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LT8705MPFE#PBF Datasheet(PDF) 1 Page - Linear Technology |
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LT8705MPFE#PBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 44 page  LT8705 1 8705fe For more information www.linear.com/LT8705 Typical applicaTion FeaTures DescripTion 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller The LT®8705 is a high performance buck-boost switch- ing 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. TheLT8705includesservopinstoindicatewhichfeedback loopsareactive.TheMODEpinselectsamongBurstMode® operation, discontinuous or continuous conduction mode at light loads. Additional features include a 3.3V/12mA LDO,asynchronizablefixedoperatingfrequency,onboard gate drivers, adjustable UVLO, along with input and output current monitoring with programmable maximum levels. applicaTions 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. n Single Inductor Allows VIN Above, Below, or Equal to Regulated VOUT n VIN Range 2.8V (Need EXTVCC > 6.4V) to 80V n VOUT Range: 1.3V to 80V n Quad N-Channel MOSFET Gate Drivers n Synchronous Rectification: Up to 98% Efficiency n Input and Output Current Monitor Pins n Synchronizable Fixed Frequency: 100kHz to 400kHz n Integrated Input Current, Input Voltage, Output Cur- rent and Output Voltage Feedback Loops n Clock Output Usable To Monitor Die Temperature n Available in 38-Lead (5mm × 7mm) QFN and TSSOP Packages with the TSSOP Modified for Improved High Voltage Operation n High Voltage Buck-Boost Converters n Input or Output Current Limited Converters Telecom Voltage Stabilizer 8705 TA01 CSPOUT CSNOUT EXTVCC FBOUT INTVCC GATEVCC SRVO_FBIN SRVO_FBOUT SRVO_IIN SRVO_IOUT IMON_IN IMON_OUT SYNC CLKOUT VC 56.2k 202kHz CSNIN TG1 BOOST1 0.22µF 0.22µF TO DIODE TO DIODE M2 M1 ×2 22µH 4.7µF ×4 M4 M3 ×2 1nF 1nF SW1 BG1 CSP CSN LT8705 GND BG2 SW2 BOOST2 VOUT 48V 5A VIN 36V TO 80V TG2 CSPIN VIN SHDN SWEN LDO33 MODE FBIN RT SS 3.3nF 220pF 215k 71.5k 20k 1µF 1µF 4.7µF 10k 392k 220µF ×2 4.7µF ×6 4 4.7µF TO BOOST1 4.7µF 2 ×2 2 ×2 10m + 220µF ×2 + TO BOOST2 100k 10 10 VIN (V) 30 90 95 70 8705 TA01b 85 80 0 40 50 60 80 VOUT = 48V ILOAD = 2A 100 6 5 4 3 2 1 Efficiency and Power Loss |
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