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MAX1678：1节至2节电池、低噪声、高效率、升压型DC-DC转换器

高效1节电池升压转换器，用于寻呼设备

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.

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

MAX1678：典型工作电路 应用 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

数据手册DataSheet

关键参数

开发工具

• MAX1678EVKIT

质量和环境数据

• MAX1678.pdf

订购型号