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Automotive-Grade, Low-EMI, 1.5 A PWM Dimmable Synchronous Buck LED Module

APM80900, APM80904

ClearPower NB Package

ECAD Models
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Description

Top Features

Packaging

The APM80900 and APM80904 are complete synchronous buck switching regulator ClearPower modules that provide constant current for driving high-power LEDs. They integrate both high-side and low-side switches along with the inductor, the input capacitor, and the boot capacitor. Current regulation is achieved on a cycle-by-cycle methodology that utilizes varying the on-time.

The maximum output current is easily adapted to the application with the use of an external current sense resistor. The output voltage automatically adjusts to the match the total Vf of the LED string. This ensures the optimal system efficiency. LED dimming is accomplished by a direct logic input pulse width modulation (PWM) signal. 

Expanding it's feature set, the APM80904 includes programmable internal dimming.

The analog dimming input (ADIM pin) can be used to calibrate the LED current or implement thermal foldback in conjunction with an external NTC thermistor.

The APM80900 and APM80904 are automotive AEC-Q100 qualified and presented in a compact, thermally enhanced 4 mm × 6 mm × 2 mm QFN-32 package with wettable flanks.

 
  • Source current up to 1.5 A for high current LEDs 
  • Integrated inductor and capacitors
  • Capable of Driving 1 to 6 series WLEDs (APM80900)
  • Peak Efficiency of 90%
  • Ultra-low EMI signature
  • High frequency (fSW > 2 MHz) switching with a Spread spectrum
  • Synchronous rectification with integrated high-side and low-side MOSFETs
  • High side current source, ILED accuracy ±3%
  • Dimming via external PMW or EN Pin - Programmable internal PWM dinning (APM80904) - Analog dimming for brightness calibration and thermal foldback
  • FAULT flag output
  • Small solution footprint (140mm2)

Typical Applications: 

The APM80900 and APM80904 are automotive AEC-Q100 qualified and presented in a compact, thermally enhanced 4 mm x 6 mm x 2 mm QFN-32 package (suffix NB) with wettable flanks.

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Part Number Specifications and Availability

Documentation and Resources

Documentation

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Documents Found: 32
Document Type Document Name
Application Note
Design Considerations in Selection of Converter Configuration for Automotive LED Headlight Applications
Brochure
Brochure: ClearPower LED Driver Modules
Technical Article
Allegro MicroSystems’ ClearPower Modules Tackle Designers’ Toughest Challenges