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LTC1438IG Datasheet(PDF) 7 Page - Linear Technology |
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LTC1438IG Datasheet(HTML) 7 Page - Linear Technology |
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7 / 32 page  7 LTC1438/LTC1439 TYPICAL PERFORMANCE CHARACTERISTICS Auxiliary Regulator Sink Current Available Auxiliary Regulator PSRR AUX DR VOLTAGE (V) 0 0 5 10 15 20 24 6 8 1438 G19 10 12 14 16 FREQUENCY (kHz) 10 10 20 30 40 50 60 70 100 1000 1438 G20 10mA LOAD 100mA LOAD PIN FUNCTIONS VIN: Main Supply Pin. Must be closely decoupled to the IC’s signal ground pin. INTVCC: Output of the Internal 5V Regulator and the EXTVCC Switch. The driver and control circuits are pow- ered from this voltage. Must be closely decoupled to power ground with a minimum of 2.2 µF tantalum or electrolytic capacitor. The INTVCC regulator turns off when both RUN/SS1 and RUN/SS2 are low. Refer to the LTC1538/ LTC1539 for 5V keep-alive applications. 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 4.7V. 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 control- lers, 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. Except for the LTC1438-ADJ, SENSE – 1 is internally connected to the first controller’s VOUT sensing point. The first controller can only be used as a 3.3V or 5.0V regulator controlled by the VPROG1 pin with the LTC1438, LTC1438X and LTC1439. The LTC1438-ADJ Controller 1 implements a remote sensing adjustable regulator. 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 LTC1438-ADJ LTC1438/LTC1438X LTC1439 Controller 1 Adjustable Only 5V or 3.3V Only Secondary Feedback Loop Controller 2 Adjustable Only Adjustable Only 5V/3.3V/Adjustable Remote Sensing Remote Sensing Remote Sensing POR2 Output POR2 Output POR2 Output |
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