MCP73861/2/3/4
Advanced Single or Dual Cell, Fully Integrated Li-Ion/Li-Polymer
Charge Management Controllers
Features:
Description:
• Linear Charge Management Controllers:
- Integrated Pass Transistor
- Integrated Current Sense
- Reverse-Blocking Protection
• High-Accuracy Preset Voltage Regulation: + 0.5%
• Four Selectable Voltage Regulation Options:
- 4.1V, 4.2V – MCP73861/3
- 8.2V, 8.4V – MCP73862/4
• Programmable Charge Current: 1.2A Maximum
• Programmable Safety Charge Timers
• Preconditioning of Deeply Depleted Cells
• Automatic End-of-Charge Control
• Optional Continuous Cell Temperature Monitoring
• Charge Status Output for Direct LED Drive
• Fault Output for Direct LED Drive
• Automatic Power-Down
• Thermal Regulation
• Temperature Range: -40°C to +85°C
• Packaging: 16-Pin, 4 x 4 QFN
16-Pin SOIC
The MCP7386X family of devices features highly
advanced linear charge management controllers for
use in space-limited, cost-sensitive applications. The
devices combine high-accuracy, constant voltage and
current
regulation,
cell
preconditioning,
cell
temperature monitoring, advanced safety timers,
automatic charge termination, internal current sensing,
reverse-blocking protection, charge status and fault
indication in either a space-saving 16-pin 4 x 4 QFN
package, or a 16-pin SOIC package. The MCP7386X
provides a complete, fully functional, stand-alone
charge management solution with a minimum number
of external components.
Applications:
•
•
•
•
•
•
•
Lithium-Ion/Lithium-Polymer Battery Chargers
Personal Data Assistants (PDAs)
Cellular Telephones
Hand-Held Instruments
Cradle Chargers
Digital Cameras
MP3 Players
2004-2013 Microchip Technology Inc.
The MCP73861/3 is intended for applications utilizing
single-cell Lithium-Ion or Lithium-Polymer battery
packs, while the MCP73862/4 is intended for dual
series cell Lithium-Ion or Lithium-Polymer battery
packs. The MCP73861/3 has two selectable
voltage-regulation options available (4.1V and 4.2V),
for use with either coke or graphite anodes and operate
with an input voltage range of 4.5V to 12V. The
MCP73862/4 has two selectable voltage-regulation
options available (8.2V and 8.4V), for use with coke or
graphite anodes, and operate with an input voltage
range of 8.7V to 12V.
The MCP73861/2 and MCP73863/4 differ only in the
function of the charge status output (STAT1) when a
charge cycle has been completed. The MCP73861/2
flashes the output, while the MCP73863/4 turns the
output off. Refer to Section 5.2.1 “Charge Status
Outputs (STAT1, STAT2)”.
The MCP7386X family of devices are fully specified
over the ambient temperature range of -40°C to +85°C.
DS21893F-page 1
MCP73861/2/3/4
16-Pin SOIC
VSS2
EN
STAT2
16-Pin QFN
STAT1
Package Types
16 15 14 13
VSET 1
12 VBAT3
VDD2 2
11 VBAT2
EP
17
VDD2 3
10 VBAT1
9 VSS3
DS21893F-page 2
THREF
6
7
THERM
PROG
5
16 EN
STAT1 2
15 VSS2
VSET 3
14 VBAT3
VDD1 4
13 VBAT2
12 VBAT1
VDD2 5
VSS1 6
8
PROG 7
TIMER
VSS1 4
STAT2 1
THREF 8
11 VSS3
10 TIMER
9 THERM
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
Typical Application
1.2A Lithium-Ion Battery Charger
2, 3
5V
4.7µF
1
14
16
15
5
VBAT3 12
10, 11
V
VDD
VSET
4.7 µF
BAT
THREF 6
EN
6.19 kΩ
STAT1 THERM 7
7.32 kΩ
STAT2 TIMER 8
0.1
4, 9, 13
µF
VSS
PROG
+ Single
Lithium-Ion
– Cell
Note: Pin numbers shown are for QFN
package. Please refer to Section 6.0
“Applications” for details.
MCP73861/3
Functional Block Diagram
Direction
Control
VDD1
VBAT1
VDD2
VBAT2
VDD
G = 0.001
4 kΩ
VREF
90
kΩ
1 kΩ
PROG
Charge Current
Control Amplifier
+
+
–
IREG/12
UVLO
COMPARATOR
Precondition
Control
Precondition
Comp.
Constant-Voltage/
Recharge Comp.
VUVLO
–
+
EN
Charge_OK
Precon
VBAT3
Power-On
Delay
600 kΩ
(1.65 MΩ )
–
10 kΩ
VREF
10 kΩ
+
+
–
–
110 k Ω
Charge
Termination
Comparator
+
11 kΩ
VREF
Voltage Control
Amplifier
–
148.42 kΩ Values in ( )
reflect the
MCP73862/4
devices
1.58 kΩ
VREF
300.04 kΩ
Bias and
Reference
Generator
VUVLO
VREF (1.2V)
VSET
10.3 kΩ
(8.58 kΩ)
THREF
100 kΩ
+
–
THERM
Temperature
Comparators
50 kΩ
+
–
50 kΩ
TIMER
2004-2013 Microchip Technology Inc.
VSS1
VSS2
VSS3
STAT1
Drv Stat 1
Control,
IREG/12 Charge
Charge Timers
And Status Logic
Drv Stat 2
Oscillator
STAT2
Charge_OK
DS21893F-page 3
MCP73861/2/3/4
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†
VDDN...............................................................................13.5V
VBATN, VSET, EN, STAT1, STAT2 w.r.t. VSS
.................................................................-0.3 to (VDD + 0.3)V
PROG, THREF, THERM, TIMER w.r.t. VSS ............. -0.3 to 6V
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 (200 pF, No series resistance) ...........300V
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(typ.) + 0.3V] to 12V,
TA = -40°C to +85°C. Typical values are at +25°C, VDD = [VREG (typ.) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
VDD
4.5
—
12
V
8.7
—
12
V
MCP73862/4
ISS
—
0.17
4
µA
Disabled
—
0.53
4
mA
VSTART
4.25
4.5
4.65
V
MCP73861/3
8.45
8.8
9.05
V
MCP73862/4
Supply Input
Supply Voltage
Supply Current
UVLO Start Threshold
MCP73861/3
Operating
VDD Low-to-High
UVLO Stop Threshold
VSTOP
4.20
4.4
4.55
V
MCP73861/3
8.40
8.7
8.95
V
MCP73862/4
VDD High-to-Low
Voltage Regulation (Constant-Voltage Mode)
Regulated Output Voltage
VREG
4.079
4.1
4.121
V
MCP73861/3, VSET = VSS
4.179
4.2
4.221
V
MCP73861/3,VSET = VDD
8.159
8.2
8.241
V
MCP73862/4, VSET = VSS
8.358
8.4
8.442
V
MCP73862/4, VSET = VDD
VDD = [VREG(typ.) + 1V],
IOUT = 10 mA
TA = -5°C to +55°C
Line Regulation
ΔVBAT/
VBAT)| /
ΔVDD
—
0.025
0.25
%/V
Load Regulation
ΔVBAT/
VBAT|
—
0.01
0.25
%
IOUT = 10 mA to 150 mA
VDD = [VREG(typ.)+1V]
Supply Ripple Attenuation
PSRR
—
60
—
dB
IOUT = 10 mA, 10 Hz to 1 kHz
—
42
—
dB
IOUT = 10 mA, 10 Hz to 10 kHz
—
28
—
dB
IOUT = 10 mA, 10 Hz to 1 MHz
VDD = [VREG(typ.)+1V] to 12V
IOUT = 10 mA
Output Reverse Leakage
Current
IDISCHARGE
—
0.23
1
µA
VDD < VBAT = VREG(typ.),
VDD = 1.5 kΩ to Ground
Output Reverse Leakage
Switchover Time
IDISCHARGE
—
0
1000
ms
VDD < VBAT,
VDD VPTH
Current Rise Time Out of
Preconditioning
tRISE
—
—
1
ms
IOUT Rising to 90% of IREG
Fast Charge Safety Timer
Period
tFAST
1.1
1.5
1.9
Hours
CTIMER = 0.1 µF
tPRECON
45
60
75
Minutes
CTIMER = 0.1 µF
tTERM
2.2
3
3.8
Hours
CTIMER = 0.1 µF
Status Output turn-off
tOFF
—
—
200
µs
ISINK = 1 mA to 0 mA
Status Output turn-on
tON
—
—
200
µs
ISINK = 0 mA to 1 mA
UVLO Start Delay
Conditions
Current Regulation
Transition Time Out of
Preconditioning
Preconditioning Current Regulation
Preconditioning Charge Safety
Timer Period
Charge Termination
Elapsed Time Termination
Period
Status Indicators
TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, all limits apply for VDD = [VREG (typ.) + 0.3V] to 12V.
Typical values are at +25°C, VDD = [VREG (typ.) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Specified Temperature Range
TA
-40
Operating Temperature Range
TJ
-40
Storage Temperature Range
TA
Thermal Resistance, 16-lead,
4 mm x 4 mm QFN
Thermal Resistance, 16-lead SOIC
Conditions
—
+85
°C
—
+125
°C
-65
—
+150
°C
JA
—
47
—
°C/W
4-Layer JC51-7 Standard Board,
Natural Convection
JA
—
86.1
—
°C/W
4-Layer JC51-7 Standard Board,
Natural Convection
Temperature Ranges
Thermal Package Resistances
DS21893F-page 6
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
4.207
MCP73861/3
VSET = VDD
VDD = 5.2V
4.205
4.203
4.201
4.199
4.197
4.195
1.00
Supply Current (mA)
Battery Regulation Voltage (V)
NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode.
MCP73861/3
VSET = VDD
VDD = 5.2V
0.90
0.80
0.70
0.60
0.50
0.40
4.193
10
100
10
1000
100
Charge Current (mA)
Charge Current (mA)
MCP73861/3
VSET = VDD
IOUT = 1000 mA
4.30
4.20
4.10
4.00
3.90
FIGURE 2-4:
Supply Current (ISS) vs.
Charge Current (IOUT).
1.60
Supply Current (mA)
Battery Regulation Voltage (V)
FIGURE 2-1:
Battery Regulation Voltage
(VBAT) vs. Charge Current (IOUT).
4.40
MCP73861/3
VSET = VDD
IOUT = 1000 mA
1.40
1.20
1.00
0.80
0.60
0.40
3.80
4.5
6.0
7.5
9.0
10.5
4.5
12.0
6.0
FIGURE 2-2:
Battery Regulation Voltage
(VBAT) vs. Supply Voltage (VDD).
4.205
4.203
9.0
10.5
12.0
FIGURE 2-5:
Supply Current (ISS) vs.
Supply Voltage (VDD).
1.00
MCP73861/3
VSET = VDD
IOUT = 10 mA
Supply Current (mA)
4.207
7.5
Supply Voltage (V)
Supply Voltage (V)
Battery Regulation Voltage (V)
1000
4.201
4.199
4.197
4.195
MCP73861/3
VSET = VDD
IOUT = 10 mA
0.90
0.80
0.70
0.60
0.50
0.40
4.193
4.5
6.0
7.5
9.0
10.5
12.0
Supply Voltage (V)
FIGURE 2-3:
Battery Regulation Voltage
(VBAT) vs. Supply Voltage (VDD).
2004-2013 Microchip Technology Inc.
4.5
6.0
7.5
9.0
10.5
12.0
Supply Voltage (V)
FIGURE 2-6:
Supply Current (ISS) vs.
Supply Voltage (VDD).
DS21893F-page 7
MCP73861/2/3/4
+85°C
0.30
+25°C
0.25
0.20
-40°C
0.15
0.10
0.05
MCP73861/3
VSET = VDD
IOUT = 10 mA
1.40
1.20
1.00
0.80
0.60
100 125 150 175 200
Therm. Bias Current (µA)
FIGURE 2-9:
Thermistor Reference
Voltage (VTHREF) vs. Thermistor Bias Current
(ITHREF).
DS21893F-page 8
80
70
60
50
40
80
70
60
2.500
80
75
70
50
60
25
50
2.500
2.505
40
2.505
2.510
-20
2.510
2.515
MCP73861/3
VSET = VDD
ITHREF = 100 µA
-30
2.515
2.520
-40
MCP73861/3
VSET = VDD
0
FIGURE 2-11:
Battery Regulation Voltage
(VBAT) vs. Ambient Temperature (TA).
Therm. Reference Voltage (V)
Therm. Reference Voltage (V)
2.520
50
Ambient Temperature (°C)
Supply Voltage (V)
FIGURE 2-8:
Thermistor Reference
Voltage (VTHREF) vs. Supply Voltage (VDD).
40
4.193
12.0
30
10.5
20
9.0
4.195
30
7.5
4.197
10
6.0
4.199
20
2.500
4.201
10
2.510
4.203
-20
2.520
MCP73861/3
VSET = VDD
IOUT = 10 mA
4.205
-30
2.530
4.207
-40
MCP73861/3
VSET = VDD
ITHREF = 100 µA
4.5
FIGURE 2-10:
Supply Current (ISS) vs.
Ambient Temperature (TA).
Battery Regulation Voltage (V)
Therm. Reference Voltage (V)
FIGURE 2-7:
Output Leakage Current
(IDISCHARGE) vs. Battery Regulation Voltage
(VBAT).
2.540
30
Ambient Temperature (°C)
Battery Regulation Voltage (V)
2.550
20
4.4
0
4.0
10
3.6
0
3.2
0
2.8
-10
2.4
-40
2.0
-10
0.40
0.00
-10
0.35
1.60
MCP73861/3
VSET = VDD
VDD = VSS
-20
0.40
-30
0.45
Supply Current (mA)
Output Leakage Current (µA)
NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode.
Ambient Temperature (°C)
FIGURE 2-12:
Thermistor Reference
Voltage (VTHREF) vs. Ambient Temperature (TA).
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
8.407
1.00
MCP73862/4
VSET = VDD
VDD = 9.4V
8.405
8.403
Supply Current (mA)
Battery Regulation Voltage (V)
NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode.
8.401
8.399
8.397
8.395
0.90
MCP73862/4
VSET = VDD
VDD = 9.4V
0.80
0.70
0.60
0.50
0.40
8.393
10
100
10
1000
100
Charge Current (mA)
Charge Current (mA)
FIGURE 2-16:
Supply Current (ISS) vs.
Charge Current (IOUT).
8.407
8.403
8.401
1.60
Supply Current (mA)
Battery Regulation Voltage (V)
FIGURE 2-13:
Battery Regulation Voltage
(VBAT) vs. Charge Current (IOUT).
8.405
MCP73862/4
VSET = VDD
IOUT = 1000 mA
8.399
8.397
8.395
8.393
10.0
1.40
MCP73862/4
VSET = VDD
IOUT = 1000 mA
1.20
1.00
0.80
0.60
0.40
10.4
10.8
11.2
11.6
12.0
9.0
9.5
Supply Voltage (V)
10.5
11.0
11.5
12.0
FIGURE 2-17:
Supply Current (ISS) vs.
Supply Voltage (VDD).
1.00
MCP73862/4
VSET = VDD
IOUT = 10 mA
Supply Current (mA)
Battery Regulation Voltage (V)
8.410
10.0
Supply Voltage (V)
FIGURE 2-14:
Battery Regulation Voltage
(VBAT) vs. Supply Voltage (VDD).
8.412
1000
8.408
8.406
8.404
8.402
8.400
0.90
MCP73862/4
VSET = VDD
IOUT = 10 mA
0.80
0.70
0.60
0.50
0.40
8.398
9.0
9.5
10.0
10.5
11.0
11.5
12.0
Supply Voltage (V)
FIGURE 2-15:
Battery Regulation Voltage
(VBAT) vs. Supply Voltage (VDD).
2004-2013 Microchip Technology Inc.
9.0
9.5
10.0
10.5
11.0
11.5
12.0
Supply Voltage (V)
FIGURE 2-18:
Supply Current (ISS) vs.
Supply Voltage (VDD).
DS21893F-page 9
MCP73861/2/3/4
0.45
1.60
MCP73862/4
VSET = VDD
VDD = VSS
0.40
0.35
+85°C
0.30
+25°C
0.25
0.20
-40°C
0.15
0.10
0.05
Supply Current (mA)
MCP73862/4
VSET = VDD
IOUT = 10 mA
1.40
1.20
1.00
0.80
0.60
75
100 125 150 175 200
Thermistor Bias Current (µA)
FIGURE 2-21:
Thermistor Reference
Voltage (VTHREF) vs. Thermistor Bias Current
(ITHREF).
DS21893F-page 10
80
70
60
50
40
80
70
60
50
40
2.530
80
50
70
25
60
0
2.534
50
2.540
2.538
40
2.542
2.542
-20
2.544
MCP73862/4
VSET = VDD
ITHREF = 100 µA
2.546
-30
2.546
2.550
-40
MCP73862/4
VSET = VDD
2.548
FIGURE 2-23:
Battery Regulation Voltage
(VBAT) vs. Ambient Temperature (TA).
Therm. Reference Voltage (V)
Therm. Reference Voltage (V)
2.550
30
Ambient Temperature (°C)
Supply Voltage (V)
FIGURE 2-20:
Thermistor Reference
Voltage (VTHREF) vs. Supply Voltage (VDD).
30
8.386
12.0
30
11.5
20
11.0
8.390
10
10.5
8.394
20
10.0
8.398
10
9.5
8.402
0
2.530
8.406
0
2.540
MCP73862/4
VSET = VDD
IOUT = 10 mA
8.410
-30
2.550
8.414
-40
MCP73862/4
VSET = VDD
ITHREF = 100 µA
9.0
FIGURE 2-22:
Supply Current (ISS) vs.
Ambient Temperature (TA).
Battery Regulation Voltage (V)
Therm. Reference Voltage (V)
FIGURE 2-19:
Output Leakage Current
(IDISCHARGE) vs. Battery Regulation Voltage
(VBAT).
2.560
20
Ambient Temperature (°C)
Battery Regulation Voltage (V)
2.570
0
8.8
10
8.0
-10
7.2
-10
6.4
-10
5.6
-20
4.8
-20
4.0
-30
0.40
0.00
-40
Output Leakage Current (µA)
NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode.
Ambient Temperature (°C)
FIGURE 2-24:
Thermistor Reference
Voltage (VTHREF) vs. Ambient Temperature (TA).
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode.
VDD
VDD
VBAT
VBAT
MCP73861
VDD Stepped from 5.2V to 6.2V
IOUT = 500 mA
COUT = 10 µF, X7R, Ceramic
MCP73861
VDD Stepped from 5.2V to 6.2V
IOUT = 10 mA
COUT = 10 µF, X7R, Ceramic
FIGURE 2-25:
Line Transient Response.
MCP73861
VDD 5.2V
COUT = 10 µF, X7R, Ceramic
FIGURE 2-28:
MCP73861
VDD 5.2V
COUT = 10 µF, X7R, Ceramic
VBAT
100 mA
Line Transient Response.
IOUT
500 mA
10 mA
FIGURE 2-26:
Attenuation (dB)
-10
-20
-30
Load Transient Response.
FIGURE 2-29:
-10
-40
-50
-60
-20
-30
-40
MCP73861
VDD = 5.2V
VAC = 100 mVp-p
IOUT = 100 mA
COUT = 10 μF, X7R, Ceramic
-50
-60
-70
-70
0.1
1
10
100
1000
-80
0.01
Power Supply Ripple
2004-2013 Microchip Technology Inc.
0.1
1
10
100
1000
Frequency (kHz)
Frequency (kHz)
FIGURE 2-27:
Rejection.
Load Transient Response.
0
MCP73861
VDD = 5.2V
VAC = 100 mVp-p
IOUT = 10 mA
COUT = 10 μF, Ceramic
-80
0.01
IOUT
10 mA
Attenuation (dB)
0
VBAT
FIGURE 2-30:
Rejection.
Power Supply Ripple
DS21893F-page 11
MCP73861/2/3/4
NOTE: Unless otherwise indicated, VDD = [VREG(typ.) + 1V], IOUT = 10 mA and TA= +25°C, Constant-voltage mode.
800
600
400
200
501
499
497
495
FIGURE 2-31:
Charge Current (IOUT) vs.
Programming Resistor (RPROG).
80
70
60
50
40
0
30
0
20
536
10
1.6k
-10
4.8k
-20
493
Programming Resistor ()
DS21893F-page 12
MCP73861/2/3/4
VSET = VDD
RPROG = 1.6 kΩ
-30
0
OPEN
503
-40
1000
505
MCP73861/2/3/4
VSET = VDD
Charge Current (mA)
Charge Current (mA)
1200
Ambient Temperature (°C)
FIGURE 2-32:
Charge Current (IOUT) vs.
Ambient Temperature (TA).
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3.1.
TABLE 3-1:
PIN FUNCTION TABLE
MCP73861/2/3/4
QFN
3.1
SOIC
Symbol
Function
1
3
VSET
Voltage Regulation Selection
2
4
VDD1
Battery Management Input Supply
3
5
VDD2
Battery Management Input Supply
4
6
VSS1
Battery Management 0V Reference
5
7
PROG
Current Regulation Set
6
8
THREF
Cell Temperature Sensor Bias
7
9
THERM
Cell Temperature Sensor Input
8
10
TIMER
Timer Set
9
11
VSS3
Battery Management 0V Reference
10
12
VBAT1
Battery Charge Control Output
11
13
VBAT2
Battery Charge Control Output
12
14
VBAT3
Battery Voltage Sense
13
15
VSS2
Battery Management 0V Reference
14
16
EN
15
1
STAT2
Fault Status Output
16
2
STAT1
Charge Status Output
17
–
EP
Logic Enable
Exposed Pad; Battery Management 0V Reference
Voltage Regulation Selection
(VSET)
MCP73861/3: Connect VSET to VSS for 4.1V regulation
voltage, connect to VDD for 4.2V regulation voltage.
MCP73862/4: Connect VSET to VSS for 8.2V regulation
voltage, connect to VDD for 8.4V regulation voltage.
3.2
Battery Management Input Supply
(VDD2, VDD1)
A supply voltage of [VREG (typ.) + 0.3V] to 12V is
recommended. Bypass to VSS with a minimum of
4.7 µF. A 1.5 kΩ resistor should be connected from
VDD to ground when using disconnectable supplies to
force VDD < VBAT when the supply is disconnected and
assure low leakage current.
3.3
Battery Management 0V Reference
(VSS1, VSS2, VSS3)
Connect to negative terminal of battery and input
supply.
3.4
Current Regulation Set (PROG)
Preconditioning, fast and termination currents are
scaled by placing a resistor from PROG to VSS.
2004-2013 Microchip Technology Inc.
3.5
Cell Temperature Sensor Bias
(THREF)
THREF is a voltage reference to bias external thermistor for continuous cell temperature monitoring and
prequalification.
3.6
Cell Temperature Sensor Input
(THERM)
THERM is an input for an external thermistor for continuous cell-temperature monitoring and prequalification.
Connect to THREF/3 to disable temperature sensing.
3.7
Timer Set
All safety timers are scaled by CTIMER/0.1 µF.
3.8
Battery Charge Control Output
(VBAT1, VBAT2)
Connect to positive terminal of battery. Drain terminal
of internal P-channel MOSFET pass transistor. Bypass
to VSS with a minimum of 4.7 µF to ensure loop stability
when the battery is disconnected.
3.9
Battery Voltage Sense (VBAT3)
VBAT3 is a voltage sense input. Connect to positive
terminal of battery. A precision internal resistor divider
regulates the final voltage on this pin to VREG.
DS21893F-page 13
MCP73861/2/3/4
3.10
Logic Enable (EN)
EN is an input to force charge termination, initiate
charge, clear faults or disable automatic recharge.
3.11
Fault Status Output (STAT2)
STAT2 is a current-limited, open-drain drive for direct
connection to a LED for charge status indication. Alternatively, a pull-up resistor can be applied for interfacing
to a host microcontroller.
3.12
Charge Status Output (STAT1)
STAT1 is a current-limited, open-drain drive for direct
connection to a LED for charge status indication. Alternatively, a pull-up resistor can be applied for interfacing
to a host microcontroller.
3.13
Exposed Pad (EP)
There is an internal electrical connection between the
exposed thermal pad and VSS. The EP must be
connected to the same potential as the VSS pin on the
Printed Circuit Board (PCB).
DS21893F-page 14
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
DEVICE OVERVIEW
The MCP7386X family of devices are highly advanced
linear charge management controllers. Refer to the
functional block diagram. Figure 4-2 depicts the operational flow algorithm from charge initiation to
completion and automatic recharge.
4.1
Charge Qualification and
Preconditioning
Upon insertion of a battery, or application of an external
supply, the MCP7386X family of devices automatically
performs a series of safety checks to qualify the
charge. The input source voltage must be above the
Undervoltage Lockout (UVLO) threshold, the enable
pin must be above the logic-high level and the cell
temperature must be within the upper and lower thresholds. The qualification parameters are continuously
monitored. Deviation beyond the limits automatically
suspends or terminates the charge cycle. The input
voltage must deviate below the UVLO stop threshold
for at least one clock period to be considered valid.
Once the qualification parameters have been met, the
MCP7386X initiates a charge cycle. The charge status
output is pulled low throughout the charge cycle (see
Table 5-1 for charge status outputs). If the battery
voltage is below the preconditioning threshold (VPTH),
the MCP7386X preconditions the battery with a
trickle-charge. The preconditioning current is set to
approximately 10% of the fast charge regulation
current. The preconditioning trickle-charge safely
replenishes deeply depleted cells and minimizes heat
dissipation during the initial charge cycle. If the battery
voltage has not exceeded the preconditioning threshold before the preconditioning timer has expired, a fault
is indicated and the charge cycle is terminated.
4.2
Constant Current Regulation –
Fast Charge
Preconditioning ends, and fast charging begins, when
the battery voltage exceeds the preconditioning
threshold. Fast charge regulates to a constant current
(IREG), which is set via an external resistor connected
to the PROG pin. Fast charge continues until the
battery voltage reaches the regulation voltage (VREG),
or the fast charge timer expires; in which case, a fault
is indicated and the charge cycle is terminated.
4.3
Constant Voltage Regulation
When the battery voltage reaches the regulation
voltage (VREG), constant voltage regulation begins.
The MCP7386X monitors the battery voltage at the
VBAT pin. This input is tied directly to the positive
terminal of the battery.
2004-2013 Microchip Technology Inc.
The MCP7386X selects the voltage regulation value
based on the state of VSET. With VSET tied to VSS, the
MCP73861/3 and MCP73862/4 regulate to 4.1V and
8.2V, respectively. With VSET tied to VDD, the
MCP73861/3 and MCP73862/4 regulate to 4.2V and
8.4V, respectively.
4.4
Charge Cycle Completion and
Automatic Re-Charge
The MCP7386X monitors the charging current during
the Constant-voltage regulation mode. The charge
cycle is considered complete when the charge current
has diminished below approximately 8% of the
regulation current (IREG), or the elapsed timer has
expired.
The MCP7386X automatically begins a new charge
cycle when the battery voltage falls below the recharge
threshold (VRTH), assuming all the qualification
parameters are met.
4.5
Thermal Regulation
The MCP7386X family limits the charge current based
on the die temperature. Thermal regulation optimizes
the charge cycle time while maintaining device reliability. If thermal regulation is entered, the timer is automatically slowed down to ensure that a charge cycle will
not terminate prematurely. Figure 4-1 depicts the
thermal regulation profile.
1400
Maximum Charge Current (mA)
4.0
1200
1000
800
Maximum
Minimum
600
400
200
0
0
20
40
60
80
100
120
140
Die Temperature (° C)
FIGURE 4-1:
Typical Maximum Charge
Current vs. Die Temperature.
4.6
Thermal Shutdown
The MCP7386X family suspends charge if the die
temperature exceeds 155°C. Charging will resume
when the die temperature has cooled by approximately
10°C. The thermal shutdown is a secondary safety
feature in the event that there is a failure within the
thermal regulation circuitry.
DS21893F-page 15
FIGURE 4-2:
DS21893F-page 16
Yes
Yes
Yes
VDD < VUVLO
or EN Low
Yes
Yes
Note 2
Note 1
Note 1
No
STAT1 = Off
STAT2 = On
Fault
Charge Current = 0
Reset Safety Timer
No
Yes
STAT1 = Off
STAT2 = Flashing
Safety Timer Suspended
Charge Current = 0
Temperature OK
No
Safety Timer
Expired
No
VBAT > VPTH
No
The charge current will be scaled based on the
die temperature during thermal regulation. Refer
to Section 4.5, “Thermal Regulation”, for
details.
Note 2:
Preconditioning Mode
Charge Current = IPREG
Reset Safety Timer
The qualification parameters are continuously
monitored throughout the charge cycle. Refer to
Section 4.1, “Charge Qualification and
Preconditioning”, for details.
Note 1:
Yes
Yes
STAT1 = On
STAT2 = Off
Yes
Yes
VDD < VUVLO
VBAT < VRTH
or EN Low
No
STAT1 = Flashing
(MCP73861/2)
STAT1 = Off
(MCP73863/4)
STAT2 = Off
(All Devices)
Charge Termination
Charge Current = 0
Reset Safety Timer
No
STAT1 = Flashing
Safety Timer Suspended
Charge Current = 0
Temperature OK
No
IOUT < ITERM
Elapsed Timer
Expired
Constant-Voltage Mode
Output Voltage = VREG
No
STAT1 = Off
STAT2 = Flashing
Charge Current = 0
No
STAT1 = Off
STAT2 = Off
No
STAT1 = Off
STAT2 = Flashing
Safety Timer Suspended
Charge Current = 0
Temperature OK
No
Safety Timer
Expired
No
VBAT = VREG
Constant-Current Mode
Charge Current = IREG
Reset Safety Timer
Yes
VBAT > VPTH
Yes
Temperature OK
Yes
VDD > VUVLO
EN High
Initialize
MCP73861/2/3/4
Operational Flow Algorithm.
2004-2013 Microchip Technology Inc.
MCP73861/2/3/4
5.0
DETAILED DESCRIPTION
5.1
Analog Circuitry
5.1.1
BATTERY MANAGEMENT INPUT
SUPPLY (VDD1, VDD2)
The VDD input is the input supply to the MCP7386X.
The MCP7386X automatically enters a Power-down
mode if the voltage on the VDD input falls below the
UVLO voltage (VSTOP). This feature prevents draining
the battery pack when the VDD supply is not present.
The VDD inputs should be tied to ground with a resistor
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