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.
Features
- 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
Applications
- Servers, telecom supplies, optical networking
- Distributed DC Power Systems (POL)
- FPGA, ASIC, µP Core supplies
- Industrial/Automotive/Communications
Typical Application
Associated Demo Circuits
Analog Devices Inc. DC2747A Demo Circuit
Designed to evaluate the performance of the LTC3315A synchronous step-down converters.
Analog Devices Inc. LTC3315B Demo Board DC2748
Designed to evaluate the LTC3315B dual 2A monolithic synchronous step-down converters.