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| 型号： | MCP73X23EV-LFP |
| 厂商： | Microchip Technology |
| 文件页数： | 22/34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
6.1
Application Circuit Design
Power dissipation with a 5V, ±10% input voltage
Due to the low efficiency of linear charging, the most
important factors are thermal design and cost, which
are a direct function of the input voltage, output current
and thermal impedance between the battery charger
and the ambient cooling air. The worst-case situation is
when the device has transitioned from the
Preconditioning mode to the Constant Current mode. In
this situation, the battery charger has to dissipate the
maximum power. A trade-off must be made between
the charge current, cost, and thermal requirements of
source, 500 mA ±10% and preconditioning threshold
EQUATION 6-2:
PowerDissipation = ? 5.5 V – 2 V ? ? 550 mA = 1.925 W
This power dissipation with the battery charger in the
DFN-10 package will raise the temperature
approximately 83 ? C above room temperature.
the charger.
6.1.1.3
External Capacitors
6.1.1
COMPONENT SELECTION
The MCP73123/223 is stable with or without a battery
Selection of the external components in Figure 6-1 is
crucial to the integrity and reliability of the charging
system. The following discussion is intended as a guide
for the component selection process.
load. In order to maintain good AC stability in the
Constant Voltage mode, a minimum capacitance of
1 μF is recommended to bypass the V BAT pin to V SS .
This capacitance provides compensation when there is
no battery load. In addition, the battery and
6.1.1.1
Charge Current
interconnections appear inductive at high frequencies.
The recommended fast charge current should be
obtained from the battery manufacturer. For exam-
ple, a 1000 mAh battery pack with 2C preferred fast
charge current has a charge current of 1000 mA.
Charging at this rate provides the shortest charge cycle
times without degradation of the battery pack
performance or life.
These elements are in the control feedback loop during
Constant Voltage mode. Therefore, the bypass
capacitance may be necessary to compensate for the
inductive nature of the battery pack.
A minimum of 16V rated 1 μF is recommended for the
output capacitor, and a minimum of 25V rated 1 μF is
recommended for the input capacitor in typical applica-
tions.
Note:
Please consult with your battery supplier
or refer to the battery data sheet for the
TABLE 6-1:
MLCC CAPACITOR EXAMPLE
6.1.1.2
preferred charge rate.
Thermal Considerations
MLCC
Capacitors
Temperature
Range
Tolerance
The worst-case power dissipation in the battery
charger occurs when the input voltage is at the
X7R
X5R
-55 ? C to +125 ? C
-55 ? C to +85 ? C
±15%
±15%
maximum and the device has transitioned from the
Preconditioning mode to the Constant Current mode.
In this case, the power dissipation is calculated using
EQUATION 6-1:
PowerDissipation = ? V DDMAX – V PTHMIN ? ? I REGMAX
Where:
Virtually any good quality output filter capacitor can be
used, independent of the capacitor’s minimum
Effective Series Resistance (ESR) value. The actual
value of the capacitor (and its associated ESR)
depends on the output load current. A 1 μF ceramic,
tantalum, or aluminum electrolytic capacitor at the
output is usually sufficient to ensure stability.
V DDMAX
I REGMAX
V PTHMIN
=
=
=
the maximum input voltage
the maximum fast charge current
the minimum transition threshold
voltage
6.1.1.4 Reverse-Blocking Protection
The MCP73123/223 provides protection from a faulted
or shorted input. Without the protection, a faulted or
shorted input would discharge the battery pack through
the body diode of the internal pass transistor.
DS22191D-page 22
? 2009-2011 Microchip Technology Inc.
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