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LTC1736IG Datasheet(PDF) 2 Page - Linear Technology |
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LTC1736IG Datasheet(HTML) 2 Page - Linear Technology |
2 / 28 page 2 LTC1736 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) Input Supply Voltage (VIN).........................36V to –0.3V Topside Driver Supply Voltage (BOOST)....42V to – 0.3V Switch Voltage (SW) ....................................36V to – 5V EXTVCC, VIDVCC, (BOOST – SW) Voltages ..7V to –0.3V SENSE+, SENSE–.......................... 1.1(INTVCC) to –0.3V FCB Voltage ............................(INTVCC + 0.3V) to –0.3V ITH, VOSENSE, VFB Voltage .........................2.7V to –0.3V RUN/SS, VID0 to VID4, PGOOD Voltages ....7V to – 0.3V Peak Driver Output Current <10 µs (TG, BG) .............. 3A INTVCC Output Current ......................................... 50mA Operating Ambient Temperature Range LTC1736C ............................................... 0 °C to 85°C LTC1736I ............................................ – 40 °C to 85°C Junction Temperature (Note 2) ............................. 125 °C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER Consult factory for Military grade parts. TJMAX = 125°C, θJA = 110°C/W 1 2 3 4 5 6 7 8 9 10 11 12 TOP VIEW G PACKAGE 24-LEAD PLASTIC SSOP 24 23 22 21 20 19 18 17 16 15 14 13 COSC RUN/SS ITH FCB SGND PGOOD SENSE – SENSE + VFB VOSENSE VID0 VID1 TG BOOST SW VIN INTVCC BG PGND EXTVCC VIDVCC VID4 VID3 VID2 ELECTRICAL CHARACTERISTICS LTC1736CG LTC1736IG The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop VOSENSE Output Voltage Set Accuracy (Note 3) See Table 1 q 1% ∆VLINEREG Reference Voltage Line Regulation VIN = 3.6V to 30V (Note 3) 0.001 0.02 %/V ∆VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; VITH = 0.7V q 0.1 0.3 % Measured in Servo Loop; VITH = 2V q – 0.1 – 0.3 % gm Transconductance Amplifier gm 1.3 mmho VFCB Forced Continuous Threshold q 0.76 0.8 0.84 V IFCB Forced Continuous Current VFCB = 0.85V – 0.17 – 0.3 µA VOVL Feedback Overvoltage Lockout q 0.84 0.86 0.88 V IQ Input DC Supply Current (Note 4) Normal Mode 450 µA Shutdown VRUN/SS = 0V 15 25 µA VRUN/SS Run Pin Start Threshold VRUN/SS, Ramping Positive 1.0 1.5 1.9 V VRUN/SS Run Pin Begin Latchoff Threshold VRUN/SS, Ramping Positive 4.1 4.5 V IRUN/SS Soft-Start Charge Current VRUN/SS = 0V – 0.7 – 1.2 µA ISCL RUN/SS Discharge Current Soft Short Condition, VFB = 0.5V, 0.5 2 4 µA VRUN/SS = 4.5V UVLO Undervoltage Lockout Measured at VIN Pin (VIN Ramping Down) q 3.5 3.9 V ∆VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V q 60 75 85 mV ISENSE SENSE Pins Total Source Current VSENSE– = VSENSE+ = 0.8V 60 80 µA tON(MIN) Minimum On-Time Tested with a Square Wave (Note 8) 160 200 ns TG Transition Time: (Note 9) TG tr Rise Time CLOAD = 3300pF 50 90 ns TG tf Fall Time CLOAD = 3300pF 50 90 ns |
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