Diodes Incorporated PT7M8218B12CEX

Overview

PT7M8218B12CEX from Pericom Semiconductor is a 300mA, high-PSRR low-dropout regulator with 2.8V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA, and stable operation with 0.47µF ceramic output capacitors. It delivers regulated power to noise-sensitive RF and digital baseband circuits in portable wireless devices.

For engineers reviewing the PT7M8218B12CEX datasheet, PT7M8218B12CEX pinout, PT7M8218B12CEX application, or PT7M8218B12CEX equivalent, key selection criteria include PSRR (75dB @ 1kHz), quiescent current (36µA), thermal shutdown (170°C), EN pin control logic, and SC70-5L package compatibility with space-constrained PCB layouts.

Technical Context

The PT7M8218B12CEX integrates a P-channel MOSFET pass element, internal reference voltage source, error amplifier with phase compensation, and protection circuitry including current limit (400mA) and thermal shutdown (170°C). Its architecture enables stable regulation with low-ESR ceramic capacitors without external compensation.

It features high-accuracy factory-trimmed output (2.8V ±2%), auto output discharge via internal 50Ω resistor when disabled, and EN pin with 1.2V logic-high threshold. Operation spans -40°C to +85°C ambient with input range 1.7V–5.5V and guaranteed 300mA load capability.

Key Specifications

Pinout & Package

PT7M8218B12CEX is packaged in SC70-5L (JEDEC MO-203B/AA), a 1.2mm × 2.1mm surface-mount package with 0.65mm pitch, optimized for ultra-compact portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P282MR and RT9193-28GB, PT7M8218B12CEX uniquely combines 300mA drive, 75dB PSRR, EN-controlled auto-discharge, and SC70-5L footprint-making it optimal for space-constrained, noise-sensitive RF and baseband subsystems.

Availability

PT7M8218B12CEX is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable audio devices requiring stable component supply with lead-free, green-compliant packaging.

Supply support for PT7M8218B12CEX 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 consumer electronics.

The PT7M8218 series was designed for ultra-low-noise, high-PSRR regulation in battery-powered portable devices-emphasizing small footprint, low I_Q, and robust transient response under dynamic load conditions.

FAQ

What is the minimum input voltage required for stable 2.8V output at full 300mA load?

The PT7M8218B12CEX requires VIN ≥ 2.95V (2.8V + 150mV dropout) to maintain regulation at 300mA. At 150mA, dropout is 150mV; worst-case dropout increases slightly at full load but remains ≤180mV per datasheet limits for VOUT ≥2.8V. Below 2.95V, output collapses linearly with input.

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

Yes, Pin 4 is internally unconnected and may float, but Pericom recommends tying it to GND to improve mechanical anchoring during reflow and reduce potential EMI coupling. No electrical function is affected either way, and no current flows into this terminal.

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

When EN is pulled low, an internal 50Ω resistor connects VOUT to GND, discharging a 0.47µF output capacitor from 2.8V to <100mV in under 1ms. This prevents back-powering of upstream circuits and ensures safe power-down sequencing in multi-rail systems.

Is the PT7M8218B12CEX compatible with 1µF ceramic output capacitors?

No-the device is characterized and guaranteed stable only with 0.47µF ±20% X5R/X7R ceramic capacitors. Larger values (e.g., 1µF) may cause phase margin degradation and oscillation due to altered loop dynamics; smaller values risk instability and poor transient response per design validation.