LM3533 datasheet(51/63 Pages) TI1

51 / 63 page

0.0

12.0

24.0

36.0

48.0

60.0

ILED (mA)

90.0

87.0

84.0

81.0

78.0

75.0

72.0

69.0

66.0

63.0

60.0

ILED (mA)

90.0

88.0

86.0

84.0

82.0

80.0

78.0

76.0

74.0

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

75.0

72.0

69.0

66.0

63.0

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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