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LTC3405A-1.5 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3405A-1.5
Description  1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3405A-1.5 Datasheet(HTML) 5 Page - Linear Technology

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LTC3405A-1.5/LTC3405A-1.8
3405a1518fa
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.
VIN (Pin 4): Main Supply Pin. Must be closely decoupled
to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
VOUT (Pin 5): Output Voltage Feedback Pin. An internal
resistive divider divides the output voltage down for com-
parison to the internal 1.2V reference voltage.
MODE (Pin 6): Mode Select Input. To select pulse skip-
ping mode, tie to VIN. Grounding this pin selects Burst
Mode operation. Do not leave this pin floating.
3405A1518 G20
VOUT
100mV/DIV
AC
COUPLED
ILOAD
200mA/DIV
IL
200mA/DIV
40µs/DIV
VIN = 3.6V
VOUT = 1.8V
ILOAD = 20mA TO 250mA
PULSE SKIPPING MODE
VOUT
100mV/DIV
AC
COUPLED
ILOAD
200mA/DIV
IL
200mA/DIV
3405A1518 G21
40µs/DIV
VIN = 3.6V
VOUT = 1.8V
ILOAD = 20mA TO 250mA
Burst Mode OPERATION
3405A1518 G22
40µs/DIV
VIN = 3.6V
VOUT = 1.8V
ILOAD = 0mA TO 250mA
Burst Mode OPERATION
VOUT
100mV/DIV
AC
COUPLED
ILOAD
200mA/DIV
IL
200mA/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
Load Step
Load Step
Load Step
(From Figure 1a)


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