MAX1677 - 紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器

MAX1677是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1677是紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器，本站介绍了MAX1677的封装应用图解、特点和优点、功能等，并给出了与MAX1677相关的Maxim元器件型号供参考。

MAX1677 - 紧凑的、高效率、双输出、升压型和LCD偏置DC-DC转换器 - DC-DC开关调节器 - 逻辑电路与LCD电源方案，仅消耗35µA的电源电流，外部元件数最少 - 美信半导体

产品概述

The MAX1677 is a compact, high-efficiency, dual-output boost converter for portable devices needing two regulated supplies, typically for logic and liquid crystal displays (LCDs). Operation with inputs as low as 0.7V allows the MAX1677 to accept 1, 2, or 3-cell alkaline, NiCd, or NiMH batteries as well as 1-cell lithium-ion batteries. The device requires no external FETs and can maintain regulation while consuming only 20µA, making it ideal for hand-held pen-input and PDA devices operating with low-current "sleep" states.

The MAX1677's primary regulator supplies up to 350mA at either a factory-preset 3.3V or an adjustable 2.5V to 5.5V output. On-chip synchronous rectification provides efficiencies up to 95%. 300kHz (or externally clocked) pulse-width-modulation (PWM) operation is particularly suitable for applications needing low noise, such as those with wireless features. The primary converter also features pin-selectable pulse-frequency-modulation (PFM) operation that consumes only 20µA. A 1µA shutdown state also minimizes battery drain.

The MAX1677's secondary step-up converter supplies up to +28V or -28V for LCD bias, varactor tuning, or other high-voltage, low-current functions. Other MAX1677 features include precision reference, logic control inputs for both regulators, and an uncommitted comparator for low-battery detection or a reset function. The MAX1677 is supplied in Maxim's compact 16-pin QSOP package, which occupies no more space than a standard SO-8.

关键特性

以下关键特性由Maxim美信半导体提供：

No External FETs Required

Main Output

Up to 350mA for Logic Supply

Fixed 3.3V or Adjustable (2.5V to 5.5V)

Synchronous Rectification for High Efficiency (up to 95%)

300kHz (200kHz to 400kHz Synchronizable)

Fixed-Frequency PWM Operation

Secondary Output

Up to +28V or -28V for LCD Bias

Programmable Current Limit

0.7V to 5.5V Input Voltage Range

20µA Quiescent Current

1µA Shutdown Current

Low-Battery Comparator

Small 16-Pin QSOP Package

热门应用

手持式终端

PDA

便携式仪表

便携电话

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