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LTC3802EGN Datasheet(PDF) 8 Page - Linear Technology |
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LTC3802EGN Datasheet(HTML) 8 Page - Linear Technology |
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8 / 28 page  LTC3802 8 3802f TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Temperature Supply Current vs Supply Voltage TEMPERATURE ( °C) –50 –25 0.1 1 10 0 25 50 75 100 125 3802 G26 0.01 IVCC IPVCC (NO LOAD) IVCC SHUTDOWN IBOOST1 IBOOST2 (NO LOAD) VCC = VPVCC = VBOOST – VSW = 5V SUPPLY VOLTAGE (V) 3 0.01 1 10 45 3.5 4.5 5.5 6 3802 G27 0.1 TA = 25°C IVCC IPVCC (NO LOAD) IVCC SHUTDOWN IBOOST1, IBOOST2 (NO LOAD) PI FU CTIO S (28-Pin SSOP/32-Pin QFN Package) PVCC (Pin 1/Pin 29): Driver Power Supply Input. PVCC provides power to the two BG drivers and must be con- nected to an external voltage high enough to fully turn on the external MOSFETs, QB1 and QB2. PVCC requires at least a 10 µF bypass capacitor directly to PGND. BG1 (Pin 2/Pin 30): Channel 1 Controller Bottom Gate Drive. The BG1 pin drives the gate of the bottom N-channel synchronous switch MOSFET, QB1. BG1 is designed to drive typically up to 10,000pF of gate capacitance. BOOST1 (Pin 3/Pin 31): Channel 1 Controller Top Gate Driver Supply. BOOST1 should be bootstrapped to SW1 with a 0.1 µF capacitor. An external Schottky diode from PVCC to BOOST1 creates a complete floating charge- pumped supply at BOOST1. No other external supplies are required. TG1 (Pin 4/Pin 32): Channel 1 Controller Top Gate Drive. The TG1 pin drives the top N-channel MOSFET with a voltage swing equal to PVCC superimposed on the switch node voltage SW1. TG1 is designed to drive typically up to 6000pF of gate capacitance. SW1 (Pin 5/Pin 1): Channel 1 Controller Switching Node. Connect SW1 to the switching node of the channel 1 converter. When the bottom MOSFET QB1 turns on, the current limit comparator and the burst comparator monitor the voltage at SW1. If the voltage drop across MOSFET QB1 is too large, the controller enters current limit; if it is too small, the switcher enters Burst Mode operation. See Current Limit and Burst Mode Applica- tions Information. PGND (Pin 6/Pins 2, 3, 23, 24): Power Ground. The BG drivers return to this pin. Connect PGND to a high current ground node in close proximity to the sources of external MOSFETs QB1 and QB2 and the VIN, PVCC and VOUT bypass capacitors. IMAX1 (Pin 7/Pin 4): Channel 1 Controller Current Limit Set. The IMAX1 pin has an internal 10µA current source pull-up, allowing the current limit and burst comparator threshold to be programmed by a single external resistor to SGND. See Current Limit and Burst Mode Applications Information. |
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