LTC1960 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range (Note 7), otherwise specifications are at TA = 25°C. VDCIN = 20V, VBAT1 = 12V, VBAT2 = 12V, unless otherwise noted. SYMBOL PARAMETERCONDITIONSMINTYPMAXUNITSSupply and Reference DCIN Operating Range DCIN Selected 6 28 V ICH DCIN Operating Current Not Charging (DCIN Selected) 1 1.5 mA Charging (DCIN Selected) 1.3 2 mA Battery Operating Voltage Range Battery Selected, PowerPath Function (Note 2) 6 28 V Battery Drain Current Battery Selected, Not Charging, VDCIN = 0V 175 µA VPLUS Diodes Forward Voltage: VFDC DCIN to VPLUS IVCC = 10mA 0.8 V VFB1 BAT1 to VPLUS IVCC = 0mA 0.7 V VFB2 BAT2 to VPLUS IVCC = 0mA 0.7 V VFSCN SCN to VPLUS IVCC = 0mA 0.7 V UVLO Undervoltage Lockout Threshold VPLUS Ramping Down, Measured at VPLUS l 3 3.5 3.9 V to GND UVHYS UV Lockout Hysteresis VPLUS Rising, Measured at VPLUS to GND 60 mV VVCC VCC Regulator Output Voltage 5 5.2 5.4 V VLDR VCC Load Regulation IVCC = 0mA to 10mA 0.2 1 % Switching Regulator VTOL Overall Voltage Accuracy 5V ≤ VOUT < 25V, (Note 3) –0.8 0.8 % l –1 1 % ITOL Overall Current Accuracy IDAC Value = 3FFHEX –5 5 % VCSP , VCSN = 12V l –6 6 % fOSC Regulator Switching Frequency 255 300 345 kHz fDO Regulator Switching Frequency in Low Duty Cycle ≥ 99% 20 25 kHz Dropout Mode DCMAX Regulator Maximum Duty Cycle 99 99.5 % IMAX Maximum Current Sense Threshold VITH = 2.2V 140 155 190 mV ISNS CA1 Input Bias Current VCSP = VCSN > 5V 150 µA CMSL CAI Input Common Mode Low 0 V CMSH CAI Input Common Mode High VDCIN–0.2 V VCL1 CL1 Turn-On Threshold 95 100 105 mV TGATE Transition Time: TG tr TGATE Rise Time CLOAD = 3300pF, 10% to 90% 50 90 ns TG tf TGATE Fall Time CLOAD = 3300pF, 10% to 90% 50 90 ns BGATE Transition Time: BG tr BGATE Rise Time CLOAD = 3300pF, 10% to 90% 50 90 ns BG tf BGATE Fall Time CLOAD = 3300pF, 10% to 90% 40 80 ns Trip Points VTR DCDIV/LOPWR Threshold VDCDIV or VLOPWR Falling l 1.166 1.19 1.215 V VTHYS DCDIV/LOPWR Hysteresis Voltage VDCDIV or VLOPWR Rising 30 mV IBVT DCDIV/LOPWR Input Bias Current VDCDIV or VLOPWR = 1.19V 20 200 nA VTSC Short-Circuit Comparator Threshold VSCP – VSCN, VCC ≥ 5V l 90 100 115 mV VFTO Fast PowerPath Turn-Off Threshold VDCDIV Rising from VCC 6 7 7.9 V VOVSD Overvoltage Shutdown Threshold as a Percent VSET Rising from 0.8V Until TGATE and 107 % of Programmed Charger Voltage BGATE Stop Switching Rev. C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit Timing Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
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