LM3648YFFR datasheet(6/38 Pages) TI1

Part #	LM3648YFFR

Description	Synchronous Boost LED Flash Driver

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Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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LED Code (dec #)

0

8

16

24

32

40

48

56

64

72

80

88

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

D031

TA = -40C

TA = 25C

TA = 85C

VIN (V)

2.5

3

3.5

4

4.5

5

5.5

1.4

1.42

1.44

1.46

1.48

1.5

1.52

1.54

1.56

1.58

1.6

1.62

D021

TA = -40GC

TA = +25GC

TA = +85GC

LED Code (dec#)

0

16

32

48

64

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

D001

TA = -40°C

TA = +25°C

TA = +85°C

LED Code (dec#)

0

16

32

48

64

80

96

112

128

0

0.04

0.08

0.12

0.16

0.2

0.24

0.28

0.32

0.36

0.4

D015

TA = -40°C

TA = +25°C

TA = +85°C

SCL

SDA_IN

SDA_OUT

t 5

t 1

t 4

t 3

t

2

LM3648, LM3648TT

SNVSA68B – OCTOBER 2014 – REVISED SEPTEMBER 2015

www.ti.com

6.7 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ƒSW

Switching frequency

2.5 V

≤ VIN ≤ 5.5 V

–6%

4

6%

MHz

Figure 1. I2C-Compatible Interface Specifications

6.8 Typical Characteristics

TA = 25°C, VIN = 3.6 V, HWEN = VIN, CIN = COUT = 2 × 10 µF and L = 1 µH, unless otherwise noted.

Figure 3. LED Torch Current vs Brightness Code

Figure 2. LED Flash Current vs Brightness Code

LM3648TT

ƒSW = 2 MHz

Flash

Brightness Code = 0x3F

Figure 4. LED Torch Current vs Brightness Code

Figure 5. LED Current vs Input Voltage

6

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