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LM26003QMHX/NOPB Application Field and Working Principle

The LM26003QMHX/NOPB is a low cost, highly flexible, monolithic synchronous buck regulator ideal for use as DC-DC converters in portable applications such as laptop computers, digital cameras, and cell phones. This chip is classified as a PMIC – Voltage Regulator – DC-DC Switching Regulators, and is designed with a Type II compensation loop to address the output voltage regulation issue typically associated with Type II compensation solutions.

Overview

The LM26003QMHX/NOPB is a synchronous buck switching regulator with a 0.2 ohm on-chip N-channel MOSFET driver. It includes an internal 1A Drivers section and an internal 3A Drivers section and the 2MHz to 4MHz switching frequency range makes it ideal for applications that require fast transient responses. The device includes integrated current sensing, cycle-by-cycle over current protection and adjustable soft-start, making it an ideal choice for small portable applications.

Features

• Wide input voltage range: 2.7V to 21V
• Fixed output voltage option: 1.5V, 1.8V, 2.5V, 3.3V, 5V
• Output voltage adjust range from 0.6V to 6V
• Output current up to 3A continuous
• On-chip precision references for VOUT control
• Integrated cycle-by-cycle over current protection
• Integrated soft-start
• 2MHz to 4MHz switching frequency range
• 3A N-channel MOSFET driver
• Low quiescent current of 5mA
• SMD-6 3x2mm package

Application Fields

The LM26003QMHX/NOPB is ideal for use in battery-powered portable applications such as laptop computers, digital cameras and cellular phones. It can be used to convert a 5V input voltage to various adjustable output voltages. The device achieves up to 95% efficiency and offers a low quiescent current of 5mA. The device\'s design facilitates thermally efficient methods of operation, achieved by placing the power supply and the load in close proximity.

Working Principle

The LM26003QMHX/NOPB operates in a fashion similar to other buck regulators. At the start of the switching cycle, Switch S1 is closed. This compels current to flow through the inductor and output capacitor, increasing the energy stored in each. As energy reaches its peak, the voltage at the output terminal of the inductor begins dropping. To maintain the output voltage, the driver then switches S1 open and switches S2 closed. This redirects the inductor current through the output capacitor, allowing the stored energy to discharge and maintain a constant voltage at the output. The switching of S2 also charges the inductor and the output capacitor again, allowing the process to repeat itself.

The LM26003QMHX/NOPB incorporates a number of features designed to improve efficiency and reduce the amount of external components required. These include an integrated 3A N-channel MOSFET driver, adjustable soft-start, current sense amplifiers, and internal voltage and current references. This allows the device to operate at higher output voltages and higher levels of efficiency without the need for external components.

Conclusion

The LM26003QMHX/NOPB is an ideal choice for DC-DC conversion in battery-powered portable applications. It offers low cost, high levels of efficiency, and a wide input voltage range. Its internal features simplify the design process, while its on-chip Drivers, current sense amplifiers and internal references dramatically reduce the amount of external components required. All of this combines to make the LM26003QMHX/NOPB an attractive option for small, low power applications.

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