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PDF LTM8042-1 Data sheet ( Hoja de datos )
| Número de pieza | LTM8042-1 | |
| Descripción | uModule Boost LED Driver and Current Source | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n True Color PWM™ with 3000:1 Dimming Ratio
n Operates in Boost, Buck Mode or Buck-Boost Mode
n Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V
n Gate Driver for Optional PWM Dimming with
P-channel MOSFET
n Adjustable Frequency: 250kHz to 2MHz
n Constant-Current and Constant-Voltage Regulation
n Low Shutdown Current: <1μA
n RoHS Compliant Package with Gold Pad Finish
n Tiny, Low Profile (9mm × 15mm × 2.82mm)
Surface Mount LGA Package
APPLICATIONS
n Display Backlighting
n Automotive and Avionic Lighting
n Illumination
n 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.
LTM8042/LTM8042-1
µModule Boost LED Driver
and Current Source
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
12VIN
LTM8042
LTM8042-1
24VIN
LTM8042
LTM8042-1
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
VIN
16V TO 26V
4.7µF
VCC LTM8042
RUN
BSTIN/BKLED–
LED+
TG
PWM BSTOUT/BKIN
SYNC
TGEN
SS
RT GND CTL
33.2k
fSW = 550kHz
UP TO 26.8V
1A
4.7µF
80421 TA01a
Efficiency vs VIN
97
96
95
94
93
92
91
90
89
88
87
16 17 18 19 20 21 22 23 24 25 26
VIN (V)
80421 TA01b
For more information www.linear.com/LTM8042
80421fb
1
1 page  
LTM8042/LTM8042-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
LTM8042
1E0ff.i1ciVenact y1AvsLVEIDN,SBtruicnkg Mode,
1E3ff.i4ciVenact y1AvsLVEIDN,SBtruicnkg Mode,
1E6ff.i7ciVenact y1AvsLVEIDN,SBtruicnkg Mode,
95 97
97
94 96
96
93 95
95
92 94
94
91 93
93
90 92
92
89 91
91
88 90
90
87 89
89
86 88
88
85
12 14 16 18 20 22 24 26 28 30 32 34
VIN (V)
87
15 17 19 21 23 25 27 29 31 33
VIN (V)
87
19 21 23 25 27 29 31 33
VIN (V)
80421 G10
80421 G11
80421 G12
Efficiency vs VIN, Buck-Boost
Mode, 3.6V at 1A LED String
85
Efficiency vs VIN, Buck-Boost
Mode, 6.8V at 1A LED String
90
Efficiency vs VIN, Buck-Boost
Mode, 10.1V at 1A LED String
87
80
75
70
65
60
55
4 6 8 10 12 14 16 18 20 22 24 26 28 30
VIN (V)
80421 G13
85
80
75
70
8
10 12 14 16 18 20 22 24 26
VIN (V)
80421 G14
86
85
84
83
82
81
80
12 13 14 15 16 17 18 19 20 21 22 23 24
VIN (V)
80421 G15
Efficiency vs VIN, Buck-Boost
Mode, 13.4V at 1A LED String
90
89
88
87
86
85
84
83
82
81
80
15 16 17 18 19 20
VIN (V)
80421 G16
Maximum LED Current
vs Input Voltage, Boost Operation
1200
1000
800
600
400
200
0
0
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
5 10 15 20 25
INPUT VOLTAGE (V)
30
80421 G17
For more information www.linear.com/LTM8042
80421fb
5
5 Page 
LTM8042/LTM8042-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
LTM8042-1
Maximum LED Current vs Input
Voltage, Buck-Boost Mode
LED Current vs CTL Voltage
Quiescent Current vs Input
Voltage, Open LED
400 120
80
350 100
300
250 80
70
60
50
200 60
40
150
100
50
0
0
3.2V AT 350mA
6.3V AT 350mA
9.4V AT 350mA
12.4V AT 350mA
15.5V AT 350mA
18.6V AT 350mA
10 20 30
INPUT VOLTAGE (V)
Junction Temperature Rise
vs Load, Boost Operation,
6.8V at 350mA LED String
5
40
80421 G60
40
20
0
0 200 400 600 800 1000 1200
CTL VOLTAGE (mV)
Junction Temperature Rise
vs Load, Boost Operation,
9.4V at 350mA LED String
7
80421 G61
30
20
10
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
Junction Temperature Rise
vs Load, Boost Operation,
11.2V at 350mA LED String
8
80421 G62
4
3
5VIN
2
1
6
5
5VIN
4
3
2
1
7
6
5VIN
5
4
3
2
1
0
0 50 100 150 200 250 300 350
LED CURRENT (mA)
80421 G63
Junction Temperature Rise
vs Load, Boost Operation,
15.5V at 350mA LED String
14
12
10
5VIN
8
6
4
2
0
0 50 100 150 200 250 300 350
LED CURRENT (mA)
80421 G66
0
0 50 100 150 200 250 300 350
LED CURRENT (mA)
Junction Temperature Rise
vs Load, Buck Mode,
2.3V at 350mA LED String
10
80421 G64
9
8 24VIN
7
6
5
4 12VIN
3
2
1
0
0 50 100 150 200 250 300 350
LED CURRENT (mA)
80421 G67
0
0 50 100 150 200 250 300 350
LED CURRENT (mA)
Junction Temperature Rise
vs Load, Buck Mode,
3.2V at 350mA LED String
6
80421 G65
5
4
12VIN
3
2
5VIN
1
0
0 50 100 150 200 250 300 350
LED CURRENT (mA)
80421 G68
For more information www.linear.com/LTM8042
80421fb
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM8042-1.PDF ] | |
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