SP6680EU/TR 查看數據表（PDF） - Signal Processing Technologies
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SP6680EU/TR Datasheet PDF : 12 Pages
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Input Voltage Ripple with Various Input, Output and Pump Capacitors
Looking at Tables 5, 6 & 7 it can be seen that increasing the value of the input capacitor (Table 5) reduces
the input voltage ripple the most. Note that placement of this input bypass capacitor as close to the
SP6680 input is recommended. Also note that Table 7 shows that increasing the pump capacitor beyond
the values of the other capacitors (2.2uF) actually increases the input ripple voltage and is not
recommended.
Table 5. Input Voltage Ripple vs Input Capacitance
All Ceramic Capacitors ESR < 0.05ohm
Cout, CF1, CF2 = 2.2uF, Iout = 5mA, CLK = 32kHz
Vin = 3.55V (In Regulation)
Cin (uF)
Vin Ripple mV (pp)
0.47
296
1
140
2.2
80
4.7
36
10
24
22
14
Vin = 3.85V (Not in Regulation)
Vin Ripple mV (pp)
30
24
18
12
10
6
Table 6. Input Voltage Ripple vs Output Capacitance
All Ceramic Capacitors ESR < 0.05ohm
Cin, CF1, CF2 = 2.2uF, Iout = 5mA, CLK = 32kHz
Vin = 3.55V (In Regulation)
Vin = 3.85V (Not in Regulation)
Cout (uF)
Vin Ripple mV (pp)
Vin Ripple mV (pp)
0.47
90
30
1
74
24
2.2
80
18
4.7
74
14
10
72
12
22
78
12
Table 7. Input Voltage Ripple vs Pump Capacitance
All Ceramic Capacitors ESR < 0.05ohm
Cin, Cout = 2.2uF, Iout = 5mA, CLK = 32kHz
Vin = 3.55V (In Regulation)
CF1, CF2 (uF)
Vin Ripple mV (pp)
0.47
76
1
76
2.2
80
4.7
154
10
162
22
162
Vin = 3.85V (Not in Regulation)
Vin Ripple mV (pp)
26
20
18
16
16
14
Date: 5/25/04
SP6680 High Efficiency Buck/Boost Charge Pump Regulator
9
© Copyright 2004 Sipex Corporation
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