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Power tracking/sequencing controller supports 3 power modules

Posted: 23 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LTC2926? power supply tracking? sequencing controller?

The new power supply tracking and sequencing controller from Linear Technology Corp. is designed for use with modules or power supplies with or without access to feedback pins. The LTC2926 enables a variety of power up and power down profiles and supports up to three power modules: two "slave" supplies that track a "master" signal. Tracking of up to two DC/DC modules is achieved with N-channel MOSFETs in series with the power path, and for IC-based converters, by injecting currents into their feedback nodes without affecting their stability or the transient response. In addition to the MOSFETs, two external resistors per channel configure the load voltages to track together with voltage offsets, time delays or different ramp rates. According to Linear Tech, this variety of power up and power down profiles satisfies the requirements of digital logic circuits, such as FPGAs, PLDs, DSPs and microprocessors, making the LTC2926 ideal for such applications.

The LTC2926 features two integrated remote sense switches that automatically compensate for the voltage drop across the MOSFETs. For applications that require more than two remote sense switches, an additional gate drive can be used to control an external remote sense MOSFET. In addition, a Power Good timer sets the time allowed for a power supply to turn on after it has been enabled and will assert a Fault should a supply fail to enter regulation within the allotted time interval. The status output asserts after tracking and sequencing have completed.

Specified over both the commercial and industrial temperature ranges, the LTC2926 is offered in 20-lead SSOP and 4-by-5mm QFN packages. Pricing starts at $3.50 each for 1,000-piece quantities.




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Related Datasheets
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? LTC2926 MOSFET-Controlled Power Supply Tracker ICs, Interface

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