Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC2970
Edited by the Electronicstalk Editorial
Team on 03 April 2006
Controller assures high-availability
supplies
The LTC2970 is a dual I2C power supply monitor and margining controller designed for digital management of power supplies in high-availability systems.
Linear Technology has introduced the LTC2970, a dual I2C power supply monitor and margining controller designed for digital management of power supplies in high-availability systems The LTC2970 offers the best melding of digital and analogue for digital power management
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The I2C digital interface, 14bit ADC, highly accurate reference and current output DACs give digital power supply designers what they want: digital control of an analogue power supply.
The LTC2970 works with most any power supply, allowing designers to choose the optimal DC/DC convertor with an analogue control loop that provides smooth control of the output voltage and fast transient response.
An on-chip reference and 14bit delta-sigma A/D convertor ensure accurate measurements of supply voltages, load currents or temperature.
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Two voltage-buffered 8bit DACs drive the supplies' feedback nodes for improved accuracy or can be programmed by a slow, linear voltage servo to trim and margin the output voltages.
This makes the LTC2970 useful in determining the sensitivity of the power supply during the prototype phase or in production to test for manufacturing variations.
The superior accuracy of the IC allows it to precisely servo each supply's output voltage over a wide range of operating conditions, while integrating all the vital functions in a compact 4 x 5mm QFN package.
Extensive, user-configurable fault monitoring provides increased reliability by alerting a system's host to incipient failures before they occur.
The LTC2970's delta-sigma; architecture was specifically chosen to average out power supply noise and allow the LTC2970 to ignore fast transients.
The point of load ground reference for the DAC outputs minimises errors that would otherwise occur in a power system that experiences ground bounce.
By selecting two resistor values, the user can choose the appropriate resolution, providing an important hardware range limit beyond which the supply may not be driven.
The intelligent digital power management of the LTC2970 is ideal for controlling and monitoring DC/DC convertors, as well as for supply telemetry and various board diagnostics.
All communication with the LTC2970 is performed over the industry standard I2C bus.
It supports basic digital power commands such as setting the precise output voltage, readback of the output voltage, readback of the output current, margin up and margin down but also allows setting limits for over-/undervoltage and over-/undercurrent.
The LTC2970-1 incorporates a tracking feature that can turn on or off multiple power supplies in a controlled manner.
Specified over the commercial and industrial operating temperature ranges, pricing for the LTC2970/LTC2970-1 starts at $3.99 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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