数据手册：MAX1623 业内尺寸最小的3A DC-DC，带有同步整流器 .pdf [英文Rev.2(PDF,256kB)]
{状况：生产中。}
The MAX1623 switch-mode buck regulator with synchronous rectification provides local CPU and bus-termination power in notebook and desktop computers. An internal 55mΩ (typ), 3A PMOS power switch and 60mΩ (typ), 3A NMOS synchronous-rectifier switch deliver continuous load currents up to 3A from a 5V supply with 95% typical efficiency. Output accuracy is ±1%, including line and load regulation.
The MAX1623 features constant-off-time, current-mode pulse-width-modulation (PWM) control with switching frequencies as high as 350kHz. An external resistor at the TOFF pin sets the off-time, allowing optimum design flexibility in terms of switching frequency, output switching noise, and inductor size. This device is available in a space-saving 20-pin SSOP package.
产品关键特性
- ±1% Output Accuracy, Including Line and Load Regulation
- 94% Efficiency
- Internal Switches
- 55mΩ PMOS Power Switch
- 60mΩ NMOS Synchronous-Rectifier Switch
- Guaranteed 3A Load Capability
- Minimal External Components
- Pin-Selectable Fixed 3.3V, 2.5V, or
Adjustable (1.1V to 3.8V) Output Voltage
- 4.5V to 5.5V Input Voltage Range
- 400µA (typ) Supply Current
- <1µA Shutdown Supply Current
- Constant-Off-Time PWM Operation
- Switching Frequencies Up to 350kHz
- Idle Mode™ Operation at Light Loads
- Thermal Shutdown Protection
- Available in 20-Pin SSOP
| 应用与使用范围
- 5V至3.3V转换
- CPU子卡电源
- 台式计算机总线端接电源
- DSP电源
- 笔记本电脑CPU I/O电源
|
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 |
| MAX1623EAP | 生产中 | SSOP；20引脚；57.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1623EAP+ | 生产中 | SSOP；20引脚；57.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1623EAP+T | 生产中 | SSOP；20引脚；57.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1623EAP-T | 生产中 | SSOP；20引脚；57.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
功能接近器件
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