数据手册：MAX887, MAX887H 内置功率MOSFET和检流电路，减少元件数并节省空间 .pdf [英文Rev.0(PDF,160kB)]
{状况：生产中。}
The MAX887 high-efficiency, step-down DC-DC converter provides an adjustable output from 1.25V to 10.5V. It accepts inputs from 3.5V to 11V and delivers 600mA. Operation to 100% duty cycle minimizes dropout voltage (300mV typ at 500mA). Synchronous rectification reduces output rectifier losses, resulting in efficiency as high as 95%.
Fixed-frequency pulse-width modulation (PWM) reduces noise in sensitive communications applications. Using a high-frequency internal oscillator allows tiny surface-mount components to reduce PC board area, and eliminates audio-frequency interference. A SYNC input allows synchronization to an external clock to avoid interference with sensitive RF and data-acquisition circuits.
The MAX887 features current-mode operation for superior load/line-transient response. Cycle-by-cycle current limiting protects the internal MOSFET and rectifier. A low-current (2.5µA typ) shutdown mode conserves battery life.
产品关键特性
- 95% Efficiency
- 600mA Output Current
- Cycle-by-Cycle Current Limiting
- Low-Dropout, 100% Duty-Cycle Operation, 300mV at 500mA
- Internal 0.6Ω (typ) MOSFET
- Internal Synchronous Rectifier
- High-Frequency Current-Mode PWM
- External SYNC or Internal 300kHz Oscillator
- Guaranteed 260kHz to 340kHz Internal Oscillator Frequency Limits
- 2.5µA Shutdown Mode
| 应用与使用范围
- 蜂窝电话
- 计算机外设
- 分布式供电系统
- 个人通信装置
- 便携式仪表
|
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 |
| MAX887HESA | 生产中 | SOIC(N)；8引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX887HESA+ | 生产中 | SOIC(N)；8引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX887HESA+T | 生产中 | SOIC(N)；8引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX887HESA-T | 生产中 | SOIC(N)；8引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
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