AS3685B datasheet(7/25 Pages) TAOS

Part #	AS3685B

Description	Ultra Small High Efficiency 1000mA Charge Pump

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Manufacturer	TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]

Direct Link	http://www.taosinc.com

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7 / 25 page

AS3685A/AS3685B

Datasheet

www.austriamicrosystems.com/

AS3685

(ptr)

Revision 2.2

6 - 24

6

Typical Operation Characteristics

Figure

2 – Efficiency vs. Battery Voltage (with Lumiled PWF1)

40

50

60

70

80

90

100

2.8

3.2

3.6

4.0

4.4

4.8

5.2

VBAT [V]

ILED=700m

ILED=600m

ILED=500m

ILED=400m

ILED=300m

ILED=200m

ILED=100m

ILED=50m

Figure

3 – Battery Current vs. Battery Voltage (with Lumiled PWF1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

2.8

3.2

3.6

4.0

4.4

4.8

5.2

VBAT [V]

ILED=700m

ILED=600m

ILED=500m

ILED=400m

ILED=300m

ILED=200m

ILED=100m

ILED=50m

Figure

4 – LED current I(ILED) vs. Battery Voltage (with Lumiled PWF1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

2.83.23.64.04.44.85.2

VBAT [V]

ILED=700m

ILED=600m

ILED=500m

ILED=400m

ILED=300m

ILED=200m

ILED=100m

ILED=50m

Figure

5 – Linearty of Current Sink

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.0

0.5

1.0

1.5

2.0

2.5

VILED [V]

ILED=700m

ILED=600m

ILED=500m

ILED=400m

ILED=300m

ILED=200m

ILED=100m

ILED=50m

Figure

6 –I(ILED) vs. R(ISET) (Flash and Torch Mode of AS3685A)

0

200

400

600

800

1000

1200

0k

20k

40k

60k

80k

100k

120k

140k

RISET [Ohm]

Flash Mode

Torch Mode

Figure

7 – Startup of AS3685A -- ILED Current

ILED 500mA/div 100µs/div

VBAT=3.3V, ILED=700mA

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