LM76003RNPT

LM76003RNPT Application Field and Working Principle

The LM76003RNPT DC-DC synchronous step-down regulator offers excellent performance, accuracy and a complete power solution. This device integrates powerful functions into a small footprint, making it ideal for a wide range of applications where tight component-level integration is required. It is suitable for use in multiple markets, including industrial, automotive, computing, consumer, and multimedia.

Product Overview

The LM76003RNPT features a high-performance synchronous buck die, adjustable output voltage and constant-on-time control for excellent line and load transient response. With a wide output voltage range of 0.5V to 5V, the LM76003RNPT supports a wide range of output power levels from 100mA to 12A. Housed in a thermally enhanced 8-lead PowerPAD with 24-pin TSSOP or 12-pin SOT-223 packages, this part meets stringent needs for board space and also meets the demanding requirements of cost-sensitive applications.

Key Features

• Wide input voltage range up to 36V
• Wide output voltage range from 0.5V to 5V
• Constant-On-Time control
• Output voltage accuracy of 1.0% (VIN ≥ 3.3V)
• Thermally enhanced power package
• High-efficiency up to 92%
• Over-voltage protection and inrush current limiting

Application Field

The LM76003RNPT is designed for multiple power management applications, including CPU core voltage regulation, memory voltage regulation, processor graphics voltage, digital power sequencing, sequencing, sequencing and sequencing and sequencing. Additionally, the LM76003RNPT is perfect for general-purpose step-down and lightweight power supply applications in industrial, automotive, computing, consumer and multimedia markets.

Working Principle

The LM76003RNPT buck regulator is based on the standard synchronous buck topology with an internal low side switch and an internal high-side switch. The controller is designed to achieve a constant on-time control loop which is key to providing excellent transient performance. The core of the controller consists of a high performance valley current-mode pulse width modulator (VCM-PWM) and an on-time generator.

The voltage sense input of the VCM-PWM is connected to the output voltage feedback. For the ramp waveform, the output of the VCM-PWM is compared with a ramp wave generated by the on-time generator. The comparator output signals the switching of the device based on the output voltage and the desired load current. When the output voltage drops below the set point, both the high and low side switches are turned on, and the synchronous buck converter operates in the continuous-conduction mode (CCM). This turns on the device until a steady-state condition is achieved.

Conclusion

The LM76003RNPT is an ideal solution for step-down and multi-phase power supplies. It combines complete power solution integration, high performance and excellent line and load transient response. It is ideal for multiple markets, including industrial, automotive, computing, consumer and multimedia.