LTC3456

• 产品介绍

LTC34562细胞，多输出DC / DC转换USB电源管理器

特点

• Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources 2个电池，USB和AC墙上适配器输入电源之间的无缝过渡
• Main Output: Fixed 3.3V Output 主要输出：3.3V固定输出
• Core Output: Adjustable from 0.8V to V _BATT(MIN) 核心输出：可调节从0.8V至V _{BATT小（最小）}
• Hot SwapTM Output for Memory Cards 记忆卡热SwapTM输出
• All Outputs Discharged to Ground During Shutdown 在关机期间，所有输出对地放电
• Power Supply Sequencing: Main and Hot Swap Outputs Come Up After Core Output 电源排序：主要和热插拔输出上来后核心输出
• Accurate USB Current Limiting 准确的USB电流限制
• High Frequency Operation: 1MHz高频率操作：1MHz的
• High Efficiency: Up to 92%高效率：高达92％
• Small (4mm × 4mm × 0.75mm) 24-Pin QFN Package小尺寸（4mm×4mm的×0.75毫米）24引脚QFN封装
• 描述 The LTC®3456 is a complete power management system IC optimized for a variety of portable applications. LTC®3456是一个完整的电源管理系统，为各种便携式应用优化的集成电路。 The device generates two separate power rails: a 3.3V (fixed) Main supply and a 1.8V (adjustable) Core supply.该装置产生两个独立的电源轨：一个3.3V（固定）主电源和一个1.8V（可调）的核心供应。 In addition, the LTC3456 contains a USB power manager, a Hot Swap output, a low-battery indicator and an alwaysalive V _MAX output.此外，LTC3456包含一个USB电源管理，热插拔输出，低电量指示灯和一个alwaysalive V _MAX输出。 The LTC3456 takes power from one of three sources: a Wall adapter, a USB port or a 2-cell Alkaline/NiCd/NiMH battery, in that order of priority. LTC3456采用功率从三个来源之一：墙上适配器，USB端口或2节碱性/镍镉/镍氢电池，在这样的优先顺序。 Current drawn from the USB port is accurately limited to 100mA or 500mA based on the state of the USBHP pin.准确地限制从USB端口吸取的电流为100mA或500mA的基础上的USBHP引脚的状态。

  The Main and Core switchers are all high efficiency, 1MHz fixed frequency PWM converters.主体和核心交换机都是高效率，1MHz的固定频率PWM变换器。 Availability in a small (4mm × 4mm × 0.75mm) 24-pin QFN package makes the LTC3456 ideal for space-sensitive portable devices.可用性（采用4mm x 4mm×0.75毫米）24引脚QFN封装，使LTC3456理想空间敏感的便携式设备。

• 应用

  • GPS Portable Navigators GPS便携式导航仪
  • MP3 Players MP3播放器
  • Digital Cameras数码相机
  • Handheld Computers掌上电脑