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25A step-down regulator fits in 8mm x 8mm TQFN

Posted: 21 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:step-down regulators? TQFN package? switching regulator?

Maxim Integrated Products has introduced the MAX8655, claimed to be the first switching, step-down regulator to incorporate the MOSFETs and to shrink regulator packaging into the industry's smallest footprintan 8mm x 8mm x 0.8mm (height) TQFN.

This device provides output currents of up to 25A. A wide 4.5V to 25V input-voltage range allows for internal bus architecture (IBA) applications, where input voltage can have a two-to-one variation. A breakthrough in power density, output current and size, the MAX8655 is suitable for any application in which space, power and versatility are crucial.

Power density vs. board space
Today's complex boards in server, datacom and telecom applications, for example, must squeeze more voltages into ever-smaller spaces. Increasing the number of power supplies on the board requires a commensurate increase in power density. To compound the situation, while power management is critical to the integrity of any design, it is always the last problem to be solved. Designers, therefore, usually struggle with too little board space remaining and little or no time for revisiting the design.

Given this typical dilemma, designers traditionally turn to discrete solutions for power management. However, discrete solutions pose their own problems. Board size is much larger when using discrete components. Board trace inductance is also a common problem that leads to undesired EMI and stress on the semiconductor devices, typically forcing second and third passes before a design is successful.

Power-to-size challenge
It is crucial that power management be small and versatile within today's power-hungry applications. Maxim's new proprietary PowerMind products, which include the new MAX8655 regulator, solve the space constraint issue and offer both versatility and simplicity of use.

Though packaged in a TQFN, the MAX8655 does not compromise control features. Built-in MOSFETs incorporate all the critical inductances and eliminate undesired parasitic board inductances. By integrating discrete MOSFETs, the MAX8655 not only reduces space, but also lowers the generated EMI and virtually assures first-pass design.

Peak current-mode control at up to 1.2MHz switching simplifies compensation, allows for all types of output capacitors, and inherently provides feed-forward for optimum line regulation. Together with this peak current-mode-control topology, accurate current sensing enables paralleling in multiphase fashion. As a result, higher output currents are achieved and smaller output-filter components are required.

Designed with powerful programmable capabilities, the MAX8655 is highly flexible and versatile. Programmable features include slope compensation, OVP threshold, shortcircuit protection, frequencies and current limit (either latchoff or current fold-back with autorecovery overcurrent protection). Sync input/output and thermal protection are standard features that assure safe operation under all conditions.

An evaluation kit will soon be available. Pricing for the MAX8655 starts at $3.78 (10,000-up, FOB USA).

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