MIC68401中文资料4A Sequencing LDO with Tracking and Ramp Control - Eval Board数据手册Microchip规格书

描述 Description

The MIC68401 is a high peak current LDO regulator designed specifically for powering applications such as FPGA core voltages that require high startup current with lower nominal operating current. Capable of sourcing 4A of current for start-up, the MIC68401 provides high power from a small QFN package. The MIC68401 can also implement a variety of power-up and power-down protocols such as sequencing, tracking, and ratiometric tracking.The MIC68401 operates from a wide input range of 1.65V to 5.5V, which includes all of the main supply voltages commonly available today. It is designed to drive digital circuits requiring low voltage at high currents (i.e., PLDs, DSPs, microcontrollers, etc.). The MIC68401 incorporates a delay pin (DELAY) for control of power-on-reset (POR) output at turn-on. In addition, there is a ramp control (RC) for either tracking applications or output voltage slew rate control at turn-on. These features are important in applications where the load is highly capacitive and inrush currents can cause supply voltages to fail and microprocessors or other complex logic chips to hang up.Multiple MIC68401s can be \"daisy chained\" in two modes. In tracking mode the output voltage of the master drives the RC pin of a slave so that the slave tracks the main regulator during turn-on and turn-off. In sequencing mode the POR of the master drives the enable (EN) of the slave so that it turns on after the master. This behavior is critical for power-up control in multi-output power supplies. The MIC68401 is fully protected offering both thermal, current limit protection, and reverse current protection.The MIC68401 has an adjustable output voltage. The junction temperature range of part is rated from 40°C to +125°C. The MIC68401 is offered in the small 16-pin 4mm x 4mm QFN package.

特性 Features

• Stable with 10µF ceramic capacitor
• Input voltage range: 1.65V to 5.5V
• Low 0.5V reference voltage
• ±2.0% output tolerance over temperature
• 4A output current
• Timing-controlled sequencing on/off
• Programmable Ramp Control™ for inrush current limiting and slew rate control of the output voltage during turn-on
• Power-on-reset (POR) supervisor with programmable delay time
• Single master can control multiple slave regulators with tracking output voltages
• Small 4mm x 4mm QFN package
• Maximum dropout (VIN _ VOUT) of 500mV over temperature at 3A output current
• Fixed and adjustable output voltages
• Excellent line and load regulation specifications
• Logic-controlled shutdown
• Thermal shutdown and current-limit protection

简介

MIC68401属于集成电路（IC）的线性+开关稳压器。由制造生产的MIC68401稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。