Diodes Incorporated AL5890-15D-13

Overview

AL5890-15D-13 from Diodes Incorporated is a 400V constant-current linear LED driver in TO252 (Standard) package, delivering a factory-trimmed 15mA output with ±1.5mA typical accuracy over −40°C to +105°C ambient. It supports both high-side and low-side LED string configurations, features thermal foldback activation at +130°C junction temperature, and operates with a minimum 7V turn-on voltage across IN–OUT pins. Used in commercial downlights and emergency lighting where compact, resistorless current regulation is required.

For engineers reviewing the AL5890-15D-13 datasheet, AL5890-15D-13 pinout, AL5890-15D-13 application, or AL5890-15D-13 equivalent, this page provides verified technical context, package-specific thermal data, real-world current accuracy vs. VIN_OUT curves, thermal foldback behavior, and validated alternative options for LED current regulation at up to 400V.

Technical Context

The AL5890-15D-13 implements a bandgap-referenced linear regulator architecture with internal current-sense feedback, enabling stable 15mA output without external resistors. Its functional block includes a voltage regulator, precision bandgap reference, and current-sense amplifier driving an output pass element.

It operates in series with the LED string, regulating current by dropping excess input voltage across its internal pass transistor. Thermal foldback begins at TJ = +130°C, linearly reducing output current to limit power dissipation and prevent thermal runaway under high ambient or poor heatsinking conditions.

Key Specifications

Pinout & Package

AL5890-15D-13 is housed in a TO252 (Standard) thermally enhanced surface-mount package with exposed pad for heatsinking. The package measures 6.10mm × 6.58mm × 1.59mm (D × E × L), and the exposed pad is electrically isolated (NC).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Compared with AL5809-15D-13 and NSI45015AT1G, the AL5890-15D-13 uniquely combines 400V operation, factory-trimmed 15mA accuracy, and autonomous thermal foldback in a single TO252 package-enabling simpler, safer, and higher-voltage LED systems without added protection circuitry.

Availability

AL5890-15D-13 is available at Aetrix Electronics and suitable for commercial downlights, emergency lighting systems, and outdoor signage modules requiring stable component supply, long-term lifecycle support, and RoHS/halogen-free compliance.

Supply support for AL5890-15D-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and lighting applications.

The AL5890 product line delivers cost-effective, resistorless constant-current LED drivers optimized for commercial and industrial lighting where reliability, thermal resilience, and high-voltage string compatibility are critical.

FAQ

What is the minimum input-to-output voltage required for AL5890-15D-13 to regulate?

The AL5890-15D-13 requires a minimum voltage difference of 7V between its IN and OUT pins to initiate regulation. Below this threshold, the device remains off and passes negligible current. This value is confirmed in the Recommended Operating Conditions table (VIN_OUT min = 7V) and verified across temperature in Figure 5 and Figure 8 of the datasheet.

Can AL5890-15D-13 be used in high-side and low-side configurations interchangeably?

Yes-the AL5890-15D-13 supports both configurations without modification. In high-side mode, IN connects to the positive rail and OUT to the LED anode; in low-side mode, IN connects to the LED cathode and OUT to ground. Pin functionality remains identical; only PCB routing changes. Figures 14–17 in the datasheet validate both topologies.

How does thermal foldback behave in AL5890-15D-13, and is it reversible?

Thermal foldback activates at +130°C junction temperature, linearly reducing output current to limit power dissipation. As junction temperature decreases, current fully recovers to 15mA without hysteresis or latch-off. This behavior is documented in Figure 19 and described in Section 10 of the datasheet as "self-adaptive control" with no external intervention required.

Is AL5890-15D-13 compatible with PWM dimming, and what are the timing limitations?

Yes-AL5890-15D-13 supports PWM dimming via rapid ON/OFF cycling of the IN–OUT voltage. Its turn-on delay is ≤6µs and turn-off delay ≤0.3µs (per Electrical Characteristics table), enabling clean dimming at frequencies up to 100kHz. However, thermal mass of the TO252 package limits effective duty-cycle resolution at very low frequencies (<100Hz) due to thermal inertia.