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-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

产品详情

主要特征

应用/用途

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 0
VOUT1 (V) (max) -100
IOUT1 (A) (max) 1
Switch Type External
Preset VOUT (V) -5
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.71
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简化框图

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参量

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) 0
VOUT1 (V) (max) -100
IOUT1 (A) (max) 1
Switch Type External
Preset VOUT (V) -5
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.71

主要特征

  • 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

应用/用途

  • 电池供电应用
  • 数据通信
  • 高效DC-DC转换器
  • LCD偏置发生器

描述

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.

简化框图

MAX774、MAX775、MAX776:典型工作电路 MAX774、MAX775、MAX776:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心