LP2967IMM-2528/NOPB

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LP2967IMM-2528/NOPB is a single channel, low-dropout (LDO) linear voltage regulator produced by Texas Instruments. It is designed to serve as a medium-power regulator for portable products, and provides an ultra-low quiescent current at a constant output voltage.

Features

• Input Voltage Range: 1.8 V to 5.5 V
• Output Voltage Range: 0.5 V to 4.0 V
• Dropout Voltage: 0.1 V (< 1.5V Output Voltage)
• Quiescent Current: 1 A
• Linear Regulator Accuracy: 0.5%
• Shutdown Mode Quiescent Current: 0.1 A
• Over-Current Protection
• Under-Voltage Lockout
• Thermal Shut Down Protection
• Reverse Current Protection

Applications

• Cellular Phones
• USB Products
• DSL and Cable Modems
• Notebooks, Netbooks, and Tablets
• Portable Electronics
• Digital Cameras and Camcorders
• Portable Medical Equipment
• Portable Power Supply

Working Principle

The LP2967IMM-2528/NOPB operates by modulating the current through an external MOSFET terminals, and regulating the output voltage at the regulator input. The regulator uses a voltage mode control scheme to vary the current through the external MOSFET to maintain the output voltage. The output voltage (Vout) is monitored at the regulator feedback pin by an internal error amplifier. To regulate the output voltage, the error amplifier compares the feedback voltage with an internal reference voltage, and then produces an output signal that sets the level of current through the external MOSFET.

When the output voltage is at or above the set point voltage, the regulator detects the fact, and reduces the current through the MOSFET to maintain the output voltage. This reduces the power dissipation of the MOSFET, giving the LDO a better accuracy and efficiency. When the output voltage drops below the set point, the output voltage rises to the set point voltage. This makes it possible to achieve an exceptionally low drop-out voltage.

The LP2967IMM-2528/NOPB comes with a variety of features that increase the performance of the application. It includes a current limit feature that limits the maximum current flowing through the external MOSFET, and an under-voltage lockout feature that ensures that the output voltage doesn’t drop below the safe operating level. Additionally, the device has thermal protection that shuts the output off when the device temperature exceeds the safe operating range.

Conclusion

The LP2967IMM-2528/NOPB is a single-channel, low-dropout linear voltage regulator ideal for battery-powered and other mobile applications. It offers an ultra-low quiescent current, accurate output voltage, and comprehensive protection features. Thanks to its low power consumption and user-friendly features, the LP2967IMM-2528/NOPB is a great choice for medium-power regulation in many portable products.

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