MAX34440ETLA1+

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MAX34440ETLA1+ is an advanced general-purpose, voltage monitor IC designed for system power supply protection and monitoring, which belongs to PMIC - Power Supply Controllers, Monitors.

The primary application field of the MAX34440ETLA1+ is to monitor the voltage rail, protecting the system and the peripherals against over-voltage and under-voltage conditions. By providing a precise and low-cost solution to detect abnormal conditions in an electronic system, a system designer can secure their design and protect against potential damage.

MAX34440ETLA1+ integrates two OV/UV comparators, with active-low output. The monitored voltage is compared to two programmable OV/UV thresholds and when either threshold is exceeded, the output latch is set, and an active-low output pulse is issued. The MAX34440ETLA1+ can be programmed to operate with two independent thresholds or one threshold, which makes it flexible to use in different applications.

The MAX34440ETLA1+ operates over a wide supply voltage range from 2.7 V to 5.5 V (VCC); and its input voltage, VIN, is monitored in the range of 1.6 V to 6.2 V. In addition, this device has a high input impedance of 150 kΩ, allowing it to monitor high impedance nodes accurately.

The MAX34440ETLA1+ provides a wide tolerance of programmable thresholds, which is adjustable between +31 mV to +683 mV, measured relative to the device power supply. This wide range of threshold voltage enables a wide variety of applications.

The MAX34440ETLA1+ features an integrated low-dropout (LDO) regulator with output voltage selection that ranges from 1.5 V to 3.3 V. This LDO provides a clean supply voltage for the internal ASIC, aiding accurate operation and enabling a simple single-supply system.

The MAX34440ETLA1+ provides an adjustable Time-out pulse width with a factory-set value of 8 ms. This pulse is generated when either the overvoltage or the undervoltage conditions occur. The Time-Out pulse width value is adjustable from 1 μs to 65 ms. This feature allows the system design to add an external timer of the appropriate interval—independent of the monitored voltage’s rise and fall times—that enables additional flexibility.

The MAX34440ETLA1+ is driven by a single-wire serial peripheral interface (SPI). The serial input controls the Programming Register via 10 bits and provides access to an array of digital configuration bits, allowing flexibility for programming various OV and UV thresholds.

In addition, the MAX34440ETLA1+ provides an active-low output pulse when each OV/UV threshold is exceeded. It also has several power saving features, including a disable pin that can be used to suspend the detection circuit, allowing the system to consume less power when the rail is not being monitored.

The MAX34440ETLA1+ has integrated glitch and spike filters, which minimizes false trips due to power system transients and improves the immunity of the device against the common-mode noise.

The MAX34440ETLA1+ is available in a 10-pin, 4 mm × 4 mm VQFN package. This low-profile package, in conjunction with its low power consumption, makes the MAX34440ETLA1+ suitable for space-constrained applications such as smart phones, tablets, digital cameras, drones, and many other portable devices.

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