Integrated Circuits (ICs)

LT1172IS8#PBF

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Analog Devices

100KHZ, 5A, 2.5A AND 1.25A HIGH EFFICIENCY SWITCHING REGULATORS

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Integrated Circuits (ICs)

LT1172IS8#PBF

Active

Analog Devices

100KHZ, 5A, 2.5A AND 1.25A HIGH EFFICIENCY SWITCHING REGULATORS

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DocumentsDatasheet R012 Reliability Data

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LT1172IS8#PBF

Current - Output	1.25 A
Frequency - Switching	100 kHz
Function	Step-Up, Step-Up/Step-Down, Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	100 °C
Operating Temperature [Min]	-40 C
Output Configuration	Positive or Negative
Output Type	Adjustable
Package / Case	8-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Supplier Device Package	8-SO
Synchronous Rectifier	False
Topology	Flyback, Cuk, Boost, Forward Converter, Buck
Voltage - Input (Min) [Min]	3 V
Voltage - Output (Max)	65 V
Voltage - Output (Min/Fixed)	1.244 V

LT1172 Series

100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators

Part	Operating Temperature [Max]	Operating Temperature [Min]	Function	Number of Outputs	Output Type	Mounting Type	Frequency - Switching	Topology	Output Configuration	Current - Output	Supplier Device Package	Voltage - Input (Min) [Min]	Package / Case	Voltage - Output (Min/Fixed)	Voltage - Output (Max)	Voltage - Input (Max) [Max]	Package / Case	Package / Case	Package / Case [y]	Package / Case [x]
Analog Devices LT1172CQ#TRPBF	100 °C	0 °C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Surface Mount	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	DDPAK-5	3 V	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1.244 V	65 V
Analog Devices LT1172CK						Through Hole							TO-3-4
Analog Devices LT1172HVCT#06PBF	100 °C	0 °C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Through Hole	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	TO-220-5 Flow 6	3 V	TO-220-5	1.244 V	75 V	60 V
Analog Devices LT1172IN8#PBF	100 °C	-40 C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Through Hole	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	8-PDIP	3 V	8-DIP	1.244 V	65 V		0.3 in	7.62 mm
Analog Devices LT1172MJ8	125 ¯C	-55 °C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Through Hole	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	8-CERDIP	3 V	8-CDIP	1.244 V	65 V		0.3 in	7.62 mm
Analog Devices LT1172CT#PBF	100 °C	0 °C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Through Hole	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	TO-220-5	3 V	TO-220-5	1.244 V	65 V
Analog Devices LT1172MJ8#PBF	125 ¯C	-55 °C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Through Hole	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	8-CERDIP	3 V	8-CDIP	1.244 V	65 V		0.3 in	7.62 mm
Analog Devices LT1172IS8#PBF	100 °C	-40 C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Surface Mount	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	8-SO	3 V	8-SOIC	1.244 V	65 V				3.9 mm	0.154 in
Analog Devices LT1172HVIQ#PBF	100 °C	-40 C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Surface Mount	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	DDPAK-5	3 V	D2PAK (5 Leads + Tab) TO-263-6 TO-263BA	1.244 V	75 V	60 V
Analog Devices LT1172CT#31PBF	100 °C	0 °C	Step-Down Step-Up Step-Up/Step-Down	1	Adjustable	Through Hole	100 kHz	Boost Buck Cuk Flyback Forward Converter	Positive or Negative	1.25 A	TO-220-5 Flow 31	3 V	TO-220-5 Formed Leads	1.244 V	65 V

Pricing

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

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 13.70
		10	$ 9.71
		25	$ 8.69
		100	$ 7.54
		250	$ 6.99
		500	$ 6.65
		1000	$ 6.46

Description

General part information

LT1172 Series

TheLT1170/LT1171/LT1172are monolithic high power switching regulators. They can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and "Cuk." A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. Integration of all functions allows the LT1170/LT1171/LT1172 to be built in a standard 5-pin TO-3 or TO-220 power package as well as the 8-pin packages (LT1172). This makes them extremely easy to use and provides "bust proof" operation similar to that obtained with 3-pin linear regulators.The LT1170/LT1171/LT1172 operate with supply voltages from 3V to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no external power devices. By utilizing current-mode switching techniques, they provide excellent AC and DC load and line regulation.The LT1170/LT1171/LT1172 have many unique features not found even on the vastly more difficult to use low power control chips presently available. They use adaptive antisat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50μA typically for standby operation.ApplicationsLogic Supply 5V at 10A5V Logic to ±15V Op Amp SupplyBattery UpconverterPower Inverter (+ to –) or (– to +)Fully Floating Multiple OutputsUser NoteThis data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in developing new designs. This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in the higher frequency. A CAD design program called SwitcherCAD®is also available.