L4947H

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Linear voltage regulators are among one of the most important and widely used types of power management integrated circuit (PMIC). They are responsible for turning a supply voltage into a regulated, steady output voltage with minimal energy loss due to the device itself. One of the most popular voltage regulators is the L4947H, which offers high performance noise and power management efficiency.

The L4947H is a step-up DC-DC converter designed to regulate wide input voltage ranges from 2.5 V to 10 V. It has a versatile voltage range of fixed (5 V, 3.3 V, 1.8 V and 1.2 V ±10%) and adjustable output voltages of up to 10 V and down to 0 V. It can handle up to 25 A of output current, a power dissipation of up to 18W, and requires an external inductor.

The integrated circuit utilizes a voltage feedback loop and operates in constant frequency mode. This means the device will maintain a constant, steady frequency of switching regardless of load conditions and changes in output, allowing for excellent noise and power management efficiency. The device is also capable of providing protection against thermal, over-voltage, and short-circuit conditions, as well as soft-start, brown-in, and power-good functions.

The L4947H integrates a low-side MOSFET, a PWM voltage feedback loop, and a Schottky diode in a single package, making it ideal for industrial applications such as HVAC and motor control systems. It is also a perfect solution for automotive applications due to its high efficiency, reliability, and low power consumption and is widely used in various applications such as automotive lighting, IDLE, start/stop and body electronics.

The L4947H features an advanced step-up architecture based on a PWM oscillator and a dual ramp loop. This ensures that the output voltage remains stable even during load transients. In addition, the device integrates current sensing feedback and requires zero external components, making it a cost effective solution.

The device’s internal components, combined with its advanced architecture, result in superior performance and superior reliability. It is capable of operating safely over a wide temperature range and is rated to 2000V isolation voltage. Furthermore, it offers an integrated over-temperature protection and an extra power savings mode which reduces the overall power consumption of the device when in light loads.

The L4947H is a highly efficient and reliable linear voltage regulator that offers a number of features and benefits for a wide range of applications. Thanks to its advanced architecture and internal components, this PMIC offers superior performance, reliability, and low power consumption, making it ideal for many applications such as HVAC, motor control systems, automotive lighting, and body electronics.

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