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Three-output DC-DC controllers with tracking/sequencing reduce 40nm logic devices costs

May 18, 2010 | Paul Buckley | 222900950
Three-output DC-DC controllers with tracking/sequencing reduce 40nm logic devices costs Maxim Integrated Products has introduced low-cost, three-output, synchronous step-down controllers with tracking (MAX15048) or sequencing (MAX15049) options designed to meet the tight tolerances of small-geometry logic devices.

The controllers drive external  MOSFETs to deliver a regulated 0.6 V to 19 V output voltage and up to 15 A of load current per output.

Additionally, integrated tracking/sequencing allows customers to seamlessly control core and I/O voltages. This combination of versatility, integration, and performance makes the MAX15048/MAX15049 well suited for a variety of high-reliability power-supply applications such as those in telecom, networking, storage, and server equipment.

The MAX15048/MAX15049 are precision engineered to eliminate external components and save costs. They operate from a wide 4.7 V to 23 V input range to support low-cost battery packs, as well as the latest 40 nm ASICs. Each PWM section operates from a programmable switching frequency (200 kHz to 1.2 MHz). Operating at 1.2 MHz and 120 degrees out-of-phase increases the input capacitor ripple frequency to 3.6 MHz. This reduces the RMS input ripple current and, thus, the size of the input bypass capacitor. The MAX15048/MAX15049 integrate bootstrap diodes for additional system cost savings.

The devices feature digital soft-start/soft-stop for glitch-free  power-up and power-down. Power-good circuitry monitors all three outputs and provides a signal to the system controller/processor when all outputs are within regulation to enable system-level monitoring.

Integrated protection features include lossless valley-mode current limiting, hiccup-mode output short-circuit protection, and thermal shutdown.

Availability and Pricing

The MAX15048/MAX15049 are offered in a thermally enhanced, 5 mm x 5 mm, 32-pin TQFN package, and are fully specified over the -40 to +85 degrees Celsius extended temperature range. Prices start at 3.10 US Dollars (1000-up, FOB USA).

An evaluation kit, the MAX15048EVKIT+, is available to speed design times and is priced at 125 US Dollars.

Datasheet: MAX15048

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