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| 型号： | MCP73X23EV-LFP |
| 厂商： | Microchip Technology |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL BATT CHARGER MCP73X23 |
| 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： | MCP73123，MCP73223 |
| 主要属性： | 1 芯或 2 芯 LiFePO4（磷酸铁锂），500mA 时为 3.6V 和 7.2V |
| 次要属性： | 安全计时器，热保护，自动终止充电和再充电 |
| 已供物品： | 板 |
| 产品目录页面： | 669 (CN2011-ZH PDF) |
| 相关产品： | MCP73223T-C2SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN MCP73123T-22SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN MCP73223-C2SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN MCP73123-22SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN |
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MCP73123/223
5.9
Thermal Regulation
5.11
Status Indicator
The MCP73123/223 limits the charge current, based
on the die temperature. This thermal regulation
optimizes the charge cycle time while maintaining
device reliability. Figure 5-1 depicts the thermal
regulation for the MCP73123/223 device. Refer to
The charge status outputs are open-drain outputs with
two different states: Low (L) and High Impedance
(Hi-Z). The charge status outputs can be used to
illuminate LEDs. Optionally, the charge status outputs
can be used as an interface to a host microcontroller.
during a charge cycle.
Considerations” for calculating power dissipation.
.
TABLE 5-2:
STATUS OUTPUTS
600
500
400
300
200
CHARGE CYCLE
STATE
Shutdown
Standby
Preconditioning
Constant Current Fast
Charge
STAT
Hi-Z
Hi-Z
L
L
100
V DD = 5.2V
R PROG = 2 k ?
Constant Voltage
L
0
25 35 45 55 65 75 85 95 105 115 125 135 145
Junction Temperature (°C)
Charge Complete - Standby
Temperature Fault
Hi-Z
1.6 second 50% DC
Flashing (Type 2)
FIGURE 5-1:
Thermal Regulation.
Timer Fault
Hi-Z (Type 1)
1.6 second 50% DC
5.10
Thermal Shutdown
Flashing (Type 2)
Hi-Z (Type 1)
The MCP73123/223 suspends charge if the die
temperature exceeds +150°C. Charging will be
resumed when the die temperature has cooled by
Preconditioning Timer Fault
1.6 second 50% DC
Flashing (Type 2)
Hi-Z (Type 1)
approximately 10°C. This thermal shutdown is a
secondary safety feature in the event that there is a
5.12
Battery Short Protection
failure within the thermal regulation circuitry.
? 2009-2011 Microchip Technology Inc.
When a lithium iron phosphate battery is detected, an
internal battery short protection (BSP) circuit starts
monitoring the battery voltage. When V BAT falls below
a typical 1.7V battery short protection threshold voltage
per cell, the charging behavior is postponed.
25 mA (typical) detection current is supplied for
recovering from the battery short condition.
Preconditioning mode resumes when V BAT rises above
battery short protection threshold. The battery voltage
must rise approximately 150 mV above the battery
short protection voltage before the MCP73123/223
device becomes operational.
DS22191D-page 19
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