QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1243 HOT SWAP CONTROLLER WITH CURRENT AND VOLTAGE MONITOR LTC4215-1 DESCRIPTION Demonstration Circuit 1243A showcases the LTC4215- The DC1243A permits evaluating the LTC4215-1 during -1IUF positive low voltage Hot Swap controller with I2C turn-on and turn-off transients as well as during steady compatible monitoring in a 60W, 10.2 to 13.6V applica- state conditions. tion. Included on board is an input clamp, input and out- Design files for this circuit board are available. Call put voltage dividers for UV, OV, and PWRGD, LEDs to the LTC factory. indicate the presence of various voltages and signals , LTC and Hot Swap are registered trademarks of Linear Technology Corpora- and turret terminals for critical signals to facilitate tion. evaluation in a working system. Input and output con- nections are made by 93 mil turrets which if removed, accommodate insertion of up to 12 gauge wires for in- situ testing. An I2C port designed to interface with DC590A allows control of DC874 with LTC s QuickEval software. 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1243 HOT SWAP CONTROLLER WITH CURRENT AND VOLTAGE MONITOR Table 1. Performance Summary (T = 25C) A PARAMETER CONDITION VALUE Supply Voltage Rated operating limits 2.9V VCC 15V Under Voltage Lockout Transition to operating mode 2.75V V 2.89V DD(UVL) UV, OV, FB,EN Pin Threshold Voltage 1.215V V 1.255V TH Gate to Source Voltage V = 2.9V to 15V 4.7V V 6.5V DD GS Gate Pull-Up current Charge Pump On, V 0.2V 15A I 30A GATE GATE Normal Gate Pull-Down Current ON Pin Signal Low 0.8mA I 1.6mA GATE Circuit Breaker Threshold After Startup Timer Expired 22.5mV D V 27.5mV SENSE V =1.3V 22mV D V 29mV FB SENSE Current Limit Voltage V =0V 6.5mV D V 13mV FB SENSE Start-Up Timer Expired 65mV D V 90mV SENSE ADC Resolution (No missing codes) 8 VDD-Sense +/- 2.0 LSB ADC Offset SOURCE +/- 1 LSB ADIN +/- 1 LSB VDD-Sense 37.625mV V 39.275mV FS ADC Full-Scale Voltage (255 * V ) SOURCE 15.14 V 15.74 LSB FS ADIN 1.205 V 1.255 FS VDD-Sense +/- 5.5 LSB ADC Total Unadjusted Error SOURCE +/- 5 LSB ADIN +/- 5 LSB OPERATING PRINCIPLES The LTC4215-1 is a low voltage hot swap controller mum of 5.4A load current. The current limit and circuit that has a 2.9V to 15V operating range and a 24V ab- breaker thresholds can be adjusted by changing the solute maximum operating voltage for the VDD pin. sense resistor, RS. To enable demonstration of higher This demo circuit is populated for +12V operation, but current applications up to 20A, provisions have been it can easily be readjusted for any voltage between made to replace RS with a 1W, 2512 size sense resis- 2.9V and 15V by replacing R1, R2 and R7 (top resis- tor and replace Q1 with a MOSFET in a PowerPAK SO- tors in the UV/OV divider and the FB divider). The 8, such as the Si7880ADP. The large turrets may be DC1243A as supplied by the factory is populated with removed to permit installation of up to 12 gauge wire a Si4864DP MOSFET in an SO-8 package and a for direct, low resistance connections to the board. 4mW, 1/2W, current sense resistor, providing a mini- None of the turrets are swaged. 2