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LM3492-Q1

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Automotive 2-channel individual dimmable LED driver with boost converter and fast current regulator

Product details

Number of channels 2 Topology Boost with Current Sink Rating Automotive Operating temperature range (°C) -40 to 125 Vin (min) (V) 4.5 Vin (max) (V) 65 Vout (min) (V) 5 Vout (max) (V) 63 Iout (max) (A) 0.4 Iq (typ) (mA) 3.6 Switching frequency (max) (kHz) 1000 Features Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Power good, Soft Start, Thermal shutdown
Number of channels 2 Topology Boost with Current Sink Rating Automotive Operating temperature range (°C) -40 to 125 Vin (min) (V) 4.5 Vin (max) (V) 65 Vout (min) (V) 5 Vout (max) (V) 63 Iout (max) (A) 0.4 Iq (typ) (mA) 3.6 Switching frequency (max) (kHz) 1000 Features Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Power good, Soft Start, Thermal shutdown
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Boost Converter:
    • LM3492-Q1 is an Automotive Grade Product That is AEC Q100 Grade 1 Qualified
    • Very Wide Input Voltage Ranged From 4.5 V to 65 V
    • Programmable Soft Start
    • No Loop Compensation Required
    • Stable With Ceramic and Other Low ESR Capacitors With No Audible Noise
    • Nearly Constant Switching Frequency Programmable From 200 kHz to 1 MHz
  • Current Regulators:
    • Programmable LED Current from 50 mA to 200 mA
    • 1000:1 Contrast Ratio at a Dimming Frequency of More Than 3 kHz, Minimum LED Current Pulse Width is 300 ns
    • Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)
    • Dynamic Headroom Control Maximizes Efficiency
    • Over-Power Protection
    • ±3% Current Accuracy
  • Supervisory Functions:
    • Precision Enable
    • COMM I/O Pin for Diagnostic and Commands
    • Thermal Shutdown Protection
    • Thermally Enhanced 20-Pin HTSSOP package
  • Boost Converter:
    • LM3492-Q1 is an Automotive Grade Product That is AEC Q100 Grade 1 Qualified
    • Very Wide Input Voltage Ranged From 4.5 V to 65 V
    • Programmable Soft Start
    • No Loop Compensation Required
    • Stable With Ceramic and Other Low ESR Capacitors With No Audible Noise
    • Nearly Constant Switching Frequency Programmable From 200 kHz to 1 MHz
  • Current Regulators:
    • Programmable LED Current from 50 mA to 200 mA
    • 1000:1 Contrast Ratio at a Dimming Frequency of More Than 3 kHz, Minimum LED Current Pulse Width is 300 ns
    • Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)
    • Dynamic Headroom Control Maximizes Efficiency
    • Over-Power Protection
    • ±3% Current Accuracy
  • Supervisory Functions:
    • Precision Enable
    • COMM I/O Pin for Diagnostic and Commands
    • Thermal Shutdown Protection
    • Thermally Enhanced 20-Pin HTSSOP package

The LM3492/-Q1 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary Projected-On-Time control method to give a fast transient response with no compensation required, and a nearly constant switching frequency programmable from 200 kHz to 1 MHz. The application circuit is stable with ceramic capacitors and produces no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up, and an integrated 190 mΩ, 3.9-A N-Channel MOSFET switch minimizes the solution size.

The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable from 50 mA to 200 mA by a single resistor.

To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for backlight panels of different size, thereby reducing overall development time and cost. The LM3492/-Q1 comes with a versatile COMM pin which serves as a bidirectional I/O pin interfacing with an external MCU for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492/-Q1 include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The LM3492/-Q1 is available in the thermally enhanced 20-pin HTSSOP package.

The LM3492/-Q1 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary Projected-On-Time control method to give a fast transient response with no compensation required, and a nearly constant switching frequency programmable from 200 kHz to 1 MHz. The application circuit is stable with ceramic capacitors and produces no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up, and an integrated 190 mΩ, 3.9-A N-Channel MOSFET switch minimizes the solution size.

The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable from 50 mA to 200 mA by a single resistor.

To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for backlight panels of different size, thereby reducing overall development time and cost. The LM3492/-Q1 comes with a versatile COMM pin which serves as a bidirectional I/O pin interfacing with an external MCU for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492/-Q1 include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The LM3492/-Q1 is available in the thermally enhanced 20-pin HTSSOP package.

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Technical documentation

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Type Title Date
* Data sheet LM3492/-Q1 Two-Channel Individual Dimmable LED Driver With Boost Converter and Fast Current Regulator datasheet (Rev. D) PDF | HTML 31 Oct 2016
White paper LED Drivers for Automotive Exterior Applications (Rev. B) 27 Mar 2018
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
User guide AN-2056 LM3492 Evaluation Board Reference Design (Rev. B) 01 May 2013
Application note AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application (Rev. A) 01 May 2013

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Evaluation board

LM3492AR111DEMO — LM3492 AR111 LED Bulb Replacement Reference Board

The LM3492 demonstration board included in this package is designed for converting nominal 12VAC from electronic transformer output to drive seven series connected LEDs at 360- mA average current. The end user can directly light up a LED string through the demonstration board from an electronic (...)

Not available on TI.com
Evaluation board

LM3492EVAL — Two Channel Boost Regulator with DHC for LED Backlighting Evaluation Board

The LM3492 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15W and an output voltage of up to 65V. The boost converter employs a proprietary (...)

User guide: PDF
Not available on TI.com
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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HTSSOP (PWP) 20 View options

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