Analog Devices Inc. LTC3308A/B Synchronous Step-Down Silent Switcher™

Analog Devices Inc. LTC3308A/B Synchronous Step-Down Silent Switcher™ is a very small, high efficiency, low noise, monolithic synchronous 4A step-down DC/DC converter. It operates from a 2.25V to 5.5V input supply. Using constant frequency, peak current mode control at switching frequencies up to 3MHz, and minimum on-time as low as 22ns, this regulator achieves fast transient response with small external components. A Silent Switcher architecture minimizes EMI emissions.

The LTC3308x operates in forced continuous or pulse skip mode for low noise or low-ripple Burst Mode operation for high efficiency at light loads. This makes the device 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 device is available in a low profile 12-lead 2mm×2mm×0.74mm LQFN package with an exposed pad for low thermal resistance.


  • High efficiency: 8mΩ NMOS, 31mΩ PMOS
  • Programmable frequency to 3MHz
    • Tiny inductor and capacitors
  • Peak current-mode control
    • 22ns minimum on-time
    • Wide bandwidth, fast transient response
  • Silent Switcher™ architecture
    • Ultra-low EMI emissions
  • Low ripple Burst Mode® operation with IQ of 40μA
  • Safely tolerates inductor saturation in overload
  • 2.25V to 5.5V VIN range
  • 0.5V to VIN VOUT range
  • ±1% over temperature range VOUT accuracy
  • Precision 400mV enable threshold
  • 1μA shutdown current
  • 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
Publicado: 2019-12-04 | Actualizado: 2022-03-11