MCP73831T-4ADI/OT Microchip Technology, MCP73831T-4ADI/OT Datasheet - Page 17
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MCP73831T-4ADI/OT
Manufacturer Part Number
MCP73831T-4ADI/OT
Description
IC,Battery Management,TSOP,5PIN,PLASTIC
Manufacturer
Microchip Technology
Datasheet
1.MCP73831T-2DCIOT.pdf
(28 pages)
Specifications of MCP73831T-4ADI/OT
Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
Voltage - Supply
3.75 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SC-74A, SOT-753
Product
Charge Management
Output Voltage
4.4 V
Operating Supply Voltage
3.75 V to 6 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MCP73831T-4ADI/OT
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
6.0
The MCP73831/2 are designed to operate in conjunc-
tion with a host microcontroller or in a stand-alone
application. The MCP73831/2 provide the preferred
charge algorithm for Lithium-Ion and Lithium-Polymer
FIGURE 6-1:
FIGURE 6-2:
(180 mAh Battery).
6.1
Due to the low efficiency of linear charging, the most
important factors are thermal design and cost, which
are a direct function of the input voltage, output current
and thermal impedance between the battery charger
and the ambient cooling air. The worst-case situation is
when
Preconditioning mode to the Constant-Current mode.
In this situation, the battery charger has to dissipate the
maximum power. A trade-off must be made between
the charge current, cost and thermal requirements of
the charger.
6.1.1
Selection of the external components in
crucial to the integrity and reliability of the charging
system. The following discussion is intended as a guide
for the component selection process.
© 2008 Microchip Technology Inc.
6.0
5.0
4.0
3.0
2.0
1.0
0.0
the
APPLICATIONS
Application Circuit Design
COMPONENT SELECTION
device
MCP73831-2AC/IOT
V
R
DD
PROG
REGULATED
WALL CUBE
= 5.2V
= 10 kΩ
Time (minutes)
Typical Application Circuit.
Typical Charge Profile
has
transitioned
C
IN
Figure 6-1
from
120
100
80
60
40
20
0
R
LED
LED
the
is
Li-Ion Battery Charger
4
1
V
STAT
DD
MCP73831
cells constant current followed by constant voltage.
Figure 6-1
circuit,
accompanying charge profile.
FIGURE 6-3:
Thermal Regulation (1000 mAh Battery).
6.1.1.1
The preferred fast charge current for Lithium-Ion cells
is at the 1C rate, with an absolute maximum current at
the 2C rate. For example, a 500 mAh battery pack has
a preferred fast charge current of 500 mA. Charging at
this rate provides the shortest charge cycle times
without degradation to the battery pack performance or
life.
PROG
6.0
5.0
4.0
3.0
2.0
1.0
0.0
V
V
BAT
SS
while
MCP73831-2AC/IOT
V
R
depicts a typical stand-alone application
DD
PROG
3
5
2
= 5.2V
Current Programming Resistor
(R
= 2 kΩ
PROG
Figures 6-2
R
Time (minutes)
C
MCP73831/2
)
PROG
Typical Charge Profile in
OUT
+
and
-
Single
Li-Ion
Cell
6-3
DS21984E-page 17
depict
600
500
400
300
200
100
0
the