200mA/DIV
3405A1375 G17
V_IN = 3.6V
20µs/DIV
I_LOAD = 20mA TO 250mA
Burst Mode OPERATION
Load Step
V_OUT
100mV/DIV
AC
COUPLED
I_L
200mA/DIV
I_LOAD
200mA/DIV
3405A1375 G18
V_IN = 3.6V
20µs/DIV
I_LOAD = 0mA TO 250mA
Burst Mode OPERATION
3405A1375 G19
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_OUT (Pin 5): Output Voltage Feedback Pin. An internal
resistive divider divides the output voltage down for com-
parison to the internal 0.9V reference voltage.
MODE (Pin 6): Mode Select Input. To select pulse skip-
ping mode, tie to V_IN. Grounding this pin selects Burst
Mode operation. Do not leave this pin floating.
3405a1375f
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