Microchip Provides Digital Control for Analog Power-Supply Function

9/9/2004 - Microchip Technology Inc., a leading provider of microcontroller and analog semiconductors, announced a power supply-pulse width modulation (PWM) controller with a current sense-to-output delay of 12 nanoseconds making this device the fastest PWM on the market*. This device enables power-system designers to add precision control, digital communication and programmability for initial settings or an “on-the-fly” adjustment or calibration.

Microchip’s MCP1630 is comprised of a high-speed comparator with a high-performance error amplifier and a PWM latch to perform the analog power-supply PWM function. This device, when used in conjunction with a microcontroller, can support the development of high-speed, intelligent, power-system controllers. The microcontroller adjusts the output voltage (or current), switching frequency, maximum duty cycle and other features making the power system more intelligent and adaptable. This enables the power system to adapt to many external signals and variables in order to optimize performance and facilitate calibration.

The MCP1630 can yield a power supply with advanced features, communications and programmability, and it supports all Switchmode Power Supply (SMPS) topologies. It is best suited for applications requiring medium-to-high levels of intelligence and operating at frequencies exceeding 200 kHz. Typical applications include battery chargers for Lithium-Ion and Nickel Metal Hydride chemistries, intelligent power systems, brick DC/DC converters, AC power-factor correction, multiple output-power supplies and multiple-phase power supplies.

This PWM device has internal protection, including under-voltage lockout (UVLO), output short circuit and over-temperature protection. It has a low operating current of 2.8 milliamps (typical) and fast output rise and fall times of 5.9 nanoseconds and 6.2 nanoseconds, respectively. In addition, this device has a precise peak-current limit of +/- 5 percent and a peak-current mode operation to 1 MHz.

To aid in the development with this device, Microchip is offering a battery-charger demonstration board. On this board is a SEPIC (Single End Primary Inductor Circuit) converter that provides a constant charge current to the battery. The MCP1630 regulates this charge current by monitoring it through a battery-sense resistor and by providing the proper pulse width. Additional features, including trickle charge, fast charge, over-voltage protection, can be added to the system using the programmability of the microcontroller and the flexibility of the MCP1630.

Available in 8-pin MSOP package, this device is priced at $0.98 in 1,000-unit quantities. Samples and volume production are available now. For more information, contact any Microchip sales representative, authorized Microchip distributor around the world or visit www.microchip.com/mcp1630

Microchip Technology Inc. (NASDAQ: MCHP) is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Ariz., Microchip offers outstanding technical support along with dependable delivery and quality. For more information, visit the Microchip Web site at www.microchip.com.

The Microchip name and logo are registered trademarks of Microchip Technology Inc. in the USA and other countries.

* Based on a study of devices with similar features.

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