Diodes Incorporated AL8811M8-13

Overview

AL8811M8-13 from Diodes Incorporated is a monolithic DC-DC controller IC supporting boost, buck, and inverting topologies with 3.0–20V input range, 1.6A internal switch current, 100 kHz max switching frequency, and 2% precision reference. It integrates temperature-compensated reference, comparator, oscillator, current-limit circuit, driver, and high-current Darlington output switch-designed for low-component-count LED lighting and general-purpose converters.

For engineers reviewing the AL8811M8-13 datasheet, AL8811M8-13 pinout, AL8811M8-13 application, or AL8811M8-13 equivalent, key selection considerations include its adjustable output voltage capability, peak current sensing via external resistor (VIPK = 400 mV typ), MSOP-8 package thermal resistance (θJA = 130°C/W), and compatibility with electronic transformer-driven MR16 lamps.

Technical Context

The AL8811 operates as a constant-on-time controller in PFC-enabled MR16 drivers and functions as a current-mode PWM controller in buck/boost/inverting configurations. Its internal Darlington switch supports up to 1.6A peak current with VCE(sat) = 0.45–1.3V depending on drive configuration, and it uses an external CT capacitor to set oscillator frequency between 24–42 kHz (typ).

Feedback is implemented via an inverting-input comparator referenced to a 1.25V ±2% bandgap, enabling precise output regulation. Current limiting is achieved by monitoring voltage across an external sense resistor at Pin 7, with threshold VIPK = 400 mV (typ) at +25°C, varying ±20 mV over –40°C to +105°C.

Key Specifications

Pinout & Package

AL8811M8-13 is housed in an MSOP-8 package (3.0 × 4.9 mm, 0.65 mm pitch), optimized for thermal performance and compact LED driver layouts. The exposed pad is not electrically connected per datasheet; no thermal pad tie-down required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2577-ADJ and TPS61040DRVR, AL8811M8-13 uniquely combines triple-topology support, 1.6 A integrated switch, and electronic transformer compatibility - making it the only option among the three validated for triac-dimmable MR16 retrofit designs requiring PFC.

Availability

AL8811M8-13 is available at Aetrix Electronics and suitable for MR16 LED retrofit lamps, industrial 12–24V DC-DC conversion, and low-voltage LED string drivers requiring stable component supply across production lifecycles.

Supply support for AL8811M8-13 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, with emphasis on power management, signal integrity, and protection devices.

The AL8811 belongs to Diodes' DC-DC controller product line, engineered specifically for cost-sensitive, high-reliability LED lighting and industrial power conversion where topology flexibility and transformer compatibility are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The AL8811M8-13 has a maximum junction temperature (T_MJ) of +150°C per absolute maximum ratings. For reliable continuous operation, Diodes recommends limiting T_J to ≤ +125°C using the θ_JA = 130°C/W rating and appropriate PCB copper area. Derating begins at +105°C ambient per recommended operating conditions.

Can AL8811M8-13 drive an external MOSFET in synchronous rectification mode?

No - Pin 8 (Current Drive) is an open-collector NPN output designed to drive the gate of an external N-channel MOSFET in quasi-resonant or constant-on-time PFC stages, but it lacks the complementary drive, dead-time control, or bootstrap circuitry required for true synchronous rectification in buck/boost topologies.

Is the 2% reference voltage specified over temperature and line?

Yes - the 1.25 V reference has ±2% tolerance over full operating temperature (–40°C to +105°C) and supply voltage (3–20 V), with typical drift of ±1.4 mV over line and ±0.025 V over temperature, as confirmed in Electrical Characteristics Table (Reg(LINE) and Figure 2).

Does AL8811M8-13 support soft-start or current limiting during startup?

It implements inherent current limiting via Pin 7 (Current Sense) with 400 mV threshold, but lacks dedicated soft-start circuitry. Startup inrush is controlled by the CT capacitor time constant and external inductor saturation characteristics - external RC networks on Feedback or CT pins can be added for controlled ramp-up.