Analog Devices Inc. LTC3315A & LTC3315B Step-Down Converters

Analog Devices LTC3315A and LTC3315B Synchronous Step-Down Converters feature dual 2A monolithic synchronous step-down converters operating from a 2.25V to 5.5V input supply in one package. This makes the converters ideal for space-constrained applications with demanding performance requirements. Using constant frequency, peak current mode control at switching frequencies up to 3MHz with a minimum on-time as low as 25ns. This allows both bucks to achieve high efficiency and fast transient response in a very small application footprint.

The converters operate in forced continuous or pulse skip mode for low noise or in Burst Mode® operation for high efficiency at light loads. The common buck switching frequency is 2MHz and can be synchronized to an external oscillator via the MODE/SYNC pin. The converters can regulate outputs as low as 500mV. Features include precision enable thresholds, a PGOOD signal, output overvoltage protection, and thermal shutdown. They also include output short-circuit protection and up to 100% duty cycle operation for low dropout.


  • Dual outputs each with 2A output current
  • High efficiency of 19mΩ NMOS and 75mΩ PMOS
  • Wide bandwidth, fast transient response
  • Switching frequency synchronizable up to 3MHz
  • 2.25V to 5.5V VIN Range
  • 0.5V to VIN VOUT Range
  • ±1% VOUT Accuracy
  • Low Ripple Burst Mode® operation
  • Peak current mode control
  • 25ns Minimum on-time
  • Safely tolerates inductor saturation in overload
  • 1.2µA Shutdown current
  • Precision 400mV enable thresholds
  • Internal soft-start and compensation
  • Power Good output
  • Low profile, thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package


  • Servers, telecom supplies, optical networking
  • Distributed DC Power Systems (POL)
  • FPGA, ASIC, µP Core supplies
  • Industrial/Automotive/Communications

Typical Application

Application Circuit Diagram - Analog Devices Inc. LTC3315A & LTC3315B Step-Down Converters
Published: 2019-04-09 | Updated: 2023-09-11