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MAX16009TG+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX16009TG+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 14 page Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN _______________________________________________________________________________________ 9 Detailed Description The MAX16008/MAX16009 are adjustable quad win- dow voltage detectors in a small thin QFN package. These devices are designed to provide a higher level of system reliability by monitoring multiple supply voltages and providing a fault signal when any of the voltages exceeds its overvoltage threshold or falls below its undervoltage threshold. These devices offer user-adjustable thresholds that allow voltages to be monitored down to 0.4V. The devices allow the upper and lower trip thresholds of each window detector to be set externally with the use of three external resistors. Each monitored threshold has an independent open- drain output for signaling a fault condition. The outputs can be wire OR’ed together to provide a single fault output. The open-drain outputs are internally pulled up with a 30µA current, but can be externally driven to other voltage levels for interfacing to other logic levels. Both devices feature a margin input to disable the out- puts during margin testing or any other time after power-up operations. The MAX16009 offers a reset out- put that deasserts after a reset timeout period after all voltages are within their threshold specification. The reset timeout is internally set to 140ms (min), but can be externally adjusted to other reset timeouts using an external capacitor. In addition, the MAX16009 offers a manual reset input. Applications Information Voltage Monitoring The MAX16008/MAX16009 feature undervoltage and overvoltage comparators for window detection (see Figure 2). UVOUT_/OVOUT_ deassert high when the monitored voltage is within the “selected window.” When the monitored voltage falls below the lower limit of the window (VTRIPLOW), UVOUT_ asserts low; or if the monitored voltage exceeds the upper limit (VTRIPHIGH), OVOUT_ asserts low. The application in Figure 2 shows the MAX16008/MAX16009 enabling the DC-DC converter when the monitored voltage is in the selected window. The resistor values R1, R2, and R3 can be calculated as shown: where RTOTAL = R1 + R2 + R3. Use the following steps to determine the values for R1, R2, and R3: 1) Choose a value for RTOTAL, the sum of R1, R2, and R3. Because the MAX16008/MAX16009 have very low input bias current (2nA typ), RTOTAL can be up to 2M Ω. Large-value resistors help minimize power consumption. Lower-value resistors can be used to maintain overall accuracy. VV R RR VV R R TRIPLOW TH TOTAL TRIPHIGH TH TOTAL = + ⎛ ⎝⎜ ⎞ ⎠⎟ = ⎛ ⎝⎜ ⎞ ⎠⎟ 23 3 VCC +5V IN GND UVIN_ OVIN_ EN OUT R1 R2 R3 DC-DC REGULATOR UVOUT_ OVOUT_ MAX16008/ MAX16009 Figure 2. MAX16008/MAX16009 Monitor Circuit |
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Similar Description - MAX16009TG+ |
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