Diodes Incorporated AP2202K-2.5TRG1

Overview

AP2202K-2.5TRG1 from Diodes Incorporated is a 150mA ultra-low dropout (ULDO) linear regulator with fixed 2.5V output, ±1% accuracy, 165mV dropout at full load, 75dB PSRR at 100Hz, and 1µA shutdown current. It delivers low-noise power to RF circuitry and battery-powered portable devices requiring stable voltage under tight input headroom constraints.

For engineers reviewing the AP2202K-2.5TRG1 datasheet, AP2202K-2.5TRG1 pinout, AP2202K-2.5TRG1 application, or AP2202K-2.5TRG1 equivalent, this device is selected for noise-sensitive analog/RF rails, compact handheld power domains, and systems demanding high PSRR with minimal quiescent current in shutdown mode.

Technical Context

The AP2202K-2.5TRG1 integrates a bandgap reference, error amplifier, and PMOS pass transistor in a fully integrated ULDO architecture. Its CMOS/TTL-compatible enable input supports logic-level control of regulation state, while internal thermal shutdown and overcurrent protection ensure robust operation across load and temperature extremes.

Designed for low-noise applications, it uses a dedicated BYP pin for external 100pF capacitor to reduce output noise to 260nV/√Hz. The SOT-23-5 package provides thermal resistance of 63.4°C/W (junction-to-case), enabling reliable 150mA operation without heatsinking in ambient temperatures up to +125°C.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with exposed thermal pad on underside (pin 2 is GND and thermal tab); footprint compatible with standard pick-and-place assembly and reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ULDO regulator applications.

Compared with MCP1700T-2502E/TT and XC6206P252MR-G, the AP2202K-2.5TRG1 uniquely combines 75dB PSRR, 165mV dropout, 1µA shutdown, and BYP-pin noise filtering - making it the only option among the three that meets stringent RF bias and battery-life requirements simultaneously.

Availability

AP2202K-2.5TRG1 is available at Aetrix Electronics and suitable for cellular handset RF power management, digital camera image sensor biasing, wireless communicator baseband I/O regulation, and PDA audio codec reference supply requiring stable component supply across production lifecycles.

Supply support for AP2202K-2.5TRG1 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP2202 series belongs to Diodes' RF-optimized ULDO regulator product line, engineered specifically for noise-sensitive wireless and portable electronics where PSRR, dropout, and standby current are critical system-level constraints.

FAQ

What is the minimum input voltage required for stable 2.5V output from AP2202K-2.5TRG1?

The datasheet specifies a recommended minimum input voltage of V_OUT + 0.5V = 3.0V to ensure adequate headroom across temperature and load. At 150mA and +25°C, dropout is 165mV, so 2.665V input would theoretically sustain regulation-but 3.0V is the design-minimum to accommodate worst-case variation, thermal effects, and line/load regulation margins.

Can the BYP pin be left unconnected if low-noise operation is not required?

No-leaving the BYP pin floating violates the functional block diagram and can cause instability or increased output noise. The datasheet mandates a 100pF capacitor between BYP and GND for proper internal reference filtering. Omitting it degrades PSRR and increases output noise beyond specified 260nV/√Hz.

Does AP2202K-2.5TRG1 support reverse current protection during input undervoltage events?

Yes-the device includes integrated reverse current protection. When VIN drops below VOUT (e.g., during battery swap or input disconnection), the internal pass element blocks reverse current flow from VOUT to VIN, preventing discharge of downstream capacitors and protecting upstream sources.

Is the SOT-23-5 package of AP2202K-2.5TRG1 RoHS-compliant and halogen-free?

Yes-AP2202K-2.5TRG1 is supplied in a fully RoHS-compliant, lead-free SOT-23-5 package meeting EU Directive 2015/863/EU (RoHS 3). It is also halogen- and antimony-free ("Green" per Diodes' definition), containing <900ppm bromine, <900ppm chlorine, and <1000ppm antimony compounds.