LTC1760 TYPICAL PERFORMANCE CHARACTERISTICSEfficiency vs Charging CurrentLoad DumpLoad Regulation 100 14 BAT1 12.4 90 OUTPUT 12 12.3 80 VIN = 20V VDAC = 12.29V 12.2 70 10 IDAC = 3000mA 60 LOAD CURRENT = 1A 12.1 8 TA = 25°C 50 12.0 40 6 LOAD EFFICIENCY (%) 11.9 30 BAT1 VOLTAGE (V) CONNECTED BAT1 VOLTAGE (V) 4 11.8 V 20 IN = 20V V 2 LOAD DAC = 12.288V 10 DISCONNECTED 11.7 IDAC = 4000mA TA = 25°C 0 0 11.6 0 0.025 0.10 0.50 2.5 4.0 –4 –2 0 2 4 6 8 10 12 14 16 0 1000 2000 3000 4000 IOUT (A) TIME (ms) CHARGE CURRENT (mA) 1760 G07 1760 G08 1760 G09 PowerPath Switching 1 and 2SMBus Accelerator Operation 16 CLOAD = 20F VCC = 5V 15 ILOAD = 0.8A 5V CLD = 200pF T T 14 A = 25°C A = 25°C 13 12 LTC1760 11 10 RPULLUP = 15k LOAD VOLTAGE (V) 9 LOPWR 0V 8 THRESHOLD 7 6–50 –40 –30 –20 –10 0 10 20 30 40 50 1µs/DIV TIME (µs) 1960 G10 1760 G11 PIN FUNCTIONS Input Power Related side) of the sense resistor, RSC, in series with the three SCN (Pin 4): PowerPath Current Sensing Negative Input. PowerPath switch pairs, for detecting short-circuit cur- This pin should be connected directly to the “bottom” rent events. (output side) of the sense resistor, RSC, in series with the GDCO (Pin 6): DCIN Output Switch Gate Drive. Together three PowerPath switch pairs, for detecting short-circuit with GDCI, this pin drives the gate of the P-channel switch current events. Also powers the LTC1760 internal circuitry in series with the DCIN input switch. when all other sources are absent. GDCI (Pin 7): DCIN Input Switch Gate Drive. Together with SCP (Pin 5): PowerPath Current Sensing Positive Input. GDCO, this pin drives the gate of the P-channel switch This pin should be connected directly to the “top” (switch connected to the DCIN input. 1760fc For more information www.linear.com/LTC1760 9
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