MAX1854 - 高速、数字可调、同步降压型控制器，集成电压定位电路

MAX1854是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1854是高速、数字可调、同步降压型控制器，集成电压定位电路，本站介绍了MAX1854的封装应用图解、特点和优点、功能等，并给出了与MAX1854相关的Maxim元器件型号供参考。

MAX1854 - 高速、数字可调、同步降压型控制器，集成电压定位电路 - DC-DC开关调节器 - 电压定位CPU电源，提供精确的电流检测 - 美信半导体

产品概述

The MAX1716/MAX1854/MAX1855 step-down controllers are intended for core CPU DC-DC converters in notebook computers. They feature a dynamically adjustable output (5-bit DAC), ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The MAX1716/MAX1854/MAX1855 are designed specifically for CPU core applications requiring a voltage-positioned supply. The voltage-positioning input (VPS), combined with a high DC accuracy control loop, is used to implement a power supply that modifies its output set point in response to the load current. This arrangement decreases full-load power dissipation and reduces the required number of output capacitors.

The 28V input range of the MAX1716/MAX1854/MAX1855 enables single-stage buck conversion from high-voltage batteries for the maximum possible efficiency. Alternatively, the devices' high-frequency capability combined with two-stage conversion (stepping down the +5V system supply instead of the battery) allows the smallest possible physical size. The output voltage can be dynamically adjusted through the 5-bit digital-to-analog converter (DAC) inputs.

The MAX1716/MAX1854/MAX1855 are available in a 24-pin QSOP package. For applications requiring SpeedStep® power control (see the MAX1717).

关键特性

以下关键特性由Maxim美信半导体提供：

High-Efficiency Voltage Positioning

Quick-PWM Architecture

±1% VOUT Line-Regulation Accuracy

Adjustable Output Range (5-Bit DAC)

MAX1716: 0.925V to 1.6V

MAX1854: 0.925V to 2.0V

MAX1855: 0.600V to 1.75V

2V to 28V Input Range

200/300/400/550kHz Switching Frequency

Output Undervoltage Protection

Overvoltage Protection (MAX1716/MAX1855)

Drive Large Synchronous-Rectifier MOSFETs

1.7ms Digital Soft-Start

700µA ICC Supply Current

1µA Shutdown Supply Current

2V ±1% Reference Output

VGATE Transition-Complete Indicator

Small 24-Pin QSOP Package

热门应用

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