Diodes Incorporated PT7M8218B11TAEX

Overview

PT7M8218B11TAEX from Pericom Semiconductor is a 300mA, high-PSRR low-dropout linear regulator with 2.85V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA, and 75dB PSRR at 1kHz-designed for power-sensitive portable RF and digital baseband circuits in mobile handsets.

For engineers reviewing the PT7M8218B11TAEX datasheet, PT7M8218B11TAEX pinout, PT7M8218B11TAEX application, or PT7M8218B11TAEX equivalent, key selection criteria include guaranteed 300mA load capability with 0.47µF ceramic output capacitance, auto-discharge functionality, thermal shutdown at 170°C, and EN pin compatibility with 1.2V logic-high threshold.

Technical Context

The PT7M8218B11TAEX uses a P-channel MOSFET pass element controlled by an internal error amplifier and reference voltage source, enabling stable regulation across 1.7V–5.5V input range while maintaining low quiescent current (36µA typical). Its internal phase compensation ensures stability with 0.47µF X5R/X7R ceramic capacitors on both input and output.

Functional protection includes current limiting (400mA typ), short-circuit current limiting (40mA), and thermal shutdown with 20°C hysteresis. The EN pin provides high-active control with sub-1µA standby current and 50Ω output discharge resistance when disabled.

Key Specifications

Pinout & Package

PT7M8218B11TAEX is packaged in lead-free, green-compliant SOT23-5L (JEDEC MO-178C/AA) with 0.95mm pitch, 3.02mm × 1.70mm footprint, and 1.25mm height-optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B282MR-G and RT9193-28GB, PT7M8218B11TAEX uniquely combines 150mV dropout, 75dB PSRR, EN-controlled auto-discharge, and ±2% accuracy in a single SOT23-5L package-making it optimal for sequenced, noise-sensitive portable RF power domains.

Availability

PT7M8218B11TAEX is available at Aetrix Electronics and suitable for mobile handset baseband power, GSM transceiver bias, digital camera sensor rails, and portable audio codec supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M8218B11TAEX 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

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-performance interface, timing, and power management ICs for communications, computing, and consumer electronics before its 2016 acquisition.

The PT7M8218 belongs to Pericom's precision LDO family targeting ultra-low-noise, high-PSRR power delivery in space- and battery-constrained portable devices-specifically engineered for RF and mixed-signal subsystems in 2G/3G mobile platforms.

FAQ

What is the minimum input voltage required for stable 2.85V output at 300mA?

The PT7M8218B11TAEX requires VIN ≥ VOUT + VDROPOUT = 2.85V + 150mV = 3.00V for full 300mA output. At 150mA, dropout is 150mV; at 300mA, typical dropout increases to ~180mV per datasheet load regulation curves-so 3.03V minimum input is recommended for guaranteed 300mA operation.

Can the NC pin (Pin 4) be left floating in production design?

Yes, Pin 4 is internally unconnected and may be left floating per datasheet guidance. However, tying it to GND improves mechanical robustness and reduces potential EMI coupling; it does not affect electrical performance but is preferred for high-reliability portable assemblies.

Does PT7M8218B11TAEX require an input capacitor, and if so, what value and type?

Yes-an input capacitor is required. A 0.47µF X5R or X7R ceramic capacitor placed within 2mm of VIN and GND pins is specified for stability and transient suppression. Larger values (e.g., 1–10µF) may improve low-frequency ripple rejection but are not necessary for basic operation.

How does the auto-discharge function behave during EN pin deactivation?

When EN is pulled low, the internal 50Ω discharge path connects VOUT to GND, discharging a 10µF output capacitor from 2.85V to <100mV in under 1ms. This prevents back-powering of upstream circuitry and ensures safe power-down sequencing in multi-rail systems.