0.50

0.70

0.90

1.10

1.30

1.50

1.70

VIN (V)

C001

85°C

-40°C

25°C

0.90

0.91

0.92

0.93

0.94

0.95

0.96

0.97

0.98

0.99

1.00

1.01

VIN (V)

C001

-40°C

85°C

25°C

70.0%

72.0%

74.0%

76.0%

78.0%

80.0%

82.0%

84.0%

86.0%

88.0%

90.0%

92.0%

0

12

24

36

48

60

ILED (mA)

3s3p

4s3p

5s3p

6s3p

C004

C004

70.0%

72.0%

74.0%

76.0%

78.0%

80.0%

82.0%

84.0%

86.0%

88.0%

90.0%

0

12

24

36

48

60

ILED (mA)

3s3p

4s3p

5s3p

6s3p

C003

70%

72%

74%

76%

78%

80%

82%

84%

86%

88%

90%

92%

2.5

3

3.5

4

4.5

5

5.5

VIN (V)

3s3p

4s3p

5s3p

6s3p

C013

70%

72%

74%

76%

78%

80%

82%

84%

86%

88%

90%

2.5

3

3.5

4

4.5

5

5.5

VIN (V)

3s3p

4s3p

5s3p

6s3p

C012

LM3699

www.ti.com

SNVS821A – JANUARY 2014 – REVISED MARCH 2014

8.2.3 Application Performance Plots

VIN = 3.6 V, LEDs are WLEDs part # SML-312WBCW(A), Typical Application Circuit with L = TDK (VLF302512, 10 µH, 22 µH

where specified), Schottky = On-Semi (NSR0240V2T1G), TA = 25°C unless otherwise specified. Efficiency is given as (VOUT ×

(IHVLED1 + IHVLED2+ IHVLED3))/(VIN × IIN), matching curves are given as (ΔILED_MAX/ILED_AVE).

L = 22 µH

20 mA/String

L = 10 µH

20 mA/String

Figure 9. Boost Efficiency vs VIN

Figure 10. Boost Efficiency vs VIN

Figure 11. LED Efficiency vs ILED

Figure 12. LED Efficiency vs ILED

Figure 13. Shutdown Current vs VIN

Figure 14. Open Loop Current Limit vs VIN

Copyright © 2014, Texas Instruments Incorporated

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