LP2950ACZ-5.0/LFT3

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LP2950ACZ-5.0/LFT3 is a linear voltage regulator that belongs to the family of PMIC (Power Management IC) Fixed Voltage Regulators manufactured by Texas Instruments. The device is a low dropout three-terminal adjustable version of the LP2950CZ-5.0/LFT3 series, designed to provide a local 5V output using an input voltage from 4.1V to 10V. The device features adjustable output voltage from 2.5V to 8V and low dropout voltage (V LDOP ) below 1.1V for a full-load current of 1A or with a maximum quiescent current under normal operating conditions (I QUIET ) below 32mA.

The main features of LP2950ACZ-5.0/LFT3 are:

• Low dropout voltage: 1.1V (typical) at 1A load.
• Low quiescent current: 32mA (typical) at 5V output.
• High output current: 1A.

The LP2950ACZ-5.0/LFT3 can be used in various applications, such as providing local power in automotive applications, providing logic power/standby power/standalone power in telecom and network applications, setting reference voltages in A/D converters, setting voltage references in op amps, controlling power demand in motor drivers and providing local power in portable devices.

The circuit for the LP2950ACZ-5.0/LFT3 regulator is a voltage-controlled current source and is based on the principle of constant current/voltage control. In the circuit, the LP2950CZ-5.0/LFT3 operates, depending on the voltage over the resistor (R1) to optimize its output voltage and current. The control loop of the device is sufficiently fast to accommodate a wide range of output voltage and current demands. This device is capable of driving up to 1A of current from an input voltage range of 4.1V to 10V.

The LP2950ACZ-5.0/LFT3 output voltage can be adjusted by connecting an external resistor divider to the adjustment pin, which sets the output voltage ratio. The ratio of the output voltage to the adjustment pin voltage is about 1.335/1. This ratio can be changed by changing the ratio of the external resistors.

The device typically features an output voltage range from 2.5V to 8V and an output current of up to 1A. The output voltage ripple is minimal, thanks to its high output impedance. This device also provides short circuit protection and thermal protection, which is enabled by the internal thermal shutdown circuitry and current limiting feature that monitors the current of the internal MOSFET. In addition, the device includes an open gate drive pin that prevents the device from operating in an undesired state.

In conclusion, LP2950ACZ-5.0/LFT3 is a linear voltage regulator well suited for applications requiring low dropout voltage and current, high output current with low quiescent current, and adjustable output voltage. Due to its extended input voltage range and wide output voltage range, it is well suited for a broad range of applications. The device is easy to use and provides the user with stability, flexibility, and reliability.

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