LTC3521IFE Просмотр технического описания (PDF) - Linear Technology

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LTC3521IFE

1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

Linear Technology 

LTC3521

Pin Functions (FE/UF Packages)

PVIN1 (Pin 13/Pin 11): High current power supply connec-

tion used to supply switch A of the buck-boost converter.

This pin should be bypassed by a 4.7µF, or larger, ceramic

cap. The bypass capacitor should be placed as close to

the pin as possible and should have a short return path

to ground. Pins VIN, PVIN1, and PVIN2 must be connected

together in the application circuit.

NC (Pin 13, UF Package Only): No Internal Connection.

SW1B (Pin 14/Pin 14): Buck-Boost Switch Node. This pin

must be connected to one side of the buck-boost inductor.

SW1A (Pin 15/Pin 15): Buck-Boost Switch Node. This pin

must be connected to one side of the buck-boost inductor.

VOUT1 (Pin 16/Pin 16): Buck-Boost Output Voltage Node.

This pin should be connected to a low ESR ceramic ca-

pacitor. The capacitor should be placed as close to the

IC as possible and should have a short return to ground.

SW3 (Pin 17/Pin 17): Buck converter Switch Node. This

pin must be connected to the opposite side of the inductor

connected to VOUT3.

PGND2 (Pin 18/Pin 18): High Current Ground Connection

for Both Buck Converters. The PCB trace connecting this pin

to ground should be made as short and wide as possible.

SW2 (Pin 19/Pin 20): Buck Converter Switch Node. This

pin must be connected to the opposite side of the inductor

connected to VOUT2.

NC (Pin 19, UF Package Only): No Internal Connection.

PVIN2 (Pin 20/Pin 22): High Current Power Supply Connec-

tion Used to Supply the Buck Converter Power Switches.

This pin should be bypassed by a 10µF or larger ceramic

cap. The bypass capacitor should be placed as close to

the pin as possible and should have a short return path

to ground. Pins VIN, PVIN1, and PVIN2 must be connected

together in the application circuit.

PGND1A (Exposed Pad Pin 21/Pin 21, Exposed Pad

Pin 25): High Current Ground Connection for the Buck-

Boost Switch B. The PCB trace connecting this pin to

ground should be made as short and wide as possible.

PGND1B (Pin 12, UF Package Only): High Current Ground

Connection for the Buck-Boost Switch C. The PCB trace

connecting this pin to ground should be made as short

and wide as possible.

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For more information www.linear.com/LTC3521

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