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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP73871 Datasheet

Stand-Alone System Load Sharing and Li-Ion / Li-Polymer Battery Charge Management Controller

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MCP73871
Stand-Alone System Load Sharing and Li-Ion / Li-Polymer
Battery Charge Management Controller
Features
• Integrated System Load Sharing and Battery
Charge Management
- Simultaneously Power the System and
Charge the Li-Ion Battery
- Voltage Proportional Current Control (VPCC)
ensures system load has priority over Li-Ion
battery charge current
- Low-Loss Power-Path Management with
Ideal Diode Operation
• Complete Linear Charge Management Controller
- Integrated Pass Transistors
- Integrated Current Sense
- Integrated Reverse Discharge Protection
- Selectable Input Power Sources: USB Port or
AC-DC Wall Adapter
• Preset High Accuracy Charge Voltage Options:
- 4.10V, 4.20V, 4.35V or 4.40V
- ±0.5% Regulation Tolerance
• Constant Current / Constant Voltage (CC/CV)
Operation with Thermal Regulation
• Maximum 1.8A Total Input Current Control
• Resistor Programmable Fast Charge Current
Control: 50 mA to 1A
• Resistor Programmable Termination Set Point
• Selectable USB Input Current Control
- Absolute Maximum: 100 mA (L) / 500 mA (H)
• Automatic Recharge
• Automatic End-of-Charge Control
• Safety Timer With Timer Enable/Disable Control
• 0.1C Preconditioning for Deeply Depleted Cells
• Battery Cell Temperature Monitor
• Undervoltage Lockout (UVLO)
• Low Battery Status Indicator (LBO)
• Power-Good Status Indicator (PG)
• Charge Status and Fault Condition Indicators
• Numerous Selectable Options Available for a
Variety of Applications:
- Refer to Section 1.0 “Electrical
Characteristics” for Selectable Options”
- Refer to the “Product Identification
System” for Standard Options
• Temperature Range: -40°C to +85°C
• Packaging: 20-Lead QFN (4 mm x 4 mm)
Applications
• GPSs / Navigators
• PDAs and Smart Phones
• Portable Media Players and MP3 Players
• Digital Cameras
• Bluetooth Headsets
• Portable Medical Devices
• Charge Cradles / Docking Stations
• Toys
Description
The MCP73871 device is a fully integrated linear
solution for system load sharing and Li-Ion / Li-Polymer
battery charge management with ac-dc wall adapter
and USB port power sources selection. It’s also
capable of autonomous power source selection
between input or battery. Along with its small physical
size, the low number of required external components
makes the device ideally suited for portable
applications.
The MCP73871 device automatically obtains power for
the system load from a single-cell Li-Ion battery or an
input power source (ac-dc wall adapter or USB port).
The MCP73871 device specifically adheres to the
current drawn limits governed by the USB specification.
With an ac-dc wall adapter providing power to the
system, an external resistor sets the magnitude of 1A
maximum charge current while supports up to 1.8A
total current for system load and battery charge
current.
The MCP73871 device employs a constant current /
constant voltage (CC/CV) charge algorithm with
selectable charge termination point. The constant
voltage regulation is fixed with four available options:
4.10V, 4.20V, 4.35V, or 4.40V to accommodate new,
emerging battery charging requirements. The
MCP73871 device also limits the charge current based
on die temperature during high power or high ambient
conditions. This thermal regulation optimizes the
charge cycle time while maintaining device reliability.
The MCP73871 device includes a low battery indicator,
a power-good indicator and two charge status
indicators that allows for outputs with LEDs or
communication with host microcontrollers. The
MCP73871 device is fully specified over the ambient
temperature range of -40°C to +85°C.
© 2009 Microchip Technology Inc.
www.DataSheet.in
DS22090B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP73871 Datasheet

Stand-Alone System Load Sharing and Li-Ion / Li-Polymer Battery Charge Management Controller

No Preview Available !

MCP73871
Package Types
MCP73871
20-Lead QFN
20 19 18 17 16
OUT 1
VPCC 2
SEL 3
PROG2 4
15 VBAT
EP 14 VBAT
21 13 PROG1
12 PROG3
THERM 5
11 VSS
6 7 8 9 10
Typical Application Circuit
Ac-dc Adapter
or
USB Port
10 µF
MCP73871 Typical Application
18, 19
IN
2
VPCC
470Ω
6
PG
470Ω 7 STAT2
Low Hi
Low Hi
Low Hi
Low Hi
470Ω
8 STAT1
LBO
3
SEL
4
PROG2
9 TE
17
CE
1, 20
OUT
4.7 µF
VBAT 14, 15, 16
4.7 µF
THERM 5 NTC
10 kΩ
PROG1 13 RPROG1
PROG3 12 RPROG3
VSS 10, 11, EP
System
Load
Single-Cell
Li-Ion Battery
DS22090B-page 2
www.DataSheet.in
© 2009 Microchip Technology Inc.


Part Number MCP73871
Description Stand-Alone System Load Sharing and Li-Ion / Li-Polymer Battery Charge Management Controller
Maker Microchip Technology
Total Page 30 Pages
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