数据手册：MAX1729 高精度偏置电源，允许使用低成本彩色ECB LCD .pdf [英文Rev.1(PDF,168kB)]
{状况：生产中。}
The MAX1729 micropower step-up/step-down DC-DC converter is
ideally suited for electrically controlled birefringence (ECB) and
liquid-crystal-display (LCD) bias-supply generation. It provides
step-up/step-down voltage conversion and reduces output ripple by using a step-up DC-DC converter followed by a linear regulator. This architecture permits a physically smaller inductor than those used in competing SEPIC and flyback topologies. This device features low quiescent current (67µA typical). A logic-controlled shutdown mode further reduces quiescent current to 0.4µA typical.
The MAX1729 features an input that dynamically adjusts the output
voltage to control display color or contrast. It offers two feedback modes:
internal and external. Internal feedback mode allows output voltages between 2.5V and 16V, and is specifically designed to hold temperature drift to ±11ppm/°C. External feedback mode allows the MAX1729 output voltage range to be tailored for various displays.
An on-chip temperature sensor with a positive temperature
coefficient provides compensation for LCD/ECB display temperature
characteristics. In internal feedback mode, the buffered temperature sensor
output is read and used to adjust the output voltage via a digital control
signal. External feedback mode features an additional compensation method in
which the temperature output is summed directly into the feedback network to
provide first-order negative temperature compensation of the output voltage. The
MAX1729 is available in the space-saving 10-pin µMAX package.
产品关键特性
- High-Accuracy Reference Voltage (±1%)
- ±11ppm/°C Output Voltage Drift
- On-Chip Temperature Sensor Output
- Accurate Voltage and Temperature Provide:
- Consistent ECB Colors
- Consistent LCD Gray-Scale Contrast
- +2.7V to +5.5V Input Voltage Range
- Output Voltage Range
- +2.5V to +16V in Internal Feedback Mode
- Programmable in External Feedback Mode
- Dynamic Control of the Output Voltage
- 67µA Supply Current
- 0.4µA Shutdown Current
- 10-Pin µMAX Package (1.09mm max height)
- Evaluation Kit Available (MAX1729EVKIT)
| 应用与使用范围
- 蜂窝电话
- ECB显示器偏置与彩色调节
- LCD显示器偏置与对比度调节
- PDA及其它手持设备
|
典型工作电路
芯片订购型号
| 订购型号 | 产品状态 | 封装形式 | 工作温度 | RoHS/无铅 |
| MAX1729EUB | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1729EUB-T | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
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