LM26003MHX/NOPB Integrated Circuits (ICs)

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Introduction

The LM26003MHX/NOPB is a monolithic integrated voltage regulator with a step-down buck topology that switch-mode produces a clean, regulated output voltage at load current up to 2A. This DC-DC switching regulator belongs to the family of Power Management Integrated Circuits (PMICs) as a voltage regulator and is part of the DC-DC switching regulators, providing a highly efficient and cost-effective solution for powering and protecting a wide variety of voltage-sensitive applications. This unregulated input voltage and output voltage regulator has typical efficiency of over 90% and the package design allows for an inductor-free multiple output designs.

Application Field

The LM26003MHX/NOPB can be a great solution for low-power consumer and industrial products that require low to medium power regulators such as battery charge supplies, power adapters, white goods, consumer electronics, industrial and consumer chargers, and portable devices. It provides an ultra-low power standby mode, programmable output programming, slew rate control and over-current protection features along with an input voltage range of 4.5V to 30V.

This regulator was specifically designed to provide a self-contained DC-DC regulator solution for high power-density, low-voltage power supplies used in consumer and industrial applications. It can support a wide range of operating temperatures between –40°C and 125°C, and it complies with UL 60950 and EN 60529. Additionally, it has built-in fault protection features providing over-current protection, over-voltage protection, and thermal shutdown. The device also features low-ripple dynamic operation during load line transients.

Working Principle

The LM26003MHX/NOPB is a monolithic integrated voltage regulator with a step-down buck converter topology that switch-mode produces a clean, regulated output voltage at load current up to 2A. The step-down buck converter topology uses switches to drive transformers, inductors and diodes to supply regulated output voltage. This circuit is a control loop that uses feedback to manage the current and voltage levels by accurate regulation of the output voltage. The LM26003MHX/NOPB has an operating frequency of up to 500kHz, and its internal switch is designed to operate efficiently over an extensive temperature range. The step-down buck converter circuit is designed to take input from the bus voltage and boost it to the output voltage, which is then regulated and delivered to the load.

The control loop of this voltage regulator is designed to self-already for selecting its operating frequency in order to maintain the output voltage. It checks its output level, then switches its internal switch at a certain frequency in order to maintain that voltage level. The internal switch is programmed to act as an on/off switch and can act as a constant frequency oscillator, ensuring that the output voltage is kept within its set limits throughout the entire load range.

The LM26003MHX/NOPB includes an internal current limit circuit, controlling the amount of current passing through the device. This circuit can be programmed to provide a specific load current limit. It also features built-in thermal protection, whose duty is to shut down the device in case of an over-temperature event. Additionally, it comes with a power-on reset (POR) feature which monitors the input power source and controls the output voltage, ensuring a smooth startup.

In addition, the LM26003MHX/NOPB also includes a soft-start circuit, enabling the user to control the rate at which the output voltage ramps up. This feature is useful for applications where a smooth start is required and helps reduce inrush current during initial turn-on. Furthermore, this device also provides a ‘Power Good’ output, indicating when the output voltage has reached its regulated level and is providing a stable output.

Conclusion

The LM26003MHX/NOPB is a monolithic integrated voltage regulator with a step-down buck topology that switch-mode produces a clean, regulated output voltage at load current up to 2A. This device belongs to the family of Power Management Integrated Circuits (PMICs) as a voltage regulator and is a member of the DC-DC switching regulators, providing a highly efficient and cost-effective solution for powering and protecting a wide variety of voltage-sensitive applications. This DC-DC switching regulator features built-in fault protection, programmable output and over-current protection features along with an input voltage range of 4.5V to 30V and the package design allows for an inductor-free multiple output designs.

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