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PDA手持计算机电源控制器

系统级供电方案,用于亚笔记本电脑和PDA

产品详情

主要特征

简化框图

Technical Docs

数据资料 PDA手持计算机电源控制器 Jul 01, 1994

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主要特征

  • +3.3V Step-Down Controller
  • Dual PCMCIA 2.0 Compatible VPP Outputs (0V/3.3V/5V/12V)
  • Digitally Adjustable Switching Current Source for Battery Charging
  • 5 High-Side Switch Gate-Driver Outputs
  • SPI Serial Interface
  • 300kHz Switching Frequency
  • Oscillator SYNC Input
  • 2.5V ±1.5% Reference Output
  • 36-Pin SSOP Package

应用/用途

  • 通信系统
  • 手持终端
  • PDA
  • 亚笔记本电脑

描述

The MAX781 is a system-engineered power-supply controller for subnotebook computers, PDAs, or similar battery-powered equipment. It provides high-performance, step-down (buck), pulse-width modulated (PWM) control for generating +3.3V and constant-current battery charging. Dual PCMCIA VPP outputs are powered by a regulated flyback winding. Five high-side gate drivers and a buffered analog multiplexer are also included. All functions are controlled by an SPI/Microwire™ compatible four-wire serial interface.

The MAX781 generates +3.3V with high efficiency through synchronous rectification and PWM operation at heavy loads. It uses Idle Mode™ operation at light loads. Only small external components are required because of the device's high switching frequency (300kHz) and advanced current-mode PWM architecture that allows for output capacitance as low as 50µF per ampere of load.

The MAX781 is configured by 32 bits of serial data. These bits select the operating mode, set the switch-mode battery charger current level, select one of eight analog multiplexer channels, and turn on/off the five high-side gate drivers. A status byte read from the serial interface indicates if the battery has been removed, if the DC charging source has been connected, or if there is a fault condition on the +3.3V output. An interrupt output signals the CPU if a status signal changes.

简化框图

MAX781:典型应用电路 MAX781:典型应用电路 Zoom icon

Technical Docs

数据资料 PDA手持计算机电源控制器 Jul 01, 1994

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心