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參數(shù)資料
| 型號(hào)： | MCP73832-5DCI/MC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 2 X 3 MM, 0.90 MM HEIGHT, PLASTIC, MO-229VCED-2, DFN-8 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 786K |
| 代理商： | MCP73832-5DCI/MC |
2007 Microchip Technology Inc.
DS21984C-page 11
MCP73831/2
4.5
Constant-Voltage Mode
When the voltage at the VBAT pin reaches the regula-
tion voltage, VREG, constant voltage regulation begins.
The regulation voltage is factory set to 4.2V, 4.35V,
4.40V, or 4.50V with a tolerance of ±0.75%.
4.6
Charge Termination
The charge cycle is terminated when, during Constant-
Voltage mode, the average charge current diminishes
below a percentage of the programmed charge current
(established with the value of the resistor connected to
the PROG pin). A 1 ms filter time on the termination
comparator ensures that transient load conditions do
not result in premature charge cycle termination. The
percentage or ratio of the current is factory set. Refer to
Section 1.0 “Electrical Characteristics” for charge
termination current options and the ”Product
Identification System” for standard options.
The charge current is latched off and the MCP73831/2
enter a Charge Complete mode.
4.7
Automatic Recharge
The MCP73831/2 continuously monitor the voltage at
the VBAT pin in the Charge Complete mode. If 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 and the ”Product
Identification System” for standard options.
4.8
Thermal Regulation
The MCP73831/2 limit the charge current based on the
die temperature. The thermal regulation optimizes the
charge cycle time while maintaining device reliability.
Figure 4-2 depicts the thermal regulation for the
MCP73831/2.
FIGURE 4-2:
Thermal Regulation.
4.9
Thermal Shutdown
The MCP73831/2 suspend charge if the die tempera-
ture exceeds 150°C. Charging will resume when the
die temperature has cooled by approximately 10°C.
0
75
150
225
300
375
450
525
25
35
45
55
65
75
85
95
105
115
125
135
145
155
Junction Temperature (°C)
Charge
Current
(mA)
RPROG = 2 kΩ
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