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Step-down regulator delivers up to 6A

Posted: 21 Jan 2009     Print Version  Bookmark and Share

Keywords:buck regulator  output current  valley current 

Linear Technology Corp. has introduced the LTC3609, a high efficiency, synchronous buck regulator that can deliver up to 6A of continuous output current at voltages as low as 0.6V.

The device operates from an input voltage range of 4V to 32V (36V ABS Max), making it ideal for applications with multi-cell Li-Ion, lead acid batteries or fixed input voltage rails up to 32V. Its valley current control architecture delivers very low duty cycle operation at high frequencies with excellent transient response. The operating frequency is set by an external resistor. With a switching frequency of up to 1MHz, the LTC3609 can utilise small, low cost ceramic capacitors and low profile inductors.

The LTC3609 uses internal switches with an RRDS(ON) of only 18mΩ and 13mΩ to deliver efficiencies as high as 95 per cent. It can also be configured for discontinuous or forced continuous operation. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads, requiring only 900µA of quiescent current. Shutdown quiescent current is only 15µA. Additional features include a power good voltage monitor, adjustable current limit, output over-voltage protection and programmable soft-start.

The LTC3609EWKG is available from stock in a 52-lead, 7mm x 8mm QFN package. Pricing starts at Rs.387.78 ($7.75) each in 1,000-piece quantities. An industrial grade version, the LTC3609IWKG, is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at Rs.456.33 ($9.12) each in 1,000-piece quantities.

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