VIN (V)

5.50

5.25

5.00

4.75

4.50

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

IOUT = 100 mA

I OUT = 300 mA

IOUT = 700 mA

IOUT = 500 mA

TA = +25°

VIN (V)

2.40

2.00

1.60

1.20

0.80

90

80

70

60

50

2.9

3.4

3.9

4.5

5.0

5.5

IIN

äLED

VLED = 3.7V and ILED = 1A

VIN (V)

1.1

1.1

1.0

1.0

0.9

3.0

3.5

4.0

4.5

5.0

5.5

TA = +85°C

TA = +25°C

TA = -30°C

VLED = 3.7V @ +25°C

VIN (V)

5.250

5.125

5.000

4.875

4.750

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

TA = +25°C

TA = -30°C

TA = +85°C

IOUT = 500 mA

BRIGHTNESS CODE (#)

1.6

1.2

0.8

0.4

0.0

0

32

64

96

128

TA = -30°C and +25°C

TA = +85°C

VLED = 3.5V @1.2A

VIN (V)

1.4

1.3

1.2

1.1

1.0

3.0

3.5

4.0

4.5

5.0

5.5

TA = +85°C

TA = +25°C

TA = -30°C

VLED = 3.65V @ +25°C

LM3553

SNVS414B – FEBRUARY 2008 – REVISED MAY 2013

www.ti.com

Typical Performance Characteristics

Unless otherwise specified: TA = 25°C; VIN = 3.6V; VM/F = VIN; RSET = 16.5kΩ; CIN= 10µF, COUT = 10µF;L = 2.2µH; VFB bit =

CL bit = '0'; OVP bit = '0' for 1 LED and VFB = '1' for two series LEDs;.

Maximum LED Drive Current @ VIN = 3.6V

1.2A Flash Line Regulation

Figure 3.

Figure 4.

1.0A Flash Line Regulation

Voltage Mode Line Regulation

Figure 5.

Figure 6.

Input Current and LED Efficiency

Voltage Mode Load Regulation

with 1A Flash Current

Figure 7.

Figure 8.

6

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