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LTM8042-1 fiches techniques PDF

Linear Technology - uModule Boost LED Driver and Current Source

Numéro de référence LTM8042-1
Description uModule Boost LED Driver and Current Source
Fabricant Linear Technology 
Logo Linear Technology 





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LTM8042-1 fiche technique
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

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