Datasheet Linear Technology LT8705

Manufacturer	Linear Technology
Series	LT8705

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

Datasheets

Preview and Download

PDF, 508 Kb, Language: en, File uploaded: Sep 20, 2017, Pages: 44
80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller

Extract from the document

Prices

Packaging

	LT8705EFE#PBF	LT8705EFE#TRPBF	LT8705EUHF#PBF	LT8705EUHF#TRPBF	LT8705HFE#PBF	LT8705HFE#TRPBF	LT8705IFE#PBF	LT8705IFE#TRPBF	LT8705IUHF#PBF	LT8705IUHF#TRPBF	LT8705MPFE#PBF	LT8705MPFE#TRPBF
N	1	2	3	4	5	6	7	8	9	10	11	12
Package	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing
Package Code	FE	FE	UHF	UHF	FE	FE	FE	FE	UHF	UHF	FE	FE
Package Index	05-08-1865	05-08-1865	05-08-1701	05-08-1701	05-08-1865	05-08-1865	05-08-1865	05-08-1865	05-08-1701	05-08-1701	05-08-1865	05-08-1865
Pin Count	38	38	38	38	38	38	38	38	38	38	38	38

Parametrics

Parameters / Models	LT8705EFE#PBF	LT8705EFE#TRPBF	LT8705EUHF#PBF	LT8705EUHF#TRPBF	LT8705HFE#PBF	LT8705HFE#TRPBF	LT8705IFE#PBF	LT8705IFE#TRPBF	LT8705IUHF#PBF	LT8705IUHF#TRPBF	LT8705MPFE#PBF	LT8705MPFE#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A	DC1924A
Design Tools	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File
Export Control	no	no	no	no	no	no	no	no	no	no	no	no
Features	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase	Burst Mode, Resistor Set Frequency, External Synchronization, Input Current Regulation, Output Current Regulation, Input Current Monitor, Output Current Monitor, PolyPhase
Frequency, kHz	400	400	400	400	400	400	400	400	400	400	400	400
Frequency Adjust Range	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz
Frequency Sync Range	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz	100kHz - 400kHz
Integrated Inductor	no	no	no	no	no	no	no	no	no	no	no	no
Ishutdown, µA	1	1	1	1	1	1	1	1	1	1	1	1
Isupply, mA	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65
Monolithic	no	no	no	no	no	no	no	no	no	no	no	no
Number of Outputs	1	1	1	1	1	1	1	1	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85	-40 to 125	-40 to 125	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-55 to 125	-55 to 125
Output Current, A	10	10	10	10	10	10	10	10	10	10	10	10
Polyphase	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
Sense Resistor	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense	Rsense
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck	Buck-Boost, Buck
Vin Max, V	80	80	80	80	80	80	80	80	80	80	80	80
Vin Min, V	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8
Vout Max, V	80	80	80	80	80	80	80	80	80	80	80	80
Vout Maximum	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V
Vout Min, V	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3

Eco Plan

	LT8705EFE#PBF	LT8705EFE#TRPBF	LT8705EUHF#PBF	LT8705EUHF#TRPBF	LT8705HFE#PBF	LT8705HFE#TRPBF	LT8705IFE#PBF	LT8705IFE#TRPBF	LT8705IUHF#PBF	LT8705IUHF#TRPBF	LT8705MPFE#PBF	LT8705MPFE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Design Notes

Download
80V Synchronous 4-Switch Buck-Boost Controller Delivers Hundreds of Watts with 99% Efficiency &mdash DN521
PDF, 190 Kb, File published: Sep 30, 2013
Extract from the document
80V Synchronous 4-Switch Buck-Boost Controller Delivers
Hundreds of Watts with 99% Efficiency вЂ“ Design Note 521
Keith Szolusha and Tage Bjorklund Introduction
A DC/DC converterвЂ™s efficiency and component temperature are important considerations in high power applications where high current could overheat the catch
diode used in an asynchronous buck or boost topology.
Replacing the catch diode with a synchronous switch
can significantly improve overall converter efficiency
and eliminate much of the heat that would be otherwise
generated in the nonsynchronous catch diode.
The advantages offered by a synchronous buck or
boost topology can also be applied to a buck-boost
topology, where the converterвЂ™s output voltage falls
within its input range. In this case, a synchronous
4-switch buck-boost converter using a single inductor
offers the same advantages as a 2-switch synchronous
buck or boost.
L1
22ВµH M1 + CIN2
4.7ВµF
Г—4 CIN1
220ВµF
Г—2 M2 M4 TO
DIODE DB2 TG1 BOOST1 SW1 BG1 CSP 1nF 10О© 1nF 10О© …

Model Line

Series: LT8705 (12)

LT8705EFE#PBF LT8705EFE#TRPBF LT8705EUHF#PBF LT8705EUHF#TRPBF LT8705HFE#PBF LT8705HFE#TRPBF LT8705IFE#PBF LT8705IFE#TRPBF LT8705IUHF#PBF LT8705IUHF#TRPBF LT8705MPFE#PBF LT8705MPFE#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Buck-Boost Regulators > External Power Switch Buck-Boost
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators