LT1108CS8-5#TRPBF

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Analog Devices Inc./Maxim Integrated

MICROPOWER DC/DC CONVERTER ADJUSTABLE AND FIXED 5V, 12V

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LT1108CS8-5#TRPBF

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Analog Devices Inc./Maxim Integrated

MICROPOWER DC/DC CONVERTER ADJUSTABLE AND FIXED 5V, 12V

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT1108 Series

The LT1108 is a versatile micropower DC/DC converter. The device requires only four external components to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2V to 12V in step-up mode and to 30V in step-down mode.The LT1108 functions equally well in step-up, step-down, or inverting applications.The LT1108 is pin-for-pin compatible with the LT1173, but has a duty cycle of 70%, resulting in increased outputcurrent in many applications. The LT1108 can deliver 150mA at 5V from a 2 AA cell input and 5V at 300mA from 9V in step-down mode. Quiescent current is just 110µA, making the LT1108 ideal for power conscious battery-operated systems.Switch current limit can be programmed with a single resistor.An auxiliary gain block can be configured as a low battery detector, linear post regulator, under voltage lock-out circuit, or error amplifier.ApplicationsPalmtop Computers3V to 5V, 5V to 12V Converters9V to 5V, 12V to 5V ConvertersLCD Bias GeneratorsPeripherals and Add-On CardsBattery Backup SuppliesCellular Telephones

Technical Specifications

Parameters and characteristics for this part

Specification	LT1108CS8-5#TRPBF

Current - Output	1.5 A
Frequency - Switching	19 kHz
Function	Step-Up, Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	70 °C
Operating Temperature (Min)	0 °C
Output Configuration	Positive or Negative, Positive, Negative
Output Type	Fixed
Package Length	0.154 in
Package Name	8-SO, 8-SOIC
Package Width	3.9 mm
Synchronous Rectifier	No
Topology	Buck, Boost
Voltage - Input (Max)	30 V p-p
Voltage - Input (Min)	2 V
Voltage - Output (Min/Fixed)	5 V

LT1108 Series

Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

Part	Synchronous Rectifier	Function	Package Name	Output Configuration	Output Type	Topology	Number of Outputs	Voltage - Input (Max)	Voltage - Input (Min)	Voltage - Output (Min/Fixed)	Frequency - Switching	Package Length	Package Width	Operating Temperature (Max)	Mounting Type	Current - Output	Voltage - Output (Max)
Analog Devices Inc./Maxim Integrated LT1108CS8-5#TRPBF	No	Step-Down Step-Up	8-SO 8-SOIC	Negative Positive Positive or Negative	Fixed	Boost Buck	1	30 V p-p	2 V	5 V	19 kHz	0.154 in	3.9 mm	70 °C	Surface Mount	1.5 A
Analog Devices Inc./Maxim Integrated LT1108CS8#PBF	No	Step-Down Step-Up	8-SO 8-SOIC	Negative Positive Positive or Negative	Adjustable	Boost Buck	1	30 V p-p	2 V	1.245 V	19 kHz	0.154 in	3.9 mm	70 °C	Surface Mount	1.5 A	50 V
Analog Devices Inc./Maxim Integrated LT1108CS8-5#PBF	No	Step-Down Step-Up	8-SO 8-SOIC	Negative Positive Positive or Negative	Fixed	Boost Buck	1	30 V p-p	2 V	5 V	19 kHz	0.154 in	3.9 mm	70 °C	Surface Mount	1.5 A
Analog Devices Inc./Maxim Integrated LT1108CS8#TRPBF	No	Step-Down Step-Up	8-SO 8-SOIC	Negative Positive Positive or Negative	Adjustable	Boost Buck	1	30 V p-p	2 V	1.245 V	19 kHz	0.154 in	3.9 mm	70 °C	Surface Mount	1.5 A	50 V
Analog Devices Inc./Maxim Integrated LT1108CN8-12#PBF	No	Step-Down Step-Up	8-DIP 8-PDIP	Negative Positive Positive or Negative	Fixed	Boost Buck	1	30 V p-p	2 V	12 V	19 kHz	0.3 in	7.62 mm	70 °C	Through Hole	1.5 A
Analog Devices Inc./Maxim Integrated LT1108CN8#PBF	No	Step-Down Step-Up	8-DIP 8-PDIP	Negative Positive Positive or Negative	Adjustable	Boost Buck	1	30 V p-p	2 V	1.245 V	19 kHz	0.3 in	7.62 mm	70 °C	Through Hole	1.5 A	50 V
Analog Devices Inc./Maxim Integrated LT1108CS8-12#TRPBF	No	Step-Down Step-Up	8-SO 8-SOIC	Negative Positive Positive or Negative	Fixed	Boost Buck	1	30 V p-p	2 V	12 V	19 kHz	0.154 in	3.9 mm	70 °C	Surface Mount	1.5 A
Analog Devices Inc./Maxim Integrated LT1108CN8-5#PBF	No	Step-Down Step-Up	8-DIP 8-PDIP	Negative Positive Positive or Negative	Fixed	Boost Buck	1	30 V p-p	2 V	5 V	19 kHz	0.3 in	7.62 mm	70 °C	Through Hole	1.5 A
Analog Devices Inc./Maxim Integrated LT1108CS8-12#PBF	No	Step-Down Step-Up	8-SO 8-SOIC	Negative Positive Positive or Negative	Fixed	Boost Buck	1	30 V p-p	2 V	12 V	19 kHz	0.154 in	3.9 mm	70 °C	Surface Mount	1.5 A

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

Tape and Reel Packaging

LT1108CS8-5#TRPBF | Datasheet

R177 Reliability Data