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APM81803 Synchronous Buck Regulator Module

Allegro MicroSystems

APM81803: 40V, 3A, Synchronous Buck Regulator Module with Low EMI and 6μA Quiescent Current

The ALT80800 is a compact, high-efficiency, low EMI LED Driver for automotive lighting applications. It is a synchronous buck switching regulator that provides constant-current output to drive high-power LEDs. It integrates both high-side and low-side N-channel DMOS switches for DC-to-DC step-down conversion. Output current is user-selectable by an external current sense resistor, and output voltage is automatically adjusted to drive various numbers of LEDs in a single string.

Product Number: APM81803

Class: Clear Power Module,

Tag: Clear Power Module, Synchronous Buck Regulator Module

55Vin rating (60V abs max) – Can be used on traditional 12-V automotive, and 24-V trucks, and systems using a pre-boost supply followed by the ALT80800 to drive a high number of LEDs
Integrated FETs – No need for external FET(s) or Diode as part of the buck conversion, and higher efficiency
Switching frequency dithering for EMI reduction – pass OEM requirements and minimize associated components
5V Vcc can be used to source up to 14mA as a local rail (e.g., power a small uC) – potentially eliminate an LDO
PWM and Analog dimming options, including control for NTC temperature foldback or LED binning
Adjustable LED open fault mask setting for low VIN operation (dropout mode)

Typical Applications :
Automotive Lighting
Hi/Lo Beam and Matrix Headlights
Front and Rear Fog Lights
Daytime Running Lights
Turn/stop Lights
Dimmable Interior Lights
Other Automotive Lighting Applications

Part Number Type Output Current Topology Mounting Style Operating Frequency Dimming Applications Maximum Frequency Operating Temperature Voltage - Supply Package Type
APM81803 DC DC Regulator 2A Step-Down (Buck) Surface Mount 500kHz Analog, PWM Lighting - -40 °C ~ 125 °C(TA) 4.5V ~ 55V 16-Pin eTSSOP (suffix LP)

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    Datasheet Download on Jan, 2023

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