数据手册：MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885 .pdf [英文Rev.2(PDF,818.6kB)]
{状况：生产中。}
The MAX1778/MAX1880–MAX1885 multiple-output DC-DC converters provide the regulated voltages required by active matrix thin-film transistor (TFT) liquid crystal displays (LCD) in a low-profile TSSOP package. One high-power step-up converter and two low-power charge pumps convert the 2.7V to 5.5V input voltage into three independent output voltages. A built-in linear regulator and VCOM buffer complete the power-supply requirements.
The main step-up converter accurately generates an externally set output voltage up to 13V that can supply the display's row/column drivers. The converter's high switching frequency and current-mode PWM architecture provide fast transient response and allow the use of small low-profile inductors and ceramic capacitors. The low-power BiCMOS control circuitry and internal 14V switch (0.35≈ N-channel MOSFET) enable efficiencies up to 91%.
The dual low-power charge pumps (MAX1778/ MAX1880/MAX1881/MAX1882 only) independently regulate one positive output (VPOS) and one negative output (VNEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regulate output voltages up to +40V and -40V. A unique control scheme minimizes output ripple as well as capacitor sizes for both charge pumps.
A resistor-programmable, 40mA, low-dropout linear regulator (MAX1778/MAX1881/MAX1883/MAX1884 only) provides preregulation or postregulation for any of the supplies. For higher current applications, an external transistor can be added. Additionally, the VCOM buffer provides a high current output that is ideal for driving the capacitive backplane of TFT LCD panels. The VCOM buffer's output voltage is preset with an internal 50% resistive-divider or can be externally adjusted for other voltages.
The MAX1778/MAX1880–MAX1885 are protected against output undervoltage and thermal overload conditions by a latched fault detection circuit that shuts down the device. All devices are available in the ultra-thin TSSOP package (1.1mm max height).
产品关键特性
- 500kHz/1MHz Current-Mode PWM Step-Up Regulator
- Up to +13V Main High-Power Output
- ±1% Accurate
- High Efficiency (91%)
- Dual Regulated Charge-Pump Outputs (MAX1778/MAX1880–MAX1882 only)
- Up to +40V Positive Charge-Pump Output
- Up to -40V Negative Charge-Pump Output
- Low-Dropout 40mA Linear Regulator (MAX1778/MAX1881/MAX1883/MAX1884 only)
- Optional Higher Current with External Transistor
- 2.7V to 5.5V Input Supply
- Internal Supply Sequencing and Soft-Start
- Power-Ready Output
- Adjustable Fault-Detection Latch
- Thermal Protection (+160°C)
- 0.1µA Shutdown Current
- 0.7mA IN Quiescent Current
- Ultra-Small External Components
- Thin TSSOP Package (1.1mm max height)
| 应用与使用范围
- TFT-LCD台式机监视器
- TFT-LCD笔记本显示器
|
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 |
| MAX1778EUG | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1778EUG+ | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1778EUG+T | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1778EUG-T | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1880EUG | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1880EUG+ | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1880EUG+T | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1880EUG-T | 生产中 | TSSOP；24引脚封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1880EUG/V+ | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1880EUG/V+T | 生产中 | TSSOP；封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1881EUG | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1881EUG+ | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1881EUG+T | 生产中 | TSSOP；封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1881EUG-T | 生产中 | TSSOP；24引脚封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1882EUG | 生产中 | TSSOP；24引脚；52.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1882EUG-T | 生产中 | TSSOP；封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1883EUP | 生产中 | TSSOP；20引脚；45.2mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1883EUP-T | 生产中 | TSSOP；20引脚封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1884EUP | 生产中 | TSSOP；20引脚；45.2mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1884EUP-T | 生产中 | TSSOP；封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1885EUP | 生产中 | TSSOP；20引脚；45.2mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1885EUP-T | 生产中 | TSSOP；封装信息 | -40°C至+85°C | 参考数据资料 |
评估板与开发套件
相关芯片型号
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