LT8616 - Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current

Features

  • Wide Input Voltage Range: 3.4V to 42V
  • 2.5A and 1.5A Buck Regulators with Separate Inputs
  • Fast Minimum Switch On-Time: 35ns
  • Ultralow Quiescent Current Burst Mode® Operation:
  • 6.5μA IQ Regulating 12VIN to 5VOUT and 3.3VOUT
  • Output Ripple < 15mV
  • 180° Out of Phase Switching
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Accurate 1V Enable Pin Thresholds
  • Internal Compensation
  • Output Soft-Start and Tracking
  • TSSOP Package: Output Stays at or Below Regulation Voltage During Adjacent Pin Short or When a Pin Is Left Floating
  • Thermally Enhanced 28-Lead TSSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT8616 Typical Application
LT8616 Typical Application

Description

The LT®8616 is a high efficiency, high speed, dual synchronous monolithic step-down switching regulator that consumes only 6.5μA of quiescent current with both channels enabled. Both channels contain all switches and necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while minimizing output ripple. A SYNC pin allows synchronization to an external clock. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The enable pins have accurate 1V thresholds and can be used to program undervoltage lockout. Capacitors on the TR/SS pins programs the output voltage ramp rate during startup while the PG pins signal when each output is within 10% of the programmed output voltage. The LT8616 is available in a TSSOP package for high reliability.

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
LT8616EFE#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT8616EFE#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT8616HFE#PBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT8616HFE#TRPBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT8616IFE#PBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT8616IFE#TRPBF TSSOP-28 FE I 05-08-1663 (EB) Yes


LT8616 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
LT8616EFE#PBF TSSOP-28 E $6.29 $4.40 Yes
LT8616EFE#TRPBF TSSOP-28 E $4.46 Yes
LT8616HFE#PBF TSSOP-28 H $7.27 $5.09 Yes
LT8616HFE#TRPBF TSSOP-28 H $5.15 Yes
LT8616IFE#PBF TSSOP-28 I $6.91 $4.84 Yes
LT8616IFE#TRPBF TSSOP-28 I $4.90 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
DC2169A LT8616EFE Demo Board | Dual Sync Buck, 4.1V ≤ VIN ≤ 42V, Vout1 = 5V @ 1.5A, Vout2 = 3.3V @ 2.5A $225.00
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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
LT8616HFE#PBF TSSOP-28 H $7.27 $5.09 Yes
LT8616HFE#TRPBF TSSOP-28 H $5.15 Yes
LT8616IFE#PBF TSSOP-28 I $6.91 $4.84 Yes
LT8616IFE#TRPBF TSSOP-28 I $4.90 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 and Industrial Supplies
  • General Purpose Step-Down

Product Notifications

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Design Tools

LTspiceIV

LTspice® IV 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 IV

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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 IV:
LT8616

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:
LT8616

Technical Support