Diodes Incorporated
SO 8

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Automotive-Compliant 40V Boost/SEPIC Controller

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The AL8853AQ is an automotive AEC-Q100 highly integrated and costeffective boost controller and single-ended primary-inductance controller (SEPIC). It provides a high-performance LED lighting solution with low BOM (bill of material) cost.

The AL8853AQ contains a PWM (pulse-width modulation) boost/SEPIC control which uses current-mode 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 200mV. The error is amplified to control the pulse width of the power switch thus to regulate the current flowing into the LED.

The AL8853AQ offers PWM converted to analog DC dimming mode for a wide range of dimming control.

The AL8853AQ has comprehensive protection features such as power MOSFET overcurrent protection (OCP), output overvoltage protection (OVP), diode & inductor short protection, LED cathode short to GND protection, IC power-supply undervoltage lockout (UVLO), LED open protection, VOUT short protection and overtemperature protection (OTP).

The AL8853AQ is available in the SO-8 package.


  • AEC-Q100 Grade 1 Qualified
  • Wide Input-Voltage Range: 6.0V to 40V
  • High-Precision Feedback Reference Voltage: 200mV/±3%
  • Current-Mode PWM Controller with Good Dynamic Response
  • PWM to Analog Dimming Mode
  • Fixed 400kHz Switching Frequency
  • Built-In Comprehensive Protections
    • Undervoltage Lockout (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)
  • Available in Pb-Free SO-8 package
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AL8853AQ is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Automotive LED lamps
  • Fog lights, reversing lights, daytime running lights
  • Head lamps
  • Auto head-up displays
  • Infotainment and cluster backlight displays
  • DC-DC power conversion

Product Specifications

Product Parameters

AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Topologies (Buck) No
Topologies (Buck-Boost) No
Topologies (Boost) Yes
Topologies (Charge Pump) No
Minimum Input Voltage (V) 6
Maximum Input Voltage (V) 40
Maximum Output Voltage (V) Ext MOSFET
Maximum LED Current (A) Ext MOSFET
LED Current Accuracy (%) 3
Switching Frequency Maximum (kHz) 400
Dimming (PWM) Yes
Dimming (Analog) No
Efficiency (%) 95
Operating Temperature Range (°C) -40 to 125
Sense Voltage (mV) 200
AEC-Q100 Grade 1

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