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DAC控制、boost反相型LCD偏置电源,内置开关

产品详情

主要特征

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) -27.5
VOUT1 (V) (max) 27.5
IOUT1 (A) (max) 0.1
Switch Type Internal
Output Adjust. Method Digital
Resistor
# DC-DC Outputs 1
Alternate Topology Step-Up
Switching Frequency (kHz) 300
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.15
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
IOUT1 (A) (max) 0.1
Switch Type Internal
Output Adjust. Method Digital
Resistor
ICC (mA) (typ) 0.065
Shutdown Mode Supply Current (µA) (typ) 1.3
Shutdown Mode Supply Current (µA) (max) 4
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins QSOP/16
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简化框图

Technical Docs

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参量

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) -27.5
VOUT1 (V) (max) 27.5
IOUT1 (A) (max) 0.1
Switch Type Internal
Output Adjust. Method Digital
Resistor
# DC-DC Outputs 1
Alternate Topology Step-Up
Switching Frequency (kHz) 300
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.15
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
IOUT1 (A) (max) 0.1
Switch Type Internal
Output Adjust. Method Digital
Resistor
ICC (mA) (typ) 0.065
Shutdown Mode Supply Current (µA) (typ) 1.3
Shutdown Mode Supply Current (µA) (max) 4
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins QSOP/16

主要特征

  • Internal 500mA, 28V N-Channel Switch (no external FET required)
  • Adjustable Output Voltage to +27.5V or -27.5V
  • 6-Bit DAC-Controlled Output Voltage
  • Up to 90% Efficiency
  • Small 16-Pin QSOP Package (Same size as 8-pin SO)
  • Power-OK Indicator
  • 65µA Quiescent Current
  • 1.5µA Shutdown Current
  • Up to 300kHz Switching Frequency

应用/用途

  • 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
  • LCD正或负偏置
  • 变容调谐二极管偏置

描述

The MAX686 DAC-controlled boost/inverter IC converts a positive input voltage to a positive or negative LCD bias voltage up to +27.5V or -27.5V. The device features an internal N-channel MOSFET switch, programmable current limiting, and an internal 6-bit digital-to-analog converter (DAC) for digital adjustment of the output voltage. It comes in a small 16-pin QSOP package (same size as an 8-pin SO).

The MAX686 uses a current-limited, pulse-frequency-modulation (PFM) control scheme to provide high efficiency over a wide range of load conditions. Its high switching frequency (up to 300kHz) allows the use of small external components.

An LCDON output allows the LCD bias voltage to be automatically disabled when the display logic voltage is removed, protecting the display. The MAX686 has a +2.7V to +5.5V input voltage range for the IC, and a +0.8V to +27.5V input voltage range for the inductor. Typical quiescent supply current is 65µA. Shutdown current is 1.5µA.

The MAX686 offers high-level integration to save space, reduce power consumption, and increase battery life, making it an excellent choice for battery-powered portable equipment. The MAX629 is similar to the MAX686, except that it does not contain a built-in DAC. Both devices have evaluation kits to facilitate designs.

简化框图

MAX686:典型工作电路 MAX686:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

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