Diodes Incorporated AP2114S-3.3G1

Overview

AP2114S-3.3G1 from BCD Semiconductor is a fixed 3.3V, 1A CMOS low-dropout linear regulator with enable control, designed for post-regulation in power management subsystems of consumer electronics. It delivers ±1.5% output accuracy, 450mV typical dropout at 1A, 30μVRMS output noise, and operates across –40°C to +85°C ambient temperature.

For engineers reviewing the AP2114S-3.3G1 datasheet, AP2114S-3.3G1 pinout, AP2114S-3.3G1 application, or AP2114S-3.3G1 equivalent, key selection criteria include dropout voltage under full load, PSRR at 1kHz, thermal resistance (θJC = 22°C/W), EN logic thresholds, and compatibility with 4.7μF ceramic output capacitors.

Technical Context

The AP2114S-3.3G1 uses a CMOS pass transistor architecture with internal bandgap reference and foldback current limiting. Its enable input supports active-high logic control (VIH ≥ 1.5V, VIL ≤ 0.4V), and it integrates thermal shutdown (160°C) with 25°C hysteresis.

Stability is guaranteed with 4.7μF ceramic, tantalum, or aluminum electrolytic output capacitors. Line regulation is 0.02%/V typical at 30mA, and load regulation is 0.2%/A typical from 1mA to 1A - both critical for maintaining rail integrity in dynamic load environments like LCD backlight drivers.

Key Specifications

Pinout & Package

AP2114S-3.3G1 is packaged in TO-263-3 (D²PAK), a surface-mount thermally enhanced package with exposed drain pad for PCB heat transfer. Pin 1 = GND, Pin 2 = VIN, Pin 3 = VOUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-3302E/MB and TLS850B2TE/V33, AP2114S-3.3G1 provides 4× higher output current (1A vs. 250mA/500mA), lower dropout (450mV vs. 600mV+), and consumer-optimized thermal resistance (22°C/W), making it preferable for high-density, cost-sensitive consumer power rails.

Availability

AP2114S-3.3G1 is available at Aetrix Electronics and suitable for LCD monitor power delivery, set-top box mainboard regulation, and digital media adapter subsystems requiring stable component supply, RoHS-compliant packaging, and consistent parametric performance across production lots.

Supply support for AP2114S-3.3G1 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-voltage analog and power management ICs, with design centers in Shanghai and Shenzhen and wafer fabrication partnerships in Asia.

The AP2114 product line targets cost-effective, high-reliability LDO regulation for mass-market consumer electronics, emphasizing low noise, wide input range, and robust thermal performance in standard surface-mount packages.

FAQ

What is the minimum input voltage required for AP2114S-3.3G1 to maintain regulation at 1A load?

The minimum input voltage is 3.75V: 3.3V output + 450mV typical dropout. The datasheet specifies recommended operating VIN ≥ 4.3V for full 1A performance across temperature, but regulation is maintained down to VIN = VOUT + VDROP(max) = 3.3V + 0.75V = 4.05V per electrical characteristics table.

Can AP2114S-3.3G1 operate with a 2.2μF ceramic output capacitor?

No - the device requires ≥4.7μF output capacitance for guaranteed stability per the datasheet. Using 2.2μF may cause oscillation or poor transient response. The 4.7μF value applies to ceramic, tantalum, or aluminum electrolytic types, with ESR ≤ 1Ω.

Is the EN pin internally pulled down, and what is its leakage current?

Yes - the EN pin has an internal 3.0MΩ pull-down resistor. Input leakage is ±100nA over temperature, enabling direct connection to open-drain GPIO without external resistors. Logic high threshold is 1.5V minimum; logic low is 0.4V maximum.

Does AP2114S-3.3G1 require a bypass capacitor on the ADJ pin?

No - the AP2114S-3.3G1 is a fixed-output variant (3.3V) and does not include an ADJ pin. Only adjustable versions (e.g., AP2114M-ADJG1) expose the ADJ terminal; this part uses internal resistor feedback and has no ADJ connection.