Step-Down Buck Regulator features 8-50 V input range.

Press Release Summary:

Supplied in eSOIC-8L package, general-purpose A8498 is 3 A fixed off-time, current-mode-controlled, buck-switching regulator that operates in continuous and discontinuous modes. Off time is determined by external resistor, and internal blanking circuit filters out transients due to reverse recovery of external clamp diode. With 200 nsec blanking time and adjustable 0.8-24 V output voltage, regulator requires external clamping diode, inductor, and filter capacitor.

Original Press Release:

Allegro Announces a New Wide-Input Voltage 3 A Step-Down Regulator

A8498 General-Purpose Buck Regulator for a Wide Variety of Applications

Worcester, MA, June 12, 2006 - Allegro expands their current family of step-down regulators by adding a 3 A fixed off-time, current-mode-controlled buck-switching regulator. This general-purpose buck regulator is targeted at the consumer electronics and industrial markets. This new device can be used in a wide variety of applications; the 8 V to 50 V input range makes it ideal where a wide range of input voltages may occur.

Allegro's A8498 can handle a wide input of operating voltage ranges. The regulator requires an external clamping diode, inductor and filter capacitor, and the off time is determined by an external resistor. It will operate in both continuous and discontinuous modes. An internal blanking circuit will be used to filter out transients due to the reverse recovery of the external clamp diode. Typical blanking time is 200 nS, and the output voltage is adjustable from 0.8 V to 24 V based on a resistor divider and the 0.8 V +/- 3 percent reference.

This new device is ideal for various end products including applications with 8 V to 50 V input voltage range needing a buck regulator for 3 A output current, consumer equipment power, uninterruptible power supplies, 12 V lighter-powered applications (portable DVD, etc.), automotive 12V or 24V input applications with higher voltage protection, point of sale (POS) applications, and industrial applications with 24 V or 36 V bus.

Allegro's A8498 is supplied in an eSOIC-8L package, is priced at $0.76 in quantities of 10,000 and has a 12 week lead-time to market.

About Allegro
Allegro MicroSystems, Inc. is a global leader in the development, manufacture and marketing of high-performance power integrated circuits and integrated Hall-effect magnetic sensors. Allegro's innovative, system-level solutions serve high-growth applications within the automotive, computer/office automation, industrial, consumer and communications markets, while our leading-edge product and processes reinforce our expertise in motor driver and power management technology. In addition, we also hold leading positions within printer, scanner, copier and portable device (e.g. cellular phones) applications. With more than 2,400 employees, Allegro is headquartered in Worcester, MA. Further information about Allegro can be found at

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