Diodes Incorporated AL5814MP-13

Overview

AL5814MP-13 from Diodes Incorporated is an 8-terminal linear LED controller IC designed to drive external bipolar transistors or MOSFETs in medium-to-high-current LED applications. It operates from 4.5V to 60V input, delivers up to 15mA output drive current, features VSET-based current setting with ±4% reference voltage tolerance, and integrates LED-open detection via VFAULT pin with 2.5V threshold. It is used in automotive rear combination lights and instrumentation illumination.

For engineers reviewing the AL5814MP-13 datasheet, AL5814MP-13 pinout, AL5814MP-13 application, or AL5814MP-13 equivalent, key selection considerations include its 60V input capability, thermal fold-back support via NTC on VSET, PWM dimming through VFAULT, and MSOP-8EP package with exposed pad for thermal management.

Technical Context

The AL5814MP-13 implements a precision feedback loop where the FB pin is regulated to match the voltage set at VSET using an internal error amplifier (Gm = 4 A/V, BW = 50 kHz). Its VFAULT pin provides open-load detection by monitoring voltage drop across the external transistor's collector/drain - triggering output disable when pulled below 2.5V.

LED current is configured via resistor divider between REF (0.4V ±4%) and VSET; thermal fold-back is enabled by substituting R6 with an NTC thermistor. SFAULT pin enables configurable LED-open detection activation voltage (e.g., 5.01V with 9.1kΩ), preventing false triggers during power-up.

Key Specifications

Pinout & Package

The AL5814MP-13 is housed in a thermally enhanced MSOP-8EP package with exposed pad (EP) for improved heat dissipation. The EP must be soldered to a large-area contiguous GND plane but cannot serve as the sole electrical GND connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL5817MP-13, the AL5814MP-13 eliminates the EN pin to simplify board layout and reduce BOM cost where enable timing is not critical; versus LM3409HVMM/NOPB, it trades efficiency for EMI-free operation and design simplicity in sub-5W LED loads.

Availability

AL5814MP-13 is available at Aetrix Electronics and suitable for automotive rear lighting, LED signage, instrumentation illumination, and refrigerator interior lighting requiring stable component supply and long-lifecycle support.

Supply support for AL5814MP-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 manufacturer of discrete semiconductors and integrated circuits, specializing in high-reliability power management, signal integrity, and lighting solutions.

The AL5814MP-13 belongs to Diodes' linear LED driver product line, engineered for thermally robust, EMI-free constant-current control in automotive and industrial lighting where switching noise must be avoided.

FAQ

What is the maximum LED string voltage the AL5814MP-13 can support?

The AL5814MP-13 does not directly drive LEDs - it controls external transistors. The maximum LED string voltage is limited only by the breakdown voltage of the external MOSFET or BJT used. With a 60V VCC supply and proper transistor selection (e.g., 100V+ drain-source rating), LED strings up to ~55V are feasible while maintaining safe headroom for dropout and transients.

Can the AL5814MP-13 drive multiple LED strings independently?

No - it regulates total current through a single sense resistor shared across parallel strings. For matched current distribution, external transistors and sense resistors must be closely matched (e.g., 1% tolerance), and layout symmetry is critical. Independent per-string regulation requires one AL5814MP-13 per channel or a multi-channel IC like AL5816.

How is thermal fold-back implemented using the VSET pin?

VSET accepts a resistor divider where one leg is an NTC thermistor. As temperature rises, NTC resistance drops, lowering VSET voltage. Since FB is regulated to match VSET, LED current decreases proportionally - e.g., a 10kΩ NTC at 25°C dropping to 3kΩ at 85°C reduces current by ~70%, preventing thermal runaway without software.

Is the MSOP-8EP package lead-free and RoHS compliant?

Yes - the AL5814MP-13 is fully RoHS 3 compliant (2015/863/EU), lead-free, halogen-free, and antimony-free per Diodes Incorporated's "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb). The MSOP-8EP package uses matte tin lead finish and meets JEDEC J-STD-020 reflow profiles.