MCP73831/2
Miniature Single-Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controllers
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: 15 mA to 500 mA
• Selectable Preconditioning:
- 10%, 20%, 40%, or Disable
• Selectable End-of-Charge Control:
- 5%, 7.5%, 10%, or 20%
• Charge Status Output
- Tri-State Output - MCP73831
- Open-Drain Output - MCP73832
• Automatic Power-Down
• Thermal Regulation
• Temperature Range: -40°C to +85°C
• Packaging:
- 8-Lead, 2 mm x 3 mm DFN
- 5-Lead, SOT-23
Description:
The MCP73831/2 devices are highly advanced linear
charge management controllers for use in space-lim-
ited, cost-sensitive applications. The MCP73831/2 are
available in an 8-Lead, 2 mm x 3 mm DFN package or
a 5-Lead, SOT-23 package. Along with their small
physical size, the low number of external components
required make the MCP73831/2 ideally suited for
portable applications. For applications charging from a
USB port, the MCP73831/2 adhere to all the
specifications governing the USB power bus.
The MCP73831/2 employ a constant-current/constant-
voltage charge algorithm with selectable precondition-
ing and charge termination. The constant voltage
regulation is fixed with four available options: 4.20V,
4.35V, 4.40V or 4.50V, to accommodate new, emerging
battery charging requirements. The constant current
value is set with one external resistor. The MCP73831/
2 devices limit the charge current based on die temper-
ature 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
termination value and automatic recharge threshold.
The preconditioning value and charge termination
value are set as a ratio, or percentage, of the
programmed constant current value. Preconditioning
can be disabled. Refer to
Section 1.0 “Electrical
Characteristics”
for available options and the
“Prod-
uct Identification System”
for standard options.
The MCP73831/2 devices are fully specified over the
ambient temperature range of -40°C to +85°C.
Applications
•
•
•
•
•
•
•
Lithium-Ion/Lithium-Polymer Battery Chargers
Personal Data Assistants
Cellular Telephones
Digital Cameras
MP3 Players
Bluetooth Headsets
USB Chargers
Package Types
MCP73831/2
2×3 DFN*
V
DD
1
8 PROG
EP
9
7 NC
6 V
SS
5 STAT
Typical Application
500 mA Li-Ion Battery Charger
V
IN
4.7
μF
4 V
DD
V
BAT
3
4.7
μF
PROG
470Ω
1
STAT
V
SS
2
5
2 kΩ
+ Single
Li-Ion
- Cell
MCP73831/2
SOT-23-5
STAT 1
V
SS
2
V
BAT
3
5 PROG
4 V
DD
V
DD
2
V
BAT
3
V
BAT
4
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
MCP73831
©
2008 Microchip Technology Inc.
DS21984E-page 1
MCP73831/2
Functional Block Diagram
V
DD
6 mA
DIRECTION
CONTROL
V
BAT
6 mA
G=0.001
PROG
0.5 mA
+
-
43.6 kΩ
361 kΩ
89 kΩ
111 kΩ
+
-
TERMINATION
+
-
CHARGE
15 kΩ
STAT
+
-
3.9 kΩ
VDD
CA
MCP73831
ONLY
REFERENCE
GENERATOR
V
REF
(1.22V)
PRECONDITION
182.3 kΩ
7 kΩ
+
-
190 kΩ
VA
111 kΩ
+
-
+
-
+
-
SHDN
DIRECTION
CONTROL
UVLO
0.5 mA
V
BAT
477 kΩ
255 kΩ
100 kΩ
V
SS
DS21984E-page 2
©
2008 Microchip Technology Inc.
MCP73831/2
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
...................................................................................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 .....................................-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) .............400V
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typical) + 0.3V] to 6V, T
A
= -40°C to +85°C.
Typical values are at +25°C, V
DD
= [V
REG
(typical) + 1.0V]
Parameters
Supply Input
Supply Voltage
Supply Current
V
DD
I
SS
3.75
—
—
—
—
—
UVLO Start Threshold
UVLO Stop Threshold
UVLO Hysteresis
Regulated Output Voltage
V
START
V
STOP
V
HYS
V
REG
3.3
3.2
—
4.168
4.317
4.367
4.466
—
510
53
25
1
0.1
3.45
3.38
70
4.20
4.35
4.40
4.50
6
1500
200
50
5
2
3.6
3.5
—
4.232
4.383
4.433
4.534
V
µA
µA
µA
µA
µA
V
V
mV
V
V
V
V
MCP7383X-2
MCP7383X-3
MCP7383X-4
MCP7383X-5
V
DD
= [V
REG
(typical)+1V]
I
OUT
= 10 mA
T
A
= -5°C to +55°C
Line Regulation
Load Regulation
Supply Ripple Attenuation
|(ΔV
BAT
/
V
BAT
)/ΔV
DD
|
|ΔV
BAT
/V
BAT
|
PSRR
—
—
—
—
—
Current Regulation (Fast Charge Constant-Current Mode)
Fast Charge Current
Regulation
I
REG
90
450
12.5
Note 1:
Not production tested. Ensured by design.
100
505
14.5
110
550
16.5
mA
mA
mA
PROG = 10 kΩ
PROG = 2.0 kΩ,
Note 1
PROG = 67 kΩ
T
A
= -5°C to +55°C
0.09
0.05
52
47
22
0.30
0.30
—-
—
—
%/V
%
dB
dB
dB
V
DD
= [V
REG
(typical)+1V] to
6V, I
OUT
= 10 mA
I
OUT
= 10 mA to 50 mA
V
DD
= [V
REG
(typical)+1V]
I
OUT
=10 mA, 10Hz to 1 kHz
I
OUT
=10 mA, 10Hz to 10 kHz
I
OUT
=10 mA, 10Hz to 1 MHz
Charging
Charge Complete,
No Battery
PROG Floating
V
DD
< (V
BAT
- 50 mV)
V
DD
< V
STOP
V
DD
Low-to-High
V
DD
High-to-Low
Sym.
Min.
Typ.
Max.
Units
Conditions
Voltage Regulation (Constant-Voltage Mode)
©
2008 Microchip Technology Inc.
DS21984E-page 3
MCP73831/2
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typical) + 0.3V] to 6V, T
A
= -40°C to +85°C.
Typical values are at +25°C, V
DD
= [V
REG
(typical) + 1.0V]
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Preconditioning Current Regulation (Trickle Charge Constant-Current Mode)
Precondition Current
Ratio
I
PREG
/ I
REG
7.5
15
30
—
Precondition Voltage
Threshold Ratio
Precondition Hysteresis
Charge Termination
Charge Termination
Current Ratio
I
TERM
/ I
REG
3.75
5.6
8.5
15
Automatic Recharge
Recharge Voltage
Threshold Ratio
V
RTH
/ V
REG
91.5
94
R
DSON
I
DISCHARGE
—
—
—
—
—
Status Indicator – STAT
Sink Current
Low Output Voltage
Source Current
High Output Voltage
Input Leakage Current
PROG Input
Charge Impedance
Range
Minimum Shutdown
Impedance
Automatic Power Down
Automatic Power Down
Entry Threshold
Automatic Power Down
Exit Threshold
Thermal Shutdown
Die Temperature
Die Temperature
Hysteresis
Note 1:
T
SD
T
SDHYS
—
—
150
10
—
—
°C
°C
V
PDENTER
V
PDEXIT
V
DD
<(V
BAT
+20 mV)
—
V
DD
<(V
BAT
+50 mV)
V
DD
<(V
BAT
+150 mV)
—
V
DD
<(V
BAT
+200 mV)
3.5V
≤
V
BAT
≤
V
REG
V
DD
Falling
3.5V
≤
V
BAT
≤
V
REG
V
DD
Rising
R
PROG
R
PROG
2
70
—
—
67
200
kΩ
kΩ
I
SINK
V
OL
I
SOURCE
V
OH
I
LK
—
—
—
—
—
—
0.4
—
V
DD
-0.4
0.03
25
1
35
V
DD
- 1
1
mA
V
mA
V
µA
I
SOURCE
= 4 mA (MCP73831)
High-Impedance
I
SINK
= 4 mA
94.0
96.5
350
0.15
0.25
0.15
-5.5
96.5
99
—
2
2
2
-15
%
%
mΩ
µA
µA
µA
µA
V
BAT
High-to-Low
V
BAT
High-to-Low
V
DD
= 3.75V, T
J
= 105°C
PROG Floating
V
DD
Floating
V
DD
< V
STOP
Charge Complete
5
7.5
10
20
6.25
9.4
11.5
25
%
%
%
%
PROG = 2.0 kΩ to 10 kΩ
PROG = 2.0 kΩ to 10 kΩ
PROG = 2.0 kΩ to 10 kΩ
PROG = 2.0 kΩ to 10 kΩ
T
A
= -5°C to +55°C
V
PTH
/ V
REG
V
PHYS
64
69
—
10
20
40
100
66.5
71.5
110
12.5
25
50
—
69
74
—
%
%
%
%
%
%
mV
PROG = 2.0 kΩ to 10 kΩ
PROG = 2.0 kΩ to 10 kΩ
PROG = 2.0 kΩ to 10 kΩ
No Preconditioning
T
A
= -5°C to +55°C
V
BAT
Low-to-High
V
BAT
Low-to-High
V
BAT
High-to-Low
Pass Transistor ON-Resistance
ON-Resistance
Battery Discharge Current
Output Reverse Leakage
Current
Not production tested. Ensured by design.
DS21984E-page 4
©
2008 Microchip Technology Inc.
MCP73831/2
AC 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
UVLO Start Delay
Constant-Current Regulation
Transition Time Out of
Preconditioning
Current Rise Time Out of
Preconditioning
Termination Comparator
Filter
Charge Comparator Filter
Status Indicator
Status Output turn-off
Status Output turn-on
t
OFF
t
ON
—
—
—
—
200
200
µ
s
µ
s
Sym.
t
START
t
DELAY
t
RISE
t
TERM
t
CHARGE
Min.
—
—
—
0.4
0.4
Typ.
—
—
—
1.3
1.3
Max.
5
1
1
3.2
3.2
Units
ms
ms
ms
ms
ms
Conditions
V
DD
Low-to-High
V
BAT
< V
PTH
to V
BAT
> V
PTH
I
OUT
Rising to 90% of I
REG
Average I
OUT
Falling
Average V
BAT
I
SINK
= 1 mA to 0 mA
I
SINK
= 0 mA to 1 mA
TEMPERATURE SPECIFICATIONS
Electrical Specifications:
Unless otherwise indicated, all limits apply for V
DD
= [V
REG
(typical) + 0.3V] to 12V.
Typical values are at +25°C, V
DD
= [V
REG
(typical) + 1.0V]
Parameters
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
5-Lead, SOT-23
θ
JA
—
230
—
°C/W
4-Layer JC51-7 Standard
Board, Natural Convection
(Note 2)
4-Layer JC51-7 Standard
Board, Natural Convection
(Note 1)
T
A
T
J
T
A
-40
-40
-65
—
—
—
+85
+125
+150
°C
°C
°C
Sym.
Min.
Typ.
Max.
Units
Conditions
8-Lead, 2 mm x 3 mm, DFN
θ
JA
—
76
—
°C/W
Note 1:
2:
This represents the minimum copper condition on the PCB (Printed Circuit Board).
With large copper area on the PCB, the SOT-23-5 thermal resistance (
θ
JA
) can reach a typical value of
130°C/W or better.
©
2008 Microchip Technology Inc.
DS21984E-page 5
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