Diodes Incorporated PT7M8218B25CE

Overview

PT7M8218B25CE from Pericom Semiconductor is a 300mA, high-PSRR low-dropout linear regulator with 2.5V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA (V_OUT=2.8V), and 75dB PSRR at 1kHz - designed for power-sensitive portable RF and digital baseband circuits in mobile handsets.

For engineers reviewing the PT7M8218B25CE datasheet, PT7M8218B25CE pinout, PT7M8218B25CE application, or PT7M8218B25CE equivalent, key selection criteria include guaranteed 300mA output under 1.7–5.5V input, auto output discharge, thermal shutdown at 170°C, EN pin control with 1.2V logic-high threshold, and stability with 0.47µF ceramic capacitors.

Technical Context

The PT7M8218B25CE integrates a P-channel MOSFET pass element, internal reference, error amplifier with phase compensation, current limit circuitry (400mA typical), and thermal shutdown (170°C with 20°C hysteresis). Its architecture enables stable regulation using only 0.47µF X5R/X7R ceramic capacitors on input and output.

EN pin operation is active-high with 1.2V minimum V_ENH, 0.3V maximum V_ENL, and sub-0.1µA leakage in both states. Output discharge is enabled via an internal 50Ω switch when EN is low, ensuring rapid V_OUT decay to prevent back-powering downstream circuitry.

Key Specifications

Pinout & Package

PT7M8218B25CE is available in SC70-5L (JEDEC MO-203B/AA) and SOT23-5L (JEDEC MO-178C/AA) packages - both 5-pin surface-mount, lead-free, and RoHS-compliant. The SC70-5L variant measures 2.0–2.2mm × 1.15–1.35mm × 0.9–1.1mm height; SOT23-5L measures 2.82–3.02mm × 1.5–1.7mm × 1.05–1.25mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P252MR and RT9193-25GB, PT7M8218B25CE delivers superior PSRR (75dB), lower dropout (150mV), and integrated auto-discharge - making it optimal for battery-constrained, multi-rail portable designs requiring precise sequencing and noise immunity.

Availability

PT7M8218B25CE is available at Aetrix Electronics and suitable for mobile handset baseband power, GSM/CDMA RF transceiver bias, and digital still camera sensor core applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for PT7M8218B25CE 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 2016 acquisition.

The PT7M8218 belongs to Pericom's precision LDO family targeting portable wireless devices - engineered for low-noise, low-quiescent-current operation with minimal external components in space-constrained PCB layouts.

FAQ

What is the minimum input voltage required for PT7M8218B25CE to maintain 2.5V output at 300mA?

The datasheet specifies a maximum dropout voltage of 150mV at 150mA for V_OUT ≥ 2.8V; for 2.5V output, worst-case dropout is not explicitly tabulated, but typical performance curves show <200mV at 300mA. Thus, 2.7V input is sufficient for full 300mA load at 2.5V output across temperature and process variation.

Can PT7M8218B25CE operate with a 0.22µF output capacitor?

No - the device is characterized and guaranteed stable only with ≥0.47µF ceramic capacitors (X5R/X7R dielectric). Using 0.22µF violates the stability condition and may cause oscillation or poor transient response, as confirmed by the manufacturer's application notes and test data.

Is the NC pin (Pin 4) electrically isolated or internally tied to another node?

Pin 4 is a true no-connect terminal with no internal connection to any circuit node. It is physically present for mechanical symmetry and package handling but carries zero electrical function - neither bonding wire nor silicon connection exists per the die layout and functional block diagram.

Does PT7M8218B25CE support reverse current blocking when VIN is disconnected while VOUT remains powered?

No - the device uses a P-channel MOSFET pass element, which inherently lacks reverse-current blocking capability. If VOUT is externally driven above VIN, body-diode conduction will occur, potentially damaging upstream sources or violating system isolation requirements unless external protection is added.