LT3587 ABSOLUTE MAXIMUM RATINGSPIN CONFIGURATION(Note 1) V TOP VIEW IN ..6V Soft-Start Input Pins FB3 IN V I FB3 EN/SS3 V EN/SS1 EN/SS1, EN/SS3 ...6V 20 19 18 17 16 Feedback Pins VOUT3 1 15 FB1 2 14 V FB1, FB2, I CAP3 OUT1 FB3, VFB3 ... –0.2V to 6V SW3 3 21 13 CAP1 High Voltage Switch Pins GND 4 12 GND SW1, SW2, SW3 ...40V FLT 5 11 SW1 High Voltage Output Pins 6 7 8 9 10 CAP1, CAP3, V NC OUT1, VOUT3 ...32V FB2 GND GND SW2 Bidirectional I/O Pin UD PACKAGE FLT 20-LEAD (3mm s 3mm) PLASTIC QFN ..6V θJA = 68°C/W, θJC = 4.2°C/W FLT Current ..10mA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB Operating Junction Temperature Range .. –40°C to 125°C Storage Temperature Range ... –65°C to 125°C ORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKINGPACKAGE DESCRIPTIONTEMPERATURE RANGE LT3587EUD#PBF LT3587EUD#TRPBF LDNC 20-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICSThe l denotes the specifi cations which apply over the full operatingtemperature range, otherwise specifi cations are at TA = 25°C. VVIN = 3.6V, VEN/SS1 = VEN/SS3 = VVIN unless otherwise noted (Note 2, 3).PARAMETERCONDITIONSMINTYPMAXUNITS Operating Input Voltage Range 2.5 6 V Quiescent Current VEN/SS1 = 0V, VEN/SS3 = VVIN OR 2.4 4 mA VEN/SS1 = VVIN, VEN/SS3 = 0V OR VEN/SS1 = VEN/SS3 = VVIN Not Switching VEN/SS1 = VEN/SS3 = 0V, In Shutdown 5.5 9 μA Switching Frequency l 0.8 1 1.2 MHz Maximum Duty Cycle l 87 93 % Minimum On Time 50 70 ns Power Fault Delay from Any Output to FLT 16 ms FLT Input Threshold Low l 0.4 1.0 1.6 V FLT Leakage Current VFLT = 5V l ±1 μA FLT Voltage Output Low IFLT = 1mA l 0.4 V 3587fc 2