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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated PT7M8218B25CEX

Name: PT7M8218B25CEX
Brand: Diodes Incorporated
SKU: PT7M8218B25CEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7M8218B25CEX

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: PT7M8218B25CEX.pdf

Description:: IC REG LINEAR 2.5V 300MA SC70-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PT7M8218B25CEX 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. It operates from 1.7V to 5.5V input and supports mobile RF power rails in GSM/CDMA baseband subsystems.

For engineers reviewing the PT7M8218B25CEX datasheet, PT7M8218B25CEX pinout, PT7M8218B25CEX application, or PT7M8218B25CEX equivalent, key selection criteria include guaranteed 300mA output current with 0.47µF ceramic capacitors, auto output discharge, thermal shutdown at 170°C, and SC70-5L package compatibility for space-constrained portable designs.

Technical Context

The PT7M8218B25CEX uses a P-channel MOSFET pass element controlled by an error amplifier comparing output voltage against an internal reference. Its internal phase compensator enables stability with low-ESR 0.47µF X5R/X7R ceramic capacitors on both input and output.

EN pin logic is high-active (V_ENH ≥1.2V), enabling precise system-level power sequencing. Protection features include foldback current limiting (400mA typical) and thermal shutdown with 20°C hysteresis, ensuring robust operation under transient overload or ambient temperature extremes from –40°C to +85°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5V fixed, ±2% initial accuracy ensures stable core voltage for 2.5V I/O domains in mobile SoCs.
Max Output Current	300mA guaranteed - sufficient for baseband processors, RF transceivers, or camera sensor bias rails.
Dropout Voltage	150mV @150mA (V_OUT=2.8V) - enables efficient regulation even as battery voltage drops to ~2.65V.
PSRR	75dB @1kHz - suppresses switching noise from DC-DC converters feeding adjacent analog/RF circuitry.
Quiescent Current	36µA typical - minimizes standby power loss in always-on mobile subsystems.
Operating Temp	–40°C to +85°C - validated for consumer handheld and industrial portable equipment environments.
Capacitor Support	Stable with 0.47µF ceramic (X5R/X7R) - reduces BOM count and PCB area vs. tantalum or larger ceramics.

Pinout & Package

PT7M8218B25CEX is packaged in SC70-5L (JEDEC MO-203B/AA), a 2.2mm × 1.35mm × 0.9mm surface-mount package optimized for high-density portable PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 - VIN	Input supply rail	Accepts 1.7–5.5V; requires local 0.47µF ceramic bypass to GND for noise filtering and loop stability.
2 - GND	Power ground reference	Low-impedance return path for all internal circuits; must be connected directly to system ground plane.
3 - EN	Enable control input	High-active logic (≥1.2V); drives regulator ON; floating or low disables output and activates auto-discharge.
4 - NC	No-connect terminal	Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction.
5 - VOUT	Regulated output	Delivers 2.5V ±2%; requires 0.47µF ceramic capacitor to GND within 2mm of pin for transient response and stability.

Key Features

Feature	Design Value
Auto output discharge	Activates internal 50Ω discharge path when EN = LOW, ensuring rapid VOUT ramp-down to prevent latch-up in multi-rail systems.
Low-noise operation	60µV_RMS output noise (10Hz–100kHz) - preserves SNR in audio codecs and RF synthesizer VCO supplies.
Thermal shutdown protection	Triggers at 170°C junction temperature with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking.
High accuracy over temperature	±100ppm/°C output drift - maintains <±3% total variation across –40°C to +85°C, critical for precision analog sensors.
Small-footprint packaging	SC70-5L footprint (2.2mm × 1.35mm) - saves >40% board area vs. SOT23-5L while maintaining identical pinout and thermal performance.

Applications

Mobile Baseband Power

GSM/CDMA Transceiver Bias

Use Scenario: Powering baseband processor I/O banks requiring clean, stable 2.5V supply in dual-mode (GSM/CDMA) smartphones.

IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.5V to digital I/O interfaces with fast load transient response (<20µs recovery).

Use Value: 75dB PSRR rejects noise from switching PMICs; 36µA quiescent current extends standby battery life without sacrificing wake-up speed.

Use Scenario: Supplying bias voltage to RF front-end ICs including power amplifiers and low-noise amplifiers in cellular handsets.

IC Role / Device Role / Timing Role: Low-noise post-regulator cleaning up DC-DC converter ripple before sensitive RF signal paths.

Use Value: 60µV_RMS output noise and 150mV dropout enable high-efficiency PA operation down to 2.65V battery voltage while preserving EVM.

Digital Still Camera Sensor Rail

Portable Media Player Audio Codec

Use Scenario: Providing clean 2.5V supply to CMOS image sensor analog front-end and ADC reference in compact DSCs.

IC Role / Device Role / Timing Role: Precision voltage source with ±2% accuracy and low tempco for consistent pixel response calibration.

Use Value: ±100ppm/°C drift ensures <±3% output variation across operating temperature, minimizing white balance drift.

Use Scenario: Powering stereo audio DAC/ADC and headphone amplifier in MP3 players with tight size constraints.

IC Role / Device Role / Timing Role: Low-quiescent-current LDO enabling >20-hour playback while supporting dynamic audio load transients.

Use Value: Auto output discharge prevents pop/click during power cycling; SC70-5L footprint fits within 3×3mm camera module zones.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P252MR	250mA max output, 2.5V fixed, 120mV dropout @100mA, no EN pin	Lacks enable control and auto-discharge; limited to always-on rails	Select when system-level sequencing is handled externally and 250mA suffices.
Richtek RT9193-25GB	300mA, 2.5V fixed, 250mV dropout @150mA, 65dB PSRR @1kHz	Higher dropout and lower PSRR reduce efficiency and noise rejection in RF-sensitive designs	Prefer only if SC70-5L footprint compatibility is secondary to cost or stock availability.

Compared with XC6206P252MR and RT9193-25GB, PT7M8218B25CEX uniquely combines 300mA drive, 75dB PSRR, EN control, and auto-discharge in SC70-5L-making it optimal for sequenced, noise-sensitive mobile power rails where space and performance are co-constrained.

Availability

PT7M8218B25CEX is available at Aetrix Electronics and suitable for mobile baseband power, RF transceiver bias, digital camera sensor rails, and portable media player audio codec supplies requiring stable component supply across production lifecycles.

Supply support for PT7M8218B25CEX 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.

The PT7M8218 series targets ultra-low-power, space-constrained portable devices-designed specifically for GSM/CDMA/PDC handset subsystems needing high-accuracy, low-noise, and fast-transient LDO regulation.

FAQ

What is the minimum input voltage required for stable 2.5V output at full 300mA load?

The PT7M8218B25CEX requires VIN ≥ VOUT + VDROPOUT. At 300mA, dropout rises to ~220mV (extrapolated from 150mV @150mA and typical curve data). Thus, minimum VIN is 2.5V + 0.22V = 2.72V. Operation below this risks output collapse under full load.

Can the NC pin (Pin 4) be left floating in production PCB layout?

Yes, Pin 4 is internally unconnected and may float per datasheet, but Pericom recommends tying it to GND to improve mechanical anchoring and reduce potential EMI coupling into adjacent signal traces-especially critical in RF-dense mobile PCBs.

Does the 0.47µF output capacitor requirement apply to all ceramic dielectrics?

No-only X5R and X7R dielectrics are validated. Y5V and Z5U types exhibit excessive capacitance shift with DC bias and temperature, risking instability. The 0.47µF value assumes ≥80% effective capacitance at rated voltage and operating temperature.

How does auto output discharge behave during partial system power-down?

When EN is pulled LOW, the internal 50Ω discharge path connects VOUT to GND, discharging 10µF output capacitance in <500µs. This prevents back-powering of upstream circuitry and eliminates reset glitches caused by slow VOUT decay in multi-rail systems.

PT7M8218B25CEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.18V @ 150mA (Typ)

Current - Output:: 300mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-5

PT7M8218B25CEX FAQ

1.How can I place an order for PT7M8218B25CEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7M8218B25CEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PT7M8218B25CEX reliable?

The price and inventory of PT7M8218B25CEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B25CEX is usually 5 days.

3.What payment methods are accepted for PT7M8218B25CEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M8218B25CEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7M8218B25CEX?

PT7M8218B25CEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7M8218B25CEX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PT7M8218B25CEX?

For technical support, including PT7M8218B25CEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B25CEX requirements.

6.How does Aetrix verify that PT7M8218B25CEX is sourced from the original manufacturer or authorized distributors?

All PT7M8218B25CEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PT7M8218B25CEX meets industry standards.

7.What is the process for return or replacement of PT7M8218B25CEX?

All PT7M8218B25CEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B25CEX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PT7M8218B25CEX part is unused and in its original packaging.

Return procedure for PT7M8218B25CEX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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