VIN (V)

100

90

80

70

60

50

40

2.5

3.0

3.5

4.0

4.5

5.0

5.5

TA = +25°C

VLED (V) = 3.0V

TA = +85°C

TA = -30°C

30

LM3555

SNVS594G – DECEMBER 2008 – REVISED APRIL 2016

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One LED at 80 mA

Figure 57. LED Efficiency vs Input Voltage

9 Power Supply Recommendations

The LM3555 is designed to operate from an input supply range of 2.5 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.