LTM8042 Datasheet, PDF (1/32 Pages) Linear Technology – μModule Boost LED Driver and Current Source

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
12V_IN
LTM8042
LTM8042-1
24V_IN
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
V_IN
16V TO 26V
4.7μF
V_{CC LTM8042}
RUN
BSTIN/BKLED^–
LED⁺
TG
PWM BSTOUT/BKIN
SYNC
TGEN
SS
RT
GND CTL
33.2k
f_SW = 550kHz
UP TO 26.8V
1A
4.7μF
80421 TA01a
Efficiency vs V_IN
97
96
95
94
93
92
91
90
89
88
87
16 17 18 19 20 21 22 23 24 25 26
V_IN (V)
80421 TA01b
80421fa
1