SP6645EU datasheet(6/15 Pages) EXAR

Part #	SP6645EU

Description	Single/Dual Alkaline Cell, High Efficiency

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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Date: 11/30/04

SP6644/6645 High Efficiency Boost Regulator

Figure 17. SP6644/6201 DC/DC LDO Combination

Efficiency vs. Output Current (Vout=3.3V), Rlim=2.5k,

Li=22

µH Sumida CD-43, Refer to Figure 30

Figure 18. SP6644/6201 LDO Line/Load Rejection vs.

Output Current (Vout=3.3V), Rlim=2.5k, Li=22

µH

Sumida CD-43, Refer to Figure 30

Figure 19. SP6644/6201 DC/DC LDO Maximum Load

Current vs. Vbatt (Vout=3.3V), Rlim=2.5k, Li=22

µH

Sumida CD-43, Refer to Figure 30

Figure 20. SP6644/6201 DC/DC LDO No-Load Ibatt vs.

Vbatt (Vout=3.3V), Rlim=2.5k, Li=22

µH Sumida CD-

43, Refer to Figure 30

Figure 21. SP6644/6201 DC/DC LDO Output Ripple

Voltage (Vout=3.3V), Rlim=2.5k, Li=22

µH Sumida CD-

43, Refer to Figure 30

Figure 22. Load Transient Response, Vbatt=1.3V,

(Vout=3.3V), Rlim=2.5k, Li=22

µH Sumida CD-43

Figure 23. Line Transient Response, (Vout=3.3V),

Rlim=2.5k, Iload=22

µH Sumida CD-43

Figure 24. Switching Waveforms, (Vout=3.3V),

Vbatt=1.3V, Rlim=2.5k, Iload=10mA, Li=22

µH Sumida

CD-43

Refer to the circuit in

Figure 28, T

AMB = +25

oC unless otherwise noted.

30

40

50

60

70

80

90

100

0.1

1.0

10.0

100.0

1000.0

Iload (mA)

Vb=1.0V

Vb=1.3V

Vb=2.0V

Vb=2.6V

Vb=3.2V

3.032

3.033

3.034

3.035

3.036

3.037

020 40

6080 100 120 140 160 180 200

Iload (mA)

Vb=1.3V

Vb=2.6V

0

20

40

60

80

100

120

140

160

180

200

220

240

0.0

1.0

2.0

3.0

4.0

Vbatt (V)

10

100

1000

10000

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Vbatt (V)

SP6201 Out

10mV/div

SP6644 Out

20mV/div

Li

0.5A/div

V

OUT

50mV/div

V

BATT

50mV/div

V

OUT

50mV/div

V

BATT

1V/div

Li

0.2A/div

V

OUT, VLX,VBATT

1V/div

PERFORMANCE CHARACTERISTICS

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