Diodes Incorporated PT7M8218B09TAEX

Overview

PT7M8218B09TAEX from Pericom Semiconductor is a 300mA, high-PSRR low-dropout regulator with 0.9V fixed output, 150mV dropout at 150mA (V_OUT=2.8V), ±2% initial accuracy, and stable operation with 0.47µF ceramic capacitors. It serves as a precision power supply for noise-sensitive analog and RF circuitry in portable wireless devices.

For engineers reviewing the PT7M8218B09TAEX datasheet, PT7M8218B09TAEX pinout, PT7M8218B09TAEX application, or PT7M8218B09TAEX equivalent, key selection criteria include guaranteed 300mA load capability, 75dB PSRR at 1kHz, auto output discharge, thermal shutdown protection, and SC70-5L/SOT23-5L package compatibility for space-constrained designs.

Technical Context

The PT7M8218B09TAEX integrates a P-channel MOSFET pass element, internal reference voltage source, error amplifier with phase compensation, and EN-controlled on/off logic. Its architecture enables stable regulation with ultra-low ESR ceramic capacitors without external compensation.

It delivers regulated 0.9V output across 1.7–5.5V input range, supports active-high enable control, includes current-limit (400mA typ.) and thermal shutdown (170°C) protections, and maintains ±100ppm/°C output voltage drift over –40°C to +85°C ambient.

Key Specifications

Pinout & Package

PT7M8218B09TAEX is available in both SC70-5L and SOT23-5L packages - compact, surface-mount, lead-free, green-compliant outlines with identical pin assignment and thermal performance up to 400mW (SOT23) / 300mW (SC70).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P092MR and RP114K091D, PT7M8218B09TAEX uniquely combines EN control, auto-discharge, 75dB PSRR, and 150mV dropout - making it optimal for sequenced, noise-sensitive, and battery-constrained portable RF systems.

Availability

PT7M8218B09TAEX is available at Aetrix Electronics and suitable for mobile baseband power, RF front-end bias, digital still camera core, and portable audio codec supply requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for PT7M8218B09TAEX 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 and computing markets before its 2017 acquisition.

The PT7M8218 series was designed specifically for portable wireless devices requiring ultra-small footprint, low-noise, and high-PSRR LDOs with factory-trimmed voltages from 0.9V to 3.3V in 100mV steps.

FAQ

What is the minimum input voltage required to maintain regulation at 0.9V output?

The PT7M8218B09TAEX requires VIN ≥ VOUT + VDROPOUT. With 150mV typical dropout at 150mA, the minimum functional input is 1.05V. However, datasheet specifies 1.7V minimum operating voltage to guarantee full 300mA output and all specifications across temperature and process variation.

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, but Pericom recommends connecting it to GND to improve mechanical reliability during reflow and reduce potential EMI coupling through the unused pad - no electrical penalty results from grounding it.

Does PT7M8218B09TAEX require an input capacitor?

Yes - a 0.47µF X5R/X7R ceramic capacitor is required between VIN and GND, placed as close as possible to Pins 1 and 2. This stabilizes the internal control loop, improves line transient response, and prevents oscillation under varying input impedance conditions.

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, discharging the output capacitor within tens of microseconds. This prevents residual voltage from interfering with downstream power sequencing or causing latch-up in connected logic devices.