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MAX6458UKD0A-T Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6458UKD0A-T Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 15 page  Detailed Description Each of the MAX6457–MAX6460 high-voltage (4V to 28V), low-power voltage monitors include a precision bandgap reference, one or two low-offset-voltage com- parators, internal threshold hysteresis, internal timeout period, and one or two high-voltage open-drain outputs. Programming the Trip Voltage (VTRIP) Two external resistors set the trip voltage, VTRIP (Figure 5). VTRIP is the point at which the applied voltage (typically VCC) toggles OUT. The MAX6457/MAX6458/MAX6459/ MAX6460’s high input impedance allows large-value resistors without compromising trip-voltage accuracy. To minimize current consumption, select a value for R2 between 10k Ω and 1MΩ, then calculate R1 as follows: where VTRIP = desired trip voltage (in volts), VTH = threshold trip voltage (VTH+ for overvoltage detection or VTH- for undervoltage detection). Use the MAX6460 voltage reference (REF) to set the trip threshold by connecting IN+ or IN- through a volt- age divider (within the inputs common-mode voltage range) to REF. Do not connect REF directly to IN+ or IN- since this violates the input common-mode voltage range. Small leakage currents into the comparators inputs allows use of large value resistors to prevent loading the reference and affecting its accuracy. Figure 5b shows an active-high power-good output. Use the following equation to determine the resistor values when connecting REF to IN-: where VREF = reference output voltage (2.25V, typ), VREFD = divided reference, VTRIP = desired trip thresh- old in (in volts). For an active-low power-good output, connect the resistor divider R1 and R2 to the inverting input and the reference-divider network to the noninverting input. Alternatively, connect an external reference less than 1.4V to either input. RR V V TRIP REFD 12 1 =− ⎛ ⎝⎜ ⎞ ⎠⎟ VV R RR REFD REF = + ⎛ ⎝⎜ ⎞ ⎠⎟ 4 34 RR V V TRIP TH 12 1 = ⎛ ⎝⎜ ⎞ ⎠⎟ - High-Voltage, Low-Current Voltage Monitors in SOT Packages 8 VCC IN+ GND OUT (OUTA FOR MAX6459) R1 VCC R2 RPULLUP OUT (OUTA) MAX6457– MAX6460 VTRIP = VTH R1 + R2 R2 Figure 5a. Programming the Trip Voltage VCC IN+ REF IN- GND R1 VTRIP VREFD R2 R3 R4 RPULLUP OUT OUT MAX6460 Figure 5b. Programming the MAX6460 Trip Voltage VTH+ VTH- VIN+ VOUT 0 VCC VHYST tTP tTP Figure 6. Input and Output Waveforms (Noninverting Input Varied) |
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