MAX691ACWE+

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Battery Backup Circuit
Number of Voltages Monitored:	1
Output:	Push-Pull, Push-Pull
Reset:	Active High/Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	4.65V
Operating Temperature:	0°C ~ 70°C (TA)
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	MAX691

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MAX691ACWE+ Application Field and Working Principle

MAX691ACWE+ can be classified as PMIC - Supervisors. It is a highly integrated supervisor offering easy customization and optimized power-up/down sequencing. It can detect up to three supply voltages and control power up/down sequencing with up to 2 open drain outputs.The part is suitable for the application in desktops and servers, where short-term sufficiency of power rails is required to prevent powering up of circuits with insufficient power.This part is able to detect the presence of power supply voltages as low as under-voltage to prevent improper operation caused by low voltage. It provides an output signal to activate or deactivate other devices responsible for safe shutting down of the system if power goes below the specified level. This part works as a protection against system instability due to low relevant input power.For devices that require power ups and down sequenced according to PMIC\'s specifications, the MAX691ACWE+ is suitable. MAX691ACWE+ can be customized with respect to power up and down timing and keep devices away from the dangerous state of powering up with insufficient power. Its synchronization ability also allows easy implementation of logic level shifting or voltage conversions between logic sections. The part has four pins, an output pin connected to sinking elements, a non-inverting input pin and an inverting input pin. Also available is a reset output which may be used to drive a reset circuit in the system.The MAX691ACWE+ has its power supplies connected to its input pins, and the sinking elements are connected to its output pin. It monitors the presence of the power supply voltages and generates an output signal to notify of its presence or absence. The non-inverting input and inverting input pins act as inputs for under-voltage and over-voltage detection. When either of the inputs reaches an established voltage threshold, an output signal is generated to actuate a circuit which is responsible for safe powering down of the device. The reset output will be activated whenever demand from the microcontroller is received. The reset output is an external reset signal designed to reset the initialization of the devices whenever necessary. The reset pin will inform the microcontroller that devices need to be powered down and reset.The MAX691ACWE+ can be easily configured with logic tricks for over-voltage and under-voltage set points. This provides a voltage range to track and reset the device if supply voltage gets out of nominal range. The versatile device also has a configurable delay timer to control power up time. This prevents the device from powering up with minimal or insufficient power.MAX691ACWE+\'s advantages come with higher reliability, better power supply sequencing, and fast reaction time. This device is a must-have in servers, where power-on and power-off protocols should be highly managed and regulated.In conclusion, the MAX69ACWE+ is a PMIC —Supervisor that is suitable for a variety of applications. Its features of detecting power supply voltages and signalling for safe power up/down sequencing, provide high reliability and faster reaction times. With its optimization of power up and power down sequencing, the device is necessary for servers which must carefully and accurately manage power sequences.

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