Linear Tech Adds 24V Input Synchronous Step-Down Regulator

Linear Technology announced the LTC3610, a high efficiency, synchronous buck regulator which can deliver up to 12A of continuous output current at voltages as low as 0.6V. It operates from an input voltage of 4 to 24V (28V ABS Max), making it suitable for applications with multicell Li-Ion, lead acid batteries or fixed voltage rails up to 24V. 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. Switching frequencies of up to 1 MHz allow the utilization of small, low cost ceramic capacitors and low profile inductors.

The LTC3610 uses internal switches with an R_DS(ON) of only 12 and 6.5mΩ to deliver efficiencies as high as 95%. The LTC3610 can 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 while requiring only 900µA of quiescent current. No load quiescent current is only 15µA. Additional features include a Power Good voltage monitor, adjustable current limit, output overvoltage protection and programmable soft-start.

The LTC3610 is available from stock in a 64-lead, 9mm x 9mm QFN package. Pricing starts at $8.50 in 1,000-piece quantities.