| SYMBOL | PARAMETER | CONDITIONS | MIN TYP MAX | UNITS |
| IDD | V12VIN Supply Current | ON = GND, ON = 3V | q | 3.5 8 | mA |
| VLKO | Undervoltage Lockout | 12VIN 3VIN 5VIN | q | 7 9.5 10.8 2.25 2.5 2.75 2.25 2.5 2.75 | V V V |
| VFB | Foldback Current Limit Voltage | VFB = (V5VIN - V5VSENSE), V5VOUT = OV VFB = (V5VIN - V5VSENSE), V5VOUT > 4V VFB = (V3VIN - V3VSENSE), V3VOUT = OV VFB = (V3VIN - V3VSENSE), V3VOUT > 2V | q | 4 7.5 12 40 53 65 4 7.5 12 40 53 65 | mV mV mV mV |
| tCB | Circuit Breaker Trip Filter Time | | | 14.6 | s |
| IcP | GATE Pin Output Current | Charge Pump On, VGATE = GND, FAULT = High Charge Pump Off, VGATE = 5V, FAULT = High Charge Pump Off, VGATE = 2V, FAULT = Low | q | -20 -62 -100 200 3 17.5 | ccA ccA mA |
| O\/GATE | External Gate Voltage | (V12VIN - VGATE) | | 1 00 200 | mV |
| VDROP | Internal Switch Voltage Drop | (V12VIN - V12VOUT), OIC " TA " 70rC 112VOUT = 500mA -40rC " TA " 85rC | q | 225 600 225 750 | mV |
| (VEEOUT - VEEIN), IVEEIN = lOOrTiA | q | 1 25 250 | mV |
| IcL | Current Foldback | 12VIN = 12V, 12VOUT = OV 1 2VIN = 1 2V, 12VOUT = 1 0V VEEIN = -1 2V, VEEOUT = OV (LTC1 643AL/LTC1 643AH Only) VEEIN = -12V, VEEOUT = -10V | q | 50 250 600 525 850 1500 50 160 500 225 450 800 | mA mA mA mA |
| TTS | Thermal Shutdown Temperature | | | 1 50 | ][c |
| VTH | Power-Good Threshold Voltage | V12VOUT OIC " TA " 70rC LTC1643AH/LTC1643AL Only -40rC " TA " 85rC | q | 10.8 11.1 11.4 10.4 11.1 11.4 | V V |
| VEEOUT OIC " TA " 70rC LTC1643AH/LTC1643AL Only -40rC " TA " 85rC | q | -10.2 -10.5 -10.8 -10.0 -10.5 -10.8 | V V |
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