Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX16050 and MAX16051
Edited by the Electronicstalk Editorial
Team on 05 February 2008
Supervisors sequence up to five power
supplies
The main applications for the MAX16050 and MAX16051 are servers/storage, networking and telecomms systems, where high reliability is paramount.
New from Maxim Integrated Products, the MAX16050 and MAX16051 drop-in power-supply supervisors let designers safely power up and power down their system(s) without the need for programming and/or elaborate board modifications The devices sequence up and sequence down as many as five power supplies, while also monitoring undervoltage and overvoltage conditions
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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With the additional capability of reverse sequencing, customers can now power down their system safely with no extra effort, cost, or loss of board space.
The main applications for the MAX16050 and MAX16051 are servers/storage, networking and telecomms systems, where high reliability is paramount.
Historically design solutions for sequencing and reverse sequencing were difficult and expensive to implement.
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Board layouts are typically static and space-limited.
Additionally, reverse sequencing has been difficult (if not impossible) to implement using discrete components only.
Often the architecture used to sequence up required additional components and layout to reverse sequence.
However, the MAX16050 and MAX16051 seamlessly accomplish both sequencing and reverse sequencing with no programming and no external circuitry.
The MAX16050 offers an additional benefit.
The MAX16050 device's novel sequencing engine allows the sequence order to be changed without altering the signal routing to the power supplies.
Furthermore, this configurable sequencing order is accomplished without adding bulky discrete components and/or making elaborate layout changes to the board.
The MAX16050 exchanges the 5th sequencing/monitoring channel, found in the MAX16051, for three tristate pins used to configure the sequencing order of the four remaining channels in any one of 24 possible combinations.
Users thus have full control of the sequence up/down order and can change the order on-the-fly.
The ability to use a pin-selectable sequencing order is unique to the MAX16050, and the importance of this flexibility cannot be underestimated.
In striking contrast to the industry's previous work-around, customers now keep the same board layout when startup requirements change.
The savings in development time and production costs are significant.
The MAX16050 and MAX16051's 85mA pull-down circuitry enables a fast discharge of output capacitance.
Furthermore, integrated comparators ensure that the supply voltages are below 250mV before powering down the next channel in the reverse sequence, regardless of how fast the system power is cycled.
This pull-down circuitry increases reliability in complex systems.
External resistor-divider networks set the 1.5% accurate undervoltage and overvoltage thresholds.
In the event of an overvoltage condition, an independent output signals the system controller.
This additional control protects the system, reduces damage to expensive system components, and ultimately reduces repair costs.
Users can configure the devices' outputs either to: enable point-of-load DC/DC convertors; or fully enhance the gate of series-pass FETs.
An integrated charge pump enables this flexibility.
The charge pump functions as a pull-up voltage for FETs, otherwise the open-drain outputs are pulled up to the supply voltage for enabling DC/DC convertors.
Consequently, users have the versatility of operating with mixed mode by driving both DC/DC convertors and series-pass FET simultaneously in their system.
Multiple MAX16050 and MAX16051's can be daisychained to sequence and reverse sequence across multiple devices.
This scalability requires no programming and is easy to implement.
The MAX16050 and MAX16051 have wide 2.7 to 13.2V operating voltage ranges, which allows operation directly from an intermediate bus voltage.
The devices are fully specified over the -40 to +85C extended temperature range.
The MAX16050 and MAX16051 are sampling now in small 28-pin 4 x 4mm QFN packages.
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