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MCP73123/223
Lithium Iron Phosphate (LiFePO4) 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)
Applications
• Low-Cost LiFePO4 Battery Chargers
• Power Tools
• Toys
• Backup Energy Storages
Description
The MCP73123/223 is a highly integrated Lithium Iron
Phosphate(LiFePO4) battery charge management
controller for use in space-limited and cost-sensitive
applications. The MCP73123/223 provides specific
charge algorithms for LiFePO4 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 *
VDD 1
VDD 2
VBAT 3
VBAT 4
NC 5
10 PROG
9 VSS
EP
11
8 VSS
7 STAT
6 NC
* Includes Exposed Thermal Pad (EP); see Table 3-1.
© 2010 Microchip Technology Inc.
DS22191B-page 1

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MCP73123/223
Typical Application
Ac-dc Adapter
4.7 µF
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MCP73123 Typical Application
1 kΩ
1
VDD
2 VDD
7
STAT
5 NC
6 NC
3
VBAT
VBAT 4
PROG 10
VSS 9
VSS 8
4.7 µF
1.15 kΩ
+
1-Cell
LiFePO4
Battery
-
TABLE 1: AVAILABLE FACTORY PRESET OPTIONS
Charge
Voltage
OVP
Pre-
conditioning
Charge Current
Pre-
conditioning
Threshold
Precondition
Timer
Elapse
Timer
End-of-
Charge
Control
3.6V
6.5V Disable / 10%
2V Disable / Disable / 4 HR / 5% / 7.5% /
32 Minimum 6 HR / 8 HR 10% / 20%
7.2V
13V Disable / 10%
4V Disable / Disable / 4 HR / 5% / 7.5% /
32 Minimum 6 HR / 8 HR 10% / 20%
Note
1:
2:
3:
4:
5:
6:
IREG: Regulated fast charge current.
VREG: Regulated charge voltage.
IPREG/IREG: Preconditioning charge current; ratio of regulated fast charge current.
ITERM/IREG: End-of-Charge control; ratio of regulated fast charge current.
VRTH/VREG: Recharge threshold; ratio of regulated battery voltage.
VPTH/VREG: Preconditioning threshold voltage
Automatic
Recharge
No /
Yes
No /
Yes
Output
Status
Type 1 /
Type 2
Type 1 /
Type 2
TABLE 2: STANDARD SAMPLE OPTIONS
Part
Number
VREG
OVP IPREG/IREG Pre-charge Elapse ITERM/IREG VRTH/VREG VPTH/VREG Output
Timer
Timer
Status
MCP73123-22S/MF 3.6V 6.5V
10%
32 Min.
6 HR
10%
95%
2V Type 1
MCP73223-C2S/MF 7.2V 13V
10%
32 Min.
6 HR
10%
95%
4V Type 1
Note 1: Customers should contact their distributor, representatives or field application engineer (FAE) for support and sample.
Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of
this document. Technical support is available through the web site at: http//support.microchip.com
DS22191B-page 2
© 2010 Microchip Technology Inc.

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Functional Block Diagram
MCP73123/223
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Direction
Control
VDD
VOREG
VREF
Current
+ Limit
-
VBAT
PROG
Reference,
Bias, UVLO,
VREF (1.21V)
and SHDN
VOREG
UVLO
Term
+
-
Precondition
+ CA
-
STAT
Charge
Control,
Timer,
and
Status
Logic
Charge
6.5V / 13V
VDD
Input OverVP
110°C
TSD
Thermal Regulation
+ VA
-
VSS
95% VREG
VBAT
*Recharge
*Only available on selected options
© 2010 Microchip Technology Inc.
DS22191B-page 3

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MCP73123/223
NOTES:
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DS22191B-page 4
© 2010 Microchip Technology Inc.

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MCP73123/223
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
VDD ................................................................................18.0V
VPROG ..............................................................................6.0V
All Inputs and Outputs w.r.t. VSS ............... -0.3 to (VDD+0.3)V
Maximum Junction Temperature, TJ ............ Internally Limited
Storage temperature .....................................-65°C to +150°C
ESD protection on all pins
Human Body Model (1.5 kΩ in Series with 100 pF).......≥ 4 kV
Machine Model (200pF, No Series Resistance) ..............300V
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† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(Typical) + 0.3V] to 12V,
TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (Typical) + 1.0V]
Parameters
Sym Min Typ Max Units
Conditions
Supply Input
Input Voltage Range
VDD
4
16 V
Operating Supply Voltage
VDD
4.2
6.5 V MCP73123
Operating Supply Voltage
VDD
4.2
13.0 V MCP73223
Supply Current
ISS — 4 5.5 µA Shutdown (VDD VBAT - 150 mV)
700
1500
µA Charging
— 30 100 µA Standby (PROG Floating)
Battery Discharge Current
— 50 150 µA Charge Complete; No Battery;
VDD < VSTOP
Output Reverse Leakage
Current
IDISCHARGE
0.5
0.5
2 µA Standby (PROG Floating)
2 µA Shutdown (VDD VBAT,
or VDD < VSTOP)
Undervoltage Lockout
— 6 17 µA Charge Complete; VDD is present
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
Overvoltage Protection
VSTART
VSTOP
VHYS
4.10
4.00
4.15
4.05
100
4.25 V
4.15 V
— mV
OVP Start Threshold
VOVP
6.4
OVP Start Threshold
VOVP
12.8
OVP Hysteresis
VOVPHYS
Voltage Regulation (Constant Voltage Mode)
6.5
13
150
6.6
13.2
V MCP73123
V MCP73223
mV
Regulated Output Voltage
VREG
3.582
3.60
3.618
V TA= -5°C to +55°C, IOUT = 50 mA
- MCP73123
Output Voltage Tolerance
Regulated Output Voltage
VRTOL
VREG
-0.5
7.157
7.20
+0.5
7.243
% TA= -5°C to +55°C
V TA= -5°C to +55°C, IOUT = 50 mA
- MCP73123
Output Voltage Tolerance
Line Regulation
VRTOL
|(ΔVBAT/
VBAT)/ΔVDD|
-0.6
0.05
Load Regulation
VBAT/VBAT|
Note 1: Not production tested. Ensured by design.
0.05
+0.6
0.20
0.20
% TA= -5°C to +55°C
%/V VDD = [VREG(Typical)+1V] to 6V
- MCP73123
VDD = [VREG(Typical)+1V] to 12V
- MCP73223
IOUT = 50 mA
% IOUT = 50 mA - 150 mA
VDD = [VREG(Typical)+1V]
© 2010 Microchip Technology Inc.
DS22191B-page 5