LTC3860 ELECTRICAL CHARACTERISTICSThe l denotes the specifi cations which apply over the full operatingjunction temperature range, otherwise specifi cations are at TA = 25°C (Note 3). VCC = 5V, VRUN1,2 = 5V, VFREQ = VCLKIN = 0V, VFB = 0.6V,fOSC = 0.6MHz unless otherwise specifi ed. SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS ISS Soft-Start Pin Output Current VSS = 0V 2.5 μA tSS(INTERNAL) Internal Soft-Start Time 2 ms VFB Regulated Feedback Voltage 0°C to 85°C 595.5 600 604.5 mV –40°C to 85°C 594 600 606 mV –40°C to 125°C l 592.5 600 607.5 mV ΔVFB/ΔVCC Regulated Feedback Voltage Line 3.0V < VCC < 5.5V 0.05 0.2 %/V Dependence ILIMIT ILIM Pin Output Current VILIM = 0.8V 18 20 22 μA Power Good VFB(OV) PGOOD/VFB Overvoltage Threshold VFB Falling 645 mV VFB Rising 650 660 670 mV VFB(UV) PGOOD/VFB Undervoltage Threshold VFB Falling 530 540 550 mV VFB Rising 555 mV VPGOOD(ON) PGOOD Pull-Down Resistance 15 60 Ω Error Amplifi er IFB FB Pin Input Current VFB = 600mV –100 100 nA IOUT COMP Pin Output Current Sourcing 1 mA Sinking 5 mA AV(OL) Open-Loop Voltage Gain 75 dB SR Slew Rate 45 V/μs f0dB COMP Unity-Gain Bandwidth 20 MHz Differential Amplifi er AV Differential Amplifi er Voltage Gain VVSNSN = 0V l 1.007 1 0.993 V/V VOS Input Referred Offset VVSNSN = 0V –2 2 mV SR Slew Rate 45 V/μs f0dB Bandwidth 20 MHz VOUT(MAX) Maximum Output Voltage 4 V Current Sense Amplifi er VISENSE(MAX) Maximum Differential Current Sense 50 mV Voltage (VISNSP-VISNSN) AV(ISENSE) Voltage Gain 18.5 V/V VCM(ISENSE) Input Common Mode Range –0.3 VCC + 0.1 V IISENSE SENSE Pin Input Current VCM = 1.5V 100 nA VOS Current Sense Input Referred Offset 0°C to 125°C –2 2 mV –40°C to 125°C l –2.2 2.2 mV Oscillator and Phase-Locked Loop fOSC Oscillator Frequency VCLKIN = 0V VFREQ = 0V l 360 400 440 kHz VFREQ = 5V l 540 600 660 kHz VCLKIN = 5V RFREQ < 24.9k 200 kHz RFREQ = 30.1k 300 kHz RFREQ = 54.9k 800 kHz RFREQ = 75.0k 1.2 MHz Maximum Frequency 1.25 MHz Minimum Frequency 0.25 MHz 3860fc 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
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