Specification	LT8705HFE#TRPBF

Clock Sync	True
Control Features	Enable, Soft Start, Frequency Control
Frequency - Switching [Max]	400 kHz
Frequency - Switching [Min]	100 kHz
Function	Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature [Max]	150 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Phases	2
Output Type	Transistor Driver
Package / Case	0.173 ", 4.4 mm, 31 Leads
Package / Case	38-TFSOP, Exposed Pad
Supplier Device Package	38-TSSOP-EP
Synchronous Rectifier	True
Topology	Buck-Boost
Voltage - Supply (Vcc/Vdd) [Max]	80 V
Voltage - Supply (Vcc/Vdd) [Min]	2.8 V

LT8705 Series

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

Part	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Function	Output Type	Output Phases	Mounting Type	Control Features	Package / Case	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Topology	Supplier Device Package	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Package / Case
Analog Devices Inc./Maxim Integrated LT8705AIUHF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-WFQFN Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-QFN (5x7)	80 V	2.8 V
Analog Devices Inc./Maxim Integrated LT8705IUHF#TRPBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-WFQFN Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-QFN (5x7)	80 V	2.8 V
Analog Devices Inc./Maxim Integrated LT8705IFE#PBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-TFSOP Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-TSSOP-EP	80 V	2.8 V	0.173 " 4.4 mm 31 Leads
Analog Devices Inc./Maxim Integrated LT8705IUHF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-WFQFN Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-QFN (5x7)	80 V	2.8 V
Analog Devices Inc./Maxim Integrated LT8705HFE#TRPBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-TFSOP Exposed Pad	2	150 °C	-40 °C	Buck-Boost	38-TSSOP-EP	80 V	2.8 V	0.173 " 4.4 mm 31 Leads
Analog Devices Inc./Maxim Integrated LT8705MPFE#TRPBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-TFSOP Exposed Pad	2	150 °C	-55 °C	Buck-Boost	38-TSSOP-EP	80 V	2.8 V	0.173 " 4.4 mm 31 Leads
Analog Devices Inc./Maxim Integrated LT8705AEUHF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-WFQFN Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-QFN (5x7)	80 V	2.8 V
Analog Devices Inc./Maxim Integrated LT8705AIFE#PBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-TFSOP Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-TSSOP-EP	80 V	2.8 V	0.173 " 4.4 mm 31 Leads
Analog Devices Inc./Maxim Integrated LT8705EFE#PBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-TFSOP Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-TSSOP-EP	80 V	2.8 V	0.173 " 4.4 mm 31 Leads
Analog Devices Inc./Maxim Integrated LT8705EUHF#PBF	100 kHz	400 kHz	Positive	Step-Up/Step-Down	Transistor Driver	2	Surface Mount	Enable Frequency Control Soft Start	38-WFQFN Exposed Pad	2	125 °C	-40 C	Buck-Boost	38-QFN (5x7)	80 V	2.8 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$	Updated

Digikey	N/A	0	$ 10.14	1m+

Description

General part information

LT8705 Series

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

Documents

Technical documentation and resources

R530 Reliability Data

Reliability Data

LT8705HFE#TRPBF | Datasheet

Datasheet