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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
ceramic capacitor of 1.0 μ F or above is required for most applications. X5R and X7R dielectrics
have better temperature stability. The evaluation board uses 1.0 μ F X5R ceramic capacitors.
Considering the maximum input voltage rating of the MC34675 is 28V, the input capacitor must
have 16V DC rated voltage.
5.2
Output capacitors C2, C4, C5, C6 and C7
The output capacitor is used for stable operation. A ceramic capacitor minimum of a 1.0 μ F is
required. On the evaluation board, a C2 of 1.0 μ F 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 MC34675.
Because the highest output voltage of the MC34675 is 4.2V, a 6.3V DC rated voltage is high
enough for the output capacitors.
The C7 is the output capacitor for the linear regulator. A ceramic capacitor of the value from
0.1 μ F to 1.0 μ F is required for the stable operation of the regulator. The evaluation board uses
0.22 μ F.
5.3
Charge current setting resistors R5, R6, and R7
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 Ω , 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 the charge current with
the different settings of pin headers JP7 and JP8.
Table 2. The Charge Current Settings
Open
Short
Open
Short
JP7
JP8
Open
Open
Short
Short
Charge Current
250mA
500mA
750mA
1000mA
Using the High Input Voltage Charger for Single Cell Li-Ion Batteries , Rev. 1
Freescale Semiconductor
5
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