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LTM8042/LTM8042-1
μModule Boost LED Driver
and Current Source
FEATURES
DESCRIPTION
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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
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.
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Tiny, Low Profile (9mm × 15mm × 2.82mm)
Surface Mount LGA Package
# WHITE LEDS
6
LED CURRENT
1A
12V IN
LTM8042
24V IN
APPLICATIONS
7
8
350mA
1A
LTM8042-1
LTM8042
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Display Backlighting
9
350mA
LTM8042-1
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Automotive and Avionic Lighting
Illumination
Scanners
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
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.
TYPICAL APPLICATION
μModule Boost LED Driver, Driving 8 White LEDs at 1A
UP TO 26.8V
compliant.
97
Efficiency vs V IN
V IN
16V TO 26V
V CC LTM8042
RUN
BSTIN/BKLED –
LED +
TG
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93
PWM
SYNC
TGEN
BSTOUT/BKIN
1A
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90
4.7μF
SS
RT
GND CTL
33.2k
f SW = 550kHz
4.7μF
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87
16 17 18 19 20 21 22 23 24 25 26
V IN (V)
80421 TA01a
80421 TA01b
80421fa
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