MCP73871 DEMO BOARD WITH
VOLTAGE PROPORTIONAL
CURRENT CONTROL USER’S GUIDE
©
2009 Microchip Technology Inc.
DS51812B-page 9
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP73871 Demo Board with Voltage Proportional Current Control is designed to
demonstrate Microchip's stand-alone linear Li-Ion battery charger with system power
path and load sharing management control solution. The MCP73871 integrates the
required elements to meet design challenges when developing new Li-Ion / Li-Polymer
batteries powered products.
The MCP73871 requires minimum external components to power the system load and
charge single cell Li-Ion batteries independently. When input power is absent or
insufficient, the Li-Ion battery becomes the primary power source and supports the
required system load current. The MCP73871 Demo Board with Voltage Proportional
Current Control feature added is developed to assist engineers in reducing product
design cycle and time by utilizing Microchip’s favorite stand-alone Li-Ion battery
charger and system load sharing management controller.
This chapter provides an overview of the MCP73871 Demo Board with Voltage
Proportional Current Control and covers the following topics:
• What is the MCP73871 Demo Board with Voltage Proportional Current Control?
• What the MCP73871 Demo Board with Voltage Proportional Current Control Kit
includes?
FIGURE 1-1:
MCP73871 With System Power Path and Voltage Proportional Current Control
(VPCC) Management Typical Application.
System
Load
Low Hi
Low Hi
Low Hi
Low Hi
17
CE
V
SS
IN
PG
STAT2
SEL
STAT1
VPCC
PROG2
TE
LBO
Single-Cell
Li-Ion
Battery
OUT
V
BAT
THERM
V
BAT_SENSE
PROG3
PROG1
9
4
1, 20
14, 15, 16
18, 19
6
7
8
2
3
13
10,11 (EP)
12
5
OUT
NTC
10
μ
F
4.7
μ
F
4.7
μ
F
110 k
Ω
10 k
Ω
R
PROG3
R
PROG1
470
Ω
470
Ω
470
Ω
AC-DC Adapter
or USB Port
MCP73871
330 k
Ω
