Diodes Incorporated AP2202K-ADJTRG1

Overview

AP2202K-ADJTRG1 from Diodes Incorporated is an adjustable 150mA ultra-low dropout (ULDO) linear regulator with 165mV typical dropout at full load, ±1% output voltage accuracy, and 75dB PSRR at 100Hz-designed for noise-sensitive RF power rails in battery-powered handheld devices.

For engineers reviewing the AP2202K-ADJTRG1 datasheet, AP2202K-ADJTRG1 pinout, AP2202K-ADJTRG1 application, or AP2202K-ADJTRG1 equivalent, key selection criteria include adjustable output (1.25V to 13.2V via external resistors), 1µA shutdown current, reverse current protection, thermal/overcurrent safeguards, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The AP2202K-ADJTRG1 implements a bandgap-referenced error amplifier driving a PMOS pass transistor, enabling ultra-low dropout operation without requiring a minimum load. Its BYP/ADJ pin accepts an external resistor divider to set output voltage per V_OUT = 1.25V × (1 + R₂/R₁), with 2.3V minimum recommended output.

Internal protection includes thermal shutdown triggered at +150°C junction temperature, cycle-by-cycle current limiting (320–550mA), and reverse current blocking when V_IN < V_OUT. The enable input supports CMOS/TTL logic levels (0.4V low, 2.0V high) and draws ≤25µA in active mode.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with exposed pad (no thermal tab connection required); 1.3mm × 2.9mm footprint, 1.45mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826T-ADJ/DC and TLS850B2TE/V33, the AP2202K-ADJTRG1 uniquely combines adjustable output, reverse current protection, and sub-200mV dropout in a RoHS-compliant SOT-23-5 package-making it optimal for space-constrained, battery-sensitive RF designs where output flexibility and leakage control are critical.

Availability

AP2202K-ADJTRG1 is available at Aetrix Electronics and suitable for cellular handset power management, wireless IoT sensor nodes, digital still camera image sensor biasing, and industrial handheld terminal logic regulation requiring stable component supply across production volumes.

Supply support for AP2202K-ADJTRG1 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 company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP2202 product line delivers ultra-low-noise, ultra-low-dropout regulators optimized for battery-powered RF and portable electronics-prioritizing PSRR, dropout, and standby current over raw efficiency.

FAQ

What is the minimum output voltage achievable with AP2202K-ADJTRG1?

The AP2202K-ADJTRG1 supports output voltages down to 2.3V when configured with external resistors, as specified in the datasheet's "Typical Applications Circuit" section. This limit ensures stable regulation and avoids internal reference errors below the bandgap-derived 1.25V feedback threshold.

Does AP2202K-ADJTRG1 require an external bypass capacitor on the BYP/ADJ pin?

Yes-a 100pF capacitor between BYP/ADJ and GND is mandatory for optimal noise performance, as confirmed in the "Typical Applications Circuit" and electrical characteristics tables. Omitting it increases output noise by up to 3× and degrades PSRR above 10kHz.

Can AP2202K-ADJTRG1 operate with input voltage lower than the desired output voltage?

No-the device requires VIN ≥ VOUT + dropout voltage (≥VOUT + 0.165V min). Operation below this threshold causes unregulated output collapse. The datasheet explicitly states VOUT+0.5V as the recommended minimum input to ensure margin against line/load transients.

Is thermal derating required for continuous 150mA operation in SOT-23-5?

Yes-using the θ_JA = 200°C/W value and maximum T_J = +150°C, ambient temperature must remain ≤+75°C at 150mA with standard PCB layout. Adding 100mm² of 1oz copper under the exposed pad reduces θ_JA to ~120°C/W, enabling full-load operation up to +95°C ambient.