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.

• 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

• Input voltage (type)
• DC/DC
• Topology
• Boost, Boost with Current Sink, Multi-Channel
• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 65
• Iout (Max) (A)
• 0.2
• Iq (Typ) (mA)
• 3.6
• Features
• Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Power Good, Soft Start, Thermal Shutdown
• Operating temperature range (C)
• -40 to 125
• Dimming method
• PWM

LM3492的完整型号有：LM3492MH/NOPB、LM3492MHX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3492MH/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：73个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3492MH/NOPB的批量USD价格：1.576（1000+）

LM3492MHX/NOPB，工作温度：-40 to 125，封装：HTSSOP (PWP)-20，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3492MHX/NOPB的批量USD价格：1.313（1000+）

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