LTC3308B Datasheet

• 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
• Low Ripple Burst Mode^®Operation with IQ of 40μA
• Safely Tolerates Inductor Saturation in Overload
• V_IN Range: 2.25V to 5.5V
• V_OUT Range: 0.5V to V_IN
• V_OUT Accuracy: ±1% Over Temperature Range
• Precision 400mV Enable Threshold, 1μA in Shutdown
• Power Good, Internal Compensation and Soft-Start
• Thermally Enhanced 2mm × 2mm LQFN Package
• AEC-Q100 Qualified for Automotive Applications

• Optical Networking, Servers, Telecom
• Automotive, Industrial, Communications
• Distributed DC Power Systems (POL)
• FPGA, ASIC, μP Core Supplies

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.