LM2735YMF/NOPB

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PMIC (Power Management Integrated Circuits) are electronic components used to manage power in electronic systems. Among the various voltage regulators available, DC DC switching regulators are proving to be a popular choice in the market. One such regulator is the LM2735YMF/NOPB, a 5A switch capacitor regulator from Texas Instruments that offers several features and benefits. In this article, its application field and working principle are discussed.

Application Field:

The LM2735YMF/NOPB is designed for use in a variety of applications, including portable digital audio players, personal digital assistants, handheld gaming consoles, and digital cameras. This regulator can operate from an input voltage of 2.7 V to 6 V and provides an output voltage of 1.225 V to 5.5 V. It has an adjustable switching frequency of 300 kHz to 1.1 MHz and a power efficiency of nearly 96%. A unique feature of this regulator is that it offers programmable hysteretic control that helps it maintain output voltage accuracy over a wide range of input voltages.

The LM2735YMF/NOPB has dual power switches that minimize power losses in the operating range. The device also includes an under-voltage lockout (UVLO), which protects it from high-voltage spikes. The programmable UVLO can be set to any level between 0.3 V and 6V. This regulator also has an over-voltage protection (OVP) circuit which prevents the output voltage from dropping below the required level. Additionally, the device offers thermal warning output, thermal shutdown, and soft-start features.

Working Principle:

The LM2735YMF/NOPB is a buck-boost switching regulator, which means it can regulate an input voltage that is either higher or lower than the output voltage. For a buck regulator, the input voltage is higher than the output voltage and the switching regulator uses a switch to rapidly open and close the circuit, which reduces the current flowing into the load and produces a regulated output voltage. Conversely, for a boost regulator, the input voltage is lower than the output voltage and the switching regulator modifies the current flow to increase the voltage at the output.

The LM2735YMF/NOPB uses a control circuit to drive the switch, which is formed by a combination of an error amplifier, a comparator, and a driver. The error amplifier compares the output voltage with a reference voltage and creates an error signal. The comparator then amplifies this error signal and depending on the polarity, either turns the switch on or off. When the switch is closed, it allows current to flow from the input to the output and when it is open, the current stops flowing. This process is repeated at a high frequency and the output voltage will stay regulated as the switch open and close rapidly.

Conclusion:

The LM2735YMF/NOPB is a 5A switch capacitor regulator from Texas Instruments that is designed for use in a variety of applications. It offers an adjustable switching frequency of 300 kHz to 1.1 MHz and excellent power efficiency of nearly 96%. Additionally, it has several features such as programmable hysteretic control, dual power switches, under-voltage lockout (UVLO), over-voltage protection (OVP), thermal warning output, thermal shutdown, and soft-start. This regulator is a buck-boost switching regulator, which means it can regulate an input voltage that is either higher or lower than the output voltage. It uses a control circuit to drive the switch that is formed by a combination of an error amplifier, a comparator, and a driver, which repetitively open and close the switch to regulate the output voltage.

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