数据手册：MAX1733, MAX1734 高效DC-DC方案，用于低压逻辑电路供电 .pdf [英文Rev.0(PDF,280kB)]
{状况：生产中。}
The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 excellent high-efficiency alternatives to linear regulators in space-constrained applications.
Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.
The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.
产品关键特性
- 250mA Guaranteed Output Current
- Synchronous Rectifier for Over 90% Efficiency
- Tiny 5-Pin SOT23 Package
- 40µA Quiescent Supply Current
- 0.01µA Logic-Controlled Shutdown
- Up to 1.2MHz Switching Frequency
- Fixed 1.8V or 1.5V Outputs (MAX1734)
- Adjustable Output Voltage (MAX1733)
- ±1.5% Initial Accuracy
- 2.7V to 5.5V Input Range
- Soft-Start Limits Startup Current
| 应用与使用范围
- 蜂窝电话
- 计算机：台式机、工作站和服务器
- 消费类音频
- 数码相机
- 全球定位系统(GPS)
- 掌上电脑
- POS终端
- 无线数据
- 无线局域网(WLAN)
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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 |
| MAX1733EUK+ | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1733EUK+T | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1733EUK-T | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1733EUK-TG05 | 生产中 | SOT；封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1734EUK15 | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1734EUK15+ | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1734EUK15+T | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1734EUK15-T | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1734EUK18+ | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1734EUK18+T | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1734EUK18-T | 生产中 | SOT；5引脚；9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
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