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MAX16955 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX16955 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 26 page 36V, 1MHz Step-Down Controller with Low Operating Current _______________________________________________________________________________________ 3 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FB Line Regulation VEN = VSUP, 6V < VSUP < 36V (Note 4) 0.02 %/V Transconductance (from FB to COMP) gm,EA 1200 μS Error-Amplifier Output Impedance ROUT,EA 30 M RFOSC = 76.8k 360 400 440 Operating Frequency fSW RFOSC = 30.1k 1000 kHz Minimum On-Time tON(MIN) 80 ns Maximum FSYNC Frequency fFSYNC(MAX) 1100 kHz Minimum FSYNC Frequency fFSYNC(MIN) fFSYNC > 110% of internal frequency (20% duty cycle), fSW = 220kHz 242 kHz FSYNC Switching Threshold High VFSYNC,HI 1.4 V FSYNC Switching Threshold Low VFSYNC,LO 0.4 V FSYNC Internal Pulldown Resistance 1 M CURRENT LIMIT CS Input Current ICS VCS = VOUT = 0V or VBIAS (Note 4) -1 +1 μA During normal operation 22 Output Input Current IOUT VFB = VBIAS 32 μA CS Current-Limit Voltage Threshold VLIMIT VCS - VOUT, VBIAS = 5V, VOUT 2.5V 68 80 92 mV FAULT DETECTION Output Overvoltage Trip Threshold VFB,OV VOUT = VFB, rising edge 108 113 118 %VFB Output Overvoltage Trip Hysteresis 2.5 % Rising edge 25 Output Overvoltage Fault Propagation Delay tOVP Falling edge 25 μs Output Undervoltage Trip Threshold VFB,UV VOUT = VFB; with respect to slewed FB threshold, falling edge 83 88 93 %VFB Output Undervoltage Trip Hysteresis 2.5 % Falling edge 25 Output Undervoltage Propagation Delay Rising edge (excluding startup) 25 μs PGOOD Output Low Voltage VPGOOD,L ISINK = 3mA 0.4 V PGOOD Leakage Current IPGOOD 1 μA Thermal Shutdown Threshold TSHDN (Note 5) +175 °C Thermal Shutdown Hysteresis (Note 5) 15 °C ELECTRICAL CHARACTERISTICS (continued) (VSUP = VEN = 14V, CIN = 10μF, COUT = 94μF, CBIAS = 2.2μF, CBST = 0.1μF, RFOSC = 76.8k Ω, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) |
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