MIC68220中文资料Dual 2A with Ramp Control and Tracking数据手册Microchip规格书

描述 Description

The MIC68220 is a dual high peak current LDO regulator designed specifically for powering applications such as FPGA core voltages that require high start-up current with lower nominal operating current. Capable of sourcing 2A of current per channel for start-up. The MIC68220 can also implement a variety of power-up and power-down protocols such as sequencing, tracking, and ratiometric tracking. The MIC68220 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, DSP, microcontroller, etc.). The MIC68220 incorporates a delay pin (Delay) for control of power on reset output (POR) at turn-on and power-down delay at turn-off. In addition there is a Ramp Control (RC) pin for either tracking applications or output voltage slew rate adjustment at turn-on and turn-off. This is important in applications where the load is highly capacitive and in-rush currents can cause supply voltages to fail and microprocessors or other complex logic chips to hang up. The MIC68220 can be configured in two modes. In tracking mode, the output voltage of Vout1 drives the RC2 pin so that the Vout2 tracks Vout1 during turn-on and turn-off. In sequencing mode, POR1 of Vout1 drives the enable pin (EN2) of Vout2 so that it turns on after the Vout1 and turns off before (or after) Vout1. This behavior is critical for power-up and power-down control in multi-output power supplies. The MIC68220 is fully protected offering both thermal and current limit protection, and reverse current protection.

特性 Features

• Stable with 4.7µF ceramic output capacitor
• 0.5V reference
• 2A maximum output current - peak start up
• Tracking on turn-on and turn-off with pin strapping
• Programmable Ramp Control™ for in-rush current limiting and slew rate control of the output voltage on Turn-On and Turn-Off
• Single Master can control multiple Slave regulators with tracking output voltages
• Fixed and adjustable output voltages
• Logic controlled shutdown
• Thermal shutdown and current limit protection

简介

MIC68220属于集成电路（IC）的线性+开关稳压器。由制造生产的MIC68220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。