MAX652中文资料5V/3.3V/3V或可调、高效率、低IQ、降压型DC-DC控制器数据手册ADI规格书

描述 Description

The MAX649/MAX651/MAX652 BiCMOS, step-down DC-DC switching controllers provide high efficiency over three decades of load current. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over loads ranging from 10mA to more than 2.5A.
These devices use miniature external components. Their high switching frequency (up to 300kHz) allows for less than 9mm diameter surface-mount inductors.
The MAX649/MAX651/MAX652 have dropout voltages less than 1V and accept input voltages up to 16.5V. Output voltages are preset at 5V (MAX649), 3.3V (MAX651), and 3V (MAX652). These controllers can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors.
These step-down controllers drive external P-channel MOSFETs at loads greater than 10W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.

特性 Features

• More than 90% Efficiency (10mA to 1.5A Loads)
• More than 12.5W Output Power
• 100µA Max Quiescent Supply Current
• 5µA Max Shutdown Supply Current
• Less than 1.0V Dropout Voltage
• 16.5V Max Input Voltage
• 5V (MAX649), 3.3V (MAX651), 3V (MAX652), or Adjustable Output Voltage
• Current-Limited Control Scheme
• Up to 300kHz Switching Frequency

应用 Application

• 5V至3.3V绿色PC应用
• 电池供电应用
• 高效降压转换器
• 元件数最少的DC-DC转换器

简介

MAX652属于集成电路（IC）的电压基准。由制造生产的MAX652电压基准产品属于基准电压源系列，可通过相对较不稳定的电源提供稳定的电势，电压值始终保持恒定，以便在测量、控制和类似应用中用作比较的标准。其功能行为可能与用于大功率调节的线性稳压器相似，但基准电压源器件却不适合用于此类用途。用作比较标准时，若输出电流容量或实际负载电流增大，其性能通常会降低。