Diodes Incorporated PT7M8218B09CE

Overview

PT7M8218B09CE from Pericom Semiconductor is a 300mA, high-PSRR low-dropout linear regulator with 0.9V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA (V_OUT=2.8V), and 75dB PSRR at 1kHz - designed for power-sensitive portable electronics requiring stable, low-noise biasing of baseband processors and RF front-ends.

For engineers reviewing the PT7M8218B09CE datasheet, PT7M8218B09CE pinout, PT7M8218B09CE application, or PT7M8218B09CE equivalent, key selection criteria include guaranteed 300mA output under 1.7–5.5V input, auto-discharge capability, thermal shutdown at 170°C, SC70-5L/SOT23-5L package compatibility, and support for 0.47µF ceramic output capacitors.

Technical Context

The PT7M8218B09CE integrates a P-channel MOSFET pass element, internal reference, error amplifier with phase compensation, and EN-controlled on/off logic - enabling stable regulation with minimal external components. Its architecture supports fast load transient response (<50µs settling) and maintains stability with low-ESR 0.47µF X5R/X7R ceramic capacitors on both input and output.

It features dual protection circuitry: current-limiting (400mA typical) and thermal shutdown with 20°C hysteresis, ensuring robust operation in thermally constrained handheld enclosures. The EN pin is high-active with 1.2V logic threshold and sub-100nA leakage, enabling precise system-level power sequencing.

Key Specifications

Pinout & Package

PT7M8218B09CE is available in SC70-5L (JEDEC MO-203B/AA) and SOT23-5L (JEDEC MO-178C/AA) packages - both 5-pin surface-mount outlines with identical pin assignment and thermal performance optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P092MR and RT9193-09GB, PT7M8218B09CE offers superior PSRR (75dB), lower dropout (150mV), and a high-active EN pin compatible with standard 1.8V/3.3V logic - making it optimal for battery-powered systems demanding tight regulation, noise immunity, and controlled power sequencing.

Availability

PT7M8218B09CE is available at Aetrix Electronics and suitable for mobile baseband power, RF front-end biasing, digital camera sensor core, and portable audio codec supply requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for PT7M8218B09CE 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 analog and mixed-signal ICs for timing, connectivity, and power management in portable and communications systems.

The PT7M8218 series was developed to address stringent power integrity requirements in multi-rail mobile platforms - delivering high PSRR, ultra-low IQ, and small-footprint packaging for space- and battery-limited designs.

FAQ

What is the minimum input voltage required for stable 0.9V output at 300mA?

The PT7M8218B09CE requires VIN ≥ VOUT + VDROPOUT. With 150mV dropout at 150mA and typical 180mV at 300mA (per datasheet VOUT ≤2.7V condition), minimum VIN is 1.08V. However, absolute minimum operating VIN is specified as 1.7V - below which regulation is not guaranteed due to internal bias constraints and reference stability limits.

Can PT7M8218B09CE operate without an input capacitor?

No. The datasheet mandates a 0.47µF ceramic input capacitor (X5R/X7R) placed as close as possible to VIN and GND pins. Omitting it risks instability, increased noise susceptibility, and failure to meet PSRR or transient response specifications - especially under dynamic load conditions common in portable devices.

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

Pin 4 is confirmed as no-connect: internally unconnected and electrically isolated from all functional circuitry. While leaving it floating is acceptable per datasheet, tying it to GND improves mechanical anchoring and reduces potential antenna effects in high-frequency layouts - no electrical penalty applies.

How does the auto-discharge function behave during EN deactivation?

When EN is pulled low, the internal 50Ω discharge path connects VOUT to GND, discharging a 0.47µF output capacitor from 0.9V to <0.1V in approximately 22ms (τ = R×C = 50Ω × 0.47µF ≈ 23.5µs; full discharge ~5τ). This prevents residual voltage from interfering with downstream logic reset sequences or causing latch-up in powered-down peripherals.