LTC7813 - Low IQ, 60V Synchronous Boost+Buck Controller

Features

  • Synchronous Boost and Buck Controllers
  • When Cascaded, Allows VIN Above, Below, or Equal to Regulated VOUT of Up to 60V
  • Wide Bias Input Voltage Range: 4.5V to 60V
  • Output Remains in Regulation Through Input Dips (e.g. Cold Crank) Down to 2.2V
  • Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
  • Low EMI with Low Input and Output Ripple
  • Fast Output Transient Response
  • No External Bootstrap Diodes Required
  • High Light Load Efficiency
  • Low Operating IQ: 29μA (One Channel On)
  • Low Operating IQ: 34μA (Both Channels On)
  • RSENSE or Lossless DCR Current Sensing
  • Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 60V
  • Boost Output Voltage Up 60V
  • Phase-Lockable Frequency (75kHz to 850kHz)
  • Small 32-Pin 5mm × 5mm QFN Package

Typical Application

LTC7813 Typical Application

Description

The LTC®7813 is a high performance synchronous Boost+Buck DC/DC switching regulator controller that drives all N-channel power MOSFET stages. It contains independent step-up (boost) and step-down (buck) controllers that can regulate two separate outputs or be cascaded to regulate an output voltage from an input voltage that can be above, below, or equal to the output voltage. The LTC7813 operates from a wide 4.5V to 60V input supply range. When biased from the output of the boost regulator, the LTC7813 can operate from an input supply as low as 2.2V after start-up. The 34μA no-load quiescent current (both channels on) extends operating runtime in battery-powered systems.

Unlike conventional buck-boost regulators, the LTC7813’s cascaded Boost+Buck solution has continuous, nonpulsating, input and output currents, substantially reducing voltage ripple and EMI. The LTC7813 has independent feedback and compensation points for the boost and buck regulation loops, enabling a fast output transient response that can be externally optimized.

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
LTC7813EUH#PBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC7813EUH#TRPBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC7813HUH#PBF 5x5 QFN-32 UH H 05-08-1693 Yes
LTC7813HUH#TRPBF 5x5 QFN-32 UH H 05-08-1693 Yes
LTC7813IUH#PBF 5x5 QFN-32 UH I 05-08-1693 Yes
LTC7813IUH#TRPBF 5x5 QFN-32 UH I 05-08-1693 Yes
LTC7813MPUH#PBF 5x5 QFN-32 UH MP 05-08-1693 Yes
LTC7813MPUH#TRPBF 5x5 QFN-32 UH MP 05-08-1693 Yes


LTC7813 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
LTC7813EUH#PBF 5x5 QFN-32 E $6.89 $4.82 Yes
LTC7813EUH#TRPBF 5x5 QFN-32 E $6.95 $4.88 Yes
LTC7813HUH#PBF 5x5 QFN-32 H $8.31 $5.82 Yes
LTC7813HUH#TRPBF 5x5 QFN-32 H $8.37 $5.88 Yes
LTC7813IUH#PBF 5x5 QFN-32 I $7.90 $5.53 Yes
LTC7813IUH#TRPBF 5x5 QFN-32 I $7.96 $5.59 Yes
LTC7813MPUH#PBF 5x5 QFN-32 MP $21.34 $14.94 Yes
LTC7813MPUH#TRPBF 5x5 QFN-32 MP $21.40 $15.00 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
DC2435A-A LTC7813EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 56V; VOUT1 = 24V @ 5A Contact Factory
DC2435A-B LTC7813EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 56V; VOUT1 (Quasi Regulated) = 19V-28.6V @ 5A Contact Factory
DC2435A-C LTC7813EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 56V; Dual Output, VBoost = 24V @ 3A, Vbuck = 5V @ 8A Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

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

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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:
LTC7813

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

Design tools for the following parts are available in LTpowerCAD:
LTC7813(Boost)
LTC7813(Buck)

Technical Support