Diodes Incorporated PT7M8216B28XYEX

Overview

PT7M8216B28XYEX from Pericom Semiconductor is a 2.8V fixed-output, 300mA low-dropout linear regulator in a 0.8mm×0.8mm UDFN-4L package, featuring 150mV dropout at 150mA, ±2% initial output accuracy, 75dB PSRR at 1kHz, and 36μA quiescent current - designed for power-sensitive portable RF and baseband circuits.

For engineers reviewing the PT7M8216B28XYEX datasheet, PT7M8216B28XYEX pinout, PT7M8216B28XYEX application, or PT7M8216B28XYEX equivalent, key selection criteria include ultra-small footprint compatibility, guaranteed 300mA load capability with ceramic capacitors ≥0.47μF, EN-controlled sequencing, and thermal/current protection for battery-powered mobile subsystems.

Technical Context

The PT7M8216B28XYEX integrates a P-channel MOSFET pass element, precision bandgap reference, error amplifier with internal phase compensation, and auto-discharge circuitry - enabling stable regulation with only 0.47μF X5R/X7R ceramic input/output capacitors. Its high PSRR (75dB @1kHz) and low 60μV_RMS output noise support noise-sensitive analog and RF blocks.

Control logic includes high-active EN pin with 1.2V threshold, thermal shutdown at 170°C (20°C hysteresis), and foldback current limiting (400mA typical). The device operates across –40°C to +85°C ambient and supports input voltages from 1.7V to 5.5V - making it suitable for single-cell Li-ion and multi-cell alkaline/battery-backed systems.

Key Specifications

Pinout & Package

PT7M8216B28XYEX is housed in a Pb-free, green 0.8mm×0.8mm UDFN-4L package with bottom-side thermal pad (exposed die attach). Pin 5 is NC and may be left floating or tied to GND.

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, PT7M8216B28XYEX offers the lowest dropout (150mV), smallest package (0.8mm×0.8mm), and integrated auto-discharge - giving superior battery efficiency, board space savings, and simplified power sequencing in space-constrained mobile designs.

Availability

PT7M8216B28XYEX is available at Aetrix Electronics and suitable for mobile baseband power, RF transceiver bias, digital camera ISP core, and portable audio codec applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for PT7M8216B28XYEX 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) is a fabless analog and mixed-signal IC provider specializing in high-performance interface, timing, and power management solutions for communications and consumer electronics.

PT7M8216 belongs to Pericom's ultra-low-noise, miniature LDO family - engineered specifically for battery-powered portable devices where size, efficiency, and noise immunity are critical design constraints.

FAQ

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

The PT7M8216B28XYEX requires VIN ≥ VOUT + VDROPOUT. At 300mA, dropout rises above the 150mV spec (given at 150mA); typical max dropout at 300mA is ~220mV per characterization curves. Thus, minimum stable input is ~3.02V. For full 300mA capability across temperature, use VIN ≥3.1V.

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

Yes - Pin 5 is explicitly designated as "NC" (No Connect) in the datasheet. It may be left floating or tied to GND; neither configuration affects regulation, stability, or protection functions. No internal circuitry connects to this terminal.

Does PT7M8216B28XYEX require an input capacitor?

Yes - a 0.47μF ceramic capacitor (X5R/X7R) is required between VIN and GND, placed as close as possible to the pins. This stabilizes the input rail, reduces high-frequency noise coupling, and prevents oscillation during load transients, as confirmed by functional testing in the datasheet's application circuits.

How does the auto output discharge function operate?

When EN is pulled low, an internal 50Ω switch connects VOUT to GND, actively discharging the output capacitor. This ensures rapid, controlled power-down without floating voltages that could cause latch-up or back-powering in multi-rail systems - verified by oscilloscope waveforms in the "Turn Off Speed" test figure.