SP6685 datasheet(7/16 Pages) SIPEX

7 / 16 page

Date: 7/6/06 Rev B

SP6685, 700mA Buck/BoostCharge Pump LED Driver

TYPICAL PERFORMANCE CHARACTERISTICS

Output Current Vs Supply Vol

100

150

200

250

300

350

400

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V

Flash 300mA Vf = 3.85

Torch 150mA Vf = 3.45

Efficiency Vs Supply Vol

100

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V

Flash 300m

Vf = 3.85V

Torch 150mA

Vf = 3.45V

Battery Current Vs Supply Vo

100

200

300

400

500

600

700

800

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V

Flash 300mA Vf = 3.8

Torch 150mA Vf = 3.4

D1 = AOT 3228HPW0303B LED, Rsense = 0.33ohms,

SET = 162K, CIN = 4.7μF, CFC = 0.47μF, COUT = 1μF

Figure 17.

Figure 18.

Figure 13.

Figure 14.

Figure 15.

Figure 16.

Efficiency Vs Supply Vol

100

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V

Flash Mode

700mA Vf =

3.45V

Torch Mode

200mA Vf = 3.

Output Current Vs Supply Vol

100

200

300

400

500

600

700

800

900

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V

Flash 700mA Vf = 3

Torch 200mA Vf = 3.

D1 = Luxeon LXCL-PWFI LED, Rsense = 0.22ohms,

SET = 88.7K, CIN = 4.7μF, CFC = 1.0μF, COUT = 1.0μF

Battery Current Vs Supply Vo

200

400

600

800

1000

1200

1400

1600

1800

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V

Flash 700mA Vf = 3.

Torch 200mA Vf = 3.

Note: diode, resistor, and capacitor settings apply to

figures 13, 14, and 15.

Note: diode, resistor, and capacitor settings apply to

figures 16, 17, and 18.

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