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LTC1504AIS8-3.3 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1504AIS8-3.3 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 12 page  4 LTC1504A PIN FUNCTIONS voltage. The LTC1504A feedback loop will servo the FB pin to 1.265V. SENSE (LTC1504A-3.3) (Pin 5): Output Voltage Sense. Connect directly to the output voltage node. The LTC1504A-3.3 feedback loop will servo SENSE to 3.3V. SENSE is connected to an internal resistor divider which will load any external dividers. For output voltages other than 3.3V, use the LTC1504A. SHDN (Pin 6): Shutdown, Active Low. When SHDN is at a logic High, the LTC1504A will operate normally. When SHDN is Low, the LTC1504A ceases all internal operation and supply current drops below 1 µA. In shutdown, the SW pin is pulled low. This ensures that the output is actively shut off when SHDN is asserted, but it prevents other supplies from providing power to the output when the LTC1504A is inactive. See the Applications Information section for more details. SS (Pin 7): Soft Start. Connect an external capacitor (usually 0.1 µF)fromSStoGNDtolimittheoutputrisetime during power-up. CSS also compensates the current limit loop, allowing the LTC1504A to enter and exit current limit cleanly. See the Applications Information section for more details. COMP (Pin 8): External Compensation. An external RC network should be connected to COMP to compensate the feedback loop. COMP is connected to the output of the internal error amplifier. IMAX (Pin 1): Current Limit Set. Connect a resistor from VCC to IMAX to set the current limit threshold. An internal 12 µA current source from IMAX to GND sets the voltage drop across this resistor. This voltage is compared to the voltage drop across the internal high-side switch (Q1) while it is turned on. See the Applications Information section for more information. To disable current limit, leave IMAX floating. VCC (Pin 2): Power Supply Input. Connect to a power supply voltage between 4V and 10V. VCC requires a low impedance bypass capacitor to ground, located as close as possible to the LTC1504A. See the Applications Infor- mation section for details on capacitor selection and placement. SW (Pin 3): Power Switch Output. This is the switched node of the buck circuit. Connect SW to one end of the external inductor. The other end of the inductor should be connected to COUT and becomes the regulated output voltage. Avoid shorting SW to GND or VCC. GND (Pin 4): Ground. Connect to a low impedance ground. The input and output bypass capacitors and the feedback resistor divider (adjustable parts only) should be grounded as close to this pin as possible. Pin 4 acts as a heat sink in the LTC1504A S0-8 package and should be connected to as large a copper area as possible to improve thermal dissipation. See the Thermal Considerations section for more information. FB (LTC1504A) (Pin 5): Feedback. Connect FB to a resistor divider from VOUT to GND to set the regulated output |
Similar Part No. - LTC1504AIS8-3.3 |
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Similar Description - LTC1504AIS8-3.3 |
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