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LT1308BIS8-TR Datasheet(PDF) 6 Page - Linear Technology

Part # LT1308BIS8-TR
Description  High Current, Micropower Single Cell, 600kHz DC/DC Converters
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1308BIS8-TR Datasheet(HTML) 6 Page - Linear Technology

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LT1308A/LT1308B
1308abfa
VC (Pin 1/Pin 1): Compensation Pin for Error Amplifier.
Connect a series RC from this pin to ground. Typical
values are 47k
Ω and 100pF. Minimize trace area at VC.
FB (Pin 2/Pin 2): Feedback Pin. Reference voltage is
1.22V. Connect resistive divider tap here. Minimize trace
area at FB. Set VOUT according to:
VOUT = 1.22V(1 + R1/R2).
SHDN (Pin 3/Pin 3): Shutdown. Ground this pin to turn
off switcher. To enable, tie to 1V or more. SHDN does not
need to be at VIN to enable the device.
GND (Pin 4/Pins 4, 5, 6, 7): Ground. Connect directly to
local ground plane. Ground plane should enclose all
components associated with the LT1308. PCB copper
connected to these pins also functions as a heat sink. For
the TSSOP package, connect all pins to ground copper to
get the best heat transfer. This keeps chip heating to a
minimum.
PIN FUNCTIONS (SO/TSSOP)
SW (Pin 5/Pins 8, 9, 10): Switch Pins. Connect inductor/
diode here. Minimize trace area at these pins to keep EMI
down. For the TSSOP package, connect all SW pins
together at the package.
VIN (Pin 6/Pins 11, 12): Supply Pins. Must have local
bypass capacitor right at the pins, connected directly to
ground. For the TSSOP package, connect both VIN pins
together at the package.
LBI (Pin 7/Pin 13): Low-Battery Detector Input. 200mV
reference. Voltage on LBI must stay between –100mV
and 1V. Low-battery detector does not function with
SHDN pin grounded. Float LBI pin if not used.
LBO (Pin 8/Pin 14): Low-Battery Detector Output. Open
collector, can sink 50
μA. A 220kΩ pull-up is recom-
mended. LBO is high impedance when SHDN is grounded.


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