MAX25601A/MAX25601B/ Synchronous Boost and MAX25601C/MAX25601D Synchronous Buck LED Controllers Electrical Characteristics (continued) (VIN = 12V, VUVEN = 12V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSBUCK / ON-TIME CONTROL/OVERVOLTAGE PROTECTION/SHORT FAULT INDICATOR Minimum On-Time tON_MIN_BUCK 110 ns Maximum On-Time tON_MAX_BUCK TON = GND, VOUT = 1V 24 μs tON Pulldown Resistance VIN = 65V, RTON > 20kΩ 15 30 Ω tONThreshold to DH Falling Delay tON_DLY_BUCK 65 ns OUT Overvoltage VTH_OVP_ Threshold OUT rising 2.38 2.5 2.62 V BUCK OUT Overvoltage Hysteresis OUT falling 20 mV Short Fault Threshold OUTV_SHF Output falling, VOUT is lower than threshold 50 mV Programmed On-Time VOUT_BUCK = 1V, RTON = 50kΩ, CTON = 1nF 4.55 μs BUCK / ANALOG DIMMING INPUT REFI Input Voltage Range VREFI_RNG 0.2 1.2 V REFI Zero Current Threshold VREFI_ZC VCSP - VCSN < 5mV 0.16 0.18 0.20 V Internal REFI Clamp Voltage VREFI_CLMP IREFI sink = 1μA 1.254 1.3 1.326 V REFI Input Bias Current IREFI VREFI = 0 to VCC 20 200 nA BUCK / BUCK FAULTS LED Open-Fault Enable VREFI greater than this threshold, 50mV (typ) Threshold LOFREFI_VTH hysteresis 300 325 350 mV LED Open-Fault VIOUTV lower than the threshold when DIM is Detection Threshold LOFIOUTV_TH high 10 25 40 % BUCK / CURRENT-SENSE AMPLIFIER Buck Current-Sense Gain CSABUCK 5 V/V Buck Current-Sense VCS_OFS_ Amplifier Offset 0.182 0.2 0.208 V BUCK BUCK / PWM AND ANALOG-TO-PWM DIMMING DIM Input High VDIM_IH DIM Rising 2.0 V DIM Input Low VDIM_IL DIM Falling 0.8 V DIM Rising to DL2 Rising Delay tDIM_RIS DIM Rising 100 ns External DIM Frequency Range fDIM_EXT 10 2000 Hz Internal Ramp Frequency fDIM_INT 180 200 220 Hz DIM Comparator Offset Voltage VDIM_OFS 170 200 230 mV DIM Voltage for 100% Duty Cycle 3.2 V www.maximintegrated.com Maxim Integrated │
