LTC3528-2 데이터 시트보기 (PDF) - Linear Technology

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LTC3528-2

1A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm × 3mm DFN

Linear Technology 

LTC3528-2

PIN FUNCTIONS

SHDN (Pin 1): Logic Controlled Shutdown Input. There is

an internal 4M pull-down resistor on this pin.

• SHDN = High: Normal operation

• SHDN = Low: Shutdown, quiescent current < 1µA

FB (Pin 2): Feedback Input. Connect resistor divider tap

to this pin. The output voltage can be adjusted from 1.6V

to 5.25V by:

VOUT

=

1.20V

•

1+

R2

R1

PGOOD (Pin 3): Power Good Comparator Output. This

open-drain output is low when VFB < 10% from its regu-

lation voltage.

VOUT (Pin 4): Output Voltage Sense and Drain Connection

of the Internal Synchronous Rectifier. PCB trace length

from VOUT to the output filter capacitor (4.7µF minimum)

should be as short and wide as possible.

SW (Pin 5): Switch Pin. Connect inductor between SW

and VIN. Keep PCB trace lengths as short and wide as

possible to reduce EMI. If the inductor current falls to

zero, or SHDN is low, an internal anti-ringing switch is

connected from SW to VIN to minimize EMI.

PGND (Pin 6): Power Ground. Provide a short direct PCB

path between PGND and the (–) side of the input and

output capacitors.

SGND (Pin 7): Signal Ground. Provide a short direct PCB

path between SGND and the (–) side of the input and

output capacitors.

VIN (Pin 8): Battery Input Voltage. Connect a minimum of

1µF ceramic decoupling capacitor from this pin to ground.

GND (Exposed Pad Pin 9): The exposed pad must be

soldered to the PCB ground plane. It serves as another

ground connection and as a means of conducting heat

away from the die.

35282fb

7

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