MIC24420中文资料Dual 1MHz 2.5A PWM Sync Buck Regulator数据手册Microchip规格书

描述 Description

The MIC24420/MIC24421 are synchronous PWM dual output step down converters with internal 2.5A high-side switches. The MIC24420/MIC24421 has an integrated low-side gate driver for synchronous step-down conversion by connecting an external N-channel MOSFET to achieve high efficiencies in low duty-cycle applications.

The MIC24420 switching frequency is 1MHz and the MIC24421 switching frequency is 500kHz. A patented control scheme allows the use of a wide range of output capacitance from small ceramic capacitors to large electrolytic types with only one compensation component. A 2% output voltage tolerance over the temperature range allows the maximum level of system performance. The MIC24420/MIC24421 power good signal allows full control for sequencing the output voltages with minimum external components.

An adjustable current limit allows the use of smaller inductors in lower current applications. The MIC24420/MIC24421has an operating junction temperature range of -40°C to +125°C.

特性 Features

• 4.5V to 15V input voltage range
• 2.5A per channel
• Pre-biased output startup capability
• 2% output voltage accuracy (over temperature)
• Output voltage sequencing
• Power good output
• Low-side current sensing allows very low duty-cycle
• Junction temperature range of -40°C to +125°C

简介

MIC24420属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由制造生产的MIC24420DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。