DC948A

DC948A demonstration circuit board is intended to evaluate the performance of the LTC2926 MOSFET controlled power supply tracker. The board contains one LTC2926 tracker, three power MOSFETs for tracking and sequencing three power supply rails, a few resistors for configuring tracking profiles and one small signal MOSFET for voltage drop compensation in the “host” rail. As assembled, DC948A operates with +5.0V as the “host” rail, and +3.3V and +2.5V as ”server” rails. The board features “host” supply slew rate of SM =100V/s, and “server” supply slew rates of SS =150V/s. The first “server” supply power up starts 12.5ms later than “host” supply and second “server” starts 25ms later. The LTC2926 is designed to provide compensation for voltage drop across each power MOSFET and its traces, when an individual power supply is used for each rail.

• 2.9V to 5.5V input supply voltage range (operating range)
• 2.4V typical input supply undervoltage lockout (VCC RISING)
• 1.23V typical ON pin threshold voltage (VON rising)
• 0.500V ON pin fault clear threshold voltage (VON FALLING)
• 5.0V typical host supply voltage
• 3.3V typical server supply 1 voltage
• 2.5V typical server supply 2 voltage
• 100V/s typical host gate voltage slew rate
• 150V/s typical server supply 1 slew rate and 150V/s typical server supply 2 slew rate
• 20mA typical server supply minimal load current