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
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC3862 Typical Application
LTC3862 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 NumberVin RangeINTVccUV+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


LTC3862 Package Drawing
LTC3862 Package Drawing
LTC3862 Package Drawing

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 NowRequest Samples
* 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 Linear Technology sales office or authorized distributor.

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
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data 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 NowRequest Samples
* 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 Linear Technology sales office or authorized distributor.

Applications

  • Automotive, Telecom and Industrial Power Supplies

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

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:

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:

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