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LTC3115EFE-1#PBF

LTC3115EFE-1#PBF

Analog Devices
Alternative synchronous buck-boost regulator with adjustable output suitable for battery-powered systems.
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Overview

The LTC3115EFE-1 is a synchronous buck-boost DC/DC regulator in an adjustable output configuration. It supports step-up and step-down conversion over a wide input range (about 2.2 V to 40 V) and can produce outputs up to 40 V with adjustable setpoints. The device is intended for battery-powered and variable-supply systems where input voltage can move above or below the required output.

Why Choose This Part

Wide input and output ranges let the LTC3115EFE-1 handle inputs that are both above and below the desired output without a separate boost or buck stage. Its synchronous buck-boost topology gives better efficiency than asynchronous designs for many duty cycles, which helps in battery-powered designs. The adjustable output up to high voltages (specified to 40 V) makes it useful for higher-voltage rails while keeping size and component count lower than dual-converter solutions.

Applications

Battery-powered portable systems
Maintain a stable system rail from a single cell or multi-cell battery whose voltage varies during discharge and charge.
Automotive and vehicular electronics
Generate regulated rails from a 12 V/24 V automotive supply that can dip during cranking or rise during load dump (where applicable within the device limits).
Solar-powered or energy-harvesting systems
Regulate output while input from panels or energy sources varies above and below the target bus voltage.
Industrial sensors and instrumentation
Provide a regulated supply for sensors and data-acquisition electronics when the local supply can vary widely.

Key Specifications

Function Step-Up/Step-Down
Topology Buck-Boost
Output Type Adjustable
Mounting Type Surface Mount
Package / Case 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Current - Output 1A, 2A
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 100kHz ~ 2MHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier Yes
Voltage - Input (Max) 40V
Voltage - Input (Min) 2.2V
Voltage - Output (Max) 40V
Supplier Device Package 20-TSSOP-EP
Voltage - Output (Min/Fixed) 2.7V

Getting Started

Begin with the LTC3115E datasheet and the manufacturer's recommended layout and component selection; careful PCB layout for the switching nodes and placement of input/output capacitors and the inductor is critical for performance. Analog Devices offers evaluation boards and reference designs for the LTC3115 family that you can use to prototype and evaluate settings before committing to a production layout. Pay attention to thermal management and peak current limits during evaluation.