MCP73213 Microchip Technology, MCP73213 Datasheet - Page 18

• Manufacturer Part Number: MCP73213
• Description: Dual-Cell Li-Ion / Li-Polymer Battery Charge Management
• Manufacturer: Microchip Technology

MCP73213
5.5
During the constant current mode, the programmed
charge current is supplied to the battery or load.
The charge current is established using a single
resistor from PROG to V
the charge current are calculated using the following
equation:
EQUATION 5-1:
EQUATION 5-2:
Table 5-1
(5%) resistors for various charge current to reduce
design time.
TABLE 5-1:
DS22190A-page 18
Current (mA)
Where:
Where:
Charge
R
1000
R
1100
130
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
950
PROG
PROG
I
I
REG
REG
Constant Current MODE - Fast
Charge
provides commonly seen E96 (1%) and E24
R
I
PROG
REG
E96 Resistor (Ω)
=
=
=
=
Recommended
RESISTOR LOOKUP TABLE
=
=
1104 R
8.45k
6.20k
4.99k
4.02k
3.40k
3.00k
2.61k
2.32k
2.10k
1.91k
1.78k
1.62k
1.50k
1.40k
1.33k
1.24k
1.18k
1.10k
1.00k
kilo-ohms (kΩ)
milliampere (mA)
kilo-ohms (kΩ)
milliampere (mA)
10
10k
SS
⎛
⎝
log
. The program resistor and
×
⎛
⎝
----------- -
1104
I
REG
PROG
⎞
⎠
⎞
⎠
⁄
–
– (
E24 Resistor (Ω)
Recommended
0.93
0.93
)
8.20k
6.20k
5.10k
3.90k
3.30k
3.00k
2.70k
2.37k
2.20k
2.00k
1.80k
1.60k
1.50k
1.50k
1.30k
1.20k
1.20k
1.10k
1.00k
10k
Constant current mode is maintained until the voltage
at the V
When constant current mode is invoked, the internal
timer is reset.
5.5.1
If the internal timer expires before the recharge voltage
threshold is reached, a timer fault is indicated and the
charge cycle terminates. The MCP73213 device
remains in this condition until the battery is removed. If
the battery is removed or input power is cycled. The
MCP73213 device enters the Stand-by mode where it
remains until a battery is reinserted.
5.6
When the voltage at the V
regulation voltage, V
begins. The regulation voltage is factory set to 8.2V,
8.4V, 8.7V or 8.8V with a tolerance of ± 0.5%.
5.7
The charge cycle is terminated when, during constant
voltage mode, the average charge current diminishes
below a threshold established with the value of 5%,
7.5%, 10% or 20% of fast charge current or internal
timer has expired. A 1 ms filter time on the termination
comparator ensures that transient load conditions do
not result in premature charge cycle termination. The
timer period is factory set and can be disabled. Refer to
Section 1.0 “Electrical Characteristics” for timer
period options.
5.8
The MCP73213 device continuously monitors the
voltage at the V
the voltage drops below the recharge threshold,
another charge cycle begins and current is once again
supplied to the battery or load. The recharge threshold
is factory set. Refer to Section 1.0 “Electrical
Characteristics” for recharge threshold options.
For the MCP73213 device with no recharge option, the
MCP73213 will go into standby mode when termination
condition is met. The charge will not restart until
following condition has met:
• Battery is removed from system and insert again
• V
• R
Note:
reconnect
DD
PROG
is removed and plug in again
BAT
Constant Voltage Mode
Charge Termination
Automatic Recharge
is disconnected (or high impedance) and
TIMER EXPIRED DURING
CONSTANT CURRENT - FAST
CHARGE MODE
The MCP73213 also offers options with no
automatic recharge.
pin reaches the regulation voltage, V
BAT
pin in the charge complete mode. If
REG
© 2009 Microchip Technology Inc.
, constant voltage regulation
BAT
pin reaches the
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REG
.