LTC3406B データシートの表示（PDF） - Linear Technology

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LTC3406B

1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

Linear Technology 

TYPICAL PERFOR A CE CHARACTERISTICS

(From Figure 1a Except for the Resistive Divider Resistor Values)

LTC3406B

Start-Up from Shutdown

Load Step

RUN

5V/DIV

VOUT

1V/DIV

IL

500mA/DIV

VOUT

100mV/DIV

AC COUPLED

IL

500mA/DIV

ILOAD

500mA/DIV

VIN = 3.6V

40µs/DIV

3406B G16

VOUT = 1.8V

ILOAD = 600mA (LOAD: 3Ω RESISTOR)

VIN = 3.6V

20µs/DIV

VOUT = 1.8V

ILOAD = 0mA TO 600mA

Load Step

Load Step

VOUT

100mV/DIV

AC COUPLED

IL

500mA/DIV

ILOAD

500mA/DIV

3406B G17

VIN = 3.6V

20µs/DIV

VOUT = 1.8V

ILOAD = 50mA TO 600mA

Load Step

3406B G18

VOUT

100mV/DIV

AC COUPLED

IL

500mA/DIV

ILOAD

500mA/DIV

VIN = 3.6V

20µs/DIV

VOUT = 1.8V

ILOAD = 100mA TO 600mA

3406B G19

VOUT

100mV/DIV

AC COUPLED

IL

500mA/DIV

ILOAD

500mA/DIV

VIN = 3.6V

20µs/DIV

VOUT = 1.8V

ILOAD = 200mA TO 600mA

3406B G20

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.

VFB (Pin 5) (LTC3406B): Feedback Pin. Receives the

feedback voltage from an external resistive divider across

the output.

VOUT (Pin 5) (LTC3406B-1.5/LTC3406B-1.8): Output Volt-

age Feedback Pin. An internal resistive divider divides the

output voltage down for comparison to the internal refer-

ence voltage.

3406bfa

5

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