LT8705A

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet Product Selection Table
Part Models
12
1ku List Price
Starting From $7.07
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Part Details

  • 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 Current and Output Voltage Feedback Loops
  • Improved Light Load Transition from DCM to FCM
  • Improved IMON_OUT, IMON_IN Offset When Cold
  • Clock Output Usable To Monitor Die Temperature
LT8705A
80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller
Telecom Voltage Stabilizer Efficiency and Power Loss Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
High Voltage Hot Swap Controllers 1
LTC4380
RECOMMENDED FOR NEW DESIGNS Low Quiescent Current Surge Stopper
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LT8705
  • LT8705A

LTpowerCAD 1

LTspice

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC2285A

LT8705AEUHF Demo Board | VIN = 36V to 75V, VOUT = 48V @ 18A

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Product Details

Demonstration circuit 2285A features two high power high performance buck-boost LT8705A converters operating in master-slave configuration. The circuit can operate with input voltages above, below or equal to the output voltage. The demo board input range is 36V to 75V. The output is optimized for 48V at 18A, with the output current limit set at 20A. The circuit will operate with lower input voltage than 36V if load current is reduced.
DC2285A
LT8705AEUHF Demo Board | VIN = 36V to 75V, VOUT = 48V @ 18A
DC2285A

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