LM27213MTDX/NOPB

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The LM27213MTDX/NOPB is a monolithic switching regulator specifically designed for single-cell Li-Ion battery and multi-cell alkaline/NiCd/NiMH battery applications. This integrated circuit (IC) is an ideal solution for controlling the power dissipation of battery powered portable applications. The LM27213MTDX/NOPB is a DC-DC Switching Controller that regulates output voltage from 0.8V to 5.6V. It is a current mode step-down DC-DC switching regulator featuring a low drop-out voltage of 180mV and a wide output voltage adjustment range.

The LM27213MTDX/NOPB can provide up to 1A of continuous load current and up to 2A of pulse current at a 3 MHz switching frequency. It features unconditional short-circuit protection, which prevents the external switch FET, filter inductor and filter capacitor from damage in the event of an output overload. Additionally, it has thermal shutdown protection and over current protection. The IC is available in a small SSOP-8 package.

Application fields

The LM27213MTDX/NOPB is suitable for applications demanding very high efficiency and small solutions size. These include process control systems, automotive, portable computing and battery powered devices, and consumer electronics. It is also used in applications requiring very low quiescent currents, such as for data loggers.

Working principle

The LM27213MTDX/NOPB is a monolithic switching regulator IC that regulates the output voltage through a buck-boost power topology. The IC uses an inductor and capacitor as components in order to regulate the output voltage. A current mode PWM controller is employed in order to control the switching frequency. The LM27213MTDX/NOPB has an important feature known as the Adaptive Off-time Control (AOTC), which optimizes the efficiency of the regulator by adjusting the internal loop gain according to the load condition. AOTC also reduces the ripple and EMI noise by selecting the operating frequency.

The LM27213MTDX/NOPB provides many useful features, such as over-current protection and thermal shutdown with overtemperature warning. It also has a wide input voltage range of 4.5V to 5.5V, and enables pre-bias startup for portable systems, which increases the utilization of NiMH/NiCad batteries. The IC includes an internal soft-start with an adjustable delay time of up 0.5s. Additionally, the output voltage can be programmed using a single external resistor.

In summary, the LM27213MTDX/NOPB is a high efficiency, low noise, low drop-out DC-DC switching regulator. It is designed for battery powered applications and features current mode operation, short-circuit protection, over-current protection, and AOTC control. The wide input voltage range, adjustable switching frequency, and pre-bias startup make it an ideal solution for cost sensitive, low power applications.

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