LM2941T/LB03

The LM2941T/LB03 is an adjustable three-terminal low-dropout (LDO) regulator from Texas Instruments. It has a wide input voltage range of 2.7V-25V, a wide operating temperature range of -40°C to 125°C, and is available in a SOT-223 package. The LM2941T/LB03 is a LDO regulator with a fast transient response, low quiescent current, high current capability, and low noise. It has an adjustable regulated output voltage ranging from 1.8V to 13.2V. The LM2941T/LB03 has built-in protection features such as current limit, short-circuit protection, under-voltage lockout, reverse current protection, and thermal shutdown. The LM29LB03 is a variant of the LM2941T that is designed for automotive applications with an operating temperature range of -40°C to 140°C.

Application field of LM2941T/LB03

The wide input voltage and operating temperature ranges of the LM2941T/LB03 make it ideal for supplying power to a wide variety of applications in automotive, computer, industrial, and telecom systems. The LM2941T/LB03, with its fast transient response, has been designed for use in mobile phones and other portable devices. It can be used in automotive power distribution systems and industrial systems as a power source for logic regulators and processors. The regulator is also suitable for powering post-regulation circuitry and other loads that require a tightly regulated voltage.

Working Principle of LM2941T/LB03

The LM2941T/LB03 is a low-dropout voltage regulator that operates based on the principle of negative feedback. It has an internal reference voltage (1.25V) and an error amplifier that compares the output voltage to the reference voltage and adjusts the gate voltage of an internal power transistor to regulate the output voltage. The power transistor is connected to the input voltage and the adjustable output voltage and acts as a switch to control the current flow from the input to the output. The output voltage is adjusted using an external resistor divider. The LM2941T/LB03 also has a standby control mode when the output voltage is slightly reduced to reduce the quiescent current when the regulator is in standby.

The LM2941T/LB03 has built-in protection features including current limiting, short-circuit protection, under-voltage lockout, reverse current protection, and thermal shutdown. The current limit is typically set at 1.5A and the short-circuit protection limits the output current to the current limit level or just below. The under-voltage lockout prevents the regulator from operating if the input voltage is too low and the reverse current protection prevents reverse current flow in the VIN pin when the regulator is off. The thermal shutdown feature prevents the regulator from overheating which can cause damage to the components.

The LM2941T/LB03 is a low-dropout voltage regulator with a wide input voltage range and a wide operating temperature range. It offers fast transient response, low quiescent current, high current capability, and low noise. It has built-in protection features including current limit, short-circuit protection, under-voltage lockout, reverse current protection, and thermal shutdown. The LM2941T/LB03 is an ideal power solution for a wide variety of applications in automotive, computer, industrial, and telecom systems.