LT8603 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. VIN = 12V, EN/UVLO = 3V unless otherwise noted. (Note 2) PARAMETERCONDITIONSMINTYPMAXUNITSChannel 2 Feedback Voltage FB2 E-, I-Grade l 0.985 1 1.015 V J-Grade l 0.98 1 1.015 V Input Current FB2 l –100 100 nA FB2 Line Regulation VIN = 3V to 42V 0.002 0.01 %/V SW2 Peak Current Limit (Note 3) 3.2 4.0 5.3 A SW2 Leakage Current 0.1 1 μA SW2 Top On-Resistance ISW2 = 1A 150 mΩ SW2 Bottom On-Resistance ISW2 = 1A 100 mΩ Lower FB2 Power Good Threshold Percentage of VFB2, VFB2 Falling l 89 92 95 % Upper FB2 Power Good Threshold Percentage of VFB2, VFB2 Rising l 104 107 110 % Power Good Threshold Hysteresis 0.8 % PG2 Output Voltage Low IPG2 = 350μA l 0.13 0.3 V PG2 Leakage Current PG2 = 5V, FB2 = 1V l 6 μA TRKSS2 Pull-Up Current TRKSS2 = 0.2V 1.5 2.4 3.1 μA Channel 3 PVIN3 Operating Voltage PVIN3 Falling l 2.6 5.5 V PVIN3 Undervoltage Lockout PVIN3 Falling l 2.35 2.6 V Feedback Voltage FB3 E-, I-Grade l 788 800 812 mV J-Grade l 784 800 812 mV FB3 Line Regulation VIN = 3V to 42V 0.002 0.01 %/V Input Current FB3 l –100 100 nA SW3 Leakage Current 0.1 1 μA SW3 Peak Current Limit (Note 3) 2.6 3.2 3.8 A SW3 PMOS On-Resistance ISW3 = 1A 150 mΩ SW3 NMOS On-Resistance ISW3 = 1A 100 mΩ Lower FB3 Power Good Threshold Percentage of VFB3, VFB3 Falling l 89 92 95 % Upper FB3 Power Good Threshold Percentage of VFB3, VFB3 Rising l 104 107 110 % Power Good Threshold Hysteresis 0.2 % PG3 Output Voltage Low IPG3 = 350μA l 0.13 0.3 V PG3 Leakage Current PG3 = 5V, FB3 = 0.8V l 6 μA RUN3 Threshold Voltage l 1.15 1.20 1.25 V RUN3 Input Current –100 100 nA Soft-Start Time 0.7 1 1.3 ms Rev. B 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information System Architecture Boost Controller Buck Regulators General Functions PCB Layout Thermal Considerations Typical Applications Package Description Revision History Related Parts
