LTM8042/LTM8042-1
Module Boost LED Driver
and Current Source
FEATURES DESCRIPTION
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True Color PWM with 3000:1 Dimming Ratio The LTM 8042 is a complete Module Boost LED Driver
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Operates in Boost, Buck Mode or Buck-Boost Mode specifically designed to drive LEDs up to 1A, while the
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Wide Input Voltage Range: LTM8042-1 drives up to 350mA. It combines a boost
Operation from 3V to 30V power topology with a unique current loop to operate as
Transient Protection to 40V a constant-current source. The PWM input provides as
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Gate Driver for Optional PWM Dimming with much as 3000:1 LED dimming, while 10:1 analog dimming
P-channel MOSFET can be accomplished by a single resistor or analog voltage
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Adjustable Frequency: 250kHz to 2MHz applied to the CTL pin. As with any boost topology, the
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Constant-Current and Constant-Voltage Regulation LTM8042/LTM8042-1 has an uninterrupted current path
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Low Shutdown Current: <1A between its input and output and is thus intolerant to a
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RoHS Compliant Package with Gold Pad Finish short-circuit or overload from the output to ground.
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Tiny, Low Profile (9mm 15mm 2.82mm)
# WHITE LEDS LED CURRENT 12V 24V
IN IN
Surface Mount LGA Package
6 1A LTM8042
7 350mA LTM8042-1
APPLICATIONS 8 1A LTM8042
n 9 350mA LTM8042-1
Display Backlighting
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Automotive and Avionic Lighting
The LTM8042/LTM8042-1 is packaged in a thermally
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Illumination
enhanced, compact overmolded land grid array (LGA)
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Scanners
package. The LTM8042/LTM8042-1 is Pb-free and a
L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks
RoHS compliant.
and True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
TYPICAL APPLICATION
Module Boost LED Driver, Driving 8 White LEDs at 1A Efficiency vs V
IN
97
UP TO 26.8V
96
V
IN
V
CC LTM8042
16V TO 26V
95
+
LED
RUN
94
TG
BSTIN/BKLED
93
BSTOUT/BKIN
PWM
92
1A
SYNC
91
TGEN
90
SS
89
4.7F
RT GND CTL
88
4.7F
33.2k
87
f = 550kHz 16 17 18 19 20 21 22 23 24 25 26
SW
V (V)
IN
80421 TA01b
80421 TA01a
80421fb
1
For more information www.linear.com/LTM8042
EFFICIENCY (%)LTM8042/LTM8042-1
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
BSTIN/BKLED
V , RUN, PWM, TGEN, BSTIN/BKLED ...................40V
CC
TG
+
7
BSTOUT/BKIN, LED ................................................43V
V
BANK 2 BANK 3 BANK 4 BANK 5
CC
CTL, SYNC ..................................................................6V
6
+
BSTOUT/BKIN LED
Internal Operating Temperature
5
(Notes 3, 4) ........................................... 40C to 125C
4
Maximum Reflow Body Temperature .................. 245C
BANK 1
3 TGEN
Storage Temperature ............................. 55C to 125C
GND
2
CTL
1
A B C D E F G H J K L
RUN SYNC RT SS PWM
LGA PACKAGE
77-LEAD (15mm 9mm 2.82mm)
T = 125C, = 15.7C/W, = 13.6C/W,
JMAX JA JCtop
= 4.5C/W, = 9.4C/W
JCbottom JB
VALUES DETERMINED PER JESD 51-12
WEIGHT = 1.1g
ORDER INFORMATION
PART MARKING*
TEMPERATURE RANGE
PART NUMBER PAD OR BALL FINISH DEVICE FINISH CODE PACKAGE TYPE MSL RATING (Note 4)
LTM8042EV#PBF Au (RoHS) LTM8042V e4 LGA 3
40C to 125C
LTM8042IV#PBF Au (RoHS) LTM8042V e4 LGA 3
40C to 125C
LTM8042EV-1#PBF Au (RoHS) LTM8042V-1 e4 LGA 3
40C to 125C
LTM8042IV-1#PBF Au (RoHS) LTM8042V-1 e4 LGA 3
40C to 125C
Consult Marketing for parts specified with wider operating temperature Recommended LGA and BGA PCB Assembly and Manufacturing
ranges. *Device temperature grade is indicated by a label on the shipping
Procedures:
container. Pad or ball finish code is per IPC/JEDEC J-STD-609. www.linear.com/umodule/pcbassembly
LGA and BGA Package and T ray Drawings:
Terminal Finish Part Marking:
www.linear.com/packaging
www.linear.com/leadfree
80421fb
2
For more information www.linear.com/LTM8042