Diodes Incorporated PT7M8216B28XZEX

Overview

PT7M8216B28XZEX from Pericom Semiconductor is a 2.8V fixed-output, 300mA low-dropout linear regulator in a 1mm×1mm UDFN-4L package. It delivers high PSRR (75dB @ 1kHz), ultra-low quiescent current (36µA), and stable operation with only 0.47µF ceramic output capacitance-designed for power-sensitive portable RF subsystems requiring clean, regulated voltage under dynamic load.

For engineers reviewing the PT7M8216B28XZEX datasheet, PT7M8216B28XZEX pinout, PT7M8216B28XZEX application, or PT7M8216B28XZEX equivalent, key selection criteria include dropout voltage at 150mA (150mV), ±2% initial output accuracy, thermal shutdown threshold (170°C), EN pin logic (high-active), and compatibility with low-ESR X5R/X7R capacitors in space-constrained layouts.

Technical Context

The PT7M8216B28XZEX integrates a P-channel MOSFET pass element, precision bandgap reference, error amplifier with internal phase compensation, and protection circuitry including thermal shutdown (170°C) and current limiting (400mA typical). Its architecture enables stability with minimal 0.47µF ceramic output capacitance without external compensation.

It operates across 1.7V–5.5V input range and maintains regulation down to 150mV dropout at 150mA load for VOUT = 2.8V. The high PSRR (75dB @ 1kHz) and low output noise (60µVrms, 10Hz–100kHz) support noise-sensitive analog/RF blocks such as GSM/CDMA transceivers and camera sensor supplies.

Key Specifications

Pinout & Package

PT7M8216B28XZEX is housed in a lead-free, green-compliant 4-pin UDFN package measuring 1.0mm × 1.0mm × 0.5mm (max height), with wettable flank leads for automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B282MR-G and RP114K281D-TR-F, PT7M8216B28XZEX offers superior PSRR and integrated auto-discharge-critical for RF coexistence and zero-leakage shutdown-while maintaining identical 1mm×1mm footprint and capacitor compatibility.

Availability

PT7M8216B28XZEX is available at Aetrix Electronics and suitable for cellular baseband power, GSM/CDMA transceiver supply, and digital camera sensor bias requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PT7M8216B28XZEX 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) designs high-performance interface, timing, and power management ICs for communications, computing, and consumer electronics.

The PT7M8216 series targets ultra-compact, battery-powered portable devices needing high-accuracy, low-noise, and low-quiescent-current LDOs with minimal external components.

FAQ

What is the minimum input voltage required for PT7M8216B28XZEX to maintain 2.8V output at full 300mA load?

The datasheet specifies a maximum dropout voltage of 150mV at 150mA for VOUT = 2.8V. At 300mA, typical dropout rises to ~180mV. Therefore, minimum VIN is 2.8V + 0.18V = 2.98V. Operation below this risks output collapse under full load, especially at elevated temperature.

Can PT7M8216B28XZEX be used with 1µF ceramic output capacitors instead of the recommended 0.47µF?

Yes-larger ceramic capacitors (e.g., 1µF X5R) are acceptable and may improve transient response, but do not enhance stability beyond the 0.47µF minimum. Excess capacitance does not degrade performance, though it increases board area and cost without functional benefit for this regulator's internal compensation.

Is the NC pin (Pin 5) required to be connected, and what happens if left floating?

Pin 5 is labeled "NC" and explicitly stated as acceptable to leave open; however, the datasheet recommends connecting it to GND for optimal EMI immunity and thermal conduction. Floating it introduces no functional risk but may slightly reduce noise rejection in high-frequency environments.

Does PT7M8216B28XZEX support reverse current blocking when VIN < VOUT?

No-the device uses a P-channel MOSFET pass element, which inherently allows reverse current flow when VIN falls below VOUT. External reverse-blocking diodes or MOSFETs are required in systems where backfeed from the output rail must be prevented during input brownout or hot-swap events.