LM25574BLDT

Series:	SIMPLE SWITCHER®, WEBENCH®
Part Status:	Active
Main Purpose:	DC/DC, Step Down
Outputs and Type:	1, Non-Isolated
Voltage - Output:	1.23 V ~ 40 V
Current - Output:	500mA
Voltage - Input:	6 V ~ 42 V
Regulator Topology:	Buck
Frequency - Switching:	--
Board Type:	Partially Populated - Main IC Only
Supplied Contents:	Board(s)
Utilized IC / Part:	LM25574

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<p>The LM25574BLDT is a high performance, multi-mode, non-synchronous buck switching regulator designed for consumer, computer, and communications applications. It combines a PWM controller, MOSFETs, and an oscillator in a single package, allowing designers to create high-efficiency power supplies with very few external components. It features a low quiescent current, a wide input voltage range, a programmable soft-start, and adjustable current limiting.</p><p>The LM25574BLDT is part of a family of similar devices, all of which are evaluated boards for DC/DC and AC/DC (off-line) SMPS (switched mode power supplies). It is primarily intended for applications such as general and wide-range DC-to-DC electrical systems, including automotive, commercial, home appliance, and industrial systems.</p><p>The working principle of the LM25574BLDT is based on the operation of a buck regulator, which is a type of switching power supply that uses high-frequency switching techniques to efficiently convert an input voltage to an output voltage of lower magnitude. It works by controlling the on and off times of an electronic switch to achieve a desired output voltage. The switch is typically a MOSFET, but may also be a BJT (Bipolar Junction Transistor) or an IGBT (Insulated-gate Bipolar Transistor).</p><p>The LM25574BLDT includes an internal programmable current-limit and soft-start circuitry. This ensures that the regulator does not exceed its specified current limit and provides a smooth startup. A wide-range of operating modes are available, including continuous PWM, automatic pwm/pfm switching, and auto-sleep and auto-restart modes. Additional features include an adjustable frequency and a Shutdown pin for precise control of the switching frequency.</p><p>The LM25574BLDT is matched with external MOSFETs, allowing designers to create a very high efficiency power supply. It also has built-in protection against over-voltage conditions and is a low-noise solution for many applications.</p><p>In conclusion, the LM25574BLDT is a highly efficient multi-mode switching regulator designed for consumer, computer, and communications applications. It is evaluated boards for DC/DC and AC/DC (off-line) SMPS and features a wide input voltage range, programmable current-limit and soft-start circuitry, adjustable frequency, and built-in protection against over-voltage conditions.</p>

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