Diodes Incorporated AP2111HA-3.3TRG1

Overview

AP2111HA-3.3TRG1 from BCD Semiconductor is a fixed 3.3V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge function, designed for power rail regulation in space-constrained portable electronics. It delivers ±1.5% output accuracy, 250mV typical dropout at 600mA, 50μVRMS output noise, and operates across –40°C to +85°C ambient temperature.

For engineers reviewing the AP2111HA-3.3TRG1 datasheet, AP2111HA-3.3TRG1 pinout, AP2111HA-3.3TRG1 application, or AP2111HA-3.3TRG1 equivalent, key selection criteria include guaranteed 600mA load capability, fast transient response, low quiescent current (55μA), thermal shutdown protection, and compatibility with 1.0μF ceramic, tantalum, or aluminum electrolytic output capacitors.

Technical Context

The AP2111HA-3.3TRG1 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and pass transistor, enabling stable regulation under varying line and load conditions. Its loop design achieves excellent load regulation (0.2%/A) and line regulation (0.02%/V), supported by 65dB PSRR at both 100Hz and 1kHz.

It integrates UVLO, foldback short-circuit protection (50mA limit), thermal shutdown (160°C trip with 30°C hysteresis), and an EN-controlled auto-discharge path (60Ω discharge resistor). The SOT-223(HA) package provides θJC = 50.9°C/W and supports operation up to 6.0V input.

Key Specifications

Pinout & Package

The AP2111HA-3.3TRG1 is housed in a SOT-223(HA) surface-mount package with exposed thermal pad (pin 1 = VIN, pin 2 = VOUT, pin 3 = GND, pin 4 = EN), optimized for thermal performance in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and XC6206P332MR-G, the AP2111HA-3.3TRG1 uniquely combines 600mA drive, integrated enable with discharge, and full industrial temperature range - making it optimal for mid-power portable and embedded systems requiring active rail control.

Availability

AP2111HA-3.3TRG1 is available at Aetrix Electronics and suitable for laptop computer power management, portable DVD player subsystems, LCD monitor logic supplies, and industrial control panels requiring stable component supply with consistent parametric performance and RoHS-compliant green packaging.

Supply support for AP2111HA-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

BCD Semiconductor Manufacturing Limited is a China-based fabless analog IC supplier specializing in power management, LED drivers, and mixed-signal solutions for consumer, industrial, and computing markets.

The AP2111 product line delivers high-current, low-noise CMOS LDO regulators with enable and protection features, targeting portable electronics and embedded systems needing reliable, cost-effective voltage regulation with minimal external components.

FAQ

What is the minimum input voltage required for AP2111HA-3.3TRG1 to maintain regulation?

The AP2111HA-3.3TRG1 requires VIN ≥ 4.3V to guarantee 3.3V output at full 600mA load, based on its 250mV typical dropout voltage. At lighter loads (e.g., 10mA), dropout drops to 5–8mV, allowing operation down to ~3.31V input while maintaining regulation.

Does AP2111HA-3.3TRG1 require an external resistor divider for output voltage setting?

No. The AP2111HA-3.3TRG1 is a fixed-output variant; its 3.3V regulation is internally trimmed and does not use the ADJ pin. The ADJ/NC pin (Pin 5 in SOIC-8/PSOP-8) is left unconnected in this version and has no functional role.

Can AP2111HA-3.3TRG1 operate with a 10μF aluminum electrolytic output capacitor?

Yes. The datasheet explicitly states stability with 1.0μF flexible capacitors including aluminum electrolytic types. A 10μF aluminum cap exceeds the minimum requirement and improves low-frequency ripple suppression, though ESR should remain within 100mΩ–1Ω per typical LDO guidelines.

How does the auto-discharge function behave during EN pin assertion?

When EN is driven LOW, the internal 60Ω discharge path connects VOUT to GND, actively pulling the output voltage to near-zero within milliseconds. This prevents residual charge from interfering with downstream logic reset sequences or causing unintended wake events in battery-powered systems.