VIN (V)

100

90

80

70

60

50

40

3.0

3.5

4.0

4.5

5.0

5.5

TA = +85°C

IOUT = 200 mA, 5.3V Fixed Voltage Mode

TA = -30°C and +25°C

BRC (#)

220

200

180

160

140

120

100

80

60

40

0

1

2

3

4

5

6

7

TA = +25°C

VIN = 3.6V, VLED = 3.3V

TA = +85°C

TA = -30°C

VOUT (V)

0.70

0.65

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

VIN = 5.5V

VIN = 4.2V

VIN = 2.7V

VIN = 3.0V

VIN = 3.6V

VOUT (V)

0.70

0.65

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

TA = -30°C

TA = +85°C

TA = +25°C

IOUT (A)

4.80

4.70

4.60

4.50

4.40

4.30

4.20

0.00

0.05

0.10

0.15

0.20

0.25

TA = -30°C, +25°C

VIN = 3.6V

TA = 85°C

4.80

4.70

4.60

4.50

4.40

4.30

4.20

IOUT (A)

4.75

4.70

4.65

4.60

4.55

4.50

4.45

4.40

4.35

4.30

4.25

0.00

0.05

0.10

0.15

0.20

0.25

VIN = 5.5V

VIN = 2.7V

TA = 25°C

VIN = 4.2V, 3.6V, 3.3V, 3.0V

4.75

4.70

4.60

4.65

4.40

4.30

4.25

4.55

4.50

4.45

4.35

7

LM3550

www.ti.com

SNVS569C – MAY 2009 – REVISED OCTOBER 2016

Product Folder Links: LM3550

Submit Documentation Feedback

Copyright © 2009–2016, Texas Instruments Incorporated

Typical Characteristics (continued)

Unless otherwise specified: TA = 25°C; VIN = 3.6 V; CIN = 4.7 µF, COUT = 2.2 µF, C1 = C2 = 1 µF. Super capacitor = 0.5 F

TDK EDLC272020-501-2F-50.

4.5-V Mode

Figure 6. Output Voltage vs Output Current

4.5-V Mode, Tri-Temp

Figure 7. Output Voltage vs Output Current

Figure 8. Input Current Limit vs Output Voltage

Figure 9. Input Current Limit vs Output Voltage Tri-Temp

5.3-V Mode

Figure 10. Converter Efficiency vs Input Voltage

Figure 11. Torch Current vs Brightness Code