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LTC3112 - 15V, 2.5A Synchronous Buck-Boost DC/DC Converter

The LTC®3112 is a fixed frequency synchronous buck-boost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage.

With an input range of 2.7V to 15V, the LTC3112 is wellsuited for a wide variety of single or multiple cell battery, backup capacitor or wall adapter source applications. Low RDS(ON) internal N-Channel MOSFET switches provide highly efficient operation in applications with higher load current requirements.

The LTC3112 features selectable PWM or Burst Mode operation, an easily synchronized oscillator and output disconnect in shutdown. An output current monitor circuit allows the load current to be controlled or measured. Other features include <1μA shutdown current, short circuit protection, soft-start, current limit and thermal shutdown.

The LTC3112 is offered in both a 16-pin (4mm × 5mm × 0.75mm) DFN and 20-pin TSSOP packages.

Features 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 and 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 and 20-Lead TSSOP Package Typical Application

Applications 3.3V or 5V from 1, 2 or 3 Li-Ion, Backup Capacitor Stack Hand Held Inventory Terminals RF Transmitters 12V Synchronous Boost Converter Multiple Power Input Systems LED Lighting with Current Regulation 12V Lead Acid Battery to 12V Packaging

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