The LTC3611 operates from an input voltage of 4.5V to 32V (36V ABS Max), making it suitable for applications with multicell Li-Ion, lead acid batteries or fixed 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. Switching frequencies of up to 1MHz allow the utilization of small, low cost ceramic capacitors and low profile inductors.
The LTC3611 uses internal switches with an RDS(ON) of 15mOhm and 9mOhm to deliver efficiencies of 95%. The LTC3611 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. Additional features include a Power Good voltage monitor, adjustable current limit, output overvoltage protection and programmable soft-start.
The LTC3611EWP is available in a 64-lead, 9-mm x 9-mm QFN package.
Pricing: Starts at $9.75 in 1,000-piece quantities. An industrial grade version, the LTC3611IWP is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $11.21.
Datasheet: Click here.
Linear Technology, www.linear.com