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| 型号： | ADM00313 |
| 厂商： | Microchip Technology |
| 文件页数： | 14/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LI-ION CHRG MCP73830L |
| 设计资源： | MCP73830L Eval Bd Gerber |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP73830L |
| 主要属性： | 1 芯锂离子电池 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 板 |
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MCP73830/L
5.4
Constant Current Mode – Fast
Charge
period is factory set and no timer option is available.
Refer to Section 1.0 “Electrical Characteristics” for
timer period options.
During Constant Current mode, the programmed
charge current is supplied to the battery or load.
5.7
Automatic Recharge
The charge current is established using a single resis-
tor from PROG to V SS . The program resistor and the
charge current are calculated using the following
equation:
MCP73830/L devices with automatic recharge options
continuously monitor the voltage at the V BAT pin during
the Charge Complete mode. If the voltage drops below
the recharge threshold, another charge cycle begins,
RPROG
EQUATION 5-1:
Where:
MCP73830L
200
IREG = --------------------
and current is once again supplied to the battery or
load. The recharge threshold is factory set. Refer to
threshold options.
R PROG
=
kilo-ohms (k ? )
Note:
The MCP73830/L also offer options with
no automatic recharge.
I REG
=
milliampere (mA)
For the MCP73830/L with no recharge option, the
devices will go into Standby mode when a termination
RPROG
EQUATION 5-2:
Where:
R PROG =
MCP73830
1000
IREG = --------------------
kilo-ohms (k ? )
condition is met. The charge will not restart until one of
the following conditions is met:
? Battery is removed from the system and inserted
again.
? V DD is removed and plugged in again
? CE is cycled.
I REG
=
milliampere (mA)
5.8
Thermal Regulation
Constant Current mode is maintained until the voltage
at the V BAT pin reaches the regulation voltage, V REG .
When Constant Current mode is invoked, the internal
timer is reset.
The MCP73830/L should limit the charge currents
based on the die temperature. The thermal regulation
optimizes the charge cycle time while maintaining
device reliability. Figure 5-1 depicts the thermal
5.4.1
TIMER EXPIRED DURING
CONSTANT CURRENT – FAST
CHARGE MODE
regulation for the MCP73830/L devices. Refer to
Considerations” for calculating power dissipation.
If the internal 4-hour timer expires before the recharge
voltage threshold is reached, a timer fault is indicated
and the charge cycle terminates. The MCP73830/L
.
300
devices remain in this condition until the battery is
reinserted, or the input power or CE is cycled.
5.5
Constant Voltage Mode
When voltage at the V BAT pin reaches the regulation
voltage, V REG , the constant voltage regulation begins.
250
200
150
100
50
Mimimum
Maximum
The regulation voltage is factory set to 4.2V, with a
tolerance of ±0.75%.
0
0
30
60
90
120
150
5.6
Charge Termination
Junction Temperature (C)
The charge cycle is terminated when, during Constant
Voltage mode, the average charge current diminishes
below a threshold established with the value of 7.5%,
10% of fast charge current, or the internal timer has
expired. A 1 ms filter time on the termination compara-
tor ensures that transient load conditions do not result
in premature charge cycle termination. The timer
DS25049B-page 14
FIGURE 5-1:
Thermal Regulation.
? 2011 Microchip Technology Inc.
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