Diodes Incorporated AL8812FDF-13

Overview

AL8812FDF-13 from Diodes Incorporated is a monolithic boost/buck DC-DC converter IC with integrated 60V/3.6A MOSFET, designed for dimmable MR16 LED lamps. It operates from 3.0V–20V input, delivers adjustable output voltage, supports up to 100 kHz switching frequency, and features precision 2% internal reference and active current limiting.

For engineers reviewing the AL8812FDF-13 datasheet, AL8812FDF-13 pinout, AL8812FDF-13 application, or AL8812FDF-13 equivalent, this device is selected for low-component-count LED driver designs requiring thermal stability, low standby current, and direct MOSFET integration in U-DFN6040-12 packaging.

Technical Context

The AL8812 integrates a temperature-compensated 1.25V reference, comparator, controlled-duty-cycle oscillator with timing capacitor (CT) control, Darlington output switch, and high-current MOSFET-enabling self-contained buck or boost topologies without external power switches. Its SENSE pin monitors peak inductor current for cycle-by-cycle limiting.

Switching operation is governed by charge/discharge currents into the TIMING pin (Ichg = 30 μA typ, Idischg = 200 μA typ), setting fosc between 24–42 kHz at CT = 1.0 nF. The GATE, DRAIN, SOURCE, SW/C, and SW/E pins provide full access to internal power stage terminals for flexible layout and thermal management via exposed drain pad.

Key Specifications

Pinout & Package

AL8812FDF-13 is housed in a thermally enhanced U-DFN6040-12 package (6.0 × 4.0 mm, 0.6 mm height) with dual exposed drain pads (PAD1 and PAD2) connected internally to DRAIN and GND respectively for optimized heat dissipation and EMI control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DC-DC converter applications.

Compared with AL8812FDF-13, AL8820FDF-13 offers higher voltage headroom but sacrifices MR16-optimized thermal performance and low-frequency noise immunity, while MP2482DJ-LF-Z provides higher efficiency in buck-only use cases but omits the Darlington-based flexibility needed for dimmable MR16 topologies.

Availability

AL8812FDF-13 is available at Aetrix Electronics and suitable for dimmable MR16 LED lamp drivers, low-voltage buck LED systems, and general-purpose adjustable DC-DC converters requiring stable component supply, thermal reliability, and integrated power switch functionality.

Supply support for AL8812FDF-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 analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AL8812 belongs to Diodes' LED driver IC product line, engineered specifically for cost-sensitive, thermally constrained AC/DC and DC/DC LED lighting applications-including retrofit MR16 lamps-where integration, efficiency, and reliability are prioritized over programmability.

FAQ

What is the maximum output power achievable with AL8812FDF-13 in a typical MR16 application?

AL8812FDF-13 supports up to 10 W output in well-designed buck or boost configurations, validated at 82 % efficiency delivering 500 mA at 24 V output from 24 V input. Thermal derating begins above +85 °C ambient due to θ_JA = 47.31 °C/W; PCB copper area under exposed pads is critical to sustain full power.

Can AL8812FDF-13 operate in both buck and boost topologies without external MOSFETs?

Yes - the integrated 60 V/3.6 A MOSFET and Darlington switch enable standalone buck operation (using SW/C and SW/E) and boost operation (using DRAIN, SOURCE, and external diode). No external power transistor is required; only passive components (inductor, diode, capacitors, resistors) must be added per topology.

How is output voltage adjusted, and what is the minimum feedback resistor value?

Output voltage is set via a resistor divider from output to INPUT (Pin 3), referenced to the internal 1.25 V bandgap. Minimum R1 (top resistor) is 10 kΩ to limit bias current error; typical designs use R1 = 20 kΩ and R2 = 10 kΩ for 3.75 V output. Divider current should exceed 10× INPUT pin bias (≤100 nA) for accuracy.

Does AL8812FDF-13 include thermal shutdown or overvoltage protection?

No - AL8812FDF-13 does not integrate thermal shutdown or output overvoltage protection. It provides current limiting via SENSE pin and has absolute maximum ratings (e.g., T_MJ = +150 °C), but system-level protection (e.g., NTC monitoring, Zener clamping) must be implemented externally for robust MR16 lamp operation.