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数字调节LCD偏置电源

可提供> -100V的驱动

产品详情

主要特征

应用/用途

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 6
VOUT1 (V) (min) -2
VOUT1 (V) (max) -100
IOUT1 (A) (max) 0.1
Switch Type External
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.11
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参量

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 6
VOUT1 (V) (min) -2
VOUT1 (V) (max) -100
IOUT1 (A) (max) 0.1
Switch Type External
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.11

主要特征

  • +2.0V to +6.0V Input Voltage Range
  • Flexible Control of Output Voltage:
    • Digital Control
    • Potentiometer Adjustment
    • PWM Control
  • Output Voltage Range Set by One Resistor
  • Low, 60µA Max Quiescent Current
  • 15µA Max Shutdown Mode
  • Small Size - 8-Pin SO and Plastic DIP Packages

应用/用途

  • 通信系统
  • 笔记本电脑
  • 笔记本电脑
  • 掌上电脑
  • PDA及其它手持设备
  • 便携式数据收集终端

描述

The MAX749 generates negative LCD-bias contrast voltages from 2V to 6V inputs. Full-scale output voltage can be scaled to -100V or greater, and is digitally adjustable in 64 equal steps by an internal digital-to-analog converter (DAC). Only seven small surface-mount components are required to build a complete supply. The output voltage can also be adjusted using a PWM signal or a potentiometer.

A unique current-limited control scheme reduces supply current and maximizes efficiency, while a high switching frequency (up to 500kHz) minimizes the size of external components. Quiescent current is only 60µA max and is reduced to under 15µA in shutdown mode. While shut down, the MAX749 retains the voltage set point, simplifying software control. The MAX749 drives either an external P-channel MOSFET or a PNP transistor.

简化框图

MAX749:典型工作电路 MAX749: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