DC1899A-A

DC1899A-A is a demonstration circuit featuring the LTC4228-1 dual ideal diode and Hot Swap™ controller. DC1899A facilitates evaluation of LTC4228 performance in different operation modes such as supply ramp-up, power supply switchover, steady state, and overcurrent faults. Power supply switchover mode can be realized as either an ideal diode or as a prioritizer. Each DC1899A circuit is assembled to operate with a 12V supply and 9A maximum current load. The main components of the board are the LTC4228 controller, two MOSFETs operating as ideal diodes, two MOSFETs operating as Hot Swap devices, 2 current sense resistors, 2 jumpers for independently enabling each rail, six LEDs to indicate status, power good and fault conditions separately for each channel, input voltage snubbers. There are pads for optional RC circuits for each Hot Swap MOSFET gate in order to adjust output voltage slew rate.

• 2.9V to 18V input supply range
• 2.1V to 2.3V internal VCC undervoltage lockout at INTVCC rising
• 10mV to 40mV forward regulation voltage (VIN – VOUT) ΔVFWD(REG)
• 47.5mV to 52.5mV circuit-breaker trip sense voltage ΔVSENSE(CB)
• 55mV to 75mV active current limit sense voltage ΔVSENSE(ACL)