42V, 2.5A Synchronous Step-Down Regulator with No-Loss Input PowerPath
Features and Benefits
- Integrated High Efficiency Dual Input PowerPath™ Plus Buck-Boost DC/DC Converter
- Ideal Diode or Priority VIN Select Modes
- VIN1 and VIN2 Range: 2.2V to 18V
- VOUT Range: 2V to 18V
- Either VIN Can Be Above, Below or Equal to VOUT
- Generates 5V at 2A for VIN > 6V
- 1.2MHz Low Noise Fixed Frequency Operation
- Current Mode Control
- All Internal N-Channel MOSFETs
- Pin-Selectable PWM or Burst Mode® Operation
- Accurate, Independent RUN Pin Thresholds
- Up to 94% Efficiency
- VIN and VOUT Power Good Indicators
- IQ of 50μA in Sleep, 2μA in Shutdown
- 4mm × 5mm 24-Lead QFN or 28-Lead TSSOP Packages
The LTC3118 is a dual-input, wide voltage range synchronous buck-boost DC/DC converter with an intelligent, integrated, low loss PowerPath control. The unique power switch architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability of up to 18V provides flexibility and voltage margin for a wide variety of applications and power sources.
The LTC3118 uses a low noise, current mode architecture with a fixed 1.2MHz PWM mode frequency that minimizes the solution footprint. For high efficiency at light loads, automatic Burst Mode operation can be selected consuming only 50μA of quiescent current in sleep.
System level features include ideal diode or VIN priority modes, VIN and VOUT power good indicators, accurate RUN comparators to program independent UVLO thresholds, and output disconnect in shutdown. Other features include 2μA shutdown current, short-circuit protection, soft-start, current limit and thermal overload protection.
The LTC3118 is offered in thermally enhanced 24-lead 4mm × 5mm QFN and 28-lead TSSOP packages.
- Systems with Multiple Input Sources
- Back Up Power Systems
- Wall Adapter or Li-Ion(s) Input to 5VOUT
- Battery or Super Capacitor Input for Reserve Power
- Replace Diode-OR Designs with Higher Efficiency, Flexibility and Performance
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration Circuit 2045A featuring the LTC3118 is a dual input fixed frequency synchronous buck-boost converter with an intelligent integrated low-loss Power-Path™. The unique all N-Channel architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability of up to 18V provides flexibility and voltage margin for a variety of applications and power sources.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
Design tools for the following parts are available in LTpowerCAD:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.