LMR70503TM/NOPB

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The LMR70503TM/NOPB is a synchronous buck converter with integrated MOSFET switches and a voltage reference, that is specifically designed for applications that require high power density. This device has high efficiency and very low standby current and is an ideal choice for low power, portable, battery-operated applications. The LMR70503TM/NOPB can produce a output voltage from 0.8V to 5.5V with excellent line and load regulation, and is capable of providing up to 3A output current. It also features fixed frequency operation as well as short-circuit protection and over-temperature shutdown.

The LMR70503TM/NOPB is a part of Texas Instruments’ PMIC (Power Management IC) family of voltage regulators, specifically DC-DC switching regulators. DC-DC switching regulators are used to regulate and convert the supply voltage to other desired voltages. The LMR70503TM/NOPB integrates both the controller circuitry and the FET switches into a single package, making it easier to design and reducing the space needed on the board. It is also designed to have extremely low quiescent current, providing a great deal of system efficiency and power savings.

The LMR70503TM/NOPB uses a synchronous buck converter topology to generate the output voltage from the input voltage. A synchronous buck converter is used for applications where a step-down (buck) voltage converter is required with high efficiency. In the LMR70503TM/NOPB, the synchronous buck converter is controlled by an integrated temperature compensated voltage reference, along with an internal oscillator and clock generator.

The working principle of the LMR70503TM/NOPB starts with the voltage reference. This voltage reference provides an output that is proportional to the input voltage and is used to regulate the output of the buck converter. The internal oscillator then generates a clock signal that cycles the MOSFET switches, allowing current to pass through the inductor when the MOSFET is turned on, and then the charge stored in the inductor is released to the output capacitor when the MOSFET is switched off. This is what causes the output voltage to be lower than the input voltage. The frequency of the clock signal can be adjusted to gain precise control over the output voltage.

In summary, the LMR70503TM/NOPB is an integrated synchronous buck voltage regulator from Texas Instruments that can provide a wide range of output voltages from 0.8V to 5.5V with high efficiency and ultra-low standby power consumption. This device is ideal for use in low power and space conscious applications, such as those found in portable battery-operated devices.

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