Diodes Incorporated PT7M8218B25TAE

Overview

PT7M8218B25TAE from Pericom Semiconductor is a 300mA, high-PSRR low-dropout linear regulator with 2.5V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA (V_OUT=2.8V), and 75dB PSRR at 1kHz. It operates from 1.7V to 5.5V input, supports 0.47µF ceramic output capacitors, and integrates thermal shutdown, current limit, and auto output discharge - deployed in mobile phone baseband power rails.

For engineers reviewing the PT7M8218B25TAE datasheet, PT7M8218B25TAE pinout, PT7M8218B25TAE application, or PT7M8218B25TAE equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions, ultra-low 36µA quiescent current for battery longevity, EN-controlled sequencing, and SC70-5L/SOT23-5L package compatibility with space-constrained portable PCB layouts.

Technical Context

The PT7M8218B25TAE uses a P-channel MOSFET pass element controlled by an internal error amplifier comparing feedback against a precision bandgap reference. Its integrated phase compensator enables stability with only 0.47µF X5R/X7R ceramic output capacitance, eliminating need for external compensation networks.

Enable logic is high-active (EN ≥1.2V), with sub-1µA standby current when disabled. Protection circuitry includes foldback current limiting (400mA typical trip) and thermal shutdown at 170°C with 20°C hysteresis, ensuring safe operation during sustained overload or ambient temperature excursions.

Key Specifications

Pinout & Package

PT7M8218B25TAE is available in SOT23-5L (JEDEC MO-178C/AA) and SC70-5L (JEDEC MO-203B/AA) packages - both 5-pin surface-mount outlines with identical pin assignment and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P252MR and RT9193-25GB, PT7M8218B25TAE delivers superior PSRR (75dB vs. ≤65dB), tighter output accuracy (±2% vs. ±3%), and integrated EN/discharge for robust system-level power management - critical for modern portable devices requiring multi-rail sequencing and extended battery life.

Availability

PT7M8218B25TAE is available at Aetrix Electronics and suitable for mobile phones, digital cameras, portable audio devices, and Bluetooth peripherals requiring stable component supply with lead-free, RoHS-compliant packaging.

Supply support for PT7M8218B25TAE 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 analog and mixed-signal ICs for communications, computing, and consumer electronics before its 2016 acquisition.

The PT7M8218 belongs to Pericom's precision LDO regulator product line, designed specifically for battery-powered portable devices demanding low IQ, high PSRR, and small-footprint packaging without compromising regulation accuracy or protection robustness.

FAQ

What is the minimum input voltage required to maintain 2.5V output at full 300mA load?

The PT7M8218B25TAE requires VIN ≥ 2.65V to sustain 2.5V output at 300mA, based on its maximum dropout voltage of 150mV at 150mA and confirmed load regulation curve showing <10mV droop up to 300mA. At 300mA, measured dropout increases to ~180mV per typical performance data, setting absolute minimum VIN at 2.68V.

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

Yes, Pin 4 is internally unconnected and may be left floating per datasheet guidance; however, tying it to GND is recommended to reduce potential EMI coupling and improve layout symmetry - especially in high-density RF sections where parasitic antenna effects must be minimized.

Does PT7M8218B25TAE require an input capacitor, and if so, what value and type?

While not strictly mandatory for stability, a 0.47µF X5R or X7R ceramic capacitor is strongly recommended at VIN to suppress high-frequency noise and prevent instability due to PCB trace inductance. The datasheet specifies this value for all transient response and PSRR test conditions, and omitting it risks degraded noise rejection and potential oscillation under dynamic loads.

How does the auto output discharge function behave during EN deactivation?

When EN is pulled low, the internal 50Ω discharge path between VOUT and GND activates immediately, discharging a 0.47µF output capacitor from 2.5V to <0.1V in approximately 12ms. This prevents residual voltage from interfering with downstream logic states or causing latch-up in powered-off subsystems during hot-swap or reset sequences.