LTC3531-3 Linear Technology, LTC3531-3 Datasheet - Page 7

• Manufacturer Part Number: LTC3531-3
• Description: Buck-Boost Synchronous DC/DC Converters
• Manufacturer: Linear Technology

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PI FU CTIO S
SW2 (Pin 1/Pin 7): Buck-Boost Switch Pin Where Internal
Switches C and D are Connected. An optional Schottky
diode can be connected from SW2 to V
effi ciency improvement. Minimize trace length to keep
EMI down.
GND (Pin 2/Pin 3): Signal Ground for the IC.
PGND (Pin 2/Pin 8): Power Ground for the IC. (Shared
on ThinSOT version)
V
Rectifi er. A fi lter capacitor is placed from V
A ceramic bypass capacitor is recommended as close to
the V
⎯ S ⎯ H ⎯ D ⎯ N (Pin 4/Pin 4): External Shutdown Pin. An applied
voltage of < 0.4V shuts down the converter. A voltage
above >1.4V will enable the converter.
OUT
U
(Pin 3/Pin 6): Output of the Buck-Boost Synchronous
OUT
and GND pins as possible.
U
U
ThinSOT/DFN Packages
OUT
for a moderate
OUT
to GND.
V
Converter. A minimum 2.2µF Ceramic Capacitor should
be placed between V
FB (NA/Pin 5): Feedback Pin for the Adjustable Version.
Connect the resistor divider tap here. The output voltage
can be adjusted from 2V to 5V.
SW1 (Pin 6/Pin 1): Buck-Boost Switch Pin Where Internal
Switches A and B are Connected. Connect the inductor
from SW1 to SW2.
Exposed Pad (Pin 9, DFN): Solder to PCB ground for
optimal thermal performance.
IN
V
(Pin 5/Pin 2): Input Supply Pin for the Buck-Boost
OUT
LTC3531-3.3/LTC3531-3
=
1 225 1
.
⎛
⎝ ⎜
+
IN
R
R
and GND.
2
1
⎞
⎠ ⎟
LTC3531/
7
3531f