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参数资料
| 型号： | KIT34673EPEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 5/13页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MC34673 |
| 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： | MC34673 |
| 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，CD |
Component Selection
5
5.1
Component Selection
Input capacitor C1
The input capacitor is used to minimize the input voltage transient that may cause instability. A
1.0μF or above ceramic capacitor is required for most applications. X5R and X7R dielectrics
have better temperature stability. The evaluation board uses 1.0μF X5R ceramic capacitors.
Considering the maximum input voltage rating of the MC34673 is 28V, the input capacitor must
have 16V DC rated voltage.
5.2
Output capacitors C2, C4, C5 and C6
The output capacitor is used for stable operation. A minimum of a 2.2μF ceramic capacitor is
required. On the evaluation board, a C2 of 2.2μF is necessary. The large capacitors of C4, C5,
and C6 are used to simulate the situation in the cell phone application where big capacitance is
put in parallel with the Li-ion battery. The user may remove C4, C5 and C6 if their system doesn’t
need such large capacitance. C4, C5, and C6 do not affect the performance of the MC34673.
Because the highest output voltage of the MC34673 is 4.2V, a 6.3V DC rated voltage is high
enough for the output capacitors.
5.3
Charge current setting resistors R6, R7 and R8
The resistor between the ISET pin and GND sets the charge current by the following equation:
I CHG = 4000 / (R ISET +96) (A)
where R ISET is in units of ? , I CHG is in units of amps. A metal film with a 1% tolerance resistor
should be used for temperature stability. As a result, the charge current will be accurate over the
whole temperature range.
On the evaluation board, three resistors with two pin header jumpers are used for the user to
conveniently configure different charge current values. Table 2 shows charge current with the
different settings of the pin header JP7 and JP8.
Table 2. The Charge Current Settings
Open
Short
Open
Short
JP7
JP8
Open
Open
Short
Short
Charge Current
300mA
600mA
900mA
1200mA
Using the High Input Voltage Charger for Single Cell Li-Ion Batteries , Rev. 1.0
Freescale Semiconductor
5
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