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LTC1538-AUX 数据表(PDF) 7 Page - Linear Technology |
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LTC1538-AUX 数据表(HTML) 7 Page - Linear Technology |
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7 / 32 page  7 LTC1538-AUX/LTC1539 TYPICAL PERFORMANCE CHARACTERISTICS Auxiliary Regulator PSRR Auxiliary Regulator Sink Current Available AUX DR VOLTAGE (V) 0 0 5 10 15 20 24 6 8 1538/39 • G19 10 12 14 16 FREQUENCY (kHz) 10 100 90 80 70 60 50 40 30 20 10 0 100 1000 1538/39 • G20 IL = 10mA IL = 100mA PIN FUNCTIONS VIN: Main Supply Pin. Must be closely decoupled to the IC’s signal ground pin. INTVCC/5V STANDBY: Output of the Internal 5V Regulator and the EXTVCC Switch. The driver and control circuits are powered from this voltage. Must be closely decoupled to power ground with a minimum of 2.2 µF tantalum or electrolytic capacitor. The INTVCC regulator remains on when both RUN/SS1 and RUN/SS2 are low. Refer to the LTC1438/LTC1439 for applications which do not require a 5V standby regulator. EXTVCC: External Power Input to an Internal Switch. This switch closes and supplies INTVCC, bypassing the internal low dropout regulator whenever EXTVCC is higher than 4.8V. Connect this pin to VOUT of the controller with the higher output voltage. Do not exceed 10V on this pin. See EXTVCC connection in Applications Information section. BOOST 1, BOOST 2: Supplies to the Topside Floating Drivers. The bootstrap capacitors are returned to these pins. Voltage swing at these pins is from INTVCC to VIN + INTVCC. SW1, SW2: Switch Node Connections to Inductors. Volt- age swing at these pins is from a Schottky diode (external) voltage drop below ground to VIN. SGND: Small Signal Ground. Common to both controllers, must be routed separately from high current grounds to the (–) terminals of the COUT capacitors. PGND: Driver Power Ground. Connects to sources of bottom N-channel MOSFETs and the (–) terminals of CIN. SENSE – 1, SENSE – 2: Connects to the (–) input for the current comparators. SENSE– 1 is internally connected to the first controllers VOUT sensing point preventing true remote output voltage sensing operation. The first con- troller can only be used as a 3.3V or 5.0V regulator controlled by the VPROG1 pin. The second controller can be set to a 3.3V, 5.0V or an adjustable regulator controlled by the VPROG2 pin (see Table 1). Table 1. Output Voltage Table LTC1538-AUX LTC1539 CONTROLLER 1 5V or 3.3V Only, Secondary Feedback Loop CONTROLLER 2 Adjustable Only 5V/3.3V/Adjustable Remote Sensing Remote Sensing POR1 Output |
类似零件编号 - LTC1538-AUX_15 |
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类似说明 - LTC1538-AUX_15 |
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