系统板 6880

MAXREFDES1214: Portable 1.5A USB Charger with Micro-USB Input and USB Standard-A Output


 Download Full Reference Design



Input Type VIN (MIN)
(V)
VIN (MAX)
(V)
IOUT
(A)
Single/Multiple
Output
VOUT
(V)
POUT
(W)
Isolated/Non-Isolated Topology
DC 4.2  1.5 Single 5.0 7.5  Non-Isolated  Boost

The MAXREFDES1214 is a portable USB charger that uses a lithium-ion (Li+) battery to charge a USB device from a USB Standard-A connector. The battery can be charged through Micro-USB. The MAXREFDES1214 is compliant with USB Battery Charger (BC) revision 1.2 on both USB ports. It has dynamic charger detection to automatically set the maximum charge current allowed to the battery based on the source’s capability. It also features a USB adapter emulator that supports Apple® 1A charging in addition to devices that are compliant with USB BC 1.2. For added flexibility, an I2C bus provides fault monitoring and shutdown capability for the buckboost regulator.

Key Features

  • Battery Charger Input Current up to 1A
  • USB Standard-A Output Current up to 1.5A
  • 4400mAh Li+ Battery
  • Thermal and Overcurrent Protection on the USB Standard-A Output
  • I2C Headers for Flexible Logic Levels from 1.8V to 5.0V
  • Orange LED to Indicate if the Battery Is Charging
  • No External Reverse Blocking Diode Required Between Battery and Charger
MAXREFDES1214 Board 放大+


This board is not available for purchase.

Designed, Built, Tested

This document describes the hardware shown above. It provides the design procedure for the MAXREFDES1214, including the USB detection and enumeration circuitry, Li+ battery charger, buck-boost converter, and logic-level translation. The design has been built and tested, details of which follow later in this document.

Design Resources

 
Status:
Package:
Temperature:

MAX77816
High-Efficiency Buck-Boost Regulator with 5A Switches

  • Buck and Boost Operation Including Seamless Transition between Buck and Boost Modes
  • I2C Serial Interface Allows Dynamic VOUT Adjustment and Provides Design Flexibility
  • 97.5% Peak Efficiency

MAX14632
USB充电器适配器仿真器

  • 优化用于充电适配器
  • 快速充电
  • 提高充电器的互操作能力

MAX14636
USB充电器检测器

  • 高度集成
  • 节省便携设备功耗
  • 节省空间

MAX14595
高速、漏极开路逻辑电平转换器

  • 满足工业标准
  • 提高设计灵活性
  • 超低功耗

MAX8891
高PSRR、低压差、150mA线性稳压器

  • 节省空间的SC70封装
  • 10kHz时具有65dB PSRR
  • 负载电流为120mA时压差仅为120mV

MAX8808X
1A、线性Li+电池充电器,在2mm x 2mm TDFN封装内集成了调整管FET和热调节电路

  • 单机、1节Li+电池线性充电器
  • 无需外部FET、反向阻塞二极管或电流检测电阻
  • 可编程快充电流(最大电流为1A)