Diodes Incorporated AL5815W5-7

Overview

AL5815W5-7 from Diodes Incorporated is a 5-terminal adjustable constant-current linear LED controller in SOT25 package, designed to drive external bipolar transistors or MOSFETs for medium-to-high-current LED strings. It operates from 4.5V to 60V input, regulates LED current via 200mV feedback reference (±4% tolerance), features built-in ENB pin with 85µs turn-on delay, and supports low-frequency PWM dimming ≤200Hz in commercial and industrial lighting systems.

For engineers reviewing the AL5815W5-7 datasheet, AL5815W5-7 pinout, AL5815W5-7 application, or AL5815W5-7 equivalent, this device is selected for stable current regulation in high-input-voltage LED driver designs where thermal shutdown (160°C), UVLO (4.2V), and low quiescent current (0.25mA) are critical design constraints.

Technical Context

The AL5815W5-7 implements a precision error amplifier with 50kHz bandwidth and 5A/V transconductance, regulating output current by maintaining 0.2V across an external sense resistor. Its internal 15mA source/sink driver directly controls base/gate of external power transistors without requiring external compensation components.

It integrates under-voltage lockout (4.2V rising threshold), over-temperature shutdown (160°C with 30°C hysteresis), and ENB-active-low logic with internal 1.3–2.7MΩ pull-down resistor. Startup soft-start prevents inrush current, and shutdown supply current is limited to 3–20µA.

Key Specifications

Pinout & Package

SOT25 package: 5-pin surface-mount, 1.6mm × 2.8mm footprint, 1.3mm height, JEDEC standard outline with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear LED controller applications.

Compared with AL5816W5-7, AL5815W5-7 provides controlled startup for inrush-sensitive loads; compared with NSI45020AZT1G, it offers adjustable current, dimming, and external transistor drive-making it suitable for scalable, medium-power LED systems.

Availability

AL5815W5-7 is available at Aetrix Electronics and suitable for commercial lighting, industrial control panels, and exterior signage requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AL5815W5-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and LED driver solutions for industrial and automotive markets.

The AL5815/AL5816 product line delivers adjustable linear LED control with high-voltage tolerance and thermal robustness, targeting cost-sensitive yet thermally demanding lighting applications where simplicity and reliability are prioritized over switching efficiency.

FAQ

What is the maximum input voltage supported by AL5815W5-7?

The AL5815W5-7 supports a maximum input voltage of +60V on the VCC pin, with absolute maximum rating up to +65V. Operation above 60V is outside recommended conditions and may compromise reliability or lifetime. The device includes under-voltage lockout that activates below 4.2V to prevent unstable regulation.

Can AL5815W5-7 drive multiple LED strings in parallel?

Yes-AL5815W5-7 can drive multiple LED strings in parallel using a single sense resistor shared across matched external transistors and identical sense resistors. Current matching relies on transistor and resistor matching; mismatch greater than ±5% degrades channel-to-channel current balance.

How does the ENB pin function for dimming control?

The ENB pin is active-low: pulling it below 0.4V turns on the OUT driver, while raising it above 2.5V places the device in low-quiescent shutdown (3–20µA). Applying a low-frequency square wave (<200Hz) to ENB achieves analog-equivalent dimming; higher frequencies cause incomplete turn-off due to 85µs turn-on delay.

What thermal considerations apply when using AL5815W5-7 in SOT25 package?

In SOT25, AL5815W5-7 has θ_JA = 134°C/W on a 1"×1" FR-4 board with 2oz copper and no thermal vias. At 15mA output drive and 60V input, power dissipation in the IC itself remains low (<100mW), but external transistor selection and PCB copper area must manage total system heat-especially when driving high-current LEDs with large V_DS.