Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A8498
Edited by the Electronicstalk Editorial
Team on 11 July 2006
Buck regulator accepts wide-ranging
inputs
A fixed-off-time current-mode-controlled buck switching regulator IC combines a 3A current rating with a wide input voltage range of 8 to 50V in a small surface-mount package.
The new A8498 from Allegro MicroSystems Europe is a fixed-off-time current-mode-controlled buck switching regulator IC that combines a 3A current rating with a wide input voltage range of 8 to 50V in a small surface-mount package The wide input voltage range makes the new device suitable for a wide range of industrial and consumer applications, including uninterruptible power supplies, 12V lighter-powered applications such as portable DVD players, automotive 12 or 24V input applications with higher voltage protection, point-of-sale equipment, and industrial systems based on 24 or 36V buses
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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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 integrated DMOS switch means that no external FET is needed.
An internal blanking circuit is used to filter out transients caused by the reverse recovery of the external clamp diode.
Typical blanking time is 200ns, and the output voltage is adjustable from 0.8 to 24V using a resistor divider and the 0.8V (+/-3%) reference.
The device exhibits a minimal change in efficiency across its full operating range, and has a low shutdown current to minimise power drain and extend battery life.
The A8498 is supplied in a low-profile eSOIC-8L surface-mount package with exposed pad.
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