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Step-down regulator carries 8A continuous output at 0.6V

Posted: 07 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:step-down regulator? synchronous buck regulator? Li-ion battery?

Linear Technology has released the LTC3608 high efficiency, synchronous buck regulator that can deliver up to 8A of continuous output current at voltages as low as 0.6V.

The device operates from an input voltage range of 4V to 18V (20V ABS max), making it suitable for applications with multicell Li-ion, lead acid batteries or fixed voltage rails up to 15V. Its valley current control architecture delivers very low duty cycle operation at high frequencies with fast transient response. The operating frequency is set by an external resistor. Switching frequencies of up to 1MHz allow the utilization of small, low cost ceramic capacitors and low profile inductors.

In addition, the LTC3608 uses internal switches with an RDS(ON) of only 10m? and 8m? to deliver efficiencies as high as 95 percent. The LTC3608 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 900?A of quiescent current. Shutdown quiescent current is only 15?A. Additional features include a Power Good voltage monitor, adjustable current limit, output overvoltage protection and programmable soft-start.

The LTC3608EWKG is available from stock in a 52-lead, 7mm x 8mm QFN package. Pricing starts at $7.50 in 1,000-piece quantities. An industrial grade version, the LTC3608IWKG is tested and guaranteed to operate from a -40C to 125C operating junction temperature and is priced at $8.63 in 1,000-piece quantities. All versions are available from stock.

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