Linear Tech 32V Synchronous Step-Down Regulator Delivers 6A From A 7 x 8mm QFN
Linear Technology announced is new LTC3609 – a high efficiency, synchronous buck regulator that can deliver up to 6A of continuous output current at voltages as low as 0.6V. It operates from an input voltage range of 4 to 32V (36V ABS Max), making it suitable for applications with multicell Li-Ion, lead acid batteries or fixed input voltage rails up to 32V. Its valley current control architecture is said to deliver 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 utilize small, low cost ceramic capacitors and low profile inductors.
The LTC3609 uses internal switches with an RDS(ON) of only 18mΩ and 13mΩ to deliver efficiencies as high as 95%. 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 overvoltage protection and programmable soft-start.
The LTC3609EWKG is available from stock in a 52-lead, 7 x 8mm QFN package. Pricing starts at $7.75 each in 1,000-piece quantities. An industrial grade version, the LTC3609IWKG, is tested and guaranteed to operate from a -40 to 125°C operating junction temperature and is priced at $9.12 each in 1,000-piece quantities.
