LTC3544BEUD datasheet(6/16 Pages) LINER

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LTC3544B

3544bfa

PIN FUNCTIONS

TYPICAL PERFORMANCE CHARACTERISTICS

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): Ground Pin for Internal Reference and Con-

trol Circuitry. Power path return for the 100mA regulator.

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.

Exposed Pad (Pin 17): Ground. Must be soldered to PCB.

PFET RDS(ON) vs Temperature

NFET RDS(ON) vs Temperature

TEMPERATURE (

°C)

–50

0.1

0.3

0.4

0.5

1.0

0.7

–10

3544B G18

0.2

0.8

0.9

0.6

–30

VIN = 3.6V

300

200 (B)

200 (A)

100

TEMPERATURE (

°C)

–50

0.2

0.3

0.4

0.5

0.6

0.7

3544B G19

0.8

0.9

1.0

VIN = 3.6V

0.1

100

300

200 (B)

200 (A)

100

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