数据手册：MAX1678 高效1节电池升压转换器，用于寻呼设备 .pdf [英文Rev.0(PDF,176kB)]
{状况：生产中。}
The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery. It guarantees a 0.87V start-up voltage and features a low 37µA quiescent supply current.
The device includes a 1Ω, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry, and circuitry to reduce inductor ringing-all in an ultra-small, 1.1mm-high µMAX® package.
The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2µA shutdown mode.
产品关键特性
- 0.87V Guaranteed Start-Up
- Up to 90% Efficiency
- Built-In Synchronous Rectifier (no external diode)
- Ultra-Small µMAX Package, 1.1mm High
- 37µA Quiescent Current (85µA from 1.5V battery)
- 2µA Logic-Controlled Shutdown
- Power-Fail Detector
- Dual Mode™ Output: Fixed 3.3V
- Dual Mode Adjustable 2V to 5.5V
- 45mA Output Current at 3.3V for 1-Cell Input
- 90mA Output Current at 3.3V for 2-Cell Input
- Inductor-Damping Switch Suppresses EMI
| 应用与使用范围
- 寻呼机
- 个人医疗监视器
- 指针设备
- 远端控制
- 单节电池供电设备
|
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 |
| MAX1678EUA | 生产中 | µMAX；8引脚；15.6mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1678EUA+ | 生产中 | µMAX；8引脚；15.6mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1678EUA+T | 生产中 | µMAX；8引脚；15.6mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1678EUA-T | 生产中 | µMAX；8引脚；15.6mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
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