LT8602 - 42V Quad Monolithic Synchronous Step-Down Regulator

Features

  • Flexible Power Supply System Providing Four Outputs with a Wide Input Range
  • Two High Voltage Synchronous Buck Regulators:
    3V to 42V Input Voltage Range
    Output Currents Up to 2.5A and 1.5A
    High Efficiency Up to 93%
  • Two Low Voltage Synchronous Buck Regulators:
    2.6V to 5.5V Input Voltage Range
    Output Currents Up to 1.8A and 94% Efficiency
  • Resistor Programmable and Synchronizable 250kHz to 2.2MHz Switching Frequency
  • Low Ripple Burst Mode® Operation:
    30μA IQ at 12VIN
    Output Ripple < 15mV
  • Programmable Power-On Reset
  • Power Good Indicators
  • 2-Phase Clock Reduces Input Current Ripple
  • Available in Thermally Enhanced 40-Lead QFN (6mm × 6mm) Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT8602 Typical Application
LT8602 Typical Application
LT8602 Typical Application

Description

The LT®8602 is a quad channel, current mode, monolithic buck switching regulator with a programmable power-on reset. All regulators are synchronized to a single oscillator with an adjustable frequency from 250kHz to 2.2MHz. The LT8602 can be configured for micropower Burst Mode operation or pulse-skipping operation at light load. Micropower operation results in quiescent current of 30μA with all four regulators operating in the application below.

The high voltage channels are synchronous buck regulators that operate from an input of 3V to 42V. The output currents are up to 1.5A (OUT1) and 2.5A (OUT2). The low voltage channels operate from an input of 2.6V to 5.5V. Internal synchronous power switches provide high efficiency with output currents up to 1.8A. The LT8602 uses a 2-phase clock with channels 1 and 3 operating 180° from channels 2 and 4 to reduce input ripple current on both HV and LV inputs. All channels have cycle-by-cycle current limit, providing protection against shorted outputs. Thermal shutdown provides additional protection.

The LT8602 is available in a 40-lead 6mm × 6mm QFN package.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT8602EUJ#PBF 6x6 QFN-40 UJ E 05-08-1728 Yes
LT8602EUJ#TRPBF 6x6 QFN-40 UJ E 05-08-1728 Yes
LT8602IUJ#PBF 6x6 QFN-40 UJ I 05-08-1728 Yes
LT8602IUJ#TRPBF 6x6 QFN-40 UJ I 05-08-1728 Yes


LT8602 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
LT8602EUJ#PBF 6x6 QFN-40 E $7.64 $5.35 Yes
LT8602EUJ#TRPBF 6x6 QFN-40 E $5.41 Yes
LT8602IUJ#PBF 6x6 QFN-40 I $8.42 $5.89 Yes
LT8602IUJ#TRPBF 6x6 QFN-40 I $5.95 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
DC1949A LT8602 Demo Board | Quad Sync Buck; 5.5V ≤ VIN ≤ 42V, Vout1/Vout2/Vout3/Vout4 = 5V/3.3V/ 1.8V/1.2V @ 1A $295.00
Buy Now
Click here to view our complete list of demo boards

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
LT8602IUJ#PBF 6x6 QFN-40 I $8.42 $5.89 Yes
LT8602IUJ#TRPBF 6x6 QFN-40 I $5.95 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 Systems
  • Distributed Supply Regulation
  • Industrial Controls and 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 IV:
LT8602

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:
LT8602HV
LT8602LV

Technical Support