LTC3862 - Multi-Phase Current Mode Step-Up DC/DC Controller
Features
- Wide VIN Range: 4V to 36V Operation
- 2-Phase Operation Reduces Input and Output Capacitance
- Fixed Frequency, Peak Current Mode Control
- 5V Gate Drive for Logic-Level MOSFETs
- 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)
- Internal 5V LDO Regulator
- 24-Lead Narrow SSOP Package
- 5mm × 5mm QFN with 0.65mm Lead Pitch and 24-Lead Thermally Enhanced TSSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3862 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. Multi-phase 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 5V 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 |
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3862EFE#PBF | TSSOP-24 | FE | E | 05-08-1771 | Yes |
| LTC3862EFE#TRPBF | TSSOP-24 | FE | E | 05-08-1771 | Yes |
| LTC3862EGN#PBF | SSOP-24 | GN | E | 05-08-1641 (GN24) | Yes |
| LTC3862EGN#TRPBF | SSOP-24 | GN | E | 05-08-1641 (GN24) | Yes |
| LTC3862EUH#PBF | 5x5 QFN-24 | UH | E | 05-08-1747 | Yes |
| LTC3862EUH#TRPBF | 5x5 QFN-24 | UH | E | 05-08-1747 | Yes |
| LTC3862HFE#PBF | TSSOP-24 | FE | H | 05-08-1771 | Yes |
| LTC3862HFE#TRPBF | TSSOP-24 | FE | H | 05-08-1771 | Yes |
| LTC3862HGN#PBF | SSOP-24 | GN | H | 05-08-1641 (GN24) | Yes |
| LTC3862HGN#TRPBF | SSOP-24 | GN | H | 05-08-1641 (GN24) | Yes |
| LTC3862HUH#PBF | 5x5 QFN-24 | UH | H | 05-08-1747 | Yes |
| LTC3862HUH#TRPBF | 5x5 QFN-24 | UH | H | 05-08-1747 | Yes |
| LTC3862IFE#PBF | TSSOP-24 | FE | I | 05-08-1771 | Yes |
| LTC3862IFE#TRPBF | TSSOP-24 | FE | I | 05-08-1771 | Yes |
| LTC3862IGN#PBF | SSOP-24 | GN | I | 05-08-1641 (GN24) | Yes |
| LTC3862IGN#TRPBF | SSOP-24 | GN | I | 05-08-1641 (GN24) | Yes |
| LTC3862IUH#PBF | 5x5 QFN-24 | UH | I | 05-08-1747 | Yes |
| LTC3862IUH#TRPBF | 5x5 QFN-24 | UH | I | 05-08-1747 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3862EFE#PBF | TSSOP-24 | E | $4.87 | $3.41 | Yes | |
| LTC3862EFE#TRPBF | TSSOP-24 | E | $3.47 | Yes | ||
| LTC3862EGN#PBF | SSOP-24 | E | $4.70 | $3.29 | Yes | |
| LTC3862EGN#TRPBF | SSOP-24 | E | $3.35 | Yes | ||
| LTC3862EUH#PBF | 5x5 QFN-24 | E | $4.70 | $3.29 | Yes | |
| LTC3862EUH#TRPBF | 5x5 QFN-24 | E | $3.35 | Yes | ||
| LTC3862HFE#PBF | TSSOP-24 | H | $5.89 | $4.12 | Yes | |
| LTC3862HFE#TRPBF | TSSOP-24 | H | $4.18 | Yes | ||
| LTC3862HGN#PBF | SSOP-24 | H | $5.71 | $4.00 | Yes | |
| LTC3862HGN#TRPBF | SSOP-24 | H | $4.06 | Yes | ||
| LTC3862HUH#PBF | 5x5 QFN-24 | H | $5.71 | $4.00 | Yes | |
| LTC3862HUH#TRPBF | 5x5 QFN-24 | H | $4.06 | Yes | ||
| LTC3862IFE#PBF | TSSOP-24 | I | $5.46 | $3.82 | Yes | |
| LTC3862IFE#TRPBF | TSSOP-24 | I | $3.88 | Yes | ||
| LTC3862IGN#PBF | SSOP-24 | I | $5.30 | $3.71 | Yes | |
| LTC3862IGN#TRPBF | SSOP-24 | I | $3.77 | Yes | ||
| LTC3862IUH#PBF | 5x5 QFN-24 | I | $5.30 | $3.71 | Yes | |
| LTC3862IUH#TRPBF | 5x5 QFN-24 | I | $3.77 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1286A-A | LTC3862EGN Demo Board | 5V to 36VIN, 48VOUT @ 5A, Multiphase Boost Controller | $125.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3862HFE#PBF | TSSOP-24 | H | $5.89 | $4.12 | Yes | |
| LTC3862HFE#TRPBF | TSSOP-24 | H | $4.18 | Yes | ||
| LTC3862HGN#PBF | SSOP-24 | H | $5.71 | $4.00 | Yes | |
| LTC3862HGN#TRPBF | SSOP-24 | H | $4.06 | Yes | ||
| LTC3862HUH#PBF | 5x5 QFN-24 | H | $5.71 | $4.00 | Yes | |
| LTC3862HUH#TRPBF | 5x5 QFN-24 | H | $4.06 | Yes | ||
| LTC3862IFE#PBF | TSSOP-24 | I | $5.46 | $3.82 | Yes | |
| LTC3862IFE#TRPBF | TSSOP-24 | I | $3.88 | Yes | ||
| LTC3862IGN#PBF | SSOP-24 | I | $5.30 | $3.71 | Yes | |
| LTC3862IGN#TRPBF | SSOP-24 | I | $3.77 | Yes | ||
| LTC3862IUH#PBF | 5x5 QFN-24 | I | $5.30 | $3.71 | Yes | |
| LTC3862IUH#TRPBF | 5x5 QFN-24 | I | $3.77 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive, Telecom and Industrial Power Supplies
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice does not automatically open after clicking the link above, 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
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LTC3862
LTC3862-1
LTC3862-2
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
To open the project file for this circuit:
- Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
- Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
- Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu
Design tools for the following parts are available in LTpowerCAD:
LTC3862
LTC3862 Parallel
LTC3862-1
LTC3862-1 Parallel
LTC3862-2
LTC3862-2 Parallel
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
