ltc3528-2 Linear Technology Corporation, ltc3528-2 Datasheet - Page 7

• Manufacturer Part Number: ltc3528-2
• Description: Ltc3528-2 - 1a, 2mhz Synchronous Step-up Dc/dc Converter In 2mm ? 3mm Dfn
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
SHDN (Pin 1): Logic Controlled Shutdown Input. There is
an internal 4M pull-down resistor on this pin.
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:
PGOOD (Pin 3): Power Good Comparator Output. This
open-drain output is low when V
lation voltage.
V
of the Internal Synchronous Rectifier. PCB trace length
from V
should be as short and wide as possible.
OUT
• SHDN = High: Normal operation
• SHDN = Low: Shutdown, quiescent current < 1µA
V
OUT
(Pin 4): Output Voltage Sense and Drain Connection
OUT
= 1.20V • 1+
to the output filter capacitor (4.7µF minimum)

 
R2
R1

 
FB
< 10% from its regu-
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 V
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.
V
soldered to the PCB ground plane. It serves as another
ground connection and as a means of conducting heat
away from the die.
SW (Pin 5): Switch Pin. Connect inductor between SW
and V
1µF ceramic decoupling capacitor from this pin to ground.
GND (Exposed Pad Pin 9): The exposed pad must be
IN
(Pin 8): Battery Input Voltage. Connect a minimum of
IN
. Keep PCB trace lengths as short and wide as
IN
to minimize EMI.
LTC3528-2
35282fa
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