15VIN, 2.5A Synchronous Buck-Boost DC/DC Converter Features Integrated Power MOSFETs, 95% Efficiency & Low Noise Operation
Linear Technology announces the LTC3112, a synchronous buck-boost converter that delivers up to 2.5A of output current from a wide range of power sources, including single or multiple cell batteries, super capacitor stacks and wall adapters. Its 2.7V to 15V input range and 2.5V to 14V output range provides a regulated output with inputs above, below or equal to the regulated output. The low noise buck-boost topology incorporated in the LTC3112 provides a continuous, jitter-free transition between buck and boost modes, making it ideal for RF and other noise-sensitive applications that must maintain a low-noise constant output voltage with a variable input power source. In many applications, battery run time is significantly extended over step-down only solutions. The LTC3112's default 750kHz switching frequency, that can be synchronized to an external 300KHz to 1.5MHz clock, and proprietary third generation buck-boost PWM circuitry ensure low noise and high efficiency while minimizing the size of external components. The combination of tiny externals and a 4mm × 5mm DFN or TSSOP-20E package provides a compact solution footprint.
The LTC3112 includes four internal low RDS(ON) N-channel MOSFETs to deliver efficiencies of up to 95%. User-selectable Burst Mode® operation lowers quiescent current to only 50µA, improving light load efficiency and extending battery run time. For noise-sensitive applications, Burst Mode operation can be disabled. The LTC3112 also offers an integrated output current monitor that enables the load current to be monitored or controlled to a constant value. Other features include soft-start, overvoltage protection, short circuit protection, thermal shutdown and output disconnect.
LTC3112EDHD is available in a 16-lead 4mm × 5mm DFN package and the LTC3112EFE is available in a thermally enhanced 20-lead TSSOP package. Pricing starts at $4.00 each and $4.15 each, respectively for 1,000 piece quantities. Industrial grade versions, the LTC3112IDHD and LTC3112IFE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range and are priced at $4.40 and $4.57 each, respectively, in 1,000-piece quantities. All versions are available from stock. For more information, visit www.linear.com/product/LTC3112.
Summary of Features: LTC3112
- 15V, 2.5A Synchronous Buck-Boost Regulator
- Regulated Output with VIN Above, Below or Equal to VOUT
- 2.7V to 15V Input Voltage Range
- 2.5V to 14V Output Voltage Range
- 2.5A Continuous Output Current: VIN = 5V, VOUT = 5V, PWM Mode
- Output Current Monitor
- Up to 95% Efficiency
- 750kHz Switching Frequency, Synchronizable Between 300kHz & 1.5MHz
- Internal N-Channel MOSFETs
- Selectable Burst Mode® Operation, IQ = 50µA
- Shutdown Current < 1µA
- Overvoltage Protection
- Output Disconnect in Shutdown
- Internal Soft-Start
- Small, Thermally Enhanced 16-Lead (4mm × 5mm × 0.75mm) DFN or 20-Lead TSSOP Package
2.5A, 15V Synchronous Buck Boost DC/DC Converter Enables a Multitude of Input Sources
Editor's Contact Information
- Doug Dickinson