Linear Technology Corp. 40V, 2A Buck-Boost Converter Tony Armstrong Director of Product Marketing, Power Products

© 2011 Linear Technology 2 Why the Need for the LTC3115-1? 1)Regulated Output with Input Above, Below or Equal to V OUT Enables Continual Operation Even with Wide Input Fluctuations: Example: Automotive Application with Input Ranging from 3.3V in Cold-Crank to 36V Transient During Load-Dump Scenario, when Output Must Be a Continuous 5V 2)Operation from 2.7V to 40V is Ideal for Wide Range of Input Power Sources: From Single/dual/triple-Cell Li-Ion, to USB, FireWire, Wall Adapter or Automotive Inputs 3)When Well-Regulated Output is Required with a Discharging Energy Storage Device, i.e. Battery or SuperCapacitor 4)For 5V Output, LTC3115 can Deliver up to 2A when V IN >6V, and 1A when V IN >3.6 5)Up to 95% Efficiency Maximizes Battery Run-Time and Minimizes Thermal Constraints 6)Very Low I Q (< 50uA) Preserves Battery Life During Standby/Light Load Operation 7)Very Simple, Compact Footprint

© 2011 Linear Technology 3 2A Monolithic Synchronous Buck-Boost DC/DC Converter Regulated Output with Input Voltage Above, Below or Equal to the Output Voltage Wide V IN Range: 2.7V to 40V Wide V OUT Range: 2.7V to 40V Low Noise Buck-Boost Architecture (<5mV PK-PK in PWM Mode) LTC3115-1: What Is It?

© 2011 Linear Technology 4 LTC3115-1: Key Features Wide V IN Range: 2.7V to 40V Wide V OUT Range: 2.7V to 40V 1A Output Current for V IN ≥ 3.6V, V OUT = 5V 2A Output Current in Step-Down Operation for V IN ≥ 6V Programmable Frequency: 100kHz to 2MHz Supports Synchronization with an External Clock Up to 95% Efficiency 50μA Burst Mode R Quiescent Current Ultralow Noise Buck-Boost PWM Internal Soft-Start 3μA Supply Current in Shutdown Programmable Input Undervoltage Lockout Small 4mm × 5mm × 0.75mm DFN Package or Thermally Enhanced 20-Lead TSSOP Package

© 2011 Linear Technology 5 LTC3115-1: Typical Application Schematic

© 2011 Linear Technology 6 LTC3115-1: Efficiency of Typical Application V OUT =5V

© 2011 Linear Technology 7 LTC3115-1: Packages

© 2011 Linear Technology 8 How the LTC Fits with Our Other Synchronous Buck-Boost DC/DC Converters

© 2011 Linear Technology 9 LTC3115-1: Typical Applications

© 2011 Linear Technology 10 LTC3115-1: Release Schedule Data Sheet: Now Samples: Now Production Release: November 2011