Description

The AL5873 is a three-channel linear LED driver with PWM dimming and analog dimming control. Each channel can drive up to 250mA with a total driving current up to 750mA. The LED channel current of the AL5873 can be set through two reference resistors connected to the REF1 and REF2 pins. The AL5873 regulates LED current for each channel, accurate down to ±4%, with excellent dimming performance. The AL5873 enters standby mode to save power if no PWM signal is detected. The AL5873 monitors the temperature and reduces the LED current if the chip temperature exceeds the threshold temperature. Moreover, the input under voltage lock-out (UVLO), LED string open/short protection, over temperature protection (OTP), and fault indicator (FAULTB) are designed to improve system robustness. The AL5873 is available in TSSOP-16EP (Type DX) package.

Feature(s)

Wide Input Voltage Range from 5V to 55V
Each Channel up to 250mA Current Capability
Set Stop and Tail Current Independently Through Two Resistors
Switch LED Current Between Stop and Tail Function
Automatically via FULL Input
PWM Dimming via Both PWM Input and Power Supply
Analog Dimming via ADIM Input
Automatically Enter and Exit Standby Mode Without Enable Pin

Application(s)

Automotive aftermarket LED inner lamps
Aftermarket rear lights – tail and stop lights, rear turn indicators,
parking lights, fog lights, reverse lights

Specifications & Technical Documents

Product Parameters

AEC Qualified	No
Compliance (Only Automotive Supports PPAP)	Standard
Topology	Linear LED Driver
Minimum Supply Voltage (V)	5 V
Maximum Supply Voltage (V)	55 V
Maximum V_{OUT (V)}	55 V
Number of Channels	3
Low Dropout VSAT (mV)	300@100mA (Typ) mV
Output Current (mA)	250 mA
Channel Max. Output Current (mA)	250 mA
Accuracy (%)	4 %
Control Interface/Protocols	PWM
Diagnosis & Protection	Fault Pin, LED Open/Short, OTP
Dimming (Analog)	Yes
Dimming (PWM)	Yes
Temperature Range (°C)	-40 to 125 °C
Moisture Sensitivity Level (MSL)	1

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products

AL5873