Features and Benefits
- Wide VIN Range: 5.5V to 36V Operation
- 2-Phase Operation Reduces Input and Output Capacitance
- Fixed Frequency, Peak Current Mode Control
- Internal 10V LDO Regulator
- Lower UVLO Thresholds Allows the Use of MOSFETs Rated at 6V VGS
- Adjustable Slope Compensation Gain
- Adjustable Max Duty Cycle (Up to 96%)
- Adjustable Leading Edge Blanking
- ±1% Internal Voltage Reference
- Programmable Operating Frequency with One External Resistor (75kHz to 500kHz)
- Phase-Lockable Fixed Frequency 50kHz to 650kHz
- SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or 12-Phase Operation (PHASEMODE Programmable)
- 24-Lead Narrow SSOP Package
- 5mm × 5mm QFN Package with 0.65mm Lead Pitch
- 24-Lead Thermally Enhanced TSSOP Package
The LTC3862-2 is a two-phase constant frequency, current mode boost and SEPIC controller that drives N-channel power MOSFETs. Two-phase operation reduces system filtering capacitance and inductance requirements.
The operating frequency can be set with an external resistor over a 75kHz to 500kHz range and can be synchronized to an external clock using the internal PLL. Multiphase operation is possible using the SYNC input, the CLKOUT output and the PHASEMODE control pin allowing 2-, 3-, 4-, 6- or 12-phase operation.
Other features include an internal 10V LDO with undervoltage lockout protection for the gate drivers, a precision RUN pin threshold with programmable hysteresis, soft-start and programmable leading edge blanking and maximum duty cycle.
|Part Number||Vin Range||INTVcc||UV+||UV-|
|LTC3862||4V to 36V||5V||3.3V||2.9V|
|LTC3862-1||8.5V to 36V||10V||7.5V||7.0V|
|LTC3862-2||5.5V to 36V||10V||4.4V||3.9V|
- Automotive, Telecom and Industrial Power Supplies
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 (3)
Demonstration circuit 2006A-A is a multiphase high power, high voltage step-up DC/DC converter featuring the LTC3862-2 boost controller. This demo board converts a 6V to 36V input voltage to a 50V output at up to 10A with four phases by utilizing and synchronizing two LTC3862-2 controller IC’s.
Demonstration circuit 2006A-B is a multiphase high power, high voltage step-up DC/DC converter featuring two the LTC3862-2 boost controllers. This demo board converts a 6V to 36V input voltage to a 120V output at up to 2.5A with two stages. The first stage converts the input voltage to 50V. The second stage converts the 50V to 120V and each stage uses one LTC3862-2.
Demonstration circuit 1891A is a 2-phase high efficiency nonisolated SEPIC (Single Ended Primary Inductor Converter) converter featuring the LTC3862-2 switching controller. The DC1891A converts a 6V to 60V input to a 12V output and provides 6A of output current. The DC1891A can be easily modified to generate output voltages in the range from 0.8V to 48V.
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
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.
LTpowerCAD Project Files
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.