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Boost controller with no sense resistor delivers 60V

Posted: 13 Jul 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LTC3872? DC/DC controller?

Linear Technology Corp. has introduced the LTC3872, a current mode step-up DC/DC controller with 550kHz operating frequency. According to the company, the device does not require a sense resistor, thus saving board space and improving efficiency.

The solution is for converting a 2.5-9.8V input voltage to a high output voltage. VOUT as high as 60V is achievable without a sense resistor, the company said; and when a sense resistor is used, the output voltage is limited only by external components. Linear said the device can easily attain very high peak currents, depending on the selection of the external MOSFET. The IC's high operating frequency reduces the value and size of the inductor and capacitors. Its small footprint and 90 percent operating efficiency make it possible to pack a high-current boost converter design in a very compact area, the company said. Applications include telecom power supplies, 42V automotive systems, 24V industrial control systems, IP phone power supplies and lithium battery-powered equipment.

The LTC3872 drives an external N-channel MOSFET to efficiently deliver the load current. Also, its current mode architecture allows cycle-by-cycle current limiting, lower output ripple voltage, low noise and excellent line and load transient response, Linear said. With pulse skipping operation at light loads, high efficiency is preserved, while the low operating current of 250A and shutdown current of 8A extend battery life. The device promises excellent AC and DC load and line regulation with 1.5 percent output voltage accuracy. Additional system and IC protection features include an internal soft start, which may be increased with an external capacitor, and precision under-voltage lockout.

The LTC3872 is offered in a thermally enhanced low-profile (0.75mm) 8-lead 2-by-3mm DFN package, as well as the ThinSOT package. The device is rated for -40⪚C to 125C junction temperature operation. 1,000-piece pricing starts at $1.80 each.

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Related Datasheets
Part Number Description Category
? LTC3872 No RSENSE Current Mode Boost DC/DC Controller ICs, Interface



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