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MAX16014TT-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX16014TT-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Detailed Description The MAX16010–MAX16014 is a family of ultra-small, low- power, overvoltage protection circuits for high-voltage, high-transient systems such as those found in automo- tive, telecom, and industrial applications. These devices operate over a wide 5.5V to 72V supply voltage range, making them also suitable for other applications such as battery stacks, notebook computers, and servers. The MAX16010 and MAX16011 offer two independent comparators for monitoring both undervoltage and overvoltage conditions. These comparators offer open- drain outputs capable of handling voltages up to 72V. The MAX16010 features complementary enable inputs (EN/EN), while the MAX16011 features an active-high enable input and a selectable active-high/low OUTB output. The MAX16012 offers a single comparator and an inde- pendent reference output. The reference output can be directly connected to either the inverting or noninvert- ing input to select the comparator output logic. The MAX16013 and MAX16014 are overvoltage protec- tion circuits that are capable of driving two p-channel MOSFETs to prevent reverse battery and overvoltage conditions. One MOSFET (P1) eliminates the need for external diodes, thus minimizing the input voltage drop. While the second MOSFET (P2) isolates the load or reg- ulates the output voltage during an overvoltage condi- tion. The MAX16014 keeps the MOSFET (P2) latched off until the input power is cycled. Voltage Monitoring The MAX16010/MAX16011 include undervoltage and overvoltage comparators for window detection (see Figure 1). OUT_ asserts high when the monitored volt- age is within the selected “window.” OUTB asserts low when the monitored voltage falls below the lower (VTRIPLOW) limit of the window, or OUTA asserts low if the monitored voltage exceeds the upper limit (VTRIPHIGH). The application in Figure 1 shows OUT_ enabling the DC-DC converter when the monitored volt- age is in the selected window. The resistor values R1, R2, and R3 can be calculated as follows: 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 MAX16010/MAX16011 have very high input impedance, RTOTAL can be up to 5M Ω. 2) Calculate R3 based on RTOTAL and the desired upper trip point: 3) Calculate R2 based on RTOTAL, R3, and the desired lower trip point: 4) Calculate R1 based on RTOTAL, R3, and R2: R1 = RTOTAL - R2 - R3 The MAX16012 has both inputs of the comparator avail- able with an integrated 1.30V reference (REF). When the voltage at IN+ is greater than the voltage at IN- then OUT goes high. When the voltage at IN- is greater than the voltage at IN+ then OUT goes low. Connect REF to IN+ or IN- to set the reference voltage value. Use an external resistive divider to set the monitored voltage threshold. R VR V R TH TOTAL TRIPLOW 23 = × − − R VR V TH TOTAL TRIPHIGH 3 = × + VV R R TRIPHIGH TH TOTAL = ⎛ ⎝⎜ ⎞ ⎠⎟ + 3 VV R RR TRIPLOW TH TOTAL = + ⎛ ⎝⎜ ⎞ ⎠⎟ − 23 Ultra-Small, Overvoltage Protection/ Detection Circuits 6 _______________________________________________________________________________________ MAX16010 DC-DC REGULATOR IN EN INA+ INB- OUTB OUTA R3 R2 R1 +48V EN GND VCC EN Figure 1. MAX16010 Monitor Circuit |
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