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LT1308BIS8-TR Datasheet(PDF) 6 Page - Linear Technology |
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LT1308BIS8-TR Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page 6 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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