5V, 12.5A Synchronous Step-Down Silent Switcher in 3mm × 3mm LQFN

The LTC3311/LTC3311-X is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 12.5A of output current from a 2.25V to 5.5V input supply. The device employs Silent Switcher 1 architecture to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. For systems with higher power requirements, multi-phasing parallel converters is readily implemented.

The LTC3311/LTC3311-X uses a constant frequency, peak current mode control architecture for fast transient response. A 500mV reference allows for low voltage outputs. 100% duty cycle operation delivers low drop out.

Other features include a power good signal when the output is in regulation, precision enable threshold, output overvoltage protection, thermal shutdown, a temperature monitor, clock synchronization, mode selection and output short circuit protection. The device is available in a compact 18-lead 3mm × 3mm LQFN package.

APPLICATIONS

* Automotive/Industrial/Communications

* Servers, Telecom Power Supplies

* Distributed DC Power Systems (POL)

* FPGA, ASIC, μP Core Supplies

* Pin Compatible with LTC3310/LTC3310S and LTC3311S

* Silent Switcher® Architecture:

* Ultralow EMI Emissions

* High Efficiency—4.5mΩ NMOS and 16mΩ PMOS

* Wide Bandwidth, Fast Transient Response

* Safely Tolerates Inductor Saturation in Overload

* VIN Range: 2.25V to 5.5V

* VOUT Range: 0.5V to VIN

* VOUT Accuracy: ±1% with Remote Sense

* Peak Current Mode Control