Diodes Incorporated AP2202K-2.6TRE1

Overview

AP2202K-2.6TRE1 from Diodes Incorporated is a 150mA ultra-low dropout (ULDO) linear regulator with fixed 2.6V output, ±1% accuracy, 165mV dropout at full load, 75dB PSRR at 100Hz, and 1µA shutdown current. It delivers low-noise power to RF front-end circuitry, LNA stages, and precision analog sensors in portable battery-powered systems.

For engineers reviewing the AP2202K-2.6TRE1 datasheet, AP2202K-2.6TRE1 pinout, AP2202K-2.6TRE1 application, or AP2202K-2.6TRE1 equivalent, this device supports critical low-noise, low-quiescent-current, and high-PSRR requirements in space-constrained RF and portable electronics designs where input-to-output headroom is minimal.

Technical Context

The AP2202K-2.6TRE1 uses a PMOS pass transistor architecture enabling ultra-low dropout voltage and reverse current protection without external diodes. Its bandgap reference and error amplifier deliver tight line/load regulation (<3 mV variation over 0.1–150mA load) and low temperature coefficient (120 µV/°C).

It integrates CMOS/TTL-compatible enable control, thermal shutdown, overcurrent limiting (320–550mA), and bypass-capacitor-based noise filtering via the dedicated BYP pin. The SOT-23-5 package provides θ_JA = 200°C/W and θ_JC = 63.4°C/W for thermally sensitive layouts.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with exposed thermal pad (pin 2 connected to GND); footprint compatible with JEDEC MO-178AB standard. Thermal resistance θ_JA = 200°C/W (no heatsink), θ_JC = 63.4°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1702T-2602E/MB and XC6209F262MR-G, the AP2202K-2.6TRE1 uniquely combines 165mV dropout, 75dB PSRR, and a dedicated BYP pin for sub-1µV noise optimization - making it the only choice for RF LNA biasing where phase noise floor and supply rejection are design-critical.

Availability

AP2202K-2.6TRE1 is available at Aetrix Electronics and suitable for RF front-end power, portable audio biasing, digital camera sensor regulation, and wearable health monitor AFE applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for AP2202K-2.6TRE1 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP2202 series belongs to Diodes' high-performance ULDO regulator product line, engineered specifically for noise-sensitive, battery-operated RF and portable electronics where ultra-low dropout, low IQ, and high PSRR are mandatory.

FAQ

What is the minimum input voltage required for AP2202K-2.6TRE1 to maintain regulation at 150mA load?

The minimum input voltage is 2.6V + 165mV = 2.765V under typical conditions. However, Diodes recommends VIN ≥ VOUT + 0.5V (≥3.1V) to ensure robust operation across temperature, process variation, and transient load steps. Absolute maximum dropout is 350mV at 150mA over full temperature range, so 2.95V is the absolute minimum for guaranteed regulation.

Can the BYP pin be left unconnected, or is a capacitor mandatory?

A 100pF capacitor from BYP to GND is mandatory for achieving the specified 75dB PSRR and 260nV/√Hz output noise. Leaving BYP open degrades high-frequency PSRR by up to 20dB and increases broadband noise, compromising RF system performance. The capacitor must be placed adjacent to the IC with minimal trace length.

Does AP2202K-2.6TRE1 require an input capacitor, and what value is recommended?

Yes - a minimum 1.0µF X5R/X7R ceramic capacitor is required at VIN to stabilize the control loop and suppress input supply impedance spikes. Diodes specifies CIN = 1.0µF in all electrical characteristics tables; using <0.47µF risks instability under fast load transients, especially with long input traces or shared rails.

How does the EN pin behave during power-up, and is an external pull-up needed?

The EN pin has no internal pull-up; it defaults to high-impedance. If left floating, the regulator may power up unpredictably due to noise coupling. Diodes recommends a 100kΩ pull-up to VIN or a dedicated enable controller. Logic thresholds are V_IL ≤ 0.4V (shutdown) and V_IH ≥ 2.0V (active), compatible with 1.8V and 3.3V GPIOs.