LT3003 반도체 회로 부품 판매점
3-Channel LED Ballaster
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 Linear Technology |
www.DataSheet4U.com
FEATURES
■ 3% LED Current Matching
■ Up to 350mA Continuous Current per LED String
■ Up to 3000:1 True Color PWMTM Dimming Range
■ PWM Input Disconnects LED Strings
■ Can Operate in Buck, Boost and Buck-Boost Modes
■ Wide Input Range: 3V to 40V
■ Overtemperature Outputs
■ Works with LT1618, LT3477, LT3474, LT3475,
LT3476, LTC®3783
■ Thermally Enhanced 10-Pin MSOP Package
APPLICATIONS
■ High Power LED Ballaster
■ Automotive Lighting
■ Video Cameras
■ TFT LCD Backlighting
LT3003
3-Channel LED
Ballaster with PWM
DESCRIPTION
The LT®3003 drives three separate strings of LEDs up
to 350mA/channel with 3% accurate current matching,
resulting in uniform LED brightness and intensity. This
approach is superior to conventional methods of running
three separate channels with external ballast resistors
requiring expensive factory calibration.
The LT3003 operates in boost, buck and buck-boost mode.
A True Color PWM Dimming ratio of up to 3000:1 is achiev-
able using a logic-level signal at the PWM pin for all modes
without the need for external level-shifting circuitry. For
applications with input supply above and below the output
voltage of the LED strings, the LT3003 allows the LEDs to
be returned to the input supply (buck-boost mode) instead
of being limited to only SEPIC solutions.
The LT3003 is ideal for high power LED driver applications
such as TFT LCD backlighting and heads-up displays. Ad-
ditional overtemperature outputs allow appropriate system
management for increased reliability.
The LT3003 is available in a small 10-pin MSE package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technolology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Buck Mode LT3003 with the LT3476
PVIN
32V
1µF
0.1Ω
8 × 3 = 24 LEDs
350mA PER STRING
VIN
3V TO 16V
10µF
PWM
DIMMING
LED1
VMAX
LED2
LED3
VIN
SHDN LT3003
PWM
GND OT1 OT2
VEE
1µF
CAP LED
PWM
VIN SIMPLIFIED LT3476
GND
VC
SW
0.33µF
1nF 10µH
3003 TA01a
Efficiency
90
85
80
75
70
65
PVIN = 32V
NUMBER OF LEDS = 8 × 3 = 24
60
0 200 400 600 800
1000
TOTAL LED CURRENT (mA)
1200
3003 TA01b
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LT3003www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN ............................................................................40V
LED1, LED2, LED3 ....................................................48V
VMAX, SHDN..............................................................48V
VIN – VEE ...................................................................36V
VEE ............................................................................36V
PWM ......................................................................... 15V
OT1, OT2.....................................................................6V
Operating Junction Temperature Range
(Notes 2, 3, 4)........................................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
LED1 1
LED2 2
10 VEE
9 SHDN
LED3 3 11 8 OT2
VMAX 4
VIN 5
7 OT1
6 PWM
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 35°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER MSE PART MARKING
LT3003EMSE
LTCFF
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. PWM = 1V, VMAX = 4V, VIN = 3V, VEE = 0V, ILED2 = 100mA,
OT1 = OT2 = Open, SHDN = VIN.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Operational Input Voltage
Minimum (VIN – VEE)
VIN Quiescent Current
VIN Shutdown Current
VMAX Quiescent Current
SHDN Pin Threshold
LED Current Matching
|LED2 – LED1|, |LED2 – LED3| LED Current
Matching with LED Pin Voltage Mismatch
LED Pin Voltage
VEE = 0V, ILED1,2,3 = 100mA
VEE = 4V, ILED1,2,3 = 100mA
VEE = 0V to 36V
PWM = 1V, ILED1,2,3 = 100mA
PWM = 0V, VLED1 = VLED2 = VLED3
SHDN = 0V, ILED1,2,3 = 0mA
PWM = 1V, ILED2 = 100mA
PWM = 0V, VLED1 = VLED2 = VLED3
ILED2 = 100mA, VLED1 = VLED2 = VLED3
ILED2 = 350mA, VLED1 = VLED2 = VLED3
ILED2 = 350mA,
(|VLED2 – VLED1| + |VLED2 – VLED3|) = 700mV
ILED2 = 100mA
●3
36
40
2.7 3
10.5
470 600
2 4 10
55 90
20 300
● 0.25
0.7
1
–3 0 +3
–3.5 0.5 +3.5
0.7 0.8 0.9
V
V
V
mA
µA
µA
µA
nA
V
%
%
V
LED1, LED2, LED3 Maximum Current
LED1, LED2, LED3 Maximum Leakage Current
PWM Switching Threshold
Turn-On Delay (PWM On to ILED On)
VLED1,2,3 < 1.5V
PWM = 0V, VLED1,2,3 = 48V
ILED1,2,3 = 100mA
PWM = 0V to 1V, ILED > 50mA
375 500 550
0.1 1
● 0.3 0.5 0.7
2
mA
µA
V
µs
VEE Pin Current in Buck Mode
PWM = 0V, VMAX = 40V, VIN = 39V, VEE = 36V
0.1 1
µA
Overtemperature Sense Point (OT1, OT2)
(Note 4)
125 °C
Overtemperature Hysteresis Point
(Note 5)
–6° from Overtemp
Sense Point
°C
OT1 Pull-Down Current
OT1 = 0.3V (Note 4)
100 µA
3003fa
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LT3003 led
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