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Triple-output step-down switching regulator
28 May 2008, Power Electronics / Power Management
Allegro Microsystems has developed a new triple-output step-down switching regulator. The A4490 provides three high-current, adjustable, high-performance switching regulator outputs with an input voltage range of 4,5 V to 34 V. Each output is adjustable from 0,8 V to 5 V with a maximum current of 2 A.
Multiphase switching reduces EMI and minimises stress on input capacitors by interleaving the turn-on cycle of the regulators. Features like soft-start, power-on reset output and a small 4 x 4 mm QFN package make this new device an ideal choice for many portable, office automation and consumer applications.
The 550 kHz fixed frequency switching allows selection of small, inexpensive inductors and ceramic output capacitors. A charge pump is used to provide the supply to drive the power switches to ensure operation at very wide operating duty cycle and to avoid the need for power draining clamp circuits.
A power-on reset circuit with programmable delay indicates when enabled regulators are in specification. The power-on reset flag also indicates when the input voltage drops below specification, giving the system controller advance warning whilst the switchers continue to operate down to the shutdown level. Internal diagnostics provide comprehensive protection against overloads, input under-voltages and over-temperatures. For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, schurches@arrow.altech.co.za, www.arrow.altech.co.za |
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