Diodes Incorporated PT7M8216B33XZE

Overview

PT7M8216B33XZE from Pericom Semiconductor is a 3.3V fixed-output, 300mA low-dropout linear regulator with 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 - designed for power-sensitive portable RF and baseband subsystems.

For engineers reviewing the PT7M8216B33XZE datasheet, PT7M8216B33XZE pinout, PT7M8216B33XZE application, or PT7M8216B33XZE equivalent, key selection criteria include guaranteed 300mA load capability under 1.7–5.5V input, UDFN-4L 1mm×1mm or 0.8mm×0.8mm footprint constraints, EN pin high-active control logic, and stable operation with low-ESR ceramic caps in space-constrained mobile audio/RF chains.

Technical Context

The PT7M8216B33XZE uses a P-channel MOSFET pass device with internal phase compensation optimized for stability with 0.47µF X5R/X7R ceramic capacitors on both input and output. Its error amplifier compares a trimmed bandgap reference against the regulated output, enabling ±2% initial accuracy and ±100ppm/°C temperature drift over –40°C to +85°C.

EN pin logic is high-active (VENH ≥1.2V), enabling fast turn-on/turn-off response (typ. 20µs) and sub-1µA standby current (0.05–1µA). Protection includes foldback current limiting (400mA typical trip), short-circuit current limit (40mA), and thermal shutdown at 170°C with 20°C hysteresis.

Key Specifications

Pinout & Package

PT7M8216B33XZE is packaged in Pb-free, RoHS-compliant UDFN-4L: either 1.0mm × 1.0mm (XZ suffix) or 0.8mm × 0.8mm (XY suffix), both with 0.4mm pitch and bottom-exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B332MR-G and RT9013-33GB, PT7M8216B33XZE uniquely combines UDFN-4L miniaturization, auto-discharge, and 75dB PSRR - making it optimal for next-gen compact RF/audio subsystems where board area, power sequencing integrity, and noise rejection are co-constrained.

Availability

PT7M8216B33XZE is available at Aetrix Electronics and suitable for cellular baseband power, RF transceiver bias, digital camera sensor core, and portable audio codec supply requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PT7M8216B33XZE 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 before its 2017 acquisition.

The PT7M8216 series targets ultra-compact, battery-powered portable devices - delivering high PSRR, low IQ, and miniature UDFN packaging to meet stringent size and efficiency demands in mobile RF and multimedia subsystems.

FAQ

What is the minimum input voltage required for PT7M8216B33XZE to maintain regulation at 300mA load?

The datasheet specifies a maximum dropout voltage of 200mV for 3.3V output at full 300mA load. Therefore, minimum input voltage is 3.3V + 0.2V = 3.5V. Below this, output voltage drops proportionally with input - confirmed by Figure 1 (VOUT vs. IOUT at VIN=4.3V/5.0V/5.5V) showing stable 3.3V up to 300mA only when VIN ≥4.3V.

Does PT7M8216B33XZE require an input capacitor, and if so, what value and type?

Yes - a 0.47µF X5R or X7R ceramic capacitor is required on VIN, placed as close as possible to Pins 4 (VIN) and 2 (GND). This stabilizes the input rail against source impedance and improves transient response. The block diagram and "Note on Use" explicitly mandate low-ESR ceramic input capacitance for reliable operation.

Can the NC pin (Pin 5) be left floating, or must it be connected?

Pin 5 is designated NC (no-connect) and may be left floating per datasheet, but the "Note on Use" recommends connecting it to GND for improved mechanical reliability and reduced EMI susceptibility. Floating is functionally acceptable but not optimal for production-grade designs where board-level noise immunity is critical.

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

When EN is pulled LOW, the internal 50Ω discharge path between VOUT and GND activates, discharging the output capacitor rapidly. Measured discharge time depends on COUT value - e.g., with 0.47µF, VOUT falls from 3.3V to <0.1V in <25µs. This prevents back-powering of upstream circuitry and ensures clean power-down sequencing.