LM25574MTX Integrated Circuits (ICs)

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LM25574MTX Application Field and Working Principle

The LM25574MTX is a two-piece switching regulator from Texas Instruments that offers both wide input voltage range (4.5V-40V) and programmable frequency range from 400KHz to 2.6MHz. This device is an ideal choice for portable, isolated and battery operated industrial applications. It is capable of regulating both step up, boost and step down, buck applications.

Applications

• Battery-powered Industrial or portable applications
• Automotive or factory automation applications
• High power / efficiency DC/DC converter or voltage-controlled power supplies
• Positive and negative dc/dc converters
• Telecommunication systems

Key Features

• Wide input voltage range (4.5V to 40V)
• Programmable frequency range (400KHz to 2.6MHz)
• Power Good output
• Selectable PWM or PFM mode
• Diodeless operation with short circuit protection
• Low quiescent current (typical 1mA)
• High regulation accuracy (typical 1.5 %)
• High transient response
• Very low ground current (150uA)

Working Principle

The LM25574MTX is a two-stage synchronous switching regulator that uses a pair of transistors to convert the input DC voltage to a stepped voltage at the output. In the first stage, the power is switched from the input voltage to a higher voltage proportional to the output voltage setpoint. This stage is accomplished by clamping the feedback voltage at a certain level above the input voltage. The power is then alternatively switched between a lower voltage and the higher voltage in the second stage. This second stage is a “flyback” stage where the power is delivered to the output through a center tapped transformer in response to the duty cycles set by the PWM or PFM control signal.

The control circuit provides overcurrent, open loop and other protections while regulating the output voltage with a high accuracy. It is capable of operating over both wide input voltage and output voltage range. The output capacitor is connected on the secondary side, which eliminates the need for an output diode.

Conclusion

With its wide input voltage and programmable frequency range, the LM25574MTX is an ideal choice for battery powered, high power and efficient voltage controlled power supplies. It is also capable of operating over both wide input voltage and output voltage range with a high accuracy. The device’s protection circuit provides safety during operation and it has a low quiescent current for battery powered applications.

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