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參數(shù)資料
| 型號： | MCP73862 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Advanced Dual Cell, Fully Integrated Li-Ion /Li-Polymer Charge Management Controllers(增強型兩節(jié)高度集成的鋰離子/鋰聚合物充電管理控制器) |
| 中文描述： | 先進的雙電池，完全集成的鋰離子/鋰聚合物充電管理控制器（增強型兩節(jié)高度集成的鋰離子/鋰聚合物充電管理控制器） |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 402K |
| 代理商： | MCP73862 |
2004 Microchip Technology Inc.
DS21893A-page 13
MCP73861/2
4.0
DEVICE OVERVIEW
The MCP7386X family of devices are highly advanced
linear charge management controllers. Refer to the
functional block diagram. Figure 4-2 depicts the opera-
tional flow algorithm from charge initiation to
completion and automatic recharge.
4.1
Charge Qualification and
Preconditioning
Upon insertion of a battery or application of an external
supply, the MCP7386X family of devices automatically
performs a series of safety checks to qualify the
charge. The input source voltage must be above the
undervoltage lockout threshold, the enable pin must be
above the logic-high level and the cell temperature
must be within the upper and lower thresholds. The
qualification parameters are continuously monitored.
Deviation beyond the limits automatically suspends or
terminates the charge cycle. The input voltage must
deviate below the undervoltage lockout stop threshold
for at least one clock period to be considered valid.
After the qualification parameters have been met, the
MCP7386X initiates a charge cycle. The charge status
output is pulled low throughout the charge cycle (see
Table 5-1 for charge status outputs). If the battery volt-
age is below the preconditioning threshold (V
PTH
) the
MCP7386X preconditions the battery with a trickle-
charge. The preconditioning current is set to approxi-
mately 10% of the fast charge regulation current. The
preconditioning trickle-charge safely replenishes
deeply depleted cells and minimizes heat dissipation
during the initial charge cycle. If the battery voltage has
not exceeded the preconditioning threshold before the
preconditioning timer has expired, a fault is indicated
and the charge cycle is terminated.
4.2
Constant Current Regulation -
Fast Charge
Preconditioning ends, and fast charging begins, when
the battery voltage exceeds the preconditioning thresh-
old. Fast charge regulates to a constant current (I
REG
),
which is set via an external resistor connected to the
PROG pin. Fast charge continues until the battery volt-
age reaches the regulation voltage (V
REG
), or the fast
charge timer expires; in which case, a fault is indicated
and the charge cycle is terminated.
4.3
Constant Voltage Regulation
When the battery voltage reaches the regulation volt-
age (V
REG
) constant voltage regulation begins. The
MCP7386X monitors the battery voltage at the V
BAT
pin. This input is tied directly to the positive terminal of
the battery. The MCP7386X selects the voltage regula-
tion value based on the state of the V
SET
. With V
SET
tied to V
SS
, the MCP73861 and MCP73862 regulate to
4.1V and 8.2V, respectively. With V
SET
tied to V
DD
, the
MCP73861 and MCP73862 regulate to 4.2V and 8.4V,
respectively.
4.4
Charge Cycle Completion and
Automatic Re-Charge
The MCP7386X monitors the charging current during
the constant voltage regulation phase. The charge cycle
is considered complete when the charge current has
diminished below approximately 8% of the regulation
current (I
REG
) or the elapsed timer has expired.
The MCP7386X automatically begins a new charge
cycle when the battery voltage falls below the recharge
threshold (V
RTH
) assuming all the qualification
parameters are met.
4.5
Thermal Regulation
The MCP7386X family limits the charge current based
on the die temperature. Thermal regulation optimizes
the charge cycle time while maintaining device reliabil-
ity. If thermal regulation is entered, the timer is automat-
ically slowed down to ensure that a charge cycle will
not terminate prematurely. Figure 4-1 depicts the
thermal regulation profile.
FIGURE 4-1:
Current vs. Die Temperature.
Typical Maximum Charge
4.6
Thermal Shutdown
The MCP7386X family suspends charge if the die tem-
perature exceeds 155°C. Charging will resume when
the die temperature has cooled by approximately 10°C.
The thermal shutdown is a secondary safety feature in
the event that there is a failure within the thermal
regulation circuitry.
0
200
400
600
800
1000
1200
1400
0
20
40
60
80
100
120
140
Die Temperature (° C)
M
Minimum
Maximum
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參數(shù)描述 |
|---|---|
| MCP73862-I/ML | 功能描述:電池管理 Daul High Integrated RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73862-I/MLG | 功能描述:電池管理 Daul High Integrated Lead Free Package RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73862-I/SL | 功能描述:電池管理 Charge mgmt contr RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73862T | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Advanced Single or Dual Cell, Fully Integrated Li-Ion/Li-Polymer Charge Management |
| MCP73862T-I/ML | 功能描述:電池管理 Daul High Integrated RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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