Demonstration circuit 2922A-A and 2922A-B are dual step-down DC/DC converters featuring the LTC7802 or LTC7802-3.3 PWM controllers. Both controller IC’s used on these demo boards are 40V Low IQ, Dual, 2-Phase Synchronous Step-Down Controllers with Spread Spectrum. And both demo boards operate over a 5V to 36V input voltage range and provide a 3.3V at 20A and 5V at 15A outputs.
The DC2922A-A uses the LTC7802 and has a resistor divider network to set the 3.3V output. The DC2922A-B uses the LTC7802-3.3 and has a fixed 3.3V output that does not require the resistor divider network.
Some of the key features of both boards include a FREQUENCY jumper for spread-spectrum or external clock option, and EXTVCC jumper for VOUT2, EXTVCC, or input derived VCC, a MODE jumper that allows the converter to run in FCM, pulse-skipping, or Burst Mode® operation and PGOOD signals for each output.
The two channels can be paralleled for higher output current. See the respective data sheets for more information on setting-up the board for paralleling both outputs. The LTC7802 and LTC7802-3.3 data sheets give a complete description of these devices, their operation and application information, and must be read in conjunction with the DC2922A demo manual prior to working on or modifying these demo circuits.
Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.