Maxim MAX77812四相大电流降压稳压器解决方案

Maxim公司的MAX77812是四相大电流降压稳压器,输入电压从2.5V到5.5V,输出电压从0.25V到1.525V,每步5mV,最大输出电流20A,DC输出电压精度±0.5%, 3.8VIN, 1.1VOUT,L = 220nH (9mΩ DCR)时的峰值效率91%,主要用在智能手机和平板电脑,游戏控制台,DSLR照相机,无人驾驶飞机,微处理器(CPU/GPU)和FPGA以及通信模块.本文介绍了MAX77812主要优势和特性,框图,应用框图以及评估板MAX77812 EVK主要特性,电路图,材料清单和PCB设计图.
The MAX77812 is a quad-phase, high-current, buck regulator for multicore applications processors in the lat­est smart phones and tablets. The MAX77812 achieves world-class transient response with miniature PCB foot­print through the use of small inductors and output capaci­tors. Differential remote sense feedback enables tight DC and AC accuracy at the point of load. The MAX77812’s flexible architecture allows user-selectable phase configu­rations such as 4, 3 + 1, 2 + 2, 2 + 1 + 1, and 1 + 1 + 1 + 1.
Programmable current limit minimizes inductor size given the system’s actual requirements. Programmable soft-start ramp rate, rising and falling ramp rates, and startup operation provide control over inrush current as the regulator transitions between operating states. An output voltage range of 0.25V to 1.525V supports a wide range of application processors, down to the lowest power retention states.
Multifunction general-purpose inputs and high-speed serial interface provide flexible enable control of each regulator, DVS operation, and output voltage ramp rate control that enables rapid output voltage adjustment to optimize performance in all system operating states.
The MAX77812 features I2C-compatible, 2-wire serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL). The MAX77812 I2C supports SCL clock rates up to 3.4MHz. The MAX77812 I2C can be configured as a 26MHz (typ) SPI interface by I2C_SPI_SEL input pin.
The MAX77812 is available in a 64-bump 0.4mm pitch WLP package with a maximum height of 0.8mm