Diodes Incorporated AP2111H-4.8TRG1

Overview

AP2111H-4.8TRG1 from BCD Semiconductor Manufacturing Limited is a fixed-output 4.8V CMOS low-dropout linear regulator delivering guaranteed 600mA continuous load current, ±1.5% output voltage accuracy, and 200mV typical dropout at 600mA. It features enable control, thermal shutdown, foldback short-circuit protection (50mA), and stable operation with 1.0μF ceramic, tantalum, or aluminum electrolytic output capacitors. Used in portable LCD monitors requiring precise, low-noise 4.8V bias for display logic and backlight drivers.

For engineers reviewing the AP2111H-4.8TRG1 datasheet, AP2111H-4.8TRG1 pinout, AP2111H-4.8TRG1 application, or AP2111H-4.8TRG1 equivalent, key selection criteria include dropout voltage at full load, PSRR at 100Hz/1kHz, standby current, thermal shutdown threshold, and SOT-223 package thermal resistance (θJC = 50.9°C/W).

Technical Context

The AP2111H-4.8TRG1 implements a CMOS-based LDO architecture with internal voltage reference (0.8V nominal), error amplifier, and PMOS pass transistor. Its fast loop response enables excellent load transient performance-critical for powering digital logic blocks experiencing dynamic current steps.

Enable logic (VIH ≥ 1.5V, VIL ≤ 0.4V) controls UVLO and shutdown sequencing, while built-in auto-discharge via 60Ω internal resistor ensures rapid VOUT decay when disabled. Thermal shutdown activates at 160°C with 30°C hysteresis, and foldback current limiting reduces power dissipation during sustained short-circuit events.

Key Specifications

Pinout & Package

SOT-223 (H package) thermally enhanced 3-pin surface-mount package with exposed thermal pad (pin 2 = VOUT, pin 3 = GND, pin 1 = VIN, pin 4 = EN); θJA = 128°C/W, θJC = 50.9°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2112H-4.8TRG1, the AP2111H-4.8TRG1 trades 5dB PSRR and 20μA quiescent current for broader legacy design adoption and identical thermal behavior in SOT-223. Against MCP1700T-4802E/TT, it delivers 2.4× higher current, 2.5× lower dropout, and integrated discharge-making it the sole viable choice for 4.8V/600mA system rails.

Availability

AP2111H-4.8TRG1 is available at Aetrix Electronics and suitable for LCD monitor power rails, portable DVD system bias, laptop display interfaces, and industrial HMI panels requiring stable component supply with RoHS-compliant green packaging (G1 suffix).

Supply support for AP2111H-4.8TRG1 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 for consumer, computing, and industrial markets.

The AP2111 product line delivers cost-optimized, high-current CMOS LDOs targeting portable and display applications where accuracy, low dropout, and fast transient response are essential.

FAQ

What is the minimum input voltage required for AP2111H-4.8TRG1 to maintain regulation at 600mA?

The datasheet specifies a maximum dropout voltage of 400mV at 600mA for the 4.8V version. Therefore, VIN must be ≥ 5.2V to guarantee regulation across temperature and process variation. At typical 200mV dropout, 5.0V input suffices-but 5.2V is the design-minimum for worst-case margin.

Can AP2111H-4.8TRG1 operate with a 10μF aluminum electrolytic output capacitor?

Yes-the datasheet explicitly states stability with aluminum electrolytic, tantalum, and ceramic capacitors ≥1.0μF. A 10μF aluminum cap (ESR ~100mΩ) meets the stability criteria and improves low-frequency ripple suppression, though ceramic remains preferred for transient response.

Does the EN pin require an external pull-up resistor?

No-AP2111H-4.8TRG1 has an internal EN pull-down resistor of 3.0MΩ. An external pull-up is unnecessary unless system-level sequencing demands controlled rise time or noise immunity; in most cases, direct MCU GPIO drive suffices.

Is thermal derating required for continuous 600mA operation in still air?

Yes-using θJA = 128°C/W and maximum ambient of 85°C, power dissipation at 600mA with 200mV dropout is 120mW. Junction temperature rise is 120mW × 128°C/W = 15.4°C, yielding TJ ≈ 100.4°C-within the 150°C absolute max but below the 160°C thermal shutdown threshold. No derating needed for this condition.