LT1111 Series

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

Catalog

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

Part	Mounting Type	Voltage - Output (Max) [Max]	Topology	Supplier Device Package	Number of Outputs	Current - Output	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Min/Fixed)	Function	Frequency - Switching	Voltage - Input (Min) [Min]	Output Type	Package / Case	Package / Case [y]	Package / Case [x]	Output Configuration	Voltage - Input (Max) [Max]	Output Type	Package / Case	Package / Case
Analog Devices LT1111IS8#PBF	Surface Mount	50 V	Boost Buck	8-SO	1	1.5 A	105 °C	-40 °C	1.25 V	Step-Down Step-Up	72 kHz	2 V	Adjustable	8-SOIC	3.9 mm	0.154 in	Positive or Negative	30 V
Analog Devices LT1111CS8-5#PBF	Surface Mount		Boost Buck	8-SO	1	1.5 A	70 °C	0 °C	5 V	Step-Down Step-Up	72 kHz	2 V		8-SOIC	3.9 mm	0.154 in	Positive or Negative	30 V	1.81 mOhm
Analog Devices LT1111CS8-5#TRPBF	Surface Mount		Boost Buck	8-SO	1	1.5 A	70 °C	0 °C	5 V	Step-Down Step-Up	72 kHz	2 V		8-SOIC	3.9 mm	0.154 in	Positive or Negative	30 V	1.81 mOhm
Analog Devices LT1111CN8-12#PBF	Through Hole		Boost Buck	8-PDIP	1	1.5 A	70 °C	0 °C	12 V	Step-Down Step-Up	72 kHz	2 V		8-DIP			Positive or Negative	30 V	1.81 mOhm	0.3 in	7.62 mm
Analog Devices LT1111IS8	Surface Mount	50 V	Boost Buck	8-SO	1	1.5 A	105 °C	-40 °C	1.25 V	Step-Down Step-Up	72 kHz	2 V	Adjustable	8-SOIC	3.9 mm	0.154 in	Positive or Negative	30 V
Analog Devices LT1111CS8-12#PBF	Surface Mount		Boost Buck	8-SO	1	1.5 A	70 °C	0 °C	12 V	Step-Down Step-Up	72 kHz	2 V		8-SOIC	3.9 mm	0.154 in	Positive or Negative	30 V	1.81 mOhm

Catalog

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

Key Features

• Operates at Supply Voltages from 2V to 30V

• Works with Surface Mount Inductors

• 72kHz Oscillator

• Only Three External Components Required

• Step-Up or Step-Down Mode

• Low-Battery Detector Comparator On-Chip

• User Adjustable Current Limit

• Internal 1A Power Switch

• Fixed or Adjustable Output Voltage Versions

• Space Saving 8-Pin MiniDIP or SO-8 Package

Description

The LT1111 is a versatile micropower DC/DC converter. The device requires only three 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 LT1111 functions equally well in step-up, step-down, or inverting applications.The LT1111 oscillator is set at 72kHz, optimizing the device to work with off-the-shelf surface mount inductors. The device can deliver 5V at 100mA from a 3V input in step-up mode or 5V at 200mA from a 12V input in step-down mode.Switch current limit can be programmed with a single resistor. An auxiliary open-collector gain block can be configured as a low-battery detector, linear post regulator, undervoltage lock-out circuit, or error amplifier.For input sources of less than 2V use the LT1110.Applications3V to 5V, 5V to 12V Converters9V to 5V, 12V to 5V ConvertersRemote ControlsPeripherals and Add-On CardsBattery Backup SuppliesUninterruptible SuppliesLaptop and Palmtop ComputersCellular TelephonesPortable InstrumentsFlash Memory VPP Generators