Diodes Incorporated AP2111H-1.2TRG1

Overview

AP2111H-1.2TRG1 from BCD Semiconductor Manufacturing Limited is a fixed-output 1.2V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality, designed for power rail regulation in space-constrained portable electronics. 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 across –40°C to +85°C ambient temperature.

For engineers reviewing the AP2111H-1.2TRG1 datasheet, AP2111H-1.2TRG1 pinout, AP2111H-1.2TRG1 application, or AP2111H-1.2TRG1 equivalent, key selection criteria include guaranteed 600mA load capability, ultra-low standby current (0.01μA), fast start-up time (20μs), thermal shutdown protection (160°C), and compatibility with 1.0μF ceramic, tantalum, or aluminum electrolytic output capacitors.

Technical Context

The AP2111H-1.2TRG1 implements a CMOS-based LDO architecture with integrated UVLO, foldback short-circuit protection (50mA limit), and thermal shutdown with 30°C hysteresis. Its internal reference voltage is trimmed to ±1.5% accuracy, enabling stable 1.2V output under varying line (0.02%/V) and load (0.2%/A) conditions.

Enable logic (VIH ≥1.5V, VIL ≤0.4V) controls regulator state with 3.0mΩ internal pull-down resistor and 60Ω VOUT discharge path during shutdown. PSRR remains at 65dB at both 100Hz and 1kHz, supporting noise-sensitive analog and mixed-signal loads.

Key Specifications

Pinout & Package

AP2111H-1.2TRG1 is packaged in SOT-223 (H variant), a thermally enhanced 4-pin surface-mount package with exposed thermal pad. Pin 1 = GND, Pin 2 = VOUT, Pin 3 = GND (thermal tab), Pin 4 = VIN. EN and ADJ/NC are not present on this fixed-output SOT-223 configuration - only VIN, VOUT, and dual GND terminals are used.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1202E/TT and XC6206P122MR-G, AP2111H-1.2TRG1 uniquely balances 600mA delivery, 0.01μA shutdown, and integrated discharge - making it optimal for portable systems requiring robust, controllable, medium-current regulation.

Availability

AP2111H-1.2TRG1 is available at Aetrix Electronics and suitable for laptop computer power management, portable DVD player subsystems, LCD monitor logic rails, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP2111H-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 semiconductor company specializing in high-performance analog and power management ICs, including LDOs, DC/DC converters, and LED drivers.

The AP2111 product line targets cost-effective, thermally robust LDO solutions for portable and industrial equipment, emphasizing wide input range, low quiescent current, and capacitor flexibility without external compensation.

FAQ

What is the minimum input voltage required for AP2111H-1.2TRG1 to regulate 1.2V at 600mA?

The datasheet specifies a minimum input voltage of 2.5V for full 600mA operation at 1.2V output. Dropout is 1000–1300mV at 600mA, so VIN must be ≥2.5V to maintain regulation. Below 2.5V, output drops linearly with input, and current capability decreases.

Does AP2111H-1.2TRG1 require an external enable pull-up resistor?

No. The device includes a 3.0mΩ internal pull-down resistor on the EN pin (not present on SOT-223 H-package). Since AP2111H-1.2TRG1 uses the fixed-output SOT-223 variant without EN pin, enable functionality is not implemented - the regulator operates continuously when powered within its input range.

Can AP2111H-1.2TRG1 be used with a 10μF aluminum electrolytic output capacitor?

Yes. The datasheet explicitly states stability with 1.0μF flexible capacitors - including aluminum electrolytic types - and larger values (e.g., 10μF) improve load transient response without compromising stability, provided ESR remains within 10–100mΩ range.

Is the 1.2V output voltage trimmed at wafer or package level?

The ±1.5% output accuracy is achieved through post-package voltage trimming, as confirmed by the "VOUT ×98.5% / 1.2V / VOUT ×101.5%" specification in Table 7 and the production test methodology noted in datasheet footnotes (testing at TA=25°C, over-temperature specs guaranteed by design).