LM3533 datasheet(51/63 Pages) TI1

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0.0

12.0

24.0

36.0

48.0

60.0

ILED (mA)

90.0

87.0

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75.0

72.0

69.0

66.0

63.0

60.0

ILED (mA)

90.0

88.0

86.0

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80.0

78.0

76.0

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72.0

70.0

0.0

12.0

24.0

36.0

48.0

60.0

ILED (mA)

90.0

87.0

84.0

81.0

78.0

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72.0

69.0

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60.0

LM3533

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SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015

VIN = 3.6 V, LEDs are WLEDs part number SML-312WBCW(A), typical application circuit with L = TDK (VLF302512, 4.7 µH,

10 µH, 22 µH where specified), Schottky = On-Semi (NSR0240V2T1G), TA = 25°C, unless otherwise specified. Efficiency is

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

L = 10 µH

VIN = 3.6 V

ƒSW = 1 MHz

L = 10 µH

VIN = 3.6 V

ƒSW = 500 kHz

Top To Bottom: 2×4, 2×5, 2×6, 2×7, 2×8, 2×9, 2×10 (LEDs)

Figure 51. Efficiency vs ILED

Figure 50. Efficiency vs ILED

L = 4.7 µH

VIN = 3.6 V

ƒSW = 1 MHz

Top To Bottom: 2×4, 2×5, 2×6, 2×7, 2×8, 2×9, 2×10 (LEDs)

Figure 52. Efficiency vs ILED

9 Power Supply Recommendations

The LM3532 is designed to operate from an input supply range of 2.7 V to 5.5 V. This input supply must be well-

regulated and provide the peak current required by the LED configuration and inductor selected.

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