AP3409ADNTR-G1

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Introduction

The AP3409ADNTR-G1 is a integrated current-mode Pulse Width Modulation (PWM) DC-DC switching regulator, that is specifically designed for use in high current, wide input voltage and low output voltage applications such as server, storage, PC andcommunications applications.

Application Field and Working Principle

The AP3409ADNTR-G1 is designed to provide a low-cost, high-efficiency solution for applications from 2.5V up to 5.5V input and 3.3Voutput at up to45A load current. Its wide input range makes it the ideal choice for systems operating from a single supply or dual supply sources. Typical applications for the AP3409ADNTR-G1 include PCs and networking equipment, server, storage and communications systems.The AP3409ADNTR-G1 features a low start-up current (<0.1mA, single supply) to reduce system power loss and improve system efficiency. The internal integrated current-mode PWMregulator provides fast transient response times, excellent line and load regulations, automatically latched short circuit protection, and over-temperature protection. The on-chip thermal protection ensures the device will shutdown if a thermal overload is detected.

Configuration and Features

The AP3409ADNTR-G1 is a highly integrated switching regulator, featuring an integrated gate drive, which is designed to drive P-ChannelMOSFETs. The integrated P-Channel MOSFETs require only a small number of external components, resulting in board space savings. The AP3409ADNTR-G1 includes a synchronizable high side (HS) driver, along with a low side (LS) driver, which can be used to control two external switches. The AP3409ADNTR-G1 also includes an integrated switchingdelay control circuit, which provides a variable delay between the HS andLS outputs to optimize efficiency, current and EMI performance. The adjustable frequency range is from 300KHz to 1.3MHz.The AP3409ADNTR-G1 includes two integrated comparators and two comparatormodes to allow for the output voltage either to be monitored or the load current to be monitored. The remote sensing inputs allow for the regulationpoint to be accurately monitored and adjusted at the load side. The AP3409ADNTR-G1 also includes a high-speed internal Soft Start circuit, which startsthe regulator at the lowest possible output voltage while limiting the peakinrush current.

Conclusion

The AP3409ADNTR-G1 is an integrated and highly efficient current-mode PWMDC-DC switching regulator designed to provide a low-cost and high-efficiency solution for applications from 2.5V up to 5.5V input and 3.3Voutput at up to 45A load current. Its wide input range and low start-up current makes the device ideal for use in server, storage, PC and communications systems. The AP3409ADNTR-G1 includes an integrated gate drive, two integrated comparators, remote sensing inputs, adjustable frequency range, and an integrated switching delay control circuit for optimizing efficiency, current and EMI performance.

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