数据手册：MAX722, MAX723 电池或墙上适配器供电系统，为逻辑电路及LCD供电 .pdf [英文Rev.0(PDF,568kB)]
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The MAX722 and MAX723 CMOS power-supply ICs create dual regulated DC outputs for small, battery-operated microprocessor systems. Each device generates a main output (3V or 5V, selectable) and a negative auxiliary output that is adjustable for LCDs. Each device accepts two input voltages. Power can come from a main battery (two or three alkaline or NiCAD), or an unregulated DC source such as an AC-DC wall adapter.
The MAX722/MAX723 provide three improvements over prior-art devices. Physical size is reduced; the high switching frequencies (up to 0.5MHz), made possible by MOSFET power transistors, allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is also improved to 87% (10% better than with low-voltage regulators made in bipolar technology). And supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation (PFM) control scheme.
The MAX722 and MAX723 differ only in the lower fixed output voltage of the main regulator, with a 3.3V output for the MAX722 and a 3.0V output for the MAX723.
For flash memory or PCMCIA applications that require a +12V output voltage, refer to the MAX717–721 data sheet.
产品关键特性
- Low 0.9V to 5.5V Battery Input Range
- Unregulated 7V to 20V DC Input Range
- Dual Regulated Outputs
- Main Output: 3.3V/5V
- Auxiliary Output: 0V to -100V
- 87% Efficiency at 200mA
- Efficient PRAM Keep-Alive: 80% at 1mA
- 8W/in³ Power Density
- 60µA Quiescent Current
- 20µA Shutdown Mode with VREF Alive
- 500kHz Maximum Switching Frequency
- ±1.5% VREF Tolerance (Over Temp.)
- Detect Output Power Failures
- 16-Pin Narrow SO Packages
| 应用与使用范围
- 条码扫描仪
- LCD对比度调节
- 医疗仪表
- 掌上电脑
- 便携式数据通信
- 便携式数据收集设备
|
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 |
| MAX722C/D | 停止供货 | MAX8631772+8570 | DICESALES；NA引脚；DICE；封装信息 | |
| MAX722CSE | 停止供货 | MAX8631772+8570 | SOIC(N)；16引脚；61.9mm²封装信息 | 0°C至+70°C |
| MAX722CSE+ | 停止供货 | MAX8631772+8570 | SOIC(N)；16引脚；61.9mm²封装信息 | 0°C至+70°C |
| MAX722CSE+T | 停止供货 | MAX8631772+8570 | N.SO；封装信息 | 0°C至+70°C |
| MAX722CSE-T | 停止供货 | MAX8631772+8570 | N.SO；16引脚封装信息 | 0°C至+70°C |
| MAX722ESE | 停止供货 | MAX8631772+8570 | SOIC(N)；16引脚；61.9mm²封装信息 | -40°C至+85°C |
| MAX722ESE-T | 停止供货 | MAX8631772+8570 | N.SO；16引脚封装信息 | -40°C至+85°C |
| MAX722EVKIT-SO | 停止供货 | MAX8631772+8570 | KIT；封装信息 | |
| MAX723C/D | 停止供货 | MAX8631772+8570 | DICESALES；NA引脚；DICE；封装信息 | |
| MAX723CSE | 停止供货 | MAX8631772+8570 | SOIC(N)；16引脚；61.9mm²封装信息 | 0°C至+70°C |
| MAX723CSE-T | 停止供货 | MAX8631772+8570 | N.SO；16引脚封装信息 | 0°C至+70°C |
| MAX723ESE | 停止供货 | MAX8631772+8570 | SOIC(N)；16引脚；61.9mm²封装信息 | -40°C至+85°C |
| MAX723ESE-T | 停止供货 | MAX8631772+8570 | N.SO；16引脚封装信息 | -40°C至+85°C |
功能接近器件
