Datasheet LTM4651 (Analog Devices) - 4

LTM4651
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range (Note 2). T – A = 25
°
C, Test Circuit 1, VIN = 24V and electrically connected to SVIN and RUN, ISETa – SVOUT = 24V, EXTVCC = PGND, CLKIN open circuit, RfSET = 57.6kΩ and RISET = 480kΩ and voltages referred to PGND unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I – – OUT(OCL) IOUT Output Current Limit 2.45 A
Control Section
I – ISETa Reference Current of ISETa Pin VISETa – SVOUT = 0.5V, 3.6V ≤ VIN ≤ 28V l 49.3 50 50.7 µA 0.1V ≤ V – – ISETa – SVOUT ≤ VIN – SVOUT ≤ 58V l 49 50 51 µA I – – GNDSNS GNDSNS Leakage Current VIN – SVOUT = SVIN – SVOUT = RUN – GND = 600 μA ISETa – SV – OUT = 58V tON(MIN) Minimum On-Time (Note 4 ) 60 ns VRUN RUN Turn-On/-Off Thresholds RUN Input Turn-On Threshold, RUN Rising l 1.08 1.2 1.32 V RUN Hysteresis 130 mV (RUN Thresholds Measured with Respect to GND) IRUN RUN Leakage Current VIN = 48V, RUN – GND = 3.3V l 0.1 50 nA
Oscillator and Phase-Locked Loop (PLL)
f – OSC Oscillator Frequency Accuracy VIN = 12V, ISETa – SVOUT = 5V, and: fSET Open Circuit l 360 400 440 kHz RfSET = 57.6kΩ (See fs Specification) 1.95 MHz f – SYNC PLL Synchronization Capture Range VIN = 12V, ISETa – SVOUT = 5V, CLKIN Driven with a GND-Referred Clock Toggling from 0.4V to 1.2V and Having a Clock Duty Cycle: From 10% to 90%; fSET Open Circuit 250 550 kHz From 40% to 60%; RfSET = 57.6kΩ 1.3 3 MHz VCLKIN CLKIN Input Threshold VCLKIN Rising, with Respect to GND 1.2 V VCLKIN Falling, with Respect to GND 0.4 V ICLKIN CLKIN Input Current VCLKIN = 5V with Respect to GND 230 500 μA VCLKIN = 0V with Respect to GND –20 –5 μA
Power Good Feedback Input and Power Good Output
OVPGDFB Output Overvoltage PGOOD Upper PGDFB Rising, Differential Voltage from PGDFB l 620 645 675 mV Threshold to SV – OUT UVPGDFB Output Undervoltage PGOOD Lower PGDFB Falling, Differential Voltage from l 525 555 580 mV Threshold PGDFB to SV – OUT ∆VPGDFB PGOOD Hysteresis PGDFB Returning 8 mV R – PGDFB Resistor Between PGDFB and SVOUT 4.94 4.99 5.04 kΩ R – – PGOOD PGOOD Pull-Down Resistance VPGOOD = 0.1V with Respect to GND, VPGDFB SVOUT < 700 1500 Ω UV – PGDFB or VPGDFB – SVOUT > OVPGDFB IPGOOD(LEAK) PGOOD Leakage Current VPGOOD = 3.3V with Respect to GND, UVPGDFB < 0.1 1 μA V – PGDFB – SVOUT < OVPGDFB tPGOOD(DELAY) PGOOD Delay PGOOD Low to High (Note 4) 16/fSW(HZ) s PGOOD High to Low (Note 4) 64/fSW(HZ) s Rev. A 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 Simplified Block Diagram Test Circuit Decoupling Requirements Operation Applications Information Typical Applications Package Photograph Package Description Typical Application Related Parts