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MCP73864-I/ML Datasheet

  • MCP73864-I/ML

  • Battery Management - Advanced Lithium-Ion/-Polymer Charge mg...

  • 443.80KB

  • 28页

  • Microchip   Microchip

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MCP73861/2/3/4
Preconditioning
Mode
Regulation
Voltage
(V
REG
)
Regulation
Current
(I
REG
)
Constant-Current
Mode
Constant-Voltage
Mode
Charge
Voltage
Transition
Threshold
(V
PTH
)
Precondition
Current
(I
PREG
)
Termination
Current
(I
TERM
)
Precondition
Safety Timer
Fast Charge
Safety Timer
Elapsed Time
Termination Timer
Charge
Current
FIGURE 6-3:
Typical Charge Profile in Thermal Regulation.
1200 mA is the maximum charge current obtainable
from the MCP7386X. For this situation, the PROG input
should be connected directly to V
SS
.
6.1
Application Circuit Design
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 the device has transitioned from the
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.
6.1.1.2
Thermal Considerations
The worst-case power dissipation in the battery
charger occurs when the input voltage is at the
maximum and the device has transitioned from the
Preconditioning mode to the Constant-current mode. In
this case, the power dissipation is:
PowerDissipation
=
(
V DDMAX
鈥?/div>
V PTHMIN
) 脳
I REGMAX
6.1.1
COMPONENT SELECTION
Where:
V
DDMAX
I
REGMAX
V
PTHMIN
=
=
=
the maximum input voltage
the maximum fast charge current
the minimum transition threshold
voltage
Selection of the external components in Figure 6-1 is
crucial to the integrity and reliability of the charging
system. The following discussion is intended as a guide
for the component selection process.
6.1.1.1
Current Programming Resistor
(R
PROG
)
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 with-
out degradation to the battery pack performance or life.
DS21893C-page 18
漏
2005 Microchip Technology Inc.

MCP73864-I/ML 产品属性

  • Microchip

  • 电池管理

  • Li-Ion, Li-Poly

  • 8.2 V, 8.4 V

  • 1200 mA

  • + 85 C

  • - 40 C

  • QFN

  • Tube

  • SMD/SMT

  • 91

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