Integrated Circuits (ICs)

LT1108CS8-5#PBF

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Analog Devices

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

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Integrated Circuits (ICs)

LT1108CS8-5#PBF

Active

Analog Devices

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

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DocumentsDatasheet R177 Reliability Data

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LT1108CS8-5#PBF

Current - Output	1.5 A
Frequency - Switching	19 kHz
Function	Step-Down, Step-Up
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Configuration	Positive or Negative
Output Type	1.81 mOhm
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	Boost, Buck
Voltage - Input (Max) [Max]	30 V
Voltage - Input (Min) [Min]	2 V
Voltage - Output (Min/Fixed)	5 V

LT1108 Series

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

Part	Voltage - Input (Max) [Max]	Number of Outputs	Function	Output Type	Operating Temperature [Max]	Package / Case	Package / Case [y]	Package / Case [x]	Supplier Device Package	Topology	Frequency - Switching	Voltage - Input (Min) [Min]	Output Configuration	Voltage - Output (Min/Fixed)	Mounting Type	Current - Output	Package / Case	Package / Case
Analog Devices LT1108CS8-5#TRPBF	30 V	1	Step-Down Step-Up	1.81 mOhm	70 °C	8-SOIC	3.9 mm	0.154 in	8-SO	Boost Buck	19 kHz	2 V	Positive or Negative	5 V	Surface Mount	1.5 A
Analog Devices LT1108CS8-5#PBF	30 V	1	Step-Down Step-Up	1.81 mOhm	70 °C	8-SOIC	3.9 mm	0.154 in	8-SO	Boost Buck	19 kHz	2 V	Positive or Negative	5 V	Surface Mount	1.5 A
Analog Devices LT1108CN8-12#PBF	30 V	1	Step-Down Step-Up	1.81 mOhm	70 °C	8-DIP			8-PDIP	Boost Buck	19 kHz	2 V	Positive or Negative	12 V	Through Hole	1.5 A	0.3 in	7.62 mm
Analog Devices LT1108CS8-12#TRPBF	30 V	1	Step-Down Step-Up	1.81 mOhm	70 °C	8-SOIC	3.9 mm	0.154 in	8-SO	Boost Buck	19 kHz	2 V	Positive or Negative	12 V	Surface Mount	1.5 A
Analog Devices LT1108CN8-5#PBF	30 V	1	Step-Down Step-Up	1.81 mOhm	70 °C	8-DIP			8-PDIP	Boost Buck	19 kHz	2 V	Positive or Negative	5 V	Through Hole	1.5 A	0.3 in	7.62 mm

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	$ 11.55
		10	$ 8.10
		25	$ 7.21

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