Diodes Incorporated PT7M8216B28XZE

Overview

PT7M8216B28XZE from Pericom Semiconductor is a 2.8V fixed-output, 300mA low-dropout linear regulator featuring 150mV dropout at 150mA, ±2% initial output accuracy, 75dB PSRR at 1kHz, and ultra-low 36µA quiescent current. It operates from 1.7V to 5.5V input, supports 0.47µF ceramic output capacitors, and integrates thermal shutdown, current limiting, and auto output discharge - optimized for space-constrained portable power rails in mobile RF sections.

For engineers reviewing the PT7M8216B28XZE datasheet, PT7M8216B28XZE pinout, PT7M8216B28XZE application, or PT7M8216B28XZE equivalent, key selection criteria include guaranteed 300mA load capability under 150mV dropout, high PSRR for noise-sensitive analog/RF supply domains, UDFN-4L 1mm×1mm footprint compatibility, and EN-controlled sequencing in battery-powered systems.

Technical Context

The PT7M8216B28XZE employs a P-channel MOSFET pass element with internal phase compensation, enabling stable regulation using only 0.47µF X5R/X7R ceramic capacitors on both input and output. Its error amplifier compares a trimmed bandgap reference against the feedback network (factory-set for 2.8V output) to drive the pass device with minimal phase lag.

EN pin logic is high-active (VENH ≥1.2V), enabling precise power sequencing; when disabled, the IC activates an internal 50Ω discharge path to VOUT, ensuring rapid output voltage decay. Protection circuitry includes foldback current limiting (400mA typical trip) and thermal shutdown at 170°C with 20°C hysteresis.

Key Specifications

Pinout & Package

PT7M8216B28XZE is packaged in Pb-free, green-compliant UDFN-4L (1mm × 1mm, 0.4mm height) with wettable flank leads for automated optical inspection. Pin 1 is marked by a dot; top view orientation follows standard UDFN numbering (1–4 counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B282MR-G and RT9013-28GB, PT7M8216B28XZE uniquely combines ultra-low dropout (150mV), industry-leading PSRR (75dB), auto-discharge, and sub-40µA quiescent current in a 1mm² UDFN - making it optimal for battery-sensitive, noise-critical, and space-constrained RF and imaging subsystems.

Availability

PT7M8216B28XZE is available at Aetrix Electronics and suitable for mobile phone baseband power, GSM/CDMA RF front-end biasing, and digital camera sensor core regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M8216B28XZE 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 2016 acquisition.

PT7M8216 belongs to Pericom's precision LDO family designed specifically for ultra-low-noise, high-PSRR local regulation in portable wireless devices - emphasizing miniature packaging, battery efficiency, and RF-friendly noise performance.

FAQ

What is the recommended output capacitor for PT7M8216B28XZE?

A 0.47µF X5R or X7R ceramic capacitor is required and sufficient for stability, per the datasheet. It must be placed as close as possible to the VOUT and GND pins to minimize parasitic inductance. Larger values (e.g., 1µF) are acceptable but do not improve stability margins beyond what the internal compensation provides.

Does PT7M8216B28XZE require an input capacitor?

Yes - a 0.47µF X5R/X7R ceramic capacitor is recommended on VIN to GND, located adjacent to the IC. This reduces high-frequency input impedance, improves PSRR, and prevents instability caused by trace inductance between the power source and regulator input.

Can the NC pin (Pin 5) be left unconnected?

Yes - Pin 5 is a no-connect terminal. The datasheet explicitly states that leaving it open is acceptable, though connecting it to GND is preferred for mechanical robustness and EMI mitigation in high-density layouts.

How does the EN pin behave during power-up sequencing?

The EN pin is high-active with 1.2V minimum threshold. During power-up, VIN must reach operational range (≥1.7V) before EN is asserted; if EN rises before VIN stabilizes, the output may exhibit overshoot or delayed regulation. Best practice is to tie EN to VIN through a resistor divider or use a dedicated sequencer to ensure proper timing.