LTC3608 Step-down regulator

The LTC3608 is a synchronous buck regulator that can deliver up to 8 A of continuous current at voltages as low as 0.6.

It operates from an input voltage range of 4 to 18 (20 ABS max), making it suitable for applications with multicell Li-Ion, lead acid batteries or fixed voltage rails up to 15. Its valley current control architecture delivers low duty cycle operation at high frequencies with good transient response.

The operating frequency is set by an external resistor. Switching frequencies of up to 1 MHz allow the use of small, low-cost ceramic capacitors and low-profile inductors.

The device uses internal switches with an R_DS(ON) of only 10 and 8 mΩ to deliver efficiencies to 95%. The regulator 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 requiring 900 µA of quiescent current. Shutdown quiescent current is only 15 µA. Additional features include a Power Good voltage monitor, adjustable current limit, output overvoltage protection and programmable soft-start.