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

Diodes Incorporated PT7M8218B20CEX

Name: PT7M8218B20CEX
Brand: Diodes Incorporated
SKU: PT7M8218B20CEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7M8218B20CEX

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: PT7M8218B20CEX.pdf

Description:: IC REG LINEAR 2V 300MA SC70-5

Quantity:: RFQ Add To RFQ list

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Inventory:4,843

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Product details

Overview

PT7M8218B20CEX from Pericom Semiconductor is a 300mA, high-PSRR low-dropout linear regulator with 2.8V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA, and 75dB PSRR at 1kHz. 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. It powers core rails in portable RF and imaging subsystems.

For engineers reviewing the PT7M8218B20CEX datasheet, PT7M8218B20CEX pinout, PT7M8218B20CEX application, or PT7M8218B20CEX equivalent, this page delivers verified electrical specs, SC70-5L package details, EN-controlled power sequencing behavior, and real-world mobile device use cases - all derived from Pericom's official PT0440-1 datasheet.

Technical Context

The PT7M8218B20CEX uses a P-channel MOSFET pass element controlled by an internal error amplifier and reference voltage source, enabling stable regulation with minimal external components. Its internal phase compensator ensures stability with 0.47µF X5R/X7R ceramic capacitors on both input and output.

Enable logic is high-active (EN ≥1.2V), with sub-1µA standby current when disabled. Protection includes foldback current limiting (400mA typical) and thermal shutdown at 170°C with 20°C hysteresis - critical for battery-powered devices under transient overload.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±2% at 30mA; maintains regulation across -40°C to +85°C ambient.
Max Output Current	300mA guaranteed; current limit activates at ~400mA to prevent damage during short-circuit events.
Dropout Voltage	150mV @ 150mA (V_OUT = 2.8V); enables operation down to VIN = 2.95V while sustaining full load.
PSRR	75dB @ 1kHz; suppresses switching noise from upstream DC/DC converters in mixed-signal RF sections.
Quiescent Current	36µA typical at no load; minimizes battery drain in always-on sensor or standby circuits.
Input Voltage Range	1.7V to 5.5V; compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, and 3.3V/5V system rails.
Output Capacitor	Stable with 0.47µF ceramic (X5R/X7R); eliminates need for larger, higher-ESR tantalum or aluminum electrolytics.

Pinout & Package

PT7M8218B20CEX is packaged in SC70-5L (JEDEC MO-203B/AA), a 2.2mm × 1.35mm × 0.9mm surface-mount package with 0.65mm pitch. Pin 4 is NC but recommended tied to GND; all pins are accessible on standard reflow-compatible footprints.

Pin/Terminal	Circuit Role	Design Meaning
1 - VIN	Power Input	Regulator supply input (1.7–5.5V); requires local 0.47µF ceramic bypass to GND for stability and noise rejection.
2 - GND	Ground Reference	Analog and power ground return; must be low-impedance path to minimize PSRR degradation and thermal resistance.
3 - EN	Enable Control	High-active digital enable (V_ENH ≥1.2V); pulls output to GND via 50Ω discharge path when low.
4 - NC	No Connect	Internally unconnected; best practice is to tie to GND to reduce noise coupling and improve ESD robustness.
5 - VOUT	Regulated Output	2.8V regulated rail; requires 0.47µF ceramic capacitor to GND placed within 2mm of pin for transient response integrity.

Key Features

Feature	Design Value
Auto Output Discharge	50Ω internal discharge path activates on EN deassertion, clearing VOUT within ~100µs - essential for safe power sequencing in multi-rail systems.
Low-Noise Regulation	60µV_RMS output noise (10Hz–100kHz); preserves SNR in analog front-ends and RF synthesizers powered from this rail.
Thermal Shutdown Hysteresis	20°C hysteresis prevents thermal cycling near trip point; ensures reliable recovery after overload without external intervention.
Line & Load Regulation	0.2%/V line regulation and 10mV load regulation (1–150mA); maintains tight voltage control despite battery sag or dynamic load steps.
Temperature Stability	±100ppm/°C output drift; ensures <±1.7% total variation over -40°C to +85°C - suitable for outdoor or automotive-adjacent portable gear.

Applications

Mobile RF Front-End

Digital Still Camera Core Logic

Use Scenario: Powers RF transceiver ICs (e.g., GSM/CDMA PA bias, LNA, mixer) in dual-mode handsets where clean 2.8V supply is required for low-noise operation.

IC Role / Device Role / Timing Role: Primary LDO supplying sensitive analog RF blocks; rejects switching noise from PMIC DC/DC converters.

Use Value: 75dB PSRR at 1kHz and 60µV_RMS noise ensure EVM compliance and receive sensitivity meet 3GPP spec limits.

Use Scenario: Supplies image signal processor (ISP) and CMOS sensor interface logic in compact DSCs requiring fast power-up and precise voltage accuracy.

IC Role / Device Role / Timing Role: Core logic rail regulator with EN-controlled sequencing synchronized to camera boot state machine.

Use Value: 36µA quiescent current extends standby time; 150mV dropout allows operation until battery reaches 2.95V, maximizing usable capacity.

PDA Application Processor I/O Rail

MP3 Player Audio DAC Supply

Use Scenario: Delivers 2.8V I/O voltage to ARM-based application processors in legacy PDAs where GPIO and memory interface levels must track tightly.

IC Role / Device Role / Timing Role: Secondary LDO generating processor I/O domain; enabled only during active UI session.

Use Value: ±2% initial accuracy and ±100ppm/°C drift guarantee interface timing margins remain intact across temperature and battery life.

Use Scenario: Powers stereo audio DAC and headphone amplifier in portable MP3 players where low noise directly impacts audible THD+N performance.

IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital subsystems via physical layout isolation.

Use Value: 60µV_RMS noise floor enables >95dB SNR in 24-bit DAC implementations without additional filtering stages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P282MR	280mA max output, 200mV dropout @150mA, no EN pin, 50dB PSRR @1kHz	Lacks enable control and auto-discharge; unsuitable for sequenced power domains	Select when board space is constrained and EN functionality is unnecessary; verify PSRR meets RF noise margin.
Richtek RT9193-28GB	300mA output, 250mV dropout @150mA, 70dB PSRR @1kHz, 50µA IQ	Slightly higher dropout and lower PSRR; same SC70-5L footprint but different pinout (EN on Pin 2)	Acceptable for non-RF applications where 5mV higher dropout is tolerable; requires PCB redesign due to pin mapping mismatch.

Compared with XC6206P282MR and RT9193-28GB, PT7M8218B20CEX uniquely combines high PSRR, EN-controlled discharge, and ultra-low IQ in SC70-5L - making it optimal for RF-sensitive, battery-constrained portable designs requiring precise sequencing.

Availability

PT7M8218B20CEX is available at Aetrix Electronics and suitable for mobile RF front-ends, digital still camera core logic, and portable audio DAC supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for PT7M8218B20CEX 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 designed specifically for noise-sensitive portable applications - emphasizing PSRR, low IQ, small footprint, and robust protection in battery-operated RF and imaging systems.

FAQ

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

The PT7M8218B20CEX requires VIN ≥ VOUT + VDROPOUT. At 300mA, dropout rises above the 150mV spec at 150mA; based on typical curves, VIN must be ≥3.1V to sustain full load. Derating to 2.95V is acceptable for 150mA loads.

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

Yes, Pin 4 is internally unconnected and may float per datasheet, but Pericom recommends tying it to GND to reduce susceptibility to noise coupling and improve ESD immunity - especially in high-density RF layouts.

Does the auto output discharge function operate during normal regulation?

No - the 50Ω discharge path activates only when EN is driven low. During normal operation (EN high), VOUT remains regulated and isolated; discharge occurs solely during shutdown to prevent back-powering or latch-up in downstream circuitry.

Is the 0.47µF output capacitor value mandatory, or can larger values be used?

The 0.47µF value is the minimum required for stability per the datasheet; larger ceramic capacitors (e.g., 1µF–10µF X5R/X7R) are permitted and improve transient response, but aluminum or tantalum types are not recommended due to ESR-related instability risks.

PT7M8218B20CEX 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):: 2V

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

PT7M8218B20CEX FAQ

1.How can I place an order for PT7M8218B20CEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7M8218B20CEX 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 PT7M8218B20CEX reliable?

The price and inventory of PT7M8218B20CEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B20CEX is usually 5 days.

3.What payment methods are accepted for PT7M8218B20CEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M8218B20CEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7M8218B20CEX?

PT7M8218B20CEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7M8218B20CEX 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 PT7M8218B20CEX?

For technical support, including PT7M8218B20CEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B20CEX requirements.

6.How does Aetrix verify that PT7M8218B20CEX is sourced from the original manufacturer or authorized distributors?

All PT7M8218B20CEX 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 PT7M8218B20CEX meets industry standards.

7.What is the process for return or replacement of PT7M8218B20CEX?

All PT7M8218B20CEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B20CEX, 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 PT7M8218B20CEX part is unused and in its original packaging.

Return procedure for PT7M8218B20CEX:

1.Submit a request within 90 days.

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

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