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Diodes Incorporated PT7M8218B18CEX
- Part No.:
- PT7M8218B18CEX
- Manufacturer:
- Diodes Incorporated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
PT7M8218B18CEX.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
PT7M8218B18CEX from Pericom Semiconductor is a 300mA, high-PSRR low-dropout linear regulator with 2.8V fixed output, ±2% initial accuracy, 150mV dropout at 150mA, and 75dB PSRR at 1kHz-designed for noise-sensitive portable power rails in mobile phones and digital cameras.
For engineers reviewing the PT7M8218B18CEX datasheet, PT7M8218B18CEX pinout, PT7M8218B18CEX application, or PT7M8218B18CEX equivalent, key selection criteria include guaranteed 300mA load capability with 0.47µF ceramic output capacitance, auto-discharge functionality, thermal shutdown at 170°C, and EN pin compatibility with 1.2V logic-high threshold.
Technical Context
The PT7M8218B18CEX integrates a P-channel MOSFET pass element, internal reference voltage source, error amplifier with phase compensation, and protection circuitry including current limit (400mA typ.) and thermal shutdown (170°C). It operates across 1.7V–5.5V input range while maintaining stable 2.8V output under load and temperature variation.
Its architecture supports ultra-low quiescent current (36µA typ.) and standby current (0.05µA typ.), enabling long battery life in always-on subsystems. The regulator is optimized for stability with 0.47µF X5R/X7R ceramic capacitors on both input and output, eliminating need for bulk electrolytic or tantalum components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% initial accuracy ensures precise rail generation without external feedback network. |
| Max Output Current | 300mA guaranteed minimum supports moderate-power RF ICs and camera sensor modules. |
| Dropout Voltage | 150mV @ 150mA enables operation down to 2.95V input for 2.8V rail-critical for single-cell Li-ion systems near end-of-discharge. |
| PSRR | 75dB @ 1kHz suppresses switching noise from adjacent DC/DC converters in mixed-signal PCB layouts. |
| Quiescent Current | 36µA typical allows >1-year battery life in standby mode for IoT endpoint sensors. |
| Operating Temp | −40°C to +85°C industrial range supports deployment in automotive infotainment and outdoor portable equipment. |
| EN Logic Threshold | 1.2V min high-level enables direct interface with 1.8V GPIO without level-shifting. |
Pinout & Package
PT7M8218B18CEX is packaged in SC70-5L (JEDEC MO-203B/AA), a 2.2mm × 1.35mm surface-mount package with 0.65mm pitch, optimized for space-constrained mobile applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply rail | Accepts 1.7V–5.5V; requires local 0.47µF X5R/X7R ceramic bypass to GND for stability and transient response. |
| 2 - GND | Power ground reference | Low-impedance return path for regulator core and output stage; must be connected directly to system ground plane. |
| 3 - EN | Enable control input | Active-high logic input (1.2V min high); floating or open-circuit increases leakage-tie to GND or VIN for defined state. |
| 4 - NC | No-connect terminal | Internally unconnected; recommended to tie to GND for mechanical robustness and EMI reduction. |
| 5 - VOUT | Regulated output | Delivers stable 2.8V; requires 0.47µF X5R/X7R ceramic capacitor placed within 2mm of pin for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 0.47µF ceramic output cap | Eliminates need for large, costly, or aging-prone electrolytic/tantalum capacitors-reduces BOM count and board area. |
| Auto output discharge | Internal 50Ω discharge path pulls VOUT to GND when EN = low, preventing back-powering of upstream circuits during shutdown. |
| High PSRR (75dB @ 1kHz) | Rejects ripple from noisy switchers (e.g., PMIC buck stages), preserving signal integrity in ADC, RF, and audio subsystems. |
| Thermal shutdown + current limit | Integrated 170°C shutdown with 20°C hysteresis and 400mA current limit protect against sustained overload or PCB trace failure. |
| Low quiescent current (36µA) | Minimizes standby power loss-enables multi-month battery operation in always-listening voice interfaces and sensor nodes. |
Applications
| Mobile Phone Baseband Power | Digital Camera Sensor Rail |
|---|---|
|
Use Scenario: Powering baseband processor I/O and memory interface in GSM/CDMA handsets operating from single-cell Li-ion (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 2.8V to high-speed data paths with minimal voltage droop during burst transmission. Use Value: 150mV dropout ensures full regulation down to 2.95V input-extending usable battery capacity by ~8% versus higher-dropout alternatives. |
Use Scenario: Supplying image sensor analog front-end and ISP core in compact digital still/video cameras. IC Role / Device Role / Timing Role: Low-noise, high-PSRR voltage source isolating sensitive analog pixel readout from digital switching noise. Use Value: 75dB PSRR at 1kHz suppresses DC/DC converter ripple, reducing fixed-pattern noise and improving SNR by ≥3dB. |
| PDA Application Processor Core | MP3 Player Audio Codec Bias |
|
Use Scenario: Providing stable 2.8V to ARM-based application processors in legacy PDAs with tight thermal envelopes. IC Role / Device Role / Timing Role: Low-quiescent-current LDO supporting dynamic voltage scaling and deep-sleep modes. Use Value: 36µA IQ enables >14-day standby with 200mAh battery-meeting OEM runtime requirements without firmware intervention. |
Use Scenario: Biasing DAC, headphone amplifier, and analog filter stages in portable MP3 players. IC Role / Device Role / Timing Role: Precision voltage reference ensuring consistent audio gain, THD, and channel balance across battery discharge cycle. Use Value: ±2% output accuracy maintains <0.1dB volume deviation over temperature and line/load-critical for consumer audio fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B282MR-G | Same 2.8V output, but 200mA max output current and 250mV dropout @ 100mA. | Limited to lower-power logic rails; unsuitable for camera sensor or RF PA bias requiring 300mA. | Select only if board space constraints favor Torex's USP-4 package and load never exceeds 200mA. |
| Richtek RT9193-28GB | 300mA rated, but 220mV dropout @ 150mA and no auto-discharge function. | Requires external discharge FET for safe shutdown sequencing in multi-rail systems. | Prefer when PSRR >70dB is not required and system design accommodates external discharge circuitry. |
Compared with XC6219B282MR-G and RT9193-28GB, PT7M8218B18CEX uniquely combines 300mA drive, 150mV dropout, auto-discharge, and 75dB PSRR in SC70-5L-making it optimal for space-constrained, noise-sensitive, high-reliability portable designs.
Availability
PT7M8218B18CEX is available at Aetrix Electronics and suitable for mobile phone baseband power, digital camera sensor rails, PDA application processor cores, and MP3 player audio codec bias requiring stable component supply across production lifecycles.
Supply support for PT7M8218B18CEX 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 timing, interface, and power management ICs for communications and consumer electronics before its 2016 acquisition.
PT7M8218 belongs to Pericom's precision LDO family targeting portable devices-designed for ultra-low noise, high PSRR, and minimal external component count in battery-powered systems.
FAQ
What is the minimum input voltage required to maintain regulation at 2.8V output?
The PT7M8218B18CEX maintains regulation down to VIN = VOUT + VDROPOUT. With 150mV typical dropout at 150mA, the minimum input is 2.95V. At full 300mA load, dropout rises to ≤200mV per datasheet limits-requiring ≥3.0V input for guaranteed regulation.
Can the NC pin (Pin 4) be left floating in production design?
No-while the datasheet states "leaving it open is also acceptable," best practice is to connect Pin 4 (NC) to GND. This improves mechanical anchoring, reduces potential for solder voids, and minimizes EMI coupling into the sensitive error amplifier node via parasitic capacitance.
Does the auto-discharge feature activate during thermal shutdown?
Yes-the auto-discharge circuit remains active whenever EN is low, regardless of cause (intentional disable or thermal shutdown). Internal logic forces EN low during thermal shutdown, engaging the 50Ω discharge path to safely collapse VOUT and prevent latch-up or back-biasing of downstream circuitry.
Is the 0.47µF output capacitor requirement valid for all output voltages in the PT7M8218 family?
Yes-the 0.47µF ceramic capacitor specification applies universally across all PT7M8218 variants (0.9V–3.3V), confirmed by stability testing in the datasheet's "Low ESR Capacitors" section and validated across multiple output voltage bins in Typical Performance Characteristics.
PT7M8218B18CEX 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):
- 1.8V
- 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
PT7M8218B18CEX FAQ
1.How can I place an order for PT7M8218B18CEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M8218B18CEX 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 PT7M8218B18CEX reliable?
The price and inventory of PT7M8218B18CEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B18CEX is usually 5 days.
3.What payment methods are accepted for PT7M8218B18CEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M8218B18CEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M8218B18CEX?
PT7M8218B18CEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M8218B18CEX 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 PT7M8218B18CEX?
For technical support, including PT7M8218B18CEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B18CEX requirements.
6.How does Aetrix verify that PT7M8218B18CEX is sourced from the original manufacturer or authorized distributors?
All PT7M8218B18CEX 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 PT7M8218B18CEX meets industry standards.
7.What is the process for return or replacement of PT7M8218B18CEX?
All PT7M8218B18CEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B18CEX, 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 PT7M8218B18CEX part is unused and in its original packaging.
Return procedure for PT7M8218B18CEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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