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Amplifiers/Converters??

Switching regulator eliminates heat sink, boost diode

Posted: 20 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous No RSENSE switching regulator? eliminate heat sink boost diode? base stations?

Linear Technology Corp.'s LTC3813 is a synchronous No RSENSE step-up switching regulator controller that eliminates the boost diode and the heat sink normally required in medium to high power non-synchronous boost converters.

LTC3813 can regulate output voltages up to 100V and has 1 on-board 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. In addition, LTC3813 can regulate a 50V at 4A output with up to 97 percent efficiency from a 10-40V 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 package.

The LTC3813 device uses current mode control and maintains 0.875 percent reference voltage accuracy over an operating temperature range of -40C to 85C.

The device uses a constant, off-time peak current control architecture and has 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.

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. LTC3813 has a programmable soft-start, programmable undervoltage lockout and a power good signal that monitors the output voltage.

Offered in the SSOP-28 package, which provides three unconnected pins between adjacent high and low voltage pins for extra PC board trace clearance, LTC3813 is compliant with circuit board design standard IPC-2221 regarding high voltage pin spacing.

The device is available now. Pricing for 1,000-piece quantities begins at $3.75 each.

- Ismini Scouras
eeProductCenter




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