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MAX6458UKD-T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6458UKD-T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page MAX6457–MAX6460 High-Voltage, Low-Current Voltage Monitors in SOT Packages 9 Maxim Integrated Hysteresis Hysteresis adds noise immunity to the voltage monitors and prevents oscillation due to repeated triggering when VIN is near the threshold trip voltage. The hystere- sis in a comparator creates two trip points: one for the rising input voltage (VTH+) and one for the falling input voltage (VTH-). These thresholds are shown in Figure 6. The internal hysteresis options of the MAX6457/ MAX6458/MAX6459 are designed to eliminate the need for adding an external hysteresis circuit. Timeout Period The timeout period (tTP) for the MAX6457 is the time from when the input (IN+) crosses the rising input threshold (VTH+) to when the output goes high (see Figures 6 and 7). For the MAX6458, the monitored volt- age must be in the “window” before the timeout starts. The MAX6459 and MAX6460 do not offer the extended timeout option (150ms). The extended timeout period is suitable for overvoltage protection applications requir- ing transient immunity to avoid false output assertion due to noise spikes. Latched-Output Operation The MAX6457 features a digital latch input (CLEAR) to latch any overvoltage event. If the voltage on IN+ (VIN+) is below the internal threshold (VTH-), or if VCC is below 4V, OUT remains low regardless of the state of CLEAR. Drive CLEAR high to latch OUT high when VIN+ exceeds VTH+. When CLEAR is high, OUT does not deassert if VIN+ drops back below VIN-. Toggle CLEAR to deassert OUT. Drive CLEAR low to make the latch transparent (Figure 7). CLEAR must be low when powering up the MAX6457. To initiate self-clear at power-up, add a 100k Ω pullup resistor from CLEAR to VCC and a 1µF capacitor from CLEAR to GND to hold CLEAR low. Connect CLEAR to GND when not used. See Figure 9. IN+ OUT >VTH+ <VTH- VCC VCC 0 0 tTP tTP tTP CLEAR Figure 7. Timing Diagram (MAX6457) 5-CELL Li+ BATTERY STACK BATTERY CHARGER DC-DC CONVERTER LOAD R1 R2 RPULLUP IN OUT +21V VCC GND IN+ OUT (OUTA FOR MAX6459) MAX6457– MAX6460 SHDN Figure 8. Undervoltage Lockout Typical Application Circuit |
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