MCP73123/223
Lithium Iron Phosphate (LiFePO
4
) Battery Charge
Management Controller with Input Overvoltage Protection
Features
• Complete Linear Charge Management Controller:
- Integrated Input Overvoltage Protection
- Integrated Pass Transistor
- Integrated Current Sense
- Integrated Reverse Discharge Protection
• Constant Current / Constant Voltage Operation
with Thermal Regulation
• 4.15V Undervoltage Lockout (UVLO)
• 18V Absolute Maximum Input with OVP:
- 6.5V - MCP73123
- 13V - MCP73223
• High Accuracy Preset Voltage Regulation
Through Full Temperature Range (-5°C to +55°C):
- + 0.5% - MCP73123
- + 0.6% - MCP73223
• Battery Charge Voltage Options:
- 3.6V - MCP73123
- 7.2V - MCP73223
• Resistor Programmable Fast Charge Current:
- 130 mA - 1100 mA
• Preconditioning of Deeply Depleted Cells:
- Available Options: 10% or Disable
• Integrated Precondition Timer:
- 32 Minutes or Disable
• Automatic End-of-Charge Control:
- Selectable Minimum Current Ratio:
5%, 7.5%, 10% or 20%
- Elapse Safety Timer: 4 HR, 6 HR, 8 HR or
Disable
• Automatic Recharge:
- Available Options: 95% or Disable
• Factory Preset Charge Status Output:
- On/Off or Flashing
• Soft Start
• Temperature Range: -40°C to +85°C
• Packaging: DFN-10 (3 mm x 3 mm)
• Backup Energy Storages
Description
The MCP73123/223 is a highly integrated Lithium Iron
Phosphate(LiFePO
4
) battery charge management
controller for use in space-limited and cost-sensitive
applications. The MCP73123/223 provides specific
charge algorithms for LiFePO
4
batteries to achieve
optimal capacity and safety in the shortest charging
time possible. Along with its small physical size, the low
number of external components makes the
MCP73123/223
ideally
suitable
for
various
applications. The absolute maximum voltage, up to
18V, allows the use of MCP73123/223 in harsh
environments, such as low cost wall wart or voltage
spikes from plug/unplug.
The MCP73123/223 employs a constant current /
constant voltage charge algorithm. The 3.6V per cell
factory preset reference voltage simplifies design with
2V preconditioning threshold. The fast charge,
constant current value is set with one external resistor
from 130 mA to 1100 mA. The MCP73123/223 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 PROG pin of the MCP73123/223 also serves as
enable pin. When high impedance is applied, the
MCP73123/223 will be in standby mode.
The MCP73123/223 is fully specified over the ambient
temperature range of -40°C to +85°C. The MCP73123/
223 is available in a 10 lead, DFN package.
Package Types (Top View)
MCP73123/223
3x3 DFN *
V
DD
1
V
DD
2
V
BAT
3
V
BAT
4
NC 5
EP
11
10 PROG
9 V
SS
8 V
SS
7 STAT
6 NC
Applications
• Low-Cost LiFePO
4
Battery Chargers
• Power Tools
• Toys
* Includes Exposed Thermal Pad (EP); see
©
2009 Microchip Technology Inc.
DS22191A-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
