L4941BV

L4941BV Application Field and Working Principle

The L4941BV series of low dropout (LDO) voltage regulators feature low noise, low quiescent current and high output accuracy, making them ideal for small handheld devices and battery powered applications. These small and cost-effective voltage regulators are designed to support up to 3A output current, enabling them to be employed in a wide range of applications from simple low current regulators to high current. They are also designed to tolerate wide operating temperature ranges, making them a suitable choice for automotive applications. As part of the L4941BV series, the UTC L4941BV is a low dropout positive voltage regulator that supports up to 1A output current. This regulator is compatible with almost all types of input voltages and provides an output voltage that is adjustable with a single external resistor.

The L4941BV product family is ideal for use in high precision, ultra-low noise power systems, providing tightly regulated outputs with built-in protection features. They offer programmable and flat line delay times, specifically designed for low current applications.The L4941BV is specifically designed for optimum efficiency, stability and maximum ripple rejection in noisy envelope applications. Its high level of power management performance, gives it great control and flexibility when used in various applications.

Working Principle of L4941BV

The L4941BV series of low dropout (LDO) voltage regulators are designed to manage power-supplies for small handheld devices and battery powered applications. The circuit works by using a voltage divider in order to proportionately reduce the input voltage to a level which is equal to the output voltage. The voltage regulator controls its output voltage using a feedback system. An error amplifier’s output is connected to the gate of a series pass transistor which alters the resistance of the pass transistor, thus altering the current flow from the input voltage source to the output load. With an optimal current flowing through the transistor, the output voltage will be regulated to the value indicated by the voltage divider.

The L4941BV series feature an integrated voltage reference (output voltage reference) and a series pass transistor whose impedance is adjusted according to the output voltage supplied from the reference. This provides a wide range of output voltages from 0.8V to 40V, depending on the output voltage reference used. The output voltage specification is signed to 3mA, so it can be precisely controlled; to achieve the specified output voltage, the series pass transistor is adjusted accordingly.

Protection features are available within the L4941BV series of LDOs to ensure safety and security. The over-current protection can be as low as 1mA and prevents damage to the circuit by shutting down the device when it detects an over-current. There is also over temperature protection which stops the device from operating if it becomes too hot. Additional features such as short-circuit protection and adjustable start-up delay times are available to ensure the optimum operation of the device.

Application Field

The L4941BV series can be used for applications such as low noise amplifiers, power management for microcontrollers, low power digital-to-analog convertors and high end analog amplifiers. It also has uses in automotive and industrial applications, such as reversing/braking/starting of motor drives, fuel/ignition systems and movement control for automated systems. It can be used in a variety of controlled precision applications, such as sensors, robotics, miscellaneous industrial and professional applications.

The L4941BV series offers unprecedented performance, in terms of output noise, output accurate and long term stability. These features, along with its high level of protection features and its cost-effectiveness make it an ideal solution for a wide range of automotive, industrial and commercial applications.