Analog Devices LTC3112

Description

The LTC®3112 is a fi xed 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 effi cient operation in applications with higher loadcurrent 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% Effi ciency
• 750kHz Switching Frequency, SynchronizableBetween 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 or 20-Lead TSSOP Package

Note:It is recommended that the inductor value be chosen less than15μH if the converter is to be used in the boost region.For 750kHz operation, a 4.7μH inductor is recommendedfor 5VOUT and a 10μH inductor for 12VOUT.

Typical applications

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

More information

• Datasheet
• IC product information