MAX709SCPA+

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	2.93V
Operating Temperature:	0°C ~ 70°C (TA)
Mounting Type:	Through Hole
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-PDIP
Base Part Number:	MAX709

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Introduction

The MAX709SCPA+ is a low-battery/power supply supervisor IC from Maxim Integrated, a leader in the PMIC and semiconductor market. It monitors power supplies and batteries for overvoltage, undervoltage, and brownout conditions. Features include hysteresis, diagnostics, and various reset functions such as an adjustable undervoltage lockout and active-low reset. The device comes in an 8-pin DIP, an 8-pin SOIC, and a 5-pin SOT-23 package, making it wide-suitable for any design.

Application Fields

The MAX709SCPA+ is a versatile power supervisor IC and has a range of applications. In general, it can be used to monitor any power supply or battery, including those in PCs, smart phones, digital cameras, household appliances, security systems, automotive electronics, and industrial or medical equipment. For PCs, it could monitor the standby power supply and CPU core voltage, checking for overvoltage, undervoltage, or brownout issues. It has adjustable thresholds that can be set to detect a minimum acceptable voltage, and if that voltage is lower than expected, the device can trigger a power-on reset for the PC. Similarly, it has applications within sophisticated security systems. It can monitor an alarm-verification power source and take preventive measures if it predicts an issue with detecting voltage drop out or low voltage conditions. Not only can it detect adverse voltage conditions and trigger system reset, but it also provides a diagnostic indication when the detector deactivates.In the field of automotive electronics, the MAX709SCPA+ can be used for battery monitor and control, power management in electronic systems, overvoltage protection of integrated circuits and batteries, in-rush current limit, and power-on reset. What’s more, the MAX709SCPA+ could also take an important role in industrial and medical equipment. It can provide power supply monitoring, reset control and other power quality monitoring requirements.

Working Principle

Typical working of the MAX709SCPA+ is as follows: it monitors an input voltage on pin VCC or VBAT, compares this voltage to two predetermined levels: NVI (nominal) and PVI (programmable voltage detect) limits. In standby mode, VCC is compared against NVI setting. If it falls below NVI, a reset output is triggered and the reset is held low until VCC rises back above NVI. In conditional reset mode, the MAX709SCPA+ continuously monitors VCC to ensure VCC does stay above PVI, and will reset the system if VCC drops below the PVI limit. This reset is held until the input voltage rises above the RESET hold voltage limit (EVI). Besides these two modes, the MAX709SCPA+ can enter active-high or active-low reset modes by connecting the reset pin to ground. Moreover, the MAX709SCPA+ is equipped with hysteresis which ensures false triggering is avoided during transients. Hysteresis is the difference between the PVI and NVI thresholds, where NVI > PVI. When Hysteresis is enabled via Equation 1, NVI increases by Hysteresis (HYS) offset by a preset (HYS1) and PVI decreases by HYS offset by a preset (HYS2). Finally, the MAX709SCPA+ also has diagnostic reporting which can indicate the status of the power source. Diagnostic code is transmitted on pin DIAG, where pin DIAG is driven high if the voltage on pin VCC falls below Nominal Voltage Level (NVI), and low if the voltage on pin VCC is above PVI + Hysteresis (HYS 2).

Conclusion

In conclusion, the MAX709SCPA+ is a simple, yet effective IC with wide-ranging applications in the fields of personal computing, security systems, automotive electronics, industrial and medical equipment. It monitors the input voltage and triggers system reset if the voltage falls below certain limits, ensuring a stable power supply. Features such as hysteresis, diagnostics, active-high/low reset modes, and adjustable threshold limits makes the MAX709SCPA+ a versatile device for any design.

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