LTC3544B 데이터 시트보기 (PDF) - Linear Technology

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LTC3544B

Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA

Linear Technology 

LTC3544B

Pin Functions

VFB200B (Pin 1): 200mA Regulator B Feedback Pin. This

pin receives the feedback voltage from an external resistive

divider across the output.

VFB200A (Pin 2): 200mA Regulator A Feedback Pin. This

pin receives the feedback voltage from an external resistive

divider across the output.

RUN200A (Pin 3): 200mA Regulator A Enable Pin. Forcing

this pin to VIN enables the 200mA regulator (channel A),

while forcing it to GND causes the regulator to shut off.

SW200B (Pin 4): Switch Node Connection to Inductor for

200mA Regulator B. This pin connects to the drains of the

internal power MOSFET switches.

SW200A (Pin 5): Switch node Connection to Inductor for

200mA Regulator A. This pin connects to the drains of the

internal power MOSFET switches.

PGND (Pin 6): Power Path Return Pin for Both 200mA

Regulators and the 300mA Regulator.

PVIN (Pin 7): Power Path Supply Pin for Both 200mA

Regulators and the 300mA Regulator. This pin must

be closely decoupled to PGND, with a 4.7µF or greater

ceramic capacitor.

SW300 (Pin 8): Switch Node Connection to Inductor for

300mA Regulator. This pin connects to the drains of the

internal power MOSFET switches.

RUN300 (Pin 9): 300mA Regulator Enable Pin. Forcing

this pin to VIN enables the 300mA regulator, while forcing

it to GND causes the regulator to shut off.

VFB300 (Pin 10): 300mA Regulator Feedback Pin. This pin

receives the feedback voltage from an external resistive

divider across the output.

VFB100 (Pin 11): 100mA Regulator Feedback Pin. This pin

receives the feedback voltage from an external resistive

divider across the output.

RUN100 (Pin 12): 100mA Regulator Enable Pin. Forcing

this pin to VIN enables the 100mA regulator, while forcing

it to GND causes the 100mA regulator to shut off.

SW100 (Pin 13): Switch Node Connection to Inductor for

100mA Regulator. This pin connects to the drains of the

internal power MOSFET switches.

GNDA (Pin 14, Exposed Pad Pin 17): Ground Pin for In-

ternal Reference, Control Circuitry, and the Current Path

Return for 100mA Regulator. The exposed pad must be

soldered to PCB ground for electrical connection and rated

thermal performance.

VCC (Pin 15): Supply Pin for Internal Reference and Control

Circuitry. Power path supply pin for the 100mA regulator.

RUN200B (Pin 16): 200mA Regulator B Enable Pin. Forcing

this pin to VIN enables the 200mA regulator (channel B),

while forcing it to GND causes the regulator to shut off.

3544bfb



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