LT1939EDD

Voltage/Current - Output 3:	--
Supplier Device Package:	12-DFN (3x3)
Package / Case:	12-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	3 V ~ 25 V
w/Sequencer:	No
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	0.8 V ~ 24.25 V, 1A
Voltage/Current - Output 1:	0.8 V ~ 24.25 V, 2A
Frequency - Switching:	500kHz ~ 2.4MHz
Number of Outputs:	2
Function:	Any Function
Topology:	Step-Down (Buck) (1), Linear (LDO) (1)
Part Status:	Obsolete

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IntroductionLT1939EDD - a high-performance, low-dropout linear regulator with 2A output current capability - is designed for applications that require high precision, low noise, and cost-effectiveness. Based on a monolithic architecture and employing a new advanced voltage regulator design, the LT1939EDD offers improved power efficiency and accuracy compared to other linear regulators. It features on-chip thermal protection, reverse current protection and ESD protection, making it a highly robust solution.Features and BenefitsThe LT1939EDD features several advanced features and benefits, allowing the device to deliver the maximum performance:• Low Dropout Voltage: The LT1939EDD offers a low dropout voltage (1.3V at 2A), allowing the device to efficiently regulate output voltages as low as 0.8V.• Low Noise: The LT1939EDD achieves excellent regulation accuracy, low noise and ripple rejection in comparison to other linear regulators.• On-Chip Thermal Monitoring and Protection: The device includes integrated thermal monitoring and protection, allowing it to prevent overloading and provide safeguarding against device damage in case of prolonged output current.• Reverse Current Protection and ESD Protection: The LT1939EDD is equipped with reverse current protection and ESD protection, allowing the device to protect itself from sudden power surges.• Low Cost: In comparison to other linear regulators, the LT1939EDD offers improved efficiency and cost savings due to its monolithic architecture.Application Fields and Working PrincipleThe LT1939EDD is designed for applications that require high performance and cost-effectiveness, such as portable products, desktop computers, servers, routers, and wired communications.The LT1939EDD works on the principle of linear voltage regulation, wherein the output voltage is regulated with respect to a reference voltage by controlling the amount of current flowing between the input and output pins. This current is determined by the voltage across the control I/O resistor. The device senses the voltage at the output of the regulator and adjusts the current accordingly, thus achieving a constant regulated output voltage.The LT1939EDD offers a variety of features, including adjustable output voltage, low noise operation, reverse-current protection, extended battery life, and thermal protection, as well as superior efficiency and over-temperature protection for longterm reliability. It offers excellent load transient response and energy efficiency, allowing the device to provide reliable, accurate and clean output power despite changing input and output voltages.In addition, the LT1939EDD is a switching regulator and can be used to generate a variety of output voltages with a minimal component count. The switching regulator is a DC-DC converter which uses transistor switches to convert and control electrical energy, while the linear regulator is a voltage regulator which passes current through a regulation circuit to regulate a voltage. The LT1939EDD is thus capable of switching multiple output voltages while providing an adjustable and extremely low noise output.ConclusionThe LT1939EDD is a high-performance, low-dropout linear regulator designed for applications that require accurate, low-noise, cost-effective power conversion. It features on-chip thermal monitoring and protection, reverse-current protection and ESD protection, making it a highly robust, reliable and efficient solution. Its combination of features make it suitable for a variety of applications, including portable products, desktop computers, servers, routers, and wired communications. In terms of performance, the LT1939EDD offers excellent load transient response and energy efficiency, allowing the device to provide reliable, accurate and clean output power despite changing input and output voltages.

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