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 (OVP)
- 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)
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 AC adapter or voltage
spikes from plugging/unplugging.
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
the 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
Backup Energy Storage Solutions
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
2009-2013 Microchip Technology Inc.
DS22191E-page 1
MCP73123/223
Typical Application
MCP73123 Typical Application
AC-DC Adapter
1
V
DD
V
BAT
V
BAT
PROG
3
4
4.7 µF
7
STAT
1 k
5 NC
6 NC
V
SS
9
1.15 k
-
10
1-Cell
LiFePO
4
Battery
2 V
DD
4.7 µF
+
V
SS
8
TABLE 1:
Charge
Voltage
3.6V
7.2V
Note 1:
2:
3:
4:
5:
6:
7:
OVP
6.5V
13V
AVAILABLE FACTORY PRESET OPTIONS
Preconditioning
Charge Current
Disable/10%
Disable/10%
Preconditioning
Threshold
2V
4V
Precondition
Timer
Disable /
32 Minimum
Disable /
32 Minimum
Elapse
Timer
Disable/4 hr./
6 hr./8 hr.
Disable/4 hr./
6 hr./8 hr.
End-of-
Charge
Control
5%/7.5%/
10%/20%
5%/7.5%/
10%/20%
Automatic
Recharge
No /
Yes
No /
Yes
Output
Status
Type 1/
Type 2
Type 1/
Type 2
I
REG
: Regulated fast charge current.
V
REG
: Regulated charge voltage.
I
PREG
/I
REG
: Preconditioning charge current; ratio of regulated fast charge current.
I
TERM
/I
REG
: End-of-Charge control; ratio of regulated fast charge current.
V
RTH
/V
REG
: Recharge threshold; ratio of regulated battery voltage, 0% or 95%. 0% = Disabled.
V
PTH
/V
REG
: Preconditioning threshold voltage.
Type 1: On/Off; Type 2: Flashing. Please refer to
Table 5-2.
TABLE 2:
Part
Number
STANDARD SAMPLE OPTIONS
V
REG
OVP
I
PREG
/I
REG
Precharge
Timer
32 Min.
32 Min.
32 Min.
32 Min.
Elapse
Timer
6 hr.
6 hr.
6 hr.
6 hr.
I
TERM
/I
REG
Auto Recharge
Threshold
(0% = Disabled)
95%
0%
95%
0%
V
PTH
/V
REG
Output
Status
Type 1
Type 1
Type 1
Type 1
MCP73123-22S/MF
MCP73123-22A/MF
MCP73223-C2S/MF
MCP73223-C2A/MF
Note 1:
3.6V
3.6V
7.2V
7.2V
6.5V
6.5V
13V
13V
10%
10%
10%
10%
10%
10%
10%
10%
2V
2V
4V
4V
2:
Customers should contact their distributor, representatives or field application engineer (FAE) for support and samples.
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.
Contact your local Microchip sales office for alternative device options.
DS22191E-page 2
2009-2013 Microchip Technology Inc.
MCP73123/223
Functional Block Diagram
VOREG
DIRECTION
CONTROL
VDD
CURRENT
LIMIT
VBAT
+
VREF
-
G=0.001
PROG
+
-
CA
REFERENCE,
BIAS, UVLO,
AND SHDN
VOREG
VREF (1.21V)
UVLO
-
TERM
-
+
-
PRECONDITION
+
STAT
CHARGE
CONTROL,
TIMER,
AND
STATUS
LOGIC
CHARGE
+
-
VA
Input OverVP
TSD
*Recharge
*Only available on selected options
Thermal Regulation
2009-2013 Microchip Technology Inc.
+
110 C
-
-
+
-
+
+
6.5V/13V
VDD
95% VREG
VBAT
VSS
DS22191E-page 3
MCP73123/223
1.0
ELECTRICAL
CHARACTERISTICS
† 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.
Absolute Maximum Ratings†
V
DD
................................................................................18.0V
V
PROG
..............................................................................6.0V
All Inputs and Outputs w.r.t. V
SS
............... -0.3 to (V
DD
+0.3)V
Maximum Junction Temperature, T
J
............Internally Limited
Storage temperature .....................................-65°C to +150°C
ESD protection on all pins
Human Body Model (1.5 k in Series with 100 pF)
4
kV
Machine Model (200pF, No Series Resistance) ..............300V
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(Typical) + 0.3V] to 12V,
T
A
= -40°C to +85°C. Typical values are at +25°C, V
DD
= [V
REG
(Typical) + 1.0V]
Parameters
Supply Input
Input Voltage Range
Operating Supply Voltage
Operating Supply Voltage
Supply Current
V
DD
V
DD
V
DD
I
SS
4
4.2
4.2
—
—
—
—
Battery Discharge Current
Output Reverse Leakage
Current
I
DISCHARGE
—
—
—
Undervoltage Lockout
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
Overvoltage Protection
OVP Start Threshold
OVP Start Threshold
OVP Hysteresis
V
OVP
V
OVP
V
OVPHYS
V
REG
V
RTOL
V
REG
V
RTOL
6.4
12.8
—
6.5
13
150
6.6
13.2
—
V
V
mV
MCP73123
MCP73223
V
START
V
STOP
V
HYS
4.10
4.00
—
4.15
4.05
100
4.25
4.15
—
V
V
mV
0.5
0.5
6
2
2
17
µA
µA
µA
Standby (PROG Floating)
Shutdown (V
DD
V
BAT
,
or V
DD
V
STOP
)
Charge Complete; V
DD
is present
—
—
—
4
700
30
50
16
6.5
13.0
5.5
1500
100
150
V
V
V
µA
µA
µA
µA
MCP73123
MCP73223
Shutdown (V
DD
V
BAT
- 150 mV)
Charging
Standby (PROG Floating)
Charge Complete; No Battery;
V
DD
V
STOP
Sym.
Min.
Typ.
Max.
Units
Conditions
Voltage Regulation (Constant Voltage Mode)
Regulated Output Voltage
Output Voltage Tolerance
Regulated Output Voltage
Output Voltage Tolerance
Note 1:
3.582
-0.5
7.157
-0.6
3.60
—
7.20
—
3.618
+0.5
7.243
+0.6
V
%
V
%
T
A
= -5°C to +55°C, I
OUT
= 50 mA
- MCP73123
T
A
= -5°C to +55°C
- MCP73123
T
A
= -5°C to +55°C, I
OUT
= 50 mA
- MCP73223
T
A
= -5°C to +55°C
- MCP73223
Not production tested. Ensured by design.
DS22191E-page 4
2009-2013 Microchip Technology Inc.
MCP73123/223
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(Typical) + 0.3V] to 12V,
T
A
= -40°C to +85°C. Typical values are at +25°C, V
DD
= [V
REG
(Typical) + 1.0V]
Parameters
Line Regulation
Sym.
V
BAT
/
V
BAT
)/V
DD
|
Min.
—
Typ.
0.05
Max.
0.20
Units
%/V
Conditions
V
DD
= [V
REG
(Typical)+1V] to 6V
- MCP73123
V
DD
= [V
REG
(Typical)+1V] to 12V
- MCP73223
I
OUT
= 50 mA
I
OUT
= 50 mA - 150 mA
V
DD
= [V
REG
(Typical)+1V]
I
OUT
= 20 mA, 10 Hz to 1 kHz
I
OUT
= 20 mA, 10 Hz to 10 kHz
MCP73123
MCP73223
Load Regulation
Supply Ripple Attenuation
Battery Short Protection
BSP Start Threshold
BSP Start Threshold
BSP Hysteresis
BSP Regulation Current
V
BAT
/V
BAT
|
PSRR
—
—
—
0.05
-46
-30
0.20
—
—
%
dB
dB
V
SHORT
V
SHORT
V
BSPHYS
I
SHORT
I
REG
—
—
—
—
1.45
2.90
150
25
—
—
—
—
V
V
mV
mA
Current Regulation (Fast Charge, Constant-Current Mode)
Fast Charge Current
Regulation
130
—
—
—
130
1000
1100
—
—
mA
mA
mA
T
A
=-5°C to +55°C
PROG = 10 k
PROG = 1.1 k
Preconditioning Current Regulation (Trickle Charge Constant Current Mode)
Precondition Current Ratio
I
PREG/
/I
REG
—
—
Precondition Voltage
Threshold Ratio
Precondition Hysteresis
Charge Termination
Charge Termination
Current Ratio
I
TERM
/I
REG
3.7
5.6
7.5
15
Automatic Recharge
Recharge Voltage
Threshold Ratio
V
RTH
/V
REG
93
—
95
0
97
—
%
V
BAT
High-to-Low
No Automatic Recharge
5
7.5
10
20
6.3
9.4
12.5
25
%
PROG = 1 kto 10 k
T
A
=-5°C to +55°C
V
PTH
V
PTH
V
PHYS
1.9
3.8
—
10
100
2.0
4.0
100
—
—
2.1
4.2
—
%
%
V
V
mV
PROG = 1 kto 10 k
T
A
=-5°C to +55°C
No Preconditioning
MCP73123, V
BAT
Low-to-High
MCP73223, V
BAT
Low-to-High
V
BAT
High-to-Low
(Note
1)
Pass Transistor ON-Resistance
ON-Resistance
Status Indicator - STAT
Sink Current
Low Output Voltage
Input Leakage Current
PROG Input
Charge Impedance Range
Shutdown Impedance
PROG Voltage Range
Note 1:
R
PROG
R
PROG
V
PROG
1
—
0
—
200
—
10
—
5
k
k
V
Impedance for Shutdown
I
SINK
V
OL
I
LK
—
—
—
20
0.2
0.001
35
0.5
1
mA
V
A
I
SINK
= 4 mA
High Impedance, V
DD
on pin
R
DSON
—
350
—
m
V
DD
= 4.5V, T
J
= 105°C
(Note
1)
Not production tested. Ensured by design.
2009-2013 Microchip Technology Inc.
DS22191E-page 5
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