LT3976EUDD#PBF

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LT3976EUDD#PBF Application Field and Working Principle

The LT3976EUDD#PBF is a high performance, low voltage, step-down switching regulator featuring a high efficiency design with excellent line and load regulation.

Product Features and Specifications

The LT3976EUDD#PBF is designed to boost and regulate the output voltage up to 4.6 volts. It can operate from input voltages as high as 18V, while maintaining excellent line and load regulation. Output currentsense amplifiers provide adjustable soft-start and input current limit protection. The built-in linear regulator ensures a stable output voltage. The LT3976EUDD#PBF is available in different packages, such as 10-pin DIP, 14-pin SOIC, and 20-pin TSSOP.

• Input voltage range: 2.0V to 18V
• Output voltage range: up to 4.6V
• Output current: Up to 3A
• Programmable soft-start
• Programmable input current limit
• High efficiency: 90%
• High accuracy: ±2%
• High-impedance outputs for fast transient response

Applications

The LT3976EUDD#PBF is ideal for applications that require precise, high-accuracy, low-voltage regulation. Typical applications include Point-of-Load (PoL) power supplies, battery-powered equipment, notebook and laptop computer supplies, automotive systems, telecommunications, and general industrial electronics.

Working Principle

The LT3976EUDD#PBF is a synchronous step-down DC-DC buck regulator that uses a low on-resistance P-channel MOSFET as the power switch. The power switch is turned-on and off at a frequency determined by an internal oscillator. The oscillator can be synchronized to an external clock signal. The switch also regulates the output voltage by varying the duty cycle. The feedback voltage is compared with a band gap reference voltage and the result is used to drive the power switch.

To ensure high efficiency and accuracy, the LT3976EUDD#PBF employs advanced techniques, such as current-mode control, pulse-frequency modulation, and voltage-mode control. The current-mode control ensures fast and tight transient response, while the PFM mode ensures high-efficiency at light loads. The voltage-mode control ensures line and load regulation.

The LT3976EUDD#PBF also offers additional features such as adjustable soft-start and adjustable input current limit. The adjustable soft-start feature reduces inrush current during start-up and prevents overshoot at the output voltage. The adjustable input current limit feature reduces the switch\'s power dissipation, allowing higher output current.

Conclusion

The LT3976EUDD#PBF is a high efficiency, low voltage, step-down switching regulator. It can operate from input voltages as high as 18V, while maintaining excellent line and load regulation. It offers adjustable soft-start and input current limit protection, and is ideal for applications that require precise, high-accuracy, low-voltage regulation. It employs advanced techniques, such as current-mode control, pulse-frequency modulation, and voltage-mode control. The LT3976EUDD#PBF is available in 10-pin DIP, 14-pin SOIC, and 20-pin TSSOP packages.

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