DC1051A

DC1051A demonstration circuit includes two separate circuits for performance evaluation of the LTC®4217 2A integrated Hot Swap™ controller. This integrated circuit includes a power MOSFET to save board area and to minimize external component count. The standard version of the controller (LTC4217) is intended to operate with 2.9V to 26.5V rails, while the LTC4217-12 has internal adjustment for 12V applications. The circuit of DC1051A located on upper board area is assembled with LTC4217 configured for operation with a 24V rail. The lower circuit includes LTC4217-12. Current limit features of both circuits are identical with 5% accuracy and distinctive foldback property. The LTC4217 features a ground-referred current monitor. The current monitor sources a current that is proportional to the sense voltage and it may be converted to a voltage signal with an appropriate resistor. The current limit may be reduced by placing an external resistor between GND and the ISET pin.

• Input supply range from 19.9 to 26.3V (24V circuit), 9.88 to 15.05V (12V circuit)
• 1.235ms timer period (24V circuit) and 1.235ms timer period (12V circuit) at VTIMER Rising
• 900µF typ maximal load capacitance CMAX24 (at for successful power-up)
• 1000µF typ maximal load capacitance CMAX12 (at for successful power-up)
• LTC4217 is suited for low voltage applications such as hot board insertion and removal
• LTC4217 has a rich set of features to support Hot Swap applications
• Integrated power MOSFET for a compact Hot Swap solution
• 2% accurate undervoltage and overvoltage protection, load current monitoring
• Adjustable 5% accurate current limit, adjustable inrush current control, power good signaling
• Adjustable current limit timer before power is turned off