LM2724AMX

PMIC – Gate Drivers

LM2724AMX is a pulse-width modulation (PWM) current-mode step-down regulator, mainly used in a wide range of applications such as automotive, industrial and computer systems. PWM-current-mode regulators are often used in power supply design since they provide good line to regulator response, especially at light-load conditions. The LM2724AMX features a built-in pulse-by-pulse current limit protection. This feature helps reduce stress on the device body diode, making the regulator easier to drive. Additionally, the device is compatible with the latest automotive Lighting standards.

Application Field

The LM2724AMX power management integrated circuit (PMIC) is intended for use as a gate driver driving the low-side switches of a low-side drive (LSD) module in automotive end applications. Its built-in safety features, including pulse-by-pulse current limiting protection and over voltage protection, make it suitable for use in a variety of automotive applications, such as the control of cruise control systems, lighting control, fan motors, and injector control.

The LM2724AMX has been designed to provide basic switching and protection features required in DSL, PWM, and high-power lighting solutions, as well as applications that require low-side switching. Furthermore, the device is designed to protect the operation of the downstream load even in the event of a failure in the power management Integrated Circuit (PMIC).

Working Principle

The LM2724AMX works by directly controlling the switching of the low-side switches of a low-side drive (LSD) module. When enabled, the device builds a high-side drive, allowing the low-side switches to be controlled. The device internally contains current-limit protection and over-voltage protection, thus providing a safe and reliable operation even in case of failure.

When switching on the low-side switches, the high-side input of the LM2724AMX is connected to the low-side input of the module, with the corresponding low-side switch turning on. The low-side switches are then enabled, allowing the PWM signals to control the current flow through the module. The device also limits the inrush current of the LSD module, thus providing a safe and reliable operation.

When the device is switched to the off state, the device internally operates in an open-collector configuration and the high-side switch of the LSD module is disconnected from the input, preventing the current flow. This feature ensures smooth operation and improved module efficiency.

Conclusion

In conclusion, the LM2724AMX is a low-voltage PWM-current-mode step-down regulator intended for use as a gate driver driving the low-side switches of a low-side drive (LSD) module in automotive end applications. The device features current-limit protection, over-voltage protection, and open collector configuration, making it suitable for various applications. The device is capable of providing efficient operation and improved module efficiency.