LT8705A Series

80V VINand VOUTSynchronous 4-Switch Buck-Boost DC/DC Controller

Catalog

80V VINand VOUTSynchronous 4-Switch Buck-Boost DC/DC Controller

Part	Mounting Type	Function	Frequency - Switching [Max]	Frequency - Switching [Min]	Package / Case	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Output Phases	Control Features	Output Configuration	Topology	Output Type	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Package / Case [custom]	Package / Case	Package / Case [custom]
Analog Devices LT8705IUHF#TRPBF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-WFQFN Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 ¯C
Analog Devices LT8705IFE#PBF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-TFSOP Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 ¯C	38-TSSOP-EP	0.173 "	31 Leads	4.4 mm
Analog Devices LT8705IUHF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-WFQFN Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 °C
Analog Devices LT8705AEUHF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-WFQFN Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 °C
Analog Devices LT8705EFE#PBF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-TFSOP Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 ¯C	38-TSSOP-EP	0.173 "	31 Leads	4.4 mm
Analog Devices LT8705EUHF#PBF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-WFQFN Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 ¯C
Analog Devices LT8705IFE	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-TFSOP Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 °C	38-TSSOP-EP	0.173 "	31 Leads	4.4 mm
Analog Devices LT8705AEFE#TRPBF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-TFSOP Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 °C	38-TSSOP-EP	0.173 "	31 Leads	4.4 mm
Analog Devices LT8705AEUHF#TRPBF	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-WFQFN Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 °C
Analog Devices LT8705EFE	Surface Mount	Step-Up/Step-Down	400 kHz	100 kHz	38-TFSOP Exposed Pad	2	80 V	2.8 V	2	Enable Frequency Control Soft Start	Positive	Buck-Boost	Transistor Driver	-40 °C	125 °C	38-TSSOP-EP	0.173 "	31 Leads	4.4 mm

Catalog

80V VINand VOUTSynchronous 4-Switch Buck-Boost DC/DC Controller

Key Features

• Single Inductor Allows VINAbove, Below, or Equal to Regulated VOUT

• VINRange 2.8V (Need EXTVCC> 6.4V) to 80V

• VOUTRange: 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

Description

The LT8705A 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 LT8705A is compatible with most solar, automotive, telecom and battery-powered systems. The LT8705A is an improved pin compatible version of the LT8705 and is recommended for new designs. See LT8705A vs LT8705 in the Applications Information section for more information.The LT8705A includes a MODE pin to select 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, and onboard gate drivers.LT8705LT8705AImproved, pin-to-pin compatible version of LT8705. Recommended for all new designsApplicationsHigh Voltage Buck-Boost ConvertersInput or Output Current Limited Converters