LTC7801 - 150V Low IQ, Synchronous Step-Down DC/DC Controller


  • Wide VIN Range: 4V to 140V (150V Abs Max)
  • Wide Output Voltage Range: 0.8V to 60V
  • Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE)
  • Low Operating IQ: 40μA (Shutdown = 10μA)
  • 100% Duty Cycle Operation
  • No External Bootstrap Diode Required
  • Selectable Gate Drive UVLO Thresholds
  • Onboard LDO or External NMOS LDO for DRVCC
  • EXTVCC LDO Powers Drivers from VOUT
  • Phase-Lockable Frequency (75kHz to 850kHz)
  • Programmable Fixed Frequency (50kHz to 900kHz)
  • Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
  • Adjustable Burst Clamp
  • Power Good Output Voltage Monitor
  • Programmable Input Overvoltage Lockout
  • Small 24-Lead 4mm × 5mm QFN or TSSOP Packages

Typical Application

LTC7801 Typical Application
LTC7801 Typical Application


The LTC®7801 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz.

The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. An internal charge pump allows for 100% duty cycle operation.

The low 40μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7801 features a precision 0.8V reference and power good output indicator. The output voltage can be programmed between 0.8V to 60V using external resistors.


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

Part Number Package Code Temp Package
LTC7801EFE#PBF TSSOP-24 FE E 05-08-1771 Yes
LTC7801EFE#TRPBF TSSOP-24 FE E 05-08-1771 Yes
LTC7801EUFD#PBF 4x5 QFN-24 UFD E 05-08-1696 Yes
LTC7801EUFD#TRPBF 4x5 QFN-24 UFD E 05-08-1696 Yes
LTC7801HFE#PBF TSSOP-24 FE H 05-08-1771 Yes
LTC7801HFE#TRPBF TSSOP-24 FE H 05-08-1771 Yes
LTC7801HUFD#PBF 4x5 QFN-24 UFD H 05-08-1696 Yes
LTC7801HUFD#TRPBF 4x5 QFN-24 UFD H 05-08-1696 Yes
LTC7801IFE#PBF TSSOP-24 FE I 05-08-1771 Yes
LTC7801IFE#TRPBF TSSOP-24 FE I 05-08-1771 Yes
LTC7801IUFD#PBF 4x5 QFN-24 UFD I 05-08-1696 Yes
LTC7801IUFD#TRPBF 4x5 QFN-24 UFD I 05-08-1696 Yes

LTC7801 Package Drawing
LTC7801 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
LTC7801EFE#PBF TSSOP-24 E $6.29 $4.40 Yes
LTC7801EFE#TRPBF TSSOP-24 E $6.35 $4.46 Yes
LTC7801EUFD#PBF 4x5 QFN-24 E $6.00 $4.20 Yes
LTC7801EUFD#TRPBF 4x5 QFN-24 E $6.06 $4.26 Yes
LTC7801HFE#PBF TSSOP-24 H $7.64 $5.35 Yes
LTC7801HFE#TRPBF TSSOP-24 H $7.70 $5.41 Yes
LTC7801HUFD#PBF 4x5 QFN-24 H $7.36 $5.15 Yes
LTC7801HUFD#TRPBF 4x5 QFN-24 H $7.42 $5.21 Yes
LTC7801IFE#PBF TSSOP-24 I $7.07 $4.95 Yes
LTC7801IFE#TRPBF TSSOP-24 I $7.13 $5.01 Yes
LTC7801IUFD#PBF 4x5 QFN-24 I $6.86 $4.80 Yes
LTC7801IUFD#TRPBF 4x5 QFN-24 I $6.92 $4.86 Yes
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* 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
DC2641A LTC7801EUFD Demo Board | Sync Buck Controller, 16V ≤ VIN ≤ 100V, VOUT = 12V @ 10A $225.00
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Click here to view our complete list of demo boards


  • Automotive and Industrial Power Systems
  • High Voltage Battery Operated Systems
  • Telecommunications Power Systems

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Design Tools


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

Models for the following parts are available in LTspice:


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:
LTC7801 Parallel

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