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MAX776：-5V/-12V/-15V或可调、高效率、低IQ、反相、DC-DC控制器

负压LCD偏置电源，可产生极高的负电源电压，输出电流高达1A

The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulse-frequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the break-down voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switches, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.

关键特性 85% Efficiency for 5mA to 1A Load Currents Up to 5W Output Power 100µA (max) Supply Current 5µA (max) Shutdown Current 3V to 16.5V Input Range -5V (MAX774), -12V (MAX775), -15V (MAX776), or Adjustable Output Voltage Current-Limited PFM Control Scheme 300kHz Switching Frequency

功能框图 产品应用 电池供电应用 数据通信 高效DC-DC转换器 LCD偏置发生器

关键参数

数据手册DataSheet

开发工具

• MAX774EVKIT
• MAX774IRGEVKIT

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