MAX749：数字调节LCD偏置电源
可提供> -100V的驱动
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.
关键特性
| MAX749：典型工作电路 应用
|
数据手册DataSheet
| 语言 | 下载文件 | 备注 |
|---|---|---|
| 英文 | MAX749.pdf | Rev 1; 02/1995 |
关键参数
| Part Number | VIN (V) | VIN (V) | VOUT1 (V) | VOUT1 (V) | IOUT1 (A) | Output Adjust. Method | DC-DC Outputs | Oper. Freq. (kHz) | Switch Type | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | max | See Notes | ||||||
| MAX749 | 2 | 6 | -2 | -100 | 0.1 | Resistor | 1 | 500 | External |
| $2.79 @1k |
技术资料
相关产品
- MAX774：-5V/-12V/-15V或可调、高效率、低IQ、反相、DC-DC控制器
订购型号
| 型号 | 状况 | 推荐替代产品 | 封装 | 温度 | RoHS/无铅 |
|---|---|---|---|---|---|
| MAX749C/D | 停止供货 | DICE SALES,；NA引脚；DICE； | 0°C至+70°C | 参考数据资料 | |
| MAX749CPA | 停止供货 | MAX749CPA+ | PDIP(N),；8引脚；79.7mm² | 0°C至+70°C | RoHS/无铅：否 |
| MAX749CPA+ | 生产中 | PDIP(N),；8引脚；79.7mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX749CSA | 停止供货 | MAX749CSA+ | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：否 |
| MAX749CSA+ | 生产中 | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX749CSA+T | 生产中 | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| MAX749CSA-T | 停止供货 | MAX749CSA+T | SOIC(N),；8引脚；30.9mm² | 0°C至+70°C | RoHS/无铅：否 |
| MAX749EPA | 停止供货 | MAX749EPA+ | PDIP(N),；8引脚；79.7mm² | -40°C至+85°C | RoHS/无铅：否 |
| MAX749EPA+ | 生产中 | PDIP(N),；8引脚；79.7mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX749ESA | 停止供货 | MAX749ESA+ | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：否 |
| 型号 | 状况 | 推荐替代产品 | 封装：类型 引脚 占位面积封装图 编码/变更 * | 温度 | RoHS/无铅？ |
| MAX749ESA+ | 生产中 | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX749ESA+T | 生产中 | SOIC(N),；8引脚；30.9mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| MAX749ESA-T | 停止供货 | MAX749ESA+T | N.SO；8引脚 | -40°C至+85°C | 参考数据资料 |
- MAX749.pdf MAX749
- Linear Regulators in Portable Applications MAX883
- MAX749.pdf MAX749
