LM34919CQSD/NOPB

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The LM34919CQSD/NOPB is a synchronous buck voltage regulator that provides high efficiency, fast transient response, and high output current in a very small board footprint. It operates from 4.5V to 36V input and outputs up to 5A of load current. The fixed switching frequency is adjustable from 200kHz to 2.2MHz. The device features input voltage range under-voltage protection, available external synchronization, and pulse-by-pulse current limit for external sensing.

This DC/DC switching regulator operates by switching a constant current into an inductor, which then stores the energy and provides it to the output. When the switch is closed, the inductor keeps increasing its flux until it reaches the maximum acceptable value, or until the device turns the switch off. By changing the duty cycle of the switch, the controlled current can be adjusted not only to regulate the output voltage, but also to realize some level of power factor and efficiency.

The LM34919CQSD/NOPB comes with an internal circuit comprising a voltage comparator, a power MOSFET and a PC board, making it a superior solution over other voltage regulators in terms of size and efficiency. This integrated device also features protection features such as over-temperature protection, over-current protection, and under-voltage lock-out. It is designed for use in automotive, telecom, industrial and consumer applications, and is rated for operation up to -40°C to +125°C.

The LM34919CQSD/NOPB can be used as a single output regulator, or as a part of a multi-phase regulator solution. It integrates a wide range of features, allowing users to optimize efficiency and performance in space-constrained systems. The synchronous buck regulator is suitable for applications such as voltage conversion, voltage sequencing, and high current power management.

The device is recommended for use in ambient conditions up to +125°C, with a junction temperature limit of +150°C. It requires a minimum 10µF ceramic capacitor for stability and shock protection, as well as a 1µF ceramic capacitor for output voltage ripple filter. The device also features an enable pin that can be used to turn the LM34919CQSD/NOPB on or off, allowing users to conserve energy or prevent output voltage undershoot.

The LM34919CQSD/NOPB is a versatile DC/DC synchronous buck regulator suitable for a variety of applications. Its fast transient response, high efficiency, and small size make it an attractive solution for applications requiring efficient and cost-effective power management systems. The device is fully protected against over-temperature, under-voltage, and over-current conditions to maximize protection.

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