MIC68400中文资料4A Sequencing LDO with Ramp Control and Tracking数据手册Microchip规格书

描述 Description

The MIC68400 is a 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. The MIC68400 can also implement a variety of power-up and power-down protocols such as sequencing, tracking, and ratiometric tracking. The MIC68400 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 MIC68400 incorporates a delay pin (Delay) for control of power on reset (POR) output 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. Multiple MIC68400s 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 and turns off before (or after) the Master. This behavior is critical for power-up and power-down control in multi-output power supplies. The MIC68400 is fully protected offering both thermal, current limit protection, and reverse current protection. The MIC68400 has a junction temperature range of -40°C to +125°C and is available in fixed as well as an adjustable option.

特性 Features

Stable with 10µF ceramic capacitor
Input voltage range: 1.65V to 5.5V
0.5V reference
±2.0% output tolerance over temperature
4A maximum output current - peak start up
3A continuous operating current
Tracking on turn-on and turn-off with pin strapping
Timing controlled sequencing on/off
Programmable Ramp Control™ for in-rush current limiting and slew rate control of the output voltage during Turn-On and Turn-Off
Power-on reset (POR) supervisor with programmable delay time
Single Master can control multiple Slave regulators with tracking output voltages
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

MIC68400属于集成电路（IC）的线性+开关稳压器。由Microchip制造生产的MIC68400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。