MP3398BGF

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PMIC - LED Drivers is a type of electronic product used to drive the light-emitting diode (LED) to the brightness required. The basic principle of operation is the use of a power management integrated circuit (PMIC) to control the flow of current or voltage to the LED based on the current conditions. A single package often includes multiple channels of independent current regulation and/or dimming control. The MP3398BGF is an example of this type of PMIC product.

The MP3398BGF is a multi-channel programmable current regulator IC in a 5.0mmx3.0mm package with a 1.5~6V operation voltage range. It offers a total of five channels with PWM dimming control, and each channel can be independently programmed for output current and dimming. The device has an on-chip voltage regulation that helps provide a constant output current over a wide range of supply voltages. The output current is also adjustable without adding any external parts.

Each channel of the MP3398BGF is capable of controlling four LED strings in a variety of LED topologies from series to parallel and can drive currents from a few milliamps to hundreds of milliamps. The device also features internal thermal shut down, allowing for operation up to a high temperature of 150°C. Additionally, the device is designed for low power consumption, with a very low standby power.

The primary application fields of the MP3398BGF include LED lighting and portable applications. When used in LED lighting applications, the device offers a wide range of scheduling and dimming capabilities, enabling customers to choose the most appropriate current and brightness settings for different applications. Additionally, the device is able to help optimize energy consumption by dynamically adjusting the output current as needed. For portable applications, the integrated voltage regulation helps simplify system design and minimize the number of external components needed.

The MP3398BGF requires a few additional external components to provide the desired operational capabilities. It is necessary to add a resistor to select the ouput current and a capacitor to filter the current. Also, an inductor may be required to limit inrush current and limit the voltage spike on the power MOSFET when the device is turned on. Additionally, a resistor is necessary to eliminate subharmonic oscillations when the LED in one channel is off or dimmed.

In order to illustrate the working principle of the MP3398BGF, consider a single LED string with a single PMOS switch connected to the LED. The device thresholds back bias to sense the current in the LED string, thereby controlling the voltage of the switch MOSFET. The on-state current (I_on) is set by the resistor connected to the current feedback pin. As the current in the LED string is below the I_on value, the charge pump turns the switch on, allowing the LED string to be illuminated. As the LED string current increases, the circuit will turn off the switch, thus reducing the current until it reaches a safe level.

The MP3398BGF features low power consumption, adjustable output current, and a wide temperature range, making it ideal for a variety of LED applications. With the added benefits of scheduling and dimming control, the device has become a popular choice for LED lighting and portable applications. Its simple working principle and few external components make it an attractive solution for design simplification and cost reduction.

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