Diodes Incorporated AP2111MP-1.2TRG1

Overview

AP2111MP-1.2TRG1 from BCD Semiconductor is a fixed-output 1.2V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality. It delivers ±1.5% output accuracy, 250mV typical dropout at 600mA (for 3.3V version; 1.2V version dropout is 1000–1300mV per datasheet Table 7), and operates from 2.5V to 6.0V input across –40°C to +85°C ambient. It is used in portable DVD power rails where tight voltage tolerance and low quiescent current (55μA typ) are critical.

For engineers reviewing the AP2111MP-1.2TRG1 datasheet, AP2111MP-1.2TRG1 pinout, AP2111MP-1.2TRG1 application, or AP2111MP-1.2TRG1 equivalent, key selection factors include guaranteed 600mA load capability, enable logic thresholds (VIH ≥1.5V, VIL ≤0.4V), thermal shutdown at 160°C, stability with 1.0μF ceramic output capacitors, and PSRR of 65dB at 100Hz/1kHz.

Technical Context

The AP2111MP-1.2TRG1 implements a CMOS-based LDO architecture with internal voltage reference (0.8V nominal for adjustable variants; fixed 1.2V output derived therefrom), foldback short-circuit protection (50mA limit), and UVLO with shutdown logic. Its fast loop response enables excellent load transient performance under dynamic current steps.

It integrates an EN-controlled bias network that reduces standby current to 0.01μA and activates an internal 60Ω VOUT discharge path when EN is low. The regulator is stable with flexible 1.0μF output capacitance-compatible with ceramic, tantalum, and aluminum electrolytic types-eliminating need for ESR tuning.

Key Specifications

Pinout & Package

AP2111MP-1.2TRG1 uses the PSOP-8 package (exposed pad, 4.9mm × 6.0mm × 1.7mm), optimized for thermal dissipation in space-constrained portable applications. Pin numbering follows standard top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2112K-1.2TRG1, the AP2111MP-1.2TRG1 supports full 600mA with superior thermal performance in PSOP-8; versus MCP1700T-1202E/TT, it trades 49μA higher IQ for 350mA more output current and tighter ±1.5% regulation-critical for logic rail stability.

Availability

AP2111MP-1.2TRG1 is available at Aetrix Electronics and suitable for laptop computer power management, portable DVD player subsystems, and industrial HMI display modules requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for AP2111MP-1.2TRG1 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 designer specializing in power management, LED drivers, and interface solutions for consumer, industrial, and computing markets.

The AP2111 product line delivers high-current, low-noise CMOS LDOs targeting portable electronics with stringent size, efficiency, and reliability demands-particularly where enable control and auto-discharge simplify system-level power sequencing.

FAQ

What is the minimum input voltage required for AP2111MP-1.2TRG1 to regulate at full 600mA?

The datasheet specifies a minimum input voltage of 2.5V for operation across the full temperature range. At 600mA load and 1.2V output, the dropout voltage is 1000–1300mV; thus, VIN must be ≥2.2V to maintain regulation-but 2.5V is the guaranteed minimum per Recommended Operating Conditions to ensure performance over –40°C to +85°C.

Does AP2111MP-1.2TRG1 require an external resistor divider for output voltage setting?

No. AP2111MP-1.2TRG1 is a fixed-output variant with internal feedback network set to 1.2V. Unlike the ADJ version (AP2111K-ADJ), it has no ADJ pin and does not use external resistors-pin 8 is NC, and output voltage is trimmed at wafer test.

Can AP2111MP-1.2TRG1 be used with aluminum electrolytic output capacitors?

Yes. The datasheet explicitly states stability with 1.0μF aluminum electrolytic, ceramic, and tantalum capacitors. No minimum ESR requirement applies, making it compatible with low-ESR polymer and traditional wet aluminum types without oscillation risk.

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

When EN is pulled low, the internal 60Ω discharge path connects VOUT to GND, discharging a 1.0μF output capacitor from 1.2V to <100mV in approximately 60μs. When EN is raised high, startup time is 20μs (no load), and the discharge path disconnects immediately-no delay or leakage remains.