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| LTC3408_15 Datasheet, PDF (5/12 Pages) Linear Technology – 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor | |||
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TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1)
LTC3408
Output Ripple Waveform
Load Step Response
VOUT
10mV/DIV
IL
100mA/DIV
VIN = 3.6V
VREF = 0.6V
ILOAD = 0A
200ns/DIV
REF Transient
VREF
0.5V/DIV
3408 G16
VOUT
1V/DIV
VIN = 4.2V
40µs/DIV
VREF = 0V TO 1.4V
RLOAD = 5â¦
3408 G18
VOUT
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20µs/DIV
VREF = 0.6V
ILOAD = 0mA TO 600mA
3408 G17
VOUT vs VREF
4.5
VIN = 4.2V
4.0
3.5
IL = 100mA
IL = 600mA
3.0
2.5
2.0
1.5
1.0
0.5
0
0
0.5
1.0
VREF (V)
1.5
3408 G19
PI FU CTIO S
VOUT (Pins 1, 8): Output Voltage Feedback Pin. An internal
resistive divider divides the output voltage down by 3 for
comparison to the external reference voltage. The drain of
the P-channel bypass MOSFET is connected to this pin.
VIN (Pins 2, 7): Main Supply Pin. Must be closely de-
coupled to GND, Pin 3, with a 10µF or greater ceramic
capacitor.
GND (Pin 3): Ground Pin.
SW (Pin 4): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
RUN (Pin 5): 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.
REF (Pin 6): External Reference Input. Controls the output
voltage to 3Ã the applied voltage at REF. Also turns on the
bypass MOSFET when VREF > 1.2V.
Exposed Pad (Pin 9): Connect to GND, Pin 3.
3408f
5
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