Diodes Incorporated AL88902QFVBW-13

Overview

AL88902QFVBW-13 from Diodes Incorporated is a 60V AEC-Q100 Grade 1 synchronous buck DC-DC converter with integrated 120mΩ high-side and 55mΩ low-side MOSFETs, delivering up to 2.5A continuous output current, 95% peak efficiency at 12V input, and adjustable switching frequency from 300kHz to 2.5MHz. It supports both constant-voltage and constant-current operation in automotive LED lighting systems.

For engineers reviewing the AL88902QFVBW-13 datasheet, AL88902QFVBW-13 pinout, AL88902QFVBW-13 application, or AL88902QFVBW-13 equivalent, key selection criteria include its 3.8–60V input range, 0.8V feedback reference, programmable soft-start via SS/TR, and dual-mode (PWM/PEM) control enabled by MSYNC pin configuration.

Technical Context

This device implements current-mode control with internal compensation, enabling stable loop response across wide load and input voltage variations. Its architecture integrates a precision 0.8V feedback reference, programmable oscillator (via FS resistor or external sync), and dedicated BIAS pin for improved light-load efficiency when VOUT ≥ 5V.

The functional block includes zero-crossing detection, valley current limiting, hiccup-mode overcurrent protection, and open-drain power-good (PG) signaling with 5MΩ internal pull-up. Thermal shutdown activates at +165°C with +20°C hysteresis, and UVLO triggers at 3.5V with 50mV hysteresis.

Key Specifications

Pinout & Package

AL88902QFVBW-13 uses the wettable U-QFN4040-16/SWP (Type UXB) package: 4.0mm × 4.0mm body, 0.4mm pitch, exposed thermal pad (EP) for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MPQ4420AGL-A-Z, AL88902QFVBW-13 delivers automotive-grade reliability and 60V operation; versus LM61480QRNRRQ1, it offers smaller 4.0×4.0mm footprint and superior light-load efficiency-critical for LED lighting duty cycles with long off-periods.

Availability

AL88902QFVBW-13 is available at Aetrix Electronics and suitable for automotive infotainment, exterior LED lighting systems, and motor control bias supplies requiring stable component supply across extended temperature and lifecycle demands.

Supply support for AL88902QFVBW-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 solutions for automotive, industrial, computing, and consumer markets.

The AL8890Q/AL88902Q product line targets high-reliability automotive power conversion, emphasizing AEC-Q100 compliance, wide-input operation, and compact high-frequency design for LED lighting and infotainment subsystems.

FAQ

What is the maximum recommended PCB copper weight and thermal via count for the EPAD of AL88902QFVBW-13?

Per datasheet thermal resistance characterization, the U-QFN4040-16/SWP package requires a 1"² FR-4 board with 2oz copper and multiple thermal vias (minimum 9×0.3mm diameter) connecting the exposed pad to inner ground planes. This configuration achieves θ_JA = 32°C/W and ensures junction temperature remains below +150°C at 2.5A full load in +85°C ambient.

Can AL88902QFVBW-13 operate in constant-current mode without external op-amps or current sense resistors?

Yes. The device supports native CC operation by applying a reference voltage to the SS/TR pin while configuring FB as current-sense input via a shunt resistor. The internal error amplifier regulates the voltage across the shunt to maintain 0.8V, thereby controlling LED current directly-no external amplification or sensing ICs are needed.

How does the BIAS pin improve efficiency, and what is the minimum VOUT required to use it?

The BIAS pin reduces quiescent current by powering the internal LDO from VOUT instead of VIN when VOUT exceeds 4.5V (rising threshold). For 5V–15V outputs, tying BIAS to VOUT cuts IQ from ~75μA to ~43μA. Below 4.5V, BIAS must connect to PGND or a ≥4.5V auxiliary rail with 1µF local decoupling.

What failure modes trigger the PG pin, and how is its timing characterized?

PG asserts low during soft-start, output undervoltage (<90% nominal), overvoltage (>110% nominal), or thermal shutdown. Its rising edge delay is 1.5ms after regulation is achieved; falling edge delay is 2μs. Internal 5MΩ pull-up ensures defined logic-high state when not actively driven.