LTC3779 - 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller

Features

  • 4-Switch Current Mode Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Wide VIN Range: 4.5V to 150V
  • Wide Output Voltage Range: 1.2V ≤ VOUT ≤ 150V
  • Synchronous Rectification: Up to 99% Efficiency
  • ±1% 1.2V Voltage Reference
  • Input or Output Average Current Limit
  • On-Board LDO or External NMOS LDO for DRVCC
  • 36V EXTVCC LDO Powers Drivers
  • Programmable 6V to 10V DRVCC Optimizes Efficiency
  • No Top FET Refresh Noise in Boost or Buck Mode
  • VOUT Disconnected from VIN During Shutdown
  • Phase-Lockable Fixed Frequency (50kHz to 600kHz)
  • No Reverse Current During Start-Up
  • Power Good Output Voltage Monitor
  • 150V Rated RUN Pin with Accurate Turn-On Threshold
  • Programmable Input Overvoltage Lockout
  • Thermally Enhanced FE38 TSSOP Package Modified for High Voltage Operation

Typical Application

LTC3779 Typical Application
LTC3779 Typical Application

Description

The LTC®3779 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phaselockable frequency of up to 600kHz, while an input/output constant current loop provides support for battery charging. 

With a wide 4.5V to 150V input and output range and seamless transfers between operating regions, the LTC3779 is ideal for automotive, telecom and batterypowered systems. 

The LTC3779 features a precision 1.2V reference and power good output indicator. The MODE pin can select between pulse-skipping mode or forced continuous mode of operation. Pulse-skipping mode offers high efficiency at light load while forced continuous mode operates at a constant frequency for noise sensitive applications. The PLLIN pin allows the IC to be synchronized to an external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

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
LTC3779EFE#PBF TSSOP-38 FE E 05-08-1865 Yes
LTC3779EFE#TRPBF TSSOP-38 FE E 05-08-1865 Yes
LTC3779HFE#PBF TSSOP-38 FE H 05-08-1865 Yes
LTC3779HFE#TRPBF TSSOP-38 FE H 05-08-1865 Yes
LTC3779IFE#PBF TSSOP-38 FE I 05-08-1865 Yes
LTC3779IFE#TRPBF TSSOP-38 FE I 05-08-1865 Yes


LTC3779 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
LTC3779EFE#PBF TSSOP-38 E $8.50 $5.95 Yes
LTC3779EFE#TRPBF TSSOP-38 E $8.56 $6.01 Yes
LTC3779HFE#PBF TSSOP-38 H $9.93 $6.95 Yes
LTC3779HFE#TRPBF TSSOP-38 H $9.99 $7.01 Yes
LTC3779IFE#PBF TSSOP-38 I $9.43 $6.60 Yes
LTC3779IFE#TRPBF TSSOP-38 I $9.49 $6.66 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
DC2456A LTC3779EFE Demo Board | 16V ≤ VIN ≤ 120V, VOUT = 48V @ 10A at up to 99% Efficiency Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Industrial, Automotive, Medical, Military, Avionics

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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

Models for the following parts are available in LTspice:
LTC3779

Technical Support