5V, 4A, 10MHz Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN

The LTC3308B is a very small, high efficiency, low noise, monolithic synchronous 4A step-down DC/DC converter operating from a 2.25V to 5.5V input supply. Using constant frequency, peak current mode control at switching frequencies 3MHz to 10MHz and minimum on-time as low as 22ns, this regulator achieves fast transient response with small external components. Silent Switcher architecture minimizes EMI emissions.

The LTC3308B operates in forced continuous or pulse-skipping mode for low noise, or low-ripple Burst Mode operation for high efficiency at light loads, ideal for battery-powered systems. The IC regulates output voltages as low as 500mV. Other features include output overvoltage protection, short-circuit protection, thermal shutdown, clock synchronization, and up to 100% duty cycle operation for low dropout.

The LTC3308B is available in a low profile 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed pad for low thermal resistance.

APPLICATIONS

* Optical Networking, Servers, Telecom

* Automotive, Industrial, Communications

* Distributed DC Power Systems (POL)

* FPGA, ASIC, μP Core Supplies

* Pin Compatible with LTC3307(3A) and LTC3309(6A)

* High Efficiency: 8mΩ NMOS, 31mΩ PMOS

* Programmable Frequency 3MHz to 10MHz

* Tiny Inductor and Capacitors

* Peak Current Mode Control

* 22ns Minimum On-Time

* Wide Bandwidth, Fast Transient Response

* Silent Switcher® Architecture

* Ultralow EMI Emissions