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MCP73861 Datasheet

  • MCP73861

  • Advanced Single or Dual Cell, Fully Integrated Li-Ion /Li-Po...

  • 773.90KB

  • 34页

  • Microchip   Microchip

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MCP73861/2
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 precondi-
tioning phase to the constant current phase. 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 phase to the constant current phase. 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
is the maximum input voltage
I
REGMAX
is the maximum fast charge current
V
PTHMIN
is 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.
DS21893A-page 18
铮?/div>
2004 Microchip Technology Inc.

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