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Maxim launches two new SMPS controllers

Posted: 09 Nov 2004 ?? ?Print Version ?Bookmark and Share

Maxim Integrated Products introduced two dual, step-down, switch-mode power-supply (SMPS) controllers with synchronous rectification for main 5V/3.3V power generation in battery-powered systems.

According to the company, fixed-frequency operation with optimal interleaving minimizes input ripple current from the lowest input voltage up to the 26V maximum input. Using a sense resistor, output current sensing provides an accurate current limit. Alternatively, power dissipation can be reduced using loss-less inductor current sensing.

Internal 5V and 3.3V linear regulators power the MAX1533 and MAX1537 devices and their gate drivers, as well as external keep-alive loads to a total of 100mA. When the main PWM regulators are in regulation, automatic bootstrap switches bypass the internal linear regulators and provide currents up to 200mA from each linear output. The MAX1537 features an additional adjustable, internal 150mA linear regulator typically used with a secondary winding to provide a 12V supply.

The new SMPS controllers include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and an internal soft-shutdown output discharge that prevents negative voltages on shutdown.

Both products offer optional inductor-saturation protection, and overvoltage/undervoltage protection. The MAX1533 is available in a 32-pin TQFN package, while the MAX1537 is housed in a 36-pin TQFN package. Screened for the industrial temperature range, the MAX1533's prices start at $5.10 and the MAX1537's prices start at $5.20, both for 1,000-up, FOB USA. Pre-assembled MAX1533EVKIT and MAX1537EVKIT evaluation kits are available with recommended external components to speed designs.

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