LTM8042EV-1PBF datasheet, PDF - EEWORLD Datasheet

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LTM8042/LTM8042-1

µModule Boost LED Driver

and Current Source

FEATURES

n

DESCRIPTION

The LTM

®

8042 is a complete μModule

®

Boost LED Driver

specifically designed to drive LEDs up to 1A, while the

LTM8042-1 drives up to 350mA. It combines a boost

power topology with a unique current loop to operate as

a constant-current source. The PWM input provides as

much as 3000:1 LED dimming, while 10:1 analog dimming

can be accomplished by a single resistor or analog voltage

applied to the CTL pin. As with any boost topology, the

LTM8042/LTM8042-1 has an uninterrupted current path

between its input and output and is thus intolerant to a

short-circuit or overload from the output to ground.

# WHITE LEDS

6

7

8

9

LED CURRENT

1A

350mA

1A

350mA

12V

IN

LTM8042

LTM8042-1

LTM8042

LTM8042-1

24V

IN

n

True Color PWM™ with 3000:1 Dimming Ratio

Operates in Boost, Buck Mode or Buck-Boost Mode

Wide Input Voltage Range:

Operation from 3V to 30V

Transient Protection to 40V

Gate Driver for Optional PWM Dimming with

P-channel MOSFET

Adjustable Frequency: 250kHz to 2MHz

Constant-Current and Constant-Voltage Regulation

Low Shutdown Current: <1μA

RoHS Compliant Package with Gold Pad Finish

Tiny, Low Profile (9mm

×

15mm

×

2.82mm)

Surface Mount LGA Package

APPLICATIONS

n

Display Backlighting

Automotive and Avionic Lighting

Illumination

Scanners

L,

LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks

and True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners.

The LTM8042/LTM8042-1 is packaged in a thermally

enhanced, compact overmolded land grid array (LGA)

package. The LTM8042/LTM8042-1 is Pb-free and a RoHS

compliant.

TYPICAL APPLICATION

μModule Boost LED Driver, Driving 8 White LEDs at 1A

UP TO 26.8V

V

IN

16V TO 26V

V

CC

RUN

BSTIN/BKLED

–

PWM

SYNC

TGEN

4.7μF

SS

RT

LTM8042

LED

+

TG

EFFICIENCY (%)

97

96

95

94

93

92

91

90

89

GND CTL

33.2k

f

SW

= 550kHz

4.7μF

88

87

16 17 18 19 20 21 22 23 24 25 26

V

IN

(V)

80421 TA01a

80421 TA01b

Efficiency vs V

IN

BSTOUT/BKIN

1A

80421fa

1

LTM8042/LTM8042-1

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

BSTIN/BKLED

–

TG

7

V

CC

BANK 2

6

BSTOUT/BKIN

5

4

BANK 1

3

GND

2

1

A

B

C

D

E

F

G

H

J

K

SS PWM

L

CTL

TGEN

LED

+

BANK 3

BANK 4

BANK 5

V

CC

, RUN, PWM, TGEN, BSTIN/BKLED

–

...................40V

BSTOUT/BKIN, TG, LED

+

..........................................43V

TG Pin Below LED

+

...................................................10V

CTL, SYNC, SS............................................................6V

RT ...............................................................................3V

Internal Operating Temperature

(Notes 3, 4) ........................................... –40°C to 125°C

Solder Temperature .............................................. 245°C

Storage Temperature ............................. –55°C to 125°C

RUN SYNC RT

LGA PACKAGE

77-LEAD (15mm 9mm 2.82mm)

T

JMAX

= 125°C,

θ

JA

= 15.7°C/W,

θ

JCtop

= 13.6°C/W,

θ

JCbottom

= 4.5°C/W,

θ

JB

= 9.4°C/W

θ

VALUES DETERMINED PER JESD 51-12

WEIGHT = 1.1g

ORDER INFORMATION

LEAD FREE FINISH

LTM8042EV#PBF

LTM8042IV#PBF

LTM8042EV-1#PBF

LTM8042IV-1#PBF

TRAY

LTM8042EV#PBF

LTM8042IV#PBF

LTM8042EV-1#PBF

LTM8042IV-1#PBF

PART MARKING*

LTM8042V

LTM8042-1V

PACKAGE DESCRIPTION

77-Lead (15mm

×

9mm

×

2.82mm) LGA

77-Lead (15mm

×

9mm

×

2.82mm) LGA

77-Lead (15mm

×

9mm

×

2.82mm) LGA

77-Lead (15mm

×

9mm

×

2.82mm) LGA

TEMPERATURE RANGE

–40°C to 125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

This product is only offered in trays. For more information go to:

http://www.linear.com/packaging/

80421fa

2

LTM8042/LTM8042-1

ELECTRICAL CHARACTERISTICS

SYMBOL

V

CC(MIN)

I

LED

PARAMETER

Minimum Input DC Voltage

LTM8042 LED Current

LTM8042-1 LED Current

R

CTL

= 6.81k

V

CLAMP

ΔI

OUT

/I

OUT

I

QVCC

f

SW

Open LED Clamp Voltage

Output Current Line Regulation

V

CC

Supply Current

Switching Frequency

Boost Mode, LED

+

Open

LTM8042, 6V < BSTOUT/BKIN < 30V

LTM8042-1, 6V < BSTOUT/BKIN < 30V

PWM = 0V

RUN = 0V

RT = 90.9k

RT = 22.1k

RT = 6.04k

SS = 0.5V, Out of Pin

V

SYNC

= 2V

1.5

CTL = 0V, Flows Out of Pin

1.5

0.4

60

1.5

0.4

60

Relative to LED

+

, 100k from LED

+

to TG

Relative to LED

+

, 100k from LED

+

to TG

PWM = 0V

1.5

0.4

100

200

0

–7

120

100

0.22

0.68

1.7

6

0.3

60

0.4

CTL Open

CTL Open, R

CTL

= 6.81k

The

l

denotes the specifications which apply over the full internal

operating temperature range, otherwise specifications are at T

A

= 25°C. V

CC

= 5V, buck mode with 4Ω load.

CONDITIONS

l

MIN

3

0.9

0.45

0.34

0.17

TYP

MAX

1.05

0.55

0.39

0.20

UNITS

V

A

V

%

0.5

36

0.5

4.2

0.1

0.25

0.8

2

9

1

0.27

0.92

2.3

12

2.5

mA

μA

MHz

μA

MHz

μA

V

μA

V

μA

V

μA

V

μA

I

SS

f

SYNC

I

SYNC

V

SYNC(IL)

V

SYNC(IH)

I

CTL

V

RUN(IH)

V

RUN(IL)

I

RUN

V

PWM(IH)

V

PWM(IL)

I

PWM

V

TG(OH)

V

TG(OL)

V

TGEN(IH)

V

TGEN(IL)

I

TGEN

Soft-Start Pin Current

Synchronization Frequency Range

SYNC Pull-Down Current (Into the Pin)

SYNC Input Low

SYNC Input High

CTL Input Bias Current

RUN Input Voltage High

RUN Input Voltage Low

RUN Pin Bias Current

PWM Input Voltage High

PWM Input Voltage Low

PWM Pin Bias Current

TG Output High Voltage

TG Output Low Voltage

TGEN Input Voltage High

TGEN Input Voltage Low

TGEN Pin Bias Current

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2:

Absolute maximum voltage at V

CC

, RUN, PWM, TGEN, BSTIN/

BKLED

–

pins is 40V for non-repetitive one second transients and 30V for

continuous operation.

Note 3:

The LTM8042E/LTM8042E-1 are guaranteed to meet performance

specifications from 0°C to 125°C ambient. Specifications over the full

–40°C to 125°C internal operating temperature range are assured by

design, characterization and correlation with statistical process controls.

The LTM8042I/LTM8042I-1 are guaranteed to meet specifications over

the full –40°C to 125°C internal operating temperature range. Note that

the maximum internal temperature is determined by specific operating

conditions in conjunction with board layout, the rated package thermal

resistance and other environmental factors.

Note 4:

This device includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed the maximum internal operating temperature

when overtemperature protection is active. Continuous operation above

the specified maximum operating junction temperature may impair device

reliability.

80421fa

3

LTM8042/LTM8042-1

TYPICAL PERFORMANCE CHARACTERISTICS

LTM8042

Efficiency vs V

IN

, Boost Operation,

6.8V at 1A LED String

90

89

88

EFFICIENCY (%)

87

86

85

84

83

82

81

80

4

5

V

IN

(V)

6

80421 G01

T

A

= 25°C, unless otherwise noted.

Efficiency vs V

IN

, Boost Operation,

13.4V at 1A LED String

95

94

Efficiency vs V

IN

, Boost Operation,

10.1V at 1A LED String

94

92

EFFICIENCY (%)

5

6

7

V

IN

(V)

80421 G02

93

92

91

90

89

88

87

90

88

86

84

82

80

8

9

10

86

85

7

8

9

10

V

IN

(V)

11

12

13

80421 G03

Efficiency vs V

IN

, Boost Operation,

16.7V at 1A LED String

97

94

92

EFFICIENCY (%)

90

88

86

84

82

80

8

9

10

11

12 13

V

IN

(V)

14

15

16

95

93

91

89

87

85

83

Efficiency vs V

IN

, Boost Operation,

20.1V at 1A LED String

97

95

93

EFFICIENCY (%)

91

89

87

85

83

11

12

13

14

15 16

V

IN

(V)

17

18

19

Efficiency vs V

IN

, Boost Operation,

23.4V at 1A LED String

12 13 14 15 16 17 18 19 20 21 22

V

IN

(V)

80421 G06

80421 G04

80421 G05

Efficiency vs V

IN

, Boost Operation,

26.8V at 1A LED String

97

96

95

EFFICIENCY (%)

94

93

92

91

90

89

88

87

16 17 18 19 20 21 22 23 24 25 26

V

IN

(V)

80421 G07

Efficiency vs V

IN

, Buck Mode,

3.5V at 1A LED String

89

87

EFFICIENCY (%)

4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34

V

IN

(V)

80421 G08

Efficiency vs V

IN

, Buck Mode,

6.8V at 1A LED String

94

92

90

88

86

84

82

80

8 10 12 14 16 18 20 22 24 26 28 30 32 34

V

IN

(V)

80421 G09

85

83

81

79

77

75

80421fa

4

LTM8042/LTM8042-1

TYPICAL PERFORMANCE CHARACTERISTICS

LTM8042

Efficiency vs V

IN

, Buck Mode,

10.1V at 1A LED String

95

94

93

EFFICIENCY (%)

92

EFFICIENCY (%)

91

90

89

88

87

86

85

12 14 16 18 20 22 24 26 28 30 32 34

V

IN

(V)

80421 G10

T

A

= 25°C, unless otherwise noted.

Efficiency vs V

IN

, Buck Mode,

16.7V at 1A LED String

97

96

95

EFFICIENCY (%)

94

93

92

91

90

89

88

87

Efficiency vs V

IN

, Buck Mode,

13.4V at 1A LED String

97

96

95

94

93

92

91

90

89

88

87

15 17 19 21 23 25 27 29 31 33

V

IN

(V)

80421 G11

19

21

23

25

27

V

IN

(V)

29

31

33

80421 G12

Efficiency vs V

IN

, Buck-Boost

Mode, 3.6V at 1A LED String

85

80

85

EFFICIENCY (%)

90

Efficiency vs V

IN

, Buck-Boost

Mode, 6.8V at 1A LED String

87

86

85

EFFICIENCY (%)

8

10 12 14 16 18 20 22 24 26

V

IN

(V)

80421 G14

Efficiency vs V

IN

, Buck-Boost

Mode, 10.1V at 1A LED String

75

70

65

60

55

4 6 8 10 12 14 16 18 20 22 24 26 28 30

V

IN

(V)

80421 G13

84

83

82

81

80

75

70

80

12 13 14 15 16 17 18 19 20 21 22 23 24

V

IN

(V)

80421 G15

Efficiency vs V

IN

, Buck-Boost

Mode, 13.4V at 1A LED String

90

89

88

EFFICIENCY (%)

87

86

85

84

83

82

81

80

15

16

17

18

V

IN

(V)

19

20

80421 G16

Maximum LED Current

vs Input Voltage, Boost Operation

1200

1000

800

600

400

200

0

5

10

15

20

INPUT VOLTAGE (V)

7.4V AT 1A

10.9V AT 1A

14.5V AT 1A

18.1V AT 1A

21.4V AT 1A

24.8V AT 1A

28.2V AT 1A

25

30

MAXIMUM LED CURRENT (mA)

80421 G17

80421fa

5

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