Features

• Regulated Output with V_IN Above, Below or Equal to V_OUT
• 2.7V to 15V Input Voltage Range
• 2.5V to 14V Output Voltage Range
• 2.5A Continuous Output Current: V_IN ≥ 5V, V_OUT = 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, I_Q = 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

Description

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 R_DS(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.