Diodes Incorporated AP2112M-3.3TRG1

Overview

AP2112M-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality. It delivers ±1.5% output accuracy, 250mV typical dropout at full load, and operates across –40°C to +85°C in SO-8 package. Used for stable local regulation in portable computing and display power rails.

For engineers reviewing the AP2112M-3.3TRG1 datasheet, AP2112M-3.3TRG1 pinout, AP2112M-3.3TRG1 application, or AP2112M-3.3TRG1 equivalent, key selection criteria include guaranteed 600mA output current, 55µA quiescent current, 60Ω VOUT discharge resistance on disable, PSRR of –65dB at 1kHz, and compatibility with 1.0µF ceramic, tantalum, or aluminum electrolytic output capacitors.

Technical Context

The AP2112M-3.3TRG1 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a CMOS process to achieve low dropout and fast transient response. Its enable input controls internal logic that gates the pass device and activates the 60Ω discharge path to ground when disabled.

Thermal shutdown triggers at +160°C with +25°C hysteresis, and foldback current limiting limits short-circuit current to 50mA. The regulator remains stable with 1.0µF output capacitance across ceramic, tantalum, and aluminum electrolytic types-no minimum ESR requirement.

Key Specifications

Pinout & Package

AP2112M-3.3TRG1 is housed in an SO-8 package (JEDEC MS-012AC) with exposed thermal pad (pin 7), offering 114°C/W junction-to-ambient thermal resistance without heatsink.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-3302E/MB and XC6206P332MR-G, AP2112M-3.3TRG1 uniquely balances 600mA drive capability, integrated enable/discharge, and industrial temperature range in SO-8-making it optimal for mid-power portable systems requiring robust sequencing and thermal resilience.

Availability

AP2112M-3.3TRG1 is available at Aetrix Electronics and suitable for laptop computer power management, LCD monitor logic rails, and portable DVD player subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP2112M-3.3TRG1 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 protection solutions for industrial, computing, and consumer markets.

The AP2112 product line delivers high-current, low-noise LDOs optimized for portable electronics requiring precise voltage regulation, fast transient response, and integrated enable/discharge control in multiple package options.

FAQ

What is the minimum input voltage required for AP2112M-3.3TRG1 to maintain regulation?

The AP2112M-3.3TRG1 requires VIN ≥ 3.55V to sustain 3.3V output at 600mA load, based on its 250mV typical dropout voltage. At lighter loads (e.g., 10mA), dropout drops to 5mV, allowing operation down to 3.305V input. Input must remain ≥2.5V per absolute maximum ratings, but regulation is not guaranteed below 3.305V under full load.

Can AP2112M-3.3TRG1 be used with a 10µF aluminum electrolytic output capacitor?

Yes - the AP2112M-3.3TRG1 is explicitly characterized for stability with 1.0µF to 10µF aluminum electrolytic, tantalum, and ceramic capacitors. No minimum ESR is required, and phase margin remains sufficient across all three dielectric types per datasheet testing. Larger values improve transient response but do not affect stability.

How does the auto-discharge function behave during enable transitions?

When EN falls below 0.4V, the internal 60Ω resistor connects VOUT to GND within 20µs (typical start-up time applies inversely). During re-enable, the regulator powers up normally with 20µs typical rise time; discharge ceases immediately upon EN rising above 1.5V, and VOUT ramps under load without overshoot due to internal soft-start.

Is the SO-8 package of AP2112M-3.3TRG1 thermally enhanced?

Yes - the SO-8 package features an exposed thermal pad (pin 7) that must be soldered to a PCB copper pour for effective heat dissipation. With proper layout, θJA drops from 114°C/W (no heatsink) to ~50°C/W, enabling continuous 600mA operation at +85°C ambient. Pin 5 is also GND, providing dual ground paths for lower impedance and improved thermal conduction.