LM27403SQE/NOPB

PMIC - Voltage Regulators - DC DC Switching Controllers

The LM27403SQE/NOPB is a high-performance multi-output DC/DC switching controller that leverages integration and digital features to achieve a high degree of system efficiency and power accuracy. It is designed to drive up to 8 synchronous or asynchronous switch-mode converters and provides multiple configuration options to best fit specific system requirements. In addition, its variable frequency of up to 2 MHz enables engineers to select the smallest inductors, saving BOM cost and board area.

Application Field

The LM27403SQE/NOPB has been designed for use in a variety of applications, including notebook computers and handheld devices such as tablets and smartphones. It can be used to provide power to a variety of components including power amplifiers, processors, flash memory, and system peripherals. Furthermore, its integrated features support up to 8 distinct output rails to ensure the system has the right voltage and power efficiency.

Working Principle

The LM27403SQE/NOPB implements an oscillator-driven, synchronous switching regulator with up to 8 outputs. It supports the use of both synchronous and asynchronous switching MOSFETs to build a wide variety of output voltages with high accuracy, efficiency, and power accuracy. It can generate high frequency switching waveforms with minimal output ripple, even at very light loads. Its programmable on-time feature allows engineers to adjust the output voltage as needed to achieve their desired power efficiency.

At the core of the device is a Power Bypass Logic (PBL) block which allows the output voltage to be bypassed at very light loads for improved efficiency. The PBL monitors the output voltage of the switching regulator and compares it to a reference voltage to determine if the output voltage should be bypassed. If the PBL detects that the output voltage is inaccurate, it can increase the frequency of the pulse width modulator (PWM) to help correct the output operating point.

The device also features a number of detailed power-management features including over-voltage protection, under-voltage protection, over-current detection, and temperature protection. In addition, the LM27403SQE/NOPB includes a digital soft-start feature which helps to minimize output inrush current and excessive current drain at start-up. This feature helps to ensure that the system operates within its specified limits even when a large capacitive load is connected.

The LM27403SQE/NOPB is an excellent choice for powering a wide range of applications because it integrates a number of features that can help improve system efficiency, power accuracy and user experience. Its integrated features, flexibility and adjustable switching frequency make it an attractive option for a variety of DC/DC applications.