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Efficient boost controller does away with heat sink

Posted: 02 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous step-up controller? boost controller? heat sink?

Linear Technology Corp. has rolled out a synchronous step-up controller that eliminates the boost diode and heat sink normally required in medium- to high-power non-synchronous boost converters.

The LTC3814-5 can regulate output voltages up to 60V and has powerful 1? onboard dual n-channel MOSFET gate drivers that are capable of supplying high currents to slew large MOSFET gates quickly. This minimizes transition losses and allows paralleling of MOSFETs for higher current applications. The LTC3814-5 can regulate a 24V at 4A output with up to 97 percent efficiency from a 4.5-14V input source.

Applications include automotive, avionics, telecom, networking equipment, servers, industrial control systems and base stations where a step-up DC/DC converter must deliver high power with low heat dissipation in a small solution size.

The LTC3814-5 utilizes current mode control and maintains 0.875 percent reference voltage accuracy over an operating temperature range of -40C to 85C. In addition, this part uses a constant off-time peak current control architecture and a high bandwidth (25MHz) error amplifier that provides very fast line and load transient response. The constant off-time current mode architecture provides accurate cycle-by-cycle current limit protection, a feature that is essential to protect the high voltage output from over-current conditions.

The operating frequency is selected by an external resistor from 100kHz to 1MHz, which is also compensated for VIN variations and can be synchronized to an external clock for noise sensitive applications. The LTC3814-5 has programmable soft-start, undervoltage lockout on the driver supply, output overvoltage protection and a power good signal that monitors the output voltage.

The LTC3814-5 is offered in a thermally enhanced TSSOP-16 package. Pricing in 1,000-piece quantities begins at $3.50 each.

- Ismini Scouras

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