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LT8705

Linear Technology
Part Number LT8705
Manufacturer Linear Technology
Description Synchronous 4-Switch Buck-Boost DC/DC Controller
Published Jul 21, 2013
Detailed Description LT8705 80V VIN and VOUT Synchronous 4-Switch BuckBoost DC/DC Controller Features nn Single Inductor Allows VIN Above, B...
Datasheet PDF File LT8705 PDF File

LT8705
LT8705

Overview
LT8705 80V VIN and VOUT Synchronous 4-Switch BuckBoost DC/DC Controller Features nn Single Inductor Allows VIN Above, Below, or Equal to Regulated VOUT nn VIN Range 2.
8V (Need EXTVCC > 6.
4V) to 80V nn VOUT Range: 1.
3V to 80V nn Quad N-Channel MOSFET Gate Drivers nn Synchronous Rectification: Up to 98% Efficiency nn Input and Output Current Monitor Pins nn Synchronizable Fixed Frequency: 100kHz to 400kHz nn Integrated Input Current, Input Voltage, Output Cur- rent and Output Voltage Feedback Loops nn Clock Output Usable To Monitor Die Temperature nn Available in 38-Lead (5mm × 7mm) QFN and TSSOP Packages with the TSSOP Modified for Improved High Voltage Operation Applications nn High Voltage Buck-Boost Converters nn Input or Output Current Limited Converters Description The LT®8705 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.
L, LT, LTC, LTM, Linear Technology, Burst Mode, µModule and the Linear logo are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
POWER LOSS (W) Typical Application Telecom Voltage Stabilizer VIN 36V TO 80V 1µF + 220µF ×2 M1 ×2 4.
7µF ×4 TO DIODE 0.
22µF 2Ω ×2 22µH M2 M3 ×2 1nF 10Ω 10mΩ 1nF 10Ω 2Ω ×2 M4 TO DIODE 0.
22µF TG1 ...


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