MCP73871
Stand-Alone System Load Sharing and Li-Ion / Li-Polymer
Battery Charge Management Controller
Features Applications
Integrated System Load Sharing and Battery GPSs / Navigators
Charge Management
PDAs and Smart Phones
- Simultaneously Power the System and
Portable Media Players and MP3 Players
Charge the Li-Ion Battery
Digital Cameras
- Voltage Proportional Current Control (VPCC)
Bluetooth Headsets
ensures system load has priority over Li-Ion
Portable Medical Devices
battery charge current
Charge Cradles / Docking Stations
- Low-Loss Power-Path Management with
Toys
Ideal Diode Operation
Complete Linear Charge Management Controller
Description
- Integrated Pass Transistors
- Integrated Current Sense The MCP73871 device is a fully integrated linear
solution for system load sharing and Li-Ion / Li-Polymer
- Integrated Reverse Discharge Protection
battery charge management with ac-dc wall adapter
- Selectable Input Power Sources: USB Port or
and USB port power sources selection. Its also
AC-DC Wall Adapter
capable of autonomous power source selection
Preset High Accuracy Charge Voltage Options:
between input or battery. Along with its small physical
- 4.10V, 4.20V, 4.35V or 4.40V
size, the low number of required external components
- 0.5% Regulation Tolerance
makes the device ideally suited for portable
applications.
Constant Current / Constant Voltage (CC/CV)
Operation with Thermal Regulation
The MCP73871 device automatically obtains power for
Maximum 1.8A Total Input Current Control the system load from a single-cell Li-Ion battery or an
Resistor Programmable Fast Charge Current input power source (ac-dc wall adapter or USB port).
The MCP73871 device specifically adheres to the
Control: 50 mA to 1A
current drawn limits governed by the USB specification.
Resistor Programmable Termination Set Point
With an ac-dc wall adapter providing power to the
Selectable USB Input Current Control
system, an external resistor sets the magnitude of 1A
- Absolute Maximum: 100 mA (L) / 500 mA (H)
maximum charge current while supports up to 1.8A
Automatic Recharge
total current for system load and battery charge
Automatic End-of-Charge Control current.
Safety Timer With Timer Enable/Disable Control
The MCP73871 device employs a constant current /
0.1C Preconditioning for Deeply Depleted Cells constant voltage (CC/CV) charge algorithm with select-
able charge termination point. The constant voltage
Battery Cell Temperature Monitor
regulation is fixed with four available options: 4.10V,
Undervoltage Lockout (UVLO)
4.20V, 4.35V, or 4.40V to accommodate new, emerging
Low Battery Status Indicator (LBO)
battery charging requirements. The MCP73871 device
)
Power-Good Status Indicator (PG
also limits the charge current based on die temperature
Charge Status and Fault Condition Indicators during high power or high ambient conditions. This
Numerous Selectable Options Available for a thermal regulation optimizes the charge cycle time
while maintaining device reliability.
Variety of Applications:
- Refer to Section 1.0 Electrical
The MCP73871 device includes a low battery indicator,
Characteristics for Selectable Options
a power-good indicator and two charge status indica-
tors that allows for outputs with LEDs or communica-
- Refer to the Product Identification
tion with host microcontrollers. The MCP73871 device
System for Standard Options
is fully specified over the ambient temperature range of
Temperature Range: -40C to 85C
-40C to +85C.
Packaging: 20-Lead QFN (4 mm x 4 mm)
2008 Microchip Technology Inc. DS22090A-page 1MCP73871
Package Types
MCP73871
20-Lead QFN
20 19 18 17 16
OUT 1 15 V
BAT
VPCC 2 14 V
EXPOSED
BAT
PAD
SEL 3 13 PROG1
V
SS
PROG2 4 12
PROG3
THERM511 V
SS
678 9 10
Typical Application Circuit
MCP73871 Typical Application
Ac-dc Adapter
or
USB Port
18, 19 1, 20
System
IN OUT
Load
10 F 4.7 F
2
VPCC
14, 15, 16
V
BAT
470
6
4.7 F
PG
NTC
470 THERM 5
7
STAT2
10 k
470
8
Single-Cell
STAT1
PROG1 R
PROG1
Li-Ion Battery
13
LBO
3
SEL
Hi
Low
R
4 12 PROG3
PROG3
PROG2
Hi
Low
9
TE
Hi
Low
17 V 10, 11, EP
SS
CE
Hi
Low
DS22090A-page 2 2008 Microchip Technology Inc.
OUT
PG
STAT2 IN
STAT1 / LBO
IN
TE CE
V
SS V
BAT_SENSE