SP6644 Datasheet, PDF (6/15 Pages) Sipex Corporation – Single/Dual Alkaline Cell, High Efficiency Step-Up DC-DC Converter

Refer to the circuit in Figure 28, T_AMB = +25^oC unless otherwise noted.
100
90
80
Vb=1.0V
Vb=1.3V
70
Vb=2.0V
60
Vb=2.6V
Vb=3.2V
50
40
30
0.1
1.0
10.0
100.0
Iload (mA)
1000.0
Figure 17. SP6644/6201 DC/DC LDO Combination
Efficiency vs. Output Current (Vout=3.3V), Rlim=2.5k,
Li=22µH Sumida CD-43, Refer to Figure 30
240
220
200
180
160
140
120
100
80
60
40
20
0
0.0
1.0
2.0
3.0
4.0
Vbatt (V)
Figure 19. SP6644/6201 DC/DC LDO Maximum Load
Current vs. Vbatt (Vout=3.3V), Rlim=2.5k, Li=22µH
Sumida CD-43, Refer to Figure 30
PERFORMANCE CHARACTERISTICS
3.037
3.036
3.035
3.034
Vb=1.3V
Vb=2.6V
3.033
3.032
0
20 40 60 80 100 120 140 160 180 200
Iload (mA)
Figure 18. SP6644/6201 LDO Line/Load Rejection vs.
Output Current (Vout=3.3V), Rlim=2.5k, Li=22µH
Sumida CD-43, Refer to Figure 30
10000
1000
100
10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Vbatt (V)
Figure 20. SP6644/6201 DC/DC LDO No-Load Ibatt vs.
Vbatt (Vout=3.3V), Rlim=2.5k, Li=22µH Sumida CD-
43, Refer to Figure 30
SP6201 Out
10mV/div
SP6644 Out
20mV/div
Li
0.5A/div
V_OUT
50mV/div
V_BATT
50mV/div
Figure 21. SP6644/6201 DC/DC LDO Output Ripple
Voltage (Vout=3.3V), Rlim=2.5k, Li=22µH Sumida CD-
43, Refer to Figure 30
Figure 22. Load Transient Response, Vbatt=1.3V,
(Vout=3.3V), Rlim=2.5k, Li=22µH Sumida CD-43
V_OUT
50mV/div
V_BATT
1V/div
Li
0.2A/div
V_OUT, V_LX,V_BATT
1V/div
Figure 23. Line Transient Response, (Vout=3.3V),
Rlim=2.5k, Iload=22µH Sumida CD-43
Figure 24. Switching Waveforms, (Vout=3.3V),
Vbatt=1.3V, Rlim=2.5k, Iload=10mA, Li=22µH Sumida
CD-43
Date: 11/30/04
SP6644/6645 High Efficiency Boost Regulator
© Copyright 2004 Sipex Corporation
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