LT1939IDD#TRPBF

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Analog Devices Inc./Maxim Integrated

MONOLITHIC 2A STEP-DOWN REGULATOR PLUS LINEAR REGULATOR/CONTROLLER

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LT1939IDD#TRPBF

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Analog Devices Inc./Maxim Integrated

MONOLITHIC 2A STEP-DOWN REGULATOR PLUS LINEAR REGULATOR/CONTROLLER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT1939 Series

The LT1939 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. The wide input range of 3V to 25V makes the LT1939 suitable for regulating power from a wide variety of sources, including automotive batteries, industrial supplies and unregulated wall adapters.Resistor-programmable 250kHz to 2.2MHz frequency range and synchronization capability enable optimization between efficiency and external component size. Cycle-by-cycle current limit, frequency foldback and thermal shutdown provide protection against a shorted output. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking.The LT1939 contains an internal NPN transistor with feedback control which can be conﬁgured as a linear regulator or as a linear regulator controller.The LT1939’s low current shutdown mode (<12μA) enables easy power management in battery-powered systems.ApplicationsAutomotive Battery RegulationIndustrial ControlWall Transformer RegulationDistributed Power Regulation

Technical Specifications

Parameters and characteristics for this part

Specification	LT1939IDD#TRPBF

Current - Output 1	2 A
Current - Output 2	1 A
Frequency - Switching (Max)	2.4 MHz
Frequency - Switching (Min)	500 kHz
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Package / Case	12-WFDFN Exposed Pad
Package Length	3 mm
Package Name	12-DFN
Package Width	3 mm
Topology	Step-Down (Buck) (1), Linear (LDO) (1)
Voltage - Output 1 (Max)	24.25 V
Voltage - Output 1 (Min)	800 mV
Voltage - Output 2 (Maximum)	24.25 V
Voltage - Output 2 (Minimum)	0.8 V
Voltage - Supply (Maximum)	25 V
Voltage - Supply (Minimum)	3 V
w/LED Driver	No
w/Sequencer	No
w/Supervisor	No

LT1939 Series

Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

Part	Mounting Type	Voltage - Output 2 (Minimum)	Current - Output 2	Voltage - Output 2 (Maximum)	Number of Outputs	w/Sequencer	Frequency - Switching (Max)	Frequency - Switching (Min)	Operating Temperature (Max)	Operating Temperature (Min)	Package / Case	Voltage - Supply (Maximum)	Voltage - Supply (Minimum)	Current - Output 1	Voltage - Output 1 (Min)	Voltage - Output 1 (Max)	Topology	Package Width	Package Name	Package Length	w/Supervisor	w/LED Driver
Analog Devices Inc./Maxim Integrated LT1939IDD#PBF	Surface Mount	0.8 V	1 A	24.25 V	2	No	2.4 MHz	500 kHz	125 °C	-40 °C	12-WFDFN Exposed Pad	25 V	3 V	2 A	800 mV	24.25 V	Linear (LDO) (1) Step-Down (Buck) (1)	3 mm	12-DFN	3 mm	No	No
Analog Devices Inc./Maxim Integrated LT1939IDD#TRPBF	Surface Mount	0.8 V	1 A	24.25 V	2	No	2.4 MHz	500 kHz	125 °C	-40 °C	12-WFDFN Exposed Pad	25 V	3 V	2 A	800 mV	24.25 V	Linear (LDO) (1) Step-Down (Buck) (1)	3 mm	12-DFN	3 mm	No	No
Analog Devices Inc./Maxim Integrated LT1939EDD#TRPBF	Surface Mount	0.8 V	1 A	24.25 V	2	No	2.4 MHz	500 kHz	125 °C	-40 °C	12-WFDFN Exposed Pad	25 V	3 V	2 A	800 mV	24.25 V	Linear (LDO) (1) Step-Down (Buck) (1)	3 mm	12-DFN	3 mm	No	No
Analog Devices Inc./Maxim Integrated LT1939EDD#PBF	Surface Mount	0.8 V	1 A	24.25 V	2	No	2.4 MHz	500 kHz	125 °C	-40 °C	12-WFDFN Exposed Pad	25 V	3 V	2 A	800 mV	24.25 V	Linear (LDO) (1) Step-Down (Buck) (1)	3 mm	12-DFN	3 mm	No	No
Analog Devices Inc./Maxim Integrated LT1939EDD	Surface Mount	0.8 V	1 A	24.25 V	2	No	2.4 MHz	500 kHz	125 °C	-40 °C	12-WFDFN Exposed Pad	25 V	3 V	2 A	800 mV	24.25 V	Linear (LDO) (1) Step-Down (Buck) (1)	3 mm	12-DFN	3 mm	No	No

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

Tape and Reel Packaging

LT1939IDD#TRPBF | Datasheet

R530 Reliability Data