21984a.book
2005 Microchip Technology Inc.
DS21984A-page 1
MCP73831
Features:
Linear Charge Management Controller:
- Integrated Pass Transistor
- Integrated Current Sense
- Reverse Discharge Protection
High Accuracy Preset Voltage Regulation: + 0.75%
Four Voltage Regulation Options:
- 4.20V, 4.35V, 4.40V, 4.50V
Programmable Charge Current
Selectable Preconditioning
Selectable End-of-Charge Control
Charge Status Output
Automatic Power-Down
Thermal Regulation
Temperature Range: -40C to +85C
Packaging:
- 8-Lead, 2 mm x 3 mm DFN
- 5-Lead, SOT23
Applications:
Lithium-Ion/Lithium-Polymer Battery Chargers
Personal Data Assistants
Cellular Telephones
Digital Cameras
MP3 Players
Bluetooth Headsets
USB Chargers
Typical Application
Description:
The MCP73831 is a highly advanced linear charge
management controller for use in space-limited, cost
sensitive applications. The MCP73831 is available in
an 8-Lead, 2 mm x 3 mm DFN package or a 5-Lead,
SOT23 package. Along with its small physical size, the
low number of external components required makes
the MCP73831 ideally suited for portable applications.
For applications charging from a USB port, the
MCP73831 adheres to all the specifications governing
the USB power bus.
The MCP73831 employs a constant-current/constant-
voltage charge algorithm with selectable precondition-
ing and charge termination. The constant voltage regu-
lation is fixed with four available options: 4.20V, 4.35V,
4.40V, or 4.50V, to accommodate new, emerging bat-
tery charging requirements. The constant current value
is set with one external resistor. The MCP73831 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.
Several options are available for the preconditioning
threshold, preconditioning current value, charge termi-
nation value, and automatic recharge threshold. The
preconditioning value and charge termination value are
set as a ratio, or percentage, of the programmed con-
stant current value. Preconditioning can be disabled.
Refer to Section 1.0 "Electrical Characteristics" for
available options and the Product Identification System
for standard options.
The MCP73831 is fully specified over the ambient
temperature range of -40C to +85C.
Package Types
STAT
V
DD
V
SS
PROG
V
BAT
+
-
Single
Li-Ion
Cell
4
MCP73831
5
3
1
500 mA Li-Ion Battery Charger
2
V
IN
4.7
F
470
2 k
4.7
F
SOT23-5
V
BAT
V
SS
V
DD
1
2
3
5
4
PROG
STAT
8-Lead DFN
1
2
3
4
8
7
6
5
V
DD
V
BAT
V
BAT
V
DD
NC
PROG
V
SS
STAT
(2 mm x 3 mm)
Miniature Single Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controller
MCP73831
DS21984A-page 2
2005 Microchip Technology Inc.
Functional Block Diagram
+
-
REFERENCE
GENERATOR
V
REF
(1.22V)
V
BAT
V
DD
STAT
PROG
V
BAT
G=0.001
V
SS
DIRECTION
CONTROL
477 k
255 k
UVLO
+
-
+
-
SHDN
DIRECTION
CONTROL
0.5
A
PRECONDITION
6
A
6
A
+
-
TERMINATION
+
-
43.6 k
+
-
CA
3.9 k
111 k
190 k
7 k
15 k
182.3 k
111 k
CHARGE
+
-
+
-
VA
89 k
361 k
100 k
0.5
A
2005 Microchip Technology Inc.
DS21984A-page 3
MCP73831
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings
V
DD
N
.................................................................................7.0V
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 .....................................-65C to +150C
ESD protection on all pins:
Human Body Model (1.5 k
in Series with 100 pF)
.......
4 kV
Machine Model (200 pF, No Series Resistance) .............400V
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 V
DD
= [V
REG
(typ.) + 0.3V] to 6V, T
A
= -40C to +85C.
Typical values are at +25C, V
DD
= [V
REG
(typ.) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Supply Input
Supply Voltage
V
DD
3.75
--
6
V
Supply Current
I
SS
--
510
1500
A
Charging
--
53
200
A
Charge Complete,
No Battery
--
25
50
A
PROG Floating
--
1
5
A
V
DD
< (V
BAT
- 50 mV)
--
0.1
2
A
V
DD
< V
STOP
UVLO Start Threshold
V
START
3.3
3.45
3.6
V
V
DD
Low-to-High
UVLO Stop Threshold
V
STOP
3.2
3.38
3.5
V
V
DD
High-to-Low
UVLO Hysteresis
V
HYS
--
70
--
mV
Voltage Regulation (Constant-Voltage Mode)
Regulated Output Voltage
V
REG
4.168
4.20
4.232
V
MCP73831-2
4.317
4.35
4.383
V
MCP73831-3
4.367
4.40
4.433
V
MCP73831-4
4.466
4.50
4.534
V
MCP73831-5
V
DD
= [V
REG
(Typ)+1V]
I
OUT
= 10 mA
T
A
= -5C to +55C
Line Regulation
|(
V
BAT
/V
BAT
)/
V
DD
|
--
0.09
0.30
%/V
V
DD
= [V
REG
(Typ)+1V] to 6V
I
OUT
= 10 mA
Load Regulation
|
V
BAT
/V
BAT
|
--
0.05
0.30
%
I
OUT
= 10 mA to 50 mA
V
DD
= [V
REG
(Typ)+1V]
Supply Ripple Attenuation
PSRR
--
52
---
dB
I
OUT
=10 mA, 10Hz to 1 kHz
--
47
--
dB
I
OUT
=10 mA, 10Hz to 10 kHz
--
22
--
dB
I
OUT
=10 mA, 10Hz to 1 MHz
Current Regulation (Fast Charge Constant-Current Mode)
Fast Charge Current
Regulation
I
REG
90
100
110
mA
PROG = 10 k
450
505
550
mA
PROG = 2.0 k
,
Note 1
T
A
= -5C to +55C
Note
1:
Not production tested. Ensured by design.
MCP73831
DS21984A-page 4
2005 Microchip Technology Inc.
Preconditioning Current Regulation (Trickle Charge Constant-Current Mode)
Precondition Current
Ratio
I
PREG
/ I
REG
7.5
10
12.5
%
PROG = 2.0 k
to 10 k
15
20
25
%
PROG = 2.0 k
to 10 k
30
40
50
%
PROG = 2.0 k
to 10 k
--
100
--
%
No Preconditioning
T
A
= -5C to +55C
Precondition Voltage
Threshold Ratio
V
PTH
/ V
REG
64
66.5
69
%
V
BAT
Low-to-High
69
71.5
74
%
V
BAT
Low-to-High
Precondition Hysteresis
V
PHYS
--
110
--
mV
V
BAT
High-to-Low
Charge Termination
Charge Termination
Current Ratio
I
TERM
/ I
REG
3.75
5
6.25
%
PROG = 2.0 k
to 10 k
5.6
7.5
9.4
%
PROG = 2.0 k
to 10 k
7.5
10
12.5
%
PROG = 2.0 k
to 10 k
15
20
25
%
PROG = 2.0 k
to 10 k
T
A
= -5C to +55C
Automatic Recharge
Recharge Voltage Thresh-
old Ratio
V
RTH
/ V
REG
91.5
94.0
96.5
%
V
BAT
High-to-Low
94
96.5
99
%
V
BAT
High-to-Low
Pass Transistor ON-Resistance
ON-Resistance
R
DSON
--
350
--
m
V
DD
= 3.75V, T
J
= 105C
Battery Discharge Current
Output Reverse Leakage
Current
I
DISCHARGE
--
0.15
2
A
PROG Floating
--
0.25
2
A
V
DD
< (V
BAT
- 50 mV)
--
0.15
2
A
V
DD
< V
STOP
--
-5.5
-15
A
Charge Complete
Status Indicator STAT
Sink Current
I
SINK
--
--
25
mA
Low Output Voltage
V
OL
--
0.4
1
V
I
SINK
= 4 mA
Source Current
I
SOURCE
--
--
35
mA
High Output Voltage
V
OH
--
V
DD
-0.4
V
DD
- 1
V
I
SOURCE
= 4 mA
Input Leakage Current
I
LK
--
0.03
1
A
High-Impedance
PROG Input
Charge Impedance
Range
R
PROG
2
--
20
k
Minimum Shutdown
Impedance
R
PROG
70
--
200
k
Thermal Shutdown
Die Temperature
T
SD
--
150
--
C
Die Temperature
Hysteresis
T
SDHYS
--
10
--
C
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typ.) + 0.3V] to 6V, T
A
= -40C to +85C.
Typical values are at +25C, V
DD
= [V
REG
(typ.) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Note
1:
Not production tested. Ensured by design.
2005 Microchip Technology Inc.
DS21984A-page 5
MCP73831
TEMPERATURE SPECIFICATIONS
AC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typ.) + 0.3V] to 12V,
T
A
= -40C to +85C. Typical values are at +25C, V
DD
= [V
REG
(typ.) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
UVLO Start Delay
t
START
--
--
5
ms
V
DD
Low-to-High
Constant-Current Regulation
Transition Time Out of
Preconditioning
t
DELAY
--
--
1
ms
V
BAT
< V
PTH
to V
BAT
> V
PTH
Current Rise Time Out of
Preconditioning
t
RISE
--
--
1
ms
I
OUT
Rising to 90% of I
REG
Termination Comparator
Filter
t
TERM
0.4
1.3
3.2
ms
Average I
OUT
Falling
Charge Comparator Filter
t
CHARGE
0.4
1.3
3.2
ms
Average V
BAT
Status Indicator
Status Output turn-off
t
OFF
--
--
200
s
I
SINK
= 1 mA to 0 mA
Status Output turn-on
t
ON
--
--
200
s
I
SINK
= 0 mA to 1 mA
Electrical Specifications: Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typ.) + 0.3V] to 12V.
Typical values are at +25C, V
DD
= [V
REG
(typ.) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Temperature Ranges
Specified Temperature Range
T
A
-40
--
+85
C
Operating Temperature Range
T
J
-40
--
+125
C
Storage Temperature Range
T
A
-65
--
+150
C
Thermal Package Resistances
5-Lead, SOT23
JA
--
230
--
C/W
4-Layer JC51-7 Standard
Board, Natural Convection
8-Lead, 2 mm x 3 mm, DFN
JA
--
76
--
C/W
4-Layer JC51-7 Standard
Board, Natural Convection
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