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MCP73837/8 AC/USB EVALUATION
BOARD USER ’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board demonstrates
the features and abilities of Microchip’s MCP73837 and MCP73838 Single-Chip Linear
Li-Ion Battery Charger with Autonomous AC Adapter or USB-Port Power Source
Selection. The MCP73837 and MCP73838 are stand-alone highly integrated linear
battery charger management controllers which employ a constant current / constant
voltage (CCCV) charge algorithm with selectable preconditioning and charge
termination ratio.
The MCP73837 and MCP73838 automatically select the AC-Adapter or USB-Port as
the power source for the system. For an AC-Adapter powered system, an external
resistor (R PROG ) sets the magnitude of the charge current up to a maximum of 1000
mA. With an USB-port providing power to the system, the MCP73837/8 specifically
adheres to the current limits governed by the USB specification. The host microcontrol-
ler can select from two preset charge current rates of typical 90 mA (low) or 450 mA
(High) and will not exceed 100 mA (Low) or 500 mA (high) maximum charge current.
As for USB regulation, a device may draw either low-power at one unit load or
high-power at 5 unit loads. A unit load is defined to be 100 mA. The drawn current per
unit load is an absolute maximum value, not an average over time.
This chapter covers the following topics:
? What is the MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board?
? What the MCP73837/8 AC/USB Dual Input Battery Charger Evaluation Board Kit
includes.
V IN_AC Adapter
4.7 μF
V IN_USB Port
1
2
V AC
V USB
V BAT
THERM
10
Thermistor
9
4.7 μF
Single
Li-Ion
Cell
4.7 μF
V IN_AC or USB
3
STAT1
PG
8
V IN_AC or USB
V IN_AC or USB
4
STAT2
PROG2
7
Low
Hi
5
V SS
PROG1
6
FIGURE 1-1:
? 2007 Microchip Technology Inc.
MCP73837 Typical Application.
DS51684A-page 5
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相关代理商/技术参数
MCP7383XRD-PPM 功能描述:电源管理IC开发工具 LI-ION SYS PWR PATH MGT REF Design RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MCP73841 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers
MCP73841_13 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers
MCP73841-410I/MS 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers
MCP73841-410I/UN 功能描述:电池管理 w/ Ch Sfty & Temp Mn RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MCP73841-420I/MS 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers
MCP73841-420I/UN 功能描述:电池管理 w/ Ch Sfty & Temp Mn RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MCP73841-820I/MS 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers