LT8705
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LT8705

80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller

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LTspice LT8705 Demo Circuit - Bi-Directional Buck-Boost Supercapacitor Backup Supply (36-80V to 15Vcap @ 1A) Download 10.00KB LTspice LT8705 Demo Circuit - Telecom Voltage Stabilizer (36-80V to 48V @ 5A) Download 8.59 KB LTspice LT8705 - Buck-Boost Regulators Download 8.12 KB
Part Models 12
1ku List Price Starting From $7.07
Features
  • Single Inductor Allows VIN Above, Below, or Equal to Regulated VOUT
  • VIN Range 2.8V (Need EXTVCC > 6.4V) to 80V
  • VOUT Range: 1.3V to 80V
  • Quad N-Channel MOSFET Gate Drivers
  • Synchronous Rectification: Up to 98% Efficiency
  • Input and Output Current Monitor Pins
  • Synchronizable Fixed Frequency: 100kHz to 400kHz
  • Integrated Input Current, Input Voltage, Output and Output Voltage Feedback Loops
  • Clock Output Usable To Monitor Die Temperature
  • Available in 38-Lead (5mm × 7mm) QFN and TSSOP Packages with the TSSOP Modified for Improve Voltage Operation
Additional Details
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The LT8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The part has integrated input current, input voltage, output current and output voltage feedback loops. With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705 is compatible with most solar, automotive, telecom and battery-powered systems.

The LT8705 includes servo pins to indicate which feedback loops are active. The MODE pin selects among Burst Mode® operation, discontinuous or continuous conduction mode at light loads. Additional features include a 3.3V/12mA LDO, a synchronizable fixed operating frequency, onboard gate drivers, adjustable UVLO, along with input and output current monitoring with programmable maximum levels.

LT8705
LT8705A Improved, pin-to-pin compatible version of LT8705. Recommended for all new designs


Applications

  • High Voltage Buck-Boost Converters
  • Input or Output Current Limited Converters

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file View Data Sheet
Documentation View All Documentation
LTspice LT8705 Demo Circuit - Bi-Directional Buck-Boost Supercapacitor Backup Supply (36-80V to 15Vcap @ 1A) Download 10.00KB LTspice LT8705 Demo Circuit - Telecom Voltage Stabilizer (36-80V to 48V @ 5A) Download 8.59 KB LTspice LT8705 - Buck-Boost Regulators Download 8.12 KB
Part Models 12
1ku List Price Starting From $7.07
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LT8705

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Data Sheet

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UPDATED 09/30/2015
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LT8705: 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller Data Sheet

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UPDATED 05/19/2015
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LT8705: 入力電圧および出力電圧が80Vの同期整流式4スイッチ昇降圧DC/DCコントローラ データシート

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Design Note

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UPDATED 09/30/2013
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DN521 - 80V Synchronous 4-Switch Buck-Boost Controller Delivers Hundreds of Watts with 99% Efficiency redirect icon

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UPDATED 11/18/2013
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DN521 - 80V 同步四开关降压-升压型控制器能以 99% 效率提供几百瓦功率 redirect icon

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UPDATED 12/12/2013
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DN521 - 99% の効率で数百ワットを供給可能な80V 同期整流式 4 スイッチ昇降圧コントローラ redirect icon

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User Guide

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UPDATED 07/11/2014
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DC1924A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/26/2018
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R530 Reliability Data redirect icon

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Application Note

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UPDATED 09/01/2019
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AN-140: リニア・レギュレータとスイッチング電源の基本概念 redirect icon

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UPDATED 09/01/2019
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AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies redirect icon

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UPDATED 09/01/2019
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AN-140：线性调节器和开关模式电源的基本概念 redirect icon

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Documentation

Technical Documents 5
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Solutions Bulletin & Brochure 1

LT8705 - 80V Sync Buck-Boost

Product Selector Card 1

80V to 150V Non-Isolated DC/DC

Video

2

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Video

2017-09-18

80V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC with 4 Regulation Loops

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2017-09-18

LT8705 Video Product Brief

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8705EFE#PBF 38-Lead TSSOP w/ EP external-link
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LT8705EFE#TRPBF 38-Lead TSSOP w/ EP external-link
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LT8705EUHF#PBF 38-Lead QFN (5mm x 7mm w/ EP) external-link
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LT8705EUHF#TRPBF 38-Lead QFN (5mm x 7mm w/ EP) external-link
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LT8705HFE#PBF 38-Lead TSSOP w/ EP external-link
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LT8705HFE#TRPBF 38-Lead TSSOP w/ EP external-link
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LT8705IFE#PBF 38-Lead TSSOP w/ EP external-link
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LT8705IFE#TRPBF 38-Lead TSSOP w/ EP external-link
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LT8705IUHF#PBF 38-Lead QFN (5mm x 7mm w/ EP) external-link
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LT8705IUHF#TRPBF 38-Lead QFN (5mm x 7mm w/ EP) external-link
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LT8705MPFE#PBF 38-Lead TSSOP w/ EP external-link
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LT8705MPFE#TRPBF 38-Lead TSSOP w/ EP external-link
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Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT8705EFE#PBF

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT8705EFE#PBF

PRODUCTION

LT8705EFE#TRPBF

PRODUCTION

LT8705HFE#PBF

PRODUCTION

LT8705HFE#TRPBF

PRODUCTION

LT8705IFE#PBF

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LT8705IFE#TRPBF

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LT8705MPFE#PBF

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LT8705MPFE#TRPBF

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Delta Qualification Matrix

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Software & Part Ecosystem

Parts Product Life Cycle Description

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LT8705A
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RECOMMENDED FOR NEW DESIGNS

80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller

Evaluation Kits 1

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DC1924A

LT8705EUHF Demo Board | 36V ≤ VIN ≤ 80V; VOUT = 48V @ 5A

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DC1924A

LT8705EUHF Demo Board | 36V ≤ VIN ≤ 80V; VOUT = 48V @ 5A

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DC1924A
LT8705EUHF Demo Board | 36V ≤ VIN ≤ 80V; VOUT = 48V @ 5A
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Product Detail

Demonstration circuit 1924A is a high performance buckboost converter featuring the LT8705 that can operate from input voltages above, below or equal to the output voltage. The demo board input range is 36V to 80V. The output is optimized for 48V at 5A, with the output current limit set at 7A. (The circuit will operate with lower input voltage than 36V if load current is reduced).

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DC1924A - Design Files Download

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DC1924A - Demo Manual Download

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DC1924A - Schematic Download

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Evaluation Kits1

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DC1924A

LT8705EUHF Demo Board | 36V ≤ VIN ≤ 80V; VOUT = 48V @ 5A

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, 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.

spice tool Lt Spice

LT8705 Demo Circuit - Bi-Directional Buck-Boost Supercapacitor Backup Supply (36-80V to 15Vcap @ 1A) Download

10.00K

spice tool Lt Spice

LT8705 Demo Circuit - Telecom Voltage Stabilizer (36-80V to 48V @ 5A) Download

8.59 K

spice tool Lt Spice

LT8705 - Buck-Boost Regulators Download

8.12 K

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