Analog Devices Inc. LTC3307A/B Step-Down Silent Switcher™

Analog Devices Inc. LTC3307A/B Step-Down Silent Switcher™ is a very small, high efficiency, low noise, monolithic synchronous 3A 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 up to 3MHz, and minimum on-time as low as 22ns, the LTC3307A/B achieves fast transient response with small external components. The Silent Switcher architecture also minimizes EMI emissions. 

The LTC3307A/B operates in forced continuous or pulse skip 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/short-circuit protection, thermal shutdown, clock synchronization, and up to 100% duty cycle operation for low dropout. The device is available in a 2mm × 2mm × 0.74mm Low-Profile Quad Flat No-Lead (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
    • Ultralow EMI Emissions
  • Low Ripple Burst Mode® Operation with IQ of 40µA
  • Safely Tolerates Inductor Saturation in Overload
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN
  • VOUT Accuracy: ±1% Over Temperature Range
  • Precision 400mV Enable Threshold
  • Shutdown Current: 1µA
  • Internal Compensation and Soft Start
  • Power Good Output
  • Thermally Enhanced 2mm × 2mm LQFN Package


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

Block Diagram

Block Diagram - Analog Devices Inc. LTC3307A/B Step-Down Silent Switcher™

Typical Application Circuit

Application Circuit Diagram - Analog Devices Inc. LTC3307A/B Step-Down Silent Switcher™
Published: 2019-10-09 | Updated: 2023-06-22