数据手册：MAX1765 高效boost转换器，集成LDO，用于电池供电设备 .pdf [英文Rev.1(PDF,872kB)]
{状况：生产中。}
The MAX1765 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device operates at a high 1MHz fixed frequency while maintaining an exceptionally low quiescent supply current (200µA). Its small external components and tiny package make this device an excellent choice for small hand-held applications that require the longest possible battery life.
The MAX1765 uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Maxim's proprietary architecture significantly improves efficiency at low load currents while automatically transitioning to fixed-frequency PWM operation at medium to high load currents to maintain excellent full-load efficiency. Forced-PWM mode is available for applications that require constant-frequency operation at all load currents, and the MAX1765 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.
The MAX1765's low-dropout (LDO) linear regulator and DC-DC converter have separate shutdown control. The linear regulator's 250mΩ pass device maintains excellent dropout voltage at currents up to 500mA. The MAX1765 also features analog soft-start and current-limit functions to permit optimization of efficiency, external component size, and output voltage ripple.
The MAX1765 comes in a 16-pin QSOP package and a thermally enhanced 16-pin TSSOP-EP.
产品关键特性
- High-Efficiency Step-Up Converter
- Up to 93% Efficiency
- Adjustable Output from +2.5V to +5.5V
- Up to 800mA Output
- PWM Synchronous-Rectified Topology
- 1MHz Operating Frequency (or Sync)
- LDO Linear Regulator
- 500mA LDO Linear Regulator
- 2.85V Linear Regulator Output or Adjustable (1.25V to 5V)
- Low 125mV Dropout at 500mA
- +0.7V to +5.5V Input Range
- 0.1µA Logic-Controlled Shutdown
- Adjustable Inductor Current Limit and Soft-Start
- Thermal Shutdown
- 1.5W, 16-Pin TSSOP-EP Package Available
| 应用与使用范围
- 手持式仪表(PDA、掌上电脑)
- 掌上电脑
- PCS电话
- 个人通信装置
- 便携式音频播放器
- 无线手机
|
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 |
| MAX1765EEE | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1765EEE+ | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1765EEE+T | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1765EEE-T | 生产中 | QSOP；16引脚封装信息 | -40°C至+85°C | 参考数据资料 |
| MAX1765EUE | 生产中 | TSSOP-EP；16引脚；33.2mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1765EUE+ | 生产中 | TSSOP-EP；16引脚；33.2mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1765EUE+T | 生产中 | TSSOP-EP；16引脚；33.2mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1765EUE-T | 生产中 | TSSOP；16引脚封装信息 | -40°C至+85°C | 参考数据资料 |
功能接近器件
| MAX1705 | 1至3节电池、大电流、低噪声、升压型DC-DC转换器，带有线性稳压器 |
| MAX1706 | 1至3节电池、大电流、低噪声、升压型DC-DC转换器，带有线性稳压器 |
| MAX1700 | 1节至3节电池、大功率(1A)、低噪声、升压型DC-DC转换器 |
| MAX1701 | 1节至3节电池、大功率(1A)、低噪声、升压型DC-DC转换器 |
| MAX1703 | 1节至3节电池、大功率(1.5A)、低噪声、升压型DC-DC转换器 |
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