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The AL3353 is a highly integrated and cost effective Light Emitting Diode (LED) controller optimized for LCD monitor and LCD TV backlighting application. It provides a high performance LED backlight solution with low BOM cost.

The AL3353 contains a PWM boost driver which uses current mode control and fixed frequency operation to regulate the LED current.The LED current is sensed through an external current sense resistor.The voltage across the sensing resistor is compared with reference level of 400mV, the error is amplified to control the pulse width of the power switch thus to regulate the current flowing the LED.

The AL3353 offers PWM to analog dimming mode for a wide range of dimming control.

The AL3353 has comprehensive protection features and it is available in the SO-8 package.


  • LCD TV/Monitor backlighting driver
  • Flat panel display
  • Commercial LED lighting


  • Wide Input Voltage Range: 9V to 40V
  • High Precision Feedback Reference Voltage: 400mV/+-1.5%
  • Current Mode PWM Controller with Good Dynamic Response
  • PWM to Analog Dimming Mode
  • Built-In Comprehensive Protections
    • Undervoltage Lock Out (UVLO)
    • Output Overvoltage Protection (OVP)
    • Power MOSFET Overcurrent Protection (OCP)
    • Diode and Inductor Short Protection
    • LED Cathode Short to GND Protection
    • LED Open Protection
    • VOUT Short Protection
    • Overtemperature Protection (OTP)

Product Specifications

Product Parameters

Function High Performance Boost LED Controller
Minimum Input Voltage 9 V
Maximum Input Voltage 40 V
Maximum Output Voltage External MOSFET V
Number of Regulated Output Channels 1
Maximum Output Current per Channel External MOSFET mA
Typical Over-Current Protection Current 500/RCS mA
Switching Frequency 0.12 MHz
Efficiency 94 %
Quiescent Current 2 mA
Standby Quiescent Current 130 µA
Dimming PWM to Analog
Soft Start Yes
VFB 0.4 V
Operating Temperature Range -40 to 105 °C

Technical Documents


SPICE/IBIS Model Documents


Evaluation Boards and User Guides

Recommended Soldering Techniques



Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AL3353S-13 Arrow Electronics Central EU 4000 5/26/2020 Buy Now Germany
AL3353S-13 Digi-Key Electronics 3411 5/26/2020 Buy Now United States
AL3353S-13 Mouser Electronics Inc. 4439 5/26/2020 Buy Now United States


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