LM5122QMHX/NOPB

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The LM5122QMHX/NOPB is a DC-DC switching controller designed to provide a cost-effective solution in a variety of power management applications ranging from traditional power supplies to automotive power solutions. It includes a multitude of features and protection functions that enable an efficient, low system cost design.

The LM5122QMHX/NOPB is a constant-on-time (COT) DC-DC switching controller designed for critical applications requiring high power density, low system cost, and high efficiency due to its integrated 40V/50mA power MOSFET, internal undervoltage lockout circuit, and cycle-by-cycle current limiting.

The LM5122QMHX/NOPB offers regulated output voltage control over a wide range of input sources. It may be used for a variety of applications including point-of-load (POL) conversion, EMI/RFI filterless power supplies and inverters, as well as high current battery chargers, load switches, automotive systems and other energy efficient solutions.

The LM5122QMHX/NOPB is a pulse-width modulated (PWM) switching regulator control IC. It is based on the COT (CONstant On-Time) architecture which is intended to improve transient load response by maintaining a nearly constant duty cycle and constant off-time. This feature helps reduce output voltage ripple and noise, while still providing excellent line and load transient response.

The LM5122QMHX/NOPB uses a voltage-mode architecture, allowing for a stable loop response with simple external components. An external voltage divider is used to monitor the output voltage during operation. A single resistor at the CS pin sets the reference voltage for accurate output monitoring. The LM5122QMHX/NOPB also includes a low-dropout linear regulator pin which may be used to control the internal high-voltage LDO.

The LM5122QMHX/NOPB also offers over-current protection and several other features to protect the system and the IC itself. The overcurrent protection consists of a cycle-by-cycle current limit that engages when either the VIN or VOUT reach ill-defined levels. Additionally, the LM5122QMHX/NOPB includes an internal overvoltage protection, an integrated soft-stop feature, and thermal shutdown protection.

In addition to its power management performance, the LM5122QMHX/NOPB offers an integrated fault signal output and an advantage of current mode control architecture which will reduce noise and EMI interference. This controller also offers a tightly regulated output voltage and delivers a high efficiency, stable power supply solution.

The LM5122QMHX/NOPB is a highly integrated switching controller designed for critical, cost-sensitive DC-DC conversion applications. With its low system cost and easy of use, it offers a convenient, reliable and cost-effective solution for many power management requirements.

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