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LM3492HC-Q1

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Automotive high contrast 2-channel dimmable LED driver with boost converter and 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) 0.5 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) 0.5 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
    • Automotive Grade Product, Q100 Grade-1 Qualified
    • Very Wide Input Voltage Range: 4.5 V to 65 V
    • Programmable Soft-Start Period
    • 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 Regulator
    • Programmable LED Current: 50 mA to 250 mA
    • 10000:1 Contrast Ratio, 300-ns Minimum Pulse Width
    • 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 PWP, 20-Pin Package
  • Boost Converter
    • Automotive Grade Product, Q100 Grade-1 Qualified
    • Very Wide Input Voltage Range: 4.5 V to 65 V
    • Programmable Soft-Start Period
    • 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 Regulator
    • Programmable LED Current: 50 mA to 250 mA
    • 10000:1 Contrast Ratio, 300-ns Minimum Pulse Width
    • 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 PWP, 20-Pin Package

The LM3492HC/-Q1 device integrates a boost converter and a two-channel current regulator to implement a highly efficient and cost effective LED driver. This device drives 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. The nearly constant switching frequency can be set to a level from 200 kHz to 1 MHz. Ceramic capacitors stabilize the application circuit and produce no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up. 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 10000:1. The LED current can be set from 50 mA to 250 mA by a single resistor.

For all available packages, see the orderable addendum at the end of the data sheet.

All trademarks are the property of their respective owners.

To maximize the efficiency, (DHC) automatically adjusts the output voltage to a minimum. The DHC also facilitates a single BOM for different number of LED in a string, which is required for back-light panels of different size, thereby reducing overall development time and cost. The LM3492HC device includes a COMM pin that serves as a bidirectional I/O pin. The versatile COMM pin interface with an external micro-controller unit (MCU) is used for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the device include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The device is available in the thermally enhanced PWP, 20-pin package.

The LM3492HC/-Q1 device integrates a boost converter and a two-channel current regulator to implement a highly efficient and cost effective LED driver. This device drives 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. The nearly constant switching frequency can be set to a level from 200 kHz to 1 MHz. Ceramic capacitors stabilize the application circuit and produce no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up. 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 10000:1. The LED current can be set from 50 mA to 250 mA by a single resistor.

For all available packages, see the orderable addendum at the end of the data sheet.

All trademarks are the property of their respective owners.

To maximize the efficiency, (DHC) automatically adjusts the output voltage to a minimum. The DHC also facilitates a single BOM for different number of LED in a string, which is required for back-light panels of different size, thereby reducing overall development time and cost. The LM3492HC device includes a COMM pin that serves as a bidirectional I/O pin. The versatile COMM pin interface with an external micro-controller unit (MCU) is used for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the device include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The device is available in the thermally enhanced PWP, 20-pin package.

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Technical documentation

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Type Title Date
* Data sheet LM3492HC/-Q1 Two-Channel, Individual Dimmable, LED Driver With Boost Converter and Fast Current Regulator datasheet (Rev. B) PDF | HTML 29 Oct 2015
White paper LED Drivers for Automotive Exterior Applications (Rev. B) 27 Mar 2018
User guide AN-2231 LM3492HC Evaluation Board Reference Design (Rev. A) 01 May 2013

Design & development

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Evaluation board

LM3492HCEVM — LM3492HCEVM High Contrast Evaluation Module

The LM3492HC evaluation board drives 2 LED strings, each of which consists of 10 LEDs running at 150 mA with the forward voltage of each LED typically 3.8V. The input voltage is from 9V to 16V.
User guide: PDF
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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 Ultra Librarian

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