Power Management

LTM4607

Linear Technology

關Module Boost LED Driver and Current Source

Manufacturer: Linear Technology

Document: 32 Pages / 267Kb

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Technical content

µModule Boost LED Driver and Current Source The L TM®8042 is a complete μModule® Boost LED Driver specifically designed to drive LEDs up to 1A, while the L TM8042-1 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 L TM8042/L TM8042-1 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 LED CURRENT 12V IN 24VIN 6 1A L TM8042 7 350mA L TM8042-1 8 1A L TM8042 9 350mA L TM8042-1 The L TM8042/L TM8042-1 is packaged in a thermally enhanced, compact overmolded land grid array (LGA) package. The L TM8042/L TM8042-1 is Pb-free and a RoHS compliant. μModule Boost LED Driver , Driving 8 White LEDs at 1A

APPLICATIONS

n T rue 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 T ransient 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 n Display Backlighting n Automotive and Avionic Lighting n Illumination n Scanners Efficiency vs VIN L, L T , L TC, L TM, Linear Technology, the Linear logo and μModule are registered trademarks and T rue Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. VIN (V) EFFICIENCY (%) 1918

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BSTIN/BKLED– PWM SYNC TGEN SS V IN 16V TO 26V LED+ TG BSTOUT/BKIN 4.7μF 33.2k fSW = 550kHz 4.7μF UP TO 26.8V

PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS Internal Operating Temperature (Note 1) ABCDEF BANK 1 BANK 3 BANK 4 TG BANK 5 BSTOUT/BKIN LED + BANK 2 GND G RUN SYNC RT SS PWM HJKL TGEN CTL VCC LGA PACKAGE 77-LEAD (15mm s 9mm s 2.82mm) BSTIN/BKLED– TJMAX = 125°C, θJA = 15.7°C/W , θJCtop = 13.6°C/W , θJCbottom = 4.5°C/W , θJB = 9.4°C/W θ VALUES DETERMINED PER JESD 51-12 WEIGHT = 1.1g ORDER INFORMATION LEAD FREE FINISH TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L TM8042EV#PBF L TM8042EV#PBF L TM8042V 77-Lead (15mm × 9mm × 2.82mm) LGA –40°C to 125°C L TM8042IV#PBF L TM8042IV#PBF L TM8042V 77-Lead (15mm × 9mm × 2.82mm) LGA –40°C to 125°C L TM8042EV-1#PBF L TM8042EV-1#PBF L TM8042-1V 77-Lead (15mm × 9mm × 2.82mm) LGA –40°C to 125°C L TM8042IV-1#PBF L TM8042IV-1#PBF L TM8042-1V 77-Lead (15mm × 9mm × 2.82mm) LGA –40°C to 125°C Consult L TC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container . For more information on lead free part marking, go to: http://www.linear .com/leadfree/ This product is only offered in trays. For more information go to: http://www.linear .com/packaging/

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Absolute maximum voltage at V CC, RUN, PWM, TGEN, BSTIN/ BKLED– pins is 40V for non-repetitive one second transients and 30V for continuous operation. Note 3: The L TM8042E/L TM8042E-1 are guaranteed to meet performance specifications from 0°C to 125°C ambient. Specifications over the full –40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with statistical process controls. The l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V , buck mode with 4Ω load. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC(MIN) Minimum Input DC Voltage l 3V ILED L TM8042 LED Current L TM8042-1 LED Current CTL Open CTL Open, RCTL = 6.81k RCTL = 6.81k 0.9 0.45 0.34 0.17 0.5 1.05 0.55 0.39 0.20 A A A A V CLAMP Open LED Clamp Voltage Boost Mode, LED + Open 36 V ΔIOUT/IOUT Output Current Line Regulation L TM8042, 6V < BSTOUT/BKIN < 30V L TM8042-1, 6V < BSTOUT/BKIN < 30V 0.5 0.5 IQVCC VCC Supply Current PWM = 0V RUN = 0V 4.2 0.1 1 mA μA fSW Switching Frequency RT = 90.9k RT = 22.1k RT = 6.04k 0.22 0.68 1.7 0.25 0.8 0.27 0.92 2.3 MHz MHz MHz I SS Soft-Start Pin Current SS = 0.5V , Out of Pin 6 9 12 μA fSYNC Synchronization Frequency Range 0.3 2.5 MHz ISYNC SYNC Pull-Down Current (Into the Pin) V SYNC = 2V 60 μA VSYNC(IL) SYNC Input Low 0.4 V VSYNC(IH) SYNC Input High 1.5 V ICTL CTL Input Bias Current CTL = 0V , Flows Out of Pin 100 μA VRUN(IH) RUN Input Voltage High 1.5 V VRUN(IL) RUN Input Voltage Low 0.4 V IRUN RUN Pin Bias Current 60 100 μA VPWM(IH) PWM Input Voltage High 1.5 V VPWM(IL) PWM Input Voltage Low 0.4 V IPWM PWM Pin Bias Current 60 120 μA VTG(OH) TG Output High Voltage Relative to LED +, 100k from LED+ to TG 0 V VTG(OL) TG Output Low Voltage Relative to LED +, 100k from LED+ to TG –7 V VTGEN(IH) TGEN Input Voltage High PWM = 0V 1.5 V VTGEN(IL) TGEN Input Voltage Low 0.4 V ITGEN TGEN Pin Bias Current 100 200 μA The L TM8042I/L TM8042I-1 are guaranteed to meet specifications over the full –40°C to 125°C internal operating temperature range. Note that the maximum internal temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. Note 4: This device includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum internal operating temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.

TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs VIN, Boost Operation, 16.7V at 1A LED String Efficiency vs VIN, Boost Operation, 20.1V at 1A LED String Efficiency vs VIN, Boost Operation, 23.4V at 1A LED String Efficiency vs VIN, Boost Operation, 26.8V at 1A LED String Efficiency vs VIN, Buck Mode, 3.5V at 1A LED String Efficiency vs VIN, Buck Mode, 6.8V at 1A LED String Efficiency vs VIN, Boost Operation, 6.8V at 1A LED String Efficiency vs VIN, Boost Operation, 10.1V at 1A LED String Efficiency vs VIN, Boost Operation, 13.4V at 1A LED String TA = 25°C, unless otherwise noted. L TM8042 VIN (V) EFFICIENCY (%)

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VIN (V) EFFICIENCY (%)

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VIN (V) EFFICIENCY (%) 109

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VIN (V) EFFICIENCY (%) 1413

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VIN (V) EFFICIENCY (%) 1713

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VIN (V) EFFICIENCY (%) 1514

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VIN (V) EFFICIENCY (%) 1918

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VIN (V) EFFICIENCY (%) 1816

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14 2010861 2 2 6 2422 30 32 28 34 VIN (V) EFFICIENCY (%) 1816

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14 2010 12 26 2422 30 32 28 34

TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs VIN, Buck-Boost Mode, 3.6V at 1A LED String Efficiency vs VIN, Buck-Boost Mode, 6.8V at 1A LED String Efficiency vs VIN, Buck-Boost Mode, 10.1V at 1A LED String Efficiency vs VIN, Buck Mode, 10.1V at 1A LED String Efficiency vs VIN, Buck Mode, 13.4V at 1A LED String Efficiency vs VIN, Buck Mode, 16.7V at 1A LED String TA = 25°C, unless otherwise noted. Maximum LED Current vs Input Voltage, Boost Operation L TM8042 Efficiency vs VIN, Buck-Boost Mode, 13.4V at 1A LED String VIN (V) EFFICIENCY (%) 1816

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VIN (V) EFFICIENCY (%)

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VIN (V) EFFICIENCY (%)

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VIN (V) EFFICIENCY (%) 2624

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20 22 28 301086 1 21 41 61 8 VIN (V) EFFICIENCY (%) 262422

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VIN (V) EFFICIENCY (%) 242322

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VIN (V) EFFICIENCY (%)

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INPUT VOLTAGE (V) MAXIMUM LED CURRENT (mA) 2015 1200

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7.4V AT 1A 10.9V AT 1A 14.5V AT 1A 18.1V AT 1A 21.4V AT 1A 24.8V AT 1A 28.2V AT 1A

TYPICAL PERFORMANCE CHARACTERISTICS LED Current vs CTL Voltage Quiescent Current vs Input Voltage, Open LED Junction Temperature Rise vs Load, Boost Operation, 8.3V at 1A LED String Maximum LED Current vs V IN, Buck Mode Maximum LED Current vs Input Voltage, Buck-Boost Mode Junction Temperature Rise vs Load, Boost Operation, 18.1V at 1A LED String Junction Temperature Rise vs Load, Boost Operation, 13.6V at 1A LED String Junction Temperature Rise vs Load, Boost Operation, 10.9V at 1A LED String VIN (N) LED CURRENT (mA) 2015 1000

80421 G18

3.8V AT 1A 7.4V AT 1A 10.9V AT 1A 14.5V AT 1A 18.1V AT 1A 21.4V AT 1A 24.8V AT 1A INPUT VOLTAGE (V) MAXIMUM LED CURRENT (mA) 1200

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7.4V AT 1A 10.9V AT 1A 14.5V AT 1A 18.1V AT 1A 21.4V AT 1A 24.8V AT 1A 28.2V AT 1A ADJUST VOLTAGE (mV) LED CURRENT SCALING (%) 800600 100