LT1945 Series

Dual Micropower DC/DC Converter with Positive and Negative Outputs

Catalog

Dual Micropower DC/DC Converter with Positive and Negative Outputs

Part	Current - Output	Number of Outputs	Voltage - Output (Min/Fixed)	Topology	Mounting Type	Output Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Voltage - Input (Max) [Max]	Package / Case	Package / Case [x]	Package / Case [x]	Voltage - Input (Min) [Min]	Supplier Device Package	Function	Voltage - Output (Max)
Analog Devices LT1945EMS#PBF	250 mA	2	1.23 V	Boost SEPIC	Surface Mount	Positive and Negative (Dual Rail)	70 °C	0 °C	Adjustable	15 V	10-MSOP 10-TFSOP	3 mm	0.118 in	1.2 V	10-MSOP	Step-Up Step-Up/Step-Down	34 V
Analog Devices LT1945EMS#TRPBF	250 mA	2	1.23 V	Boost SEPIC	Surface Mount	Positive and Negative (Dual Rail)	70 °C	0 °C	Adjustable	15 V	10-MSOP 10-TFSOP	3 mm	0.118 in	1.2 V	10-MSOP	Step-Up Step-Up/Step-Down	34 V
Analog Devices LT1945IMS#TRPBF	250 mA	2	1.23 V	Boost SEPIC	Surface Mount	Positive and Negative (Dual Rail)	85 °C	-40 °C	Adjustable	15 V	10-MSOP 10-TFSOP	3 mm	0.118 in	1.2 V	10-MSOP	Step-Up Step-Up/Step-Down	34 V

Catalog

Dual Micropower DC/DC Converter with Positive and Negative Outputs

Key Features

• Generates Well-Regulated Positive and Negative Outputs

• Low Quiescent Current:20µA in Active Mode (per Converter)<1µA in Shutdown Mode

• 20µA in Active Mode (per Converter)

• <1µA in Shutdown Mode

• Operates with VINas Low as 1.2V

• Low VCESATSwitch: 250mV at 300mA

• Uses Small Surface Mount Components

• High Output Voltage: Up to ±34V

• Tiny 10-Pin MSOP Package

Description

The LT1945 is a dual micropower DC/DC converter in a 10-pin MSOP package. Each converter is designed with a 350mA current limit and an input voltage range of 1.2V to 15V, making the LT1945 ideal for a wide variety of applications. Both converters feature a quiescent current of only 20µA at no load, which further reduces to 0.5µA in shutdown. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. The 36V switch allows high voltage outputs up to ±34V to be easily generated without the use of costly transformers. The LT1945’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications.ApplicationsSmall TFT LCD PanelsHandheld ComputersBattery BackupDigital Cameras