LM3632AYFFR

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The LM3632AYFFR is an integrated switch-mode converter and high-efficiency, constant-current linear LED driver with integrated dual high side power MOSFETs. This driver is optimized to provide both step-up and step-down current regulation of one or two strings of LEDs, up to a maximum output current of 2A, by adjusting the voltage of an external control pin. The LM3632AYFFR belongs to the PMIC - LED drivers category and allows direct connection to a DC power source ranging from 4.5V to 36V, providing an adjustable constant output current, suitable for LED driving applications.

Features & Benefits

The LM3632AYFFR provides the performance and flexibility desired for LED lighting applications, including:

• Very low ripple current in light loadmode
• Two external resistors allowmin/max current limiting
• Programmable input voltage up to 36V
• Wide PWM dimming range as low as 0.1%
• Designed for automotive LED application
• Available in 8-pin thermally enhanced MLP
• Built-in Fault functions includeover voltage, over current and short

Application Field

The LM3632AYFFR is specifically designed for automotive exterior illumination, such as fog lamps, headlamps, tail lamps, daytime running lights, marker lights, etc. It provides excellent performance, energy efficiency, and design flexibility for these high power applications. The LM3632AYFFR is also suitable for general lighting applications such as street lighting and decoration lighting.

Working Principle

The LM3632AYFFR works in either step-up or step-down mode depending on the control voltage of the external control pin. In step-up mode, the output voltage is higher than the input voltage, and in step-down mode, the output voltage is lower than the input voltage. The direction of current flow in the power MOSFETs switches depending on the step-up or step-down mode. The LM3632AYFFR regulates the LED current using its dynamic hysteretic constant-current control loop. The LED current is adjusted by the voltage of the external control pin, and set using two external resistors. To ensure maximum efficiency and performance, the LM3632AYFFR is designed to minimize the bus voltage ripple,while allowing frequencies up to 100kHz.

Conclusion

The LM3632AYFFR is an integrated switch-mode converter and high-efficiency, constant-current linear LED driver with integrated dual high side power MOSFETs. It is optimized to provide both step-up and step-down current regulation of one or two strings of LEDs. It is specifically designed for automotive exterior illumination and suitable for general lighting applications such as street lighting and decoration lighting. The LM3632AYFFR regulates the LED current using its dynamic hysteretic constant-current control loop, while allowing frequencies up to 100kHz.

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