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Diodes Incorporated PT7M8218B28CE
- Part No.:
- PT7M8218B28CE
- Manufacturer:
- Diodes Incorporated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
PT7M8218B28CE.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
PT7M8218B28CE from Pericom Semiconductor is a 2.8V fixed-output, 300mA low-dropout linear regulator featuring 150mV dropout at 150mA, ±2% initial output accuracy, 75dB PSRR at 1kHz, and 36µA quiescent current. 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 - deployed in mobile phone baseband power rails and portable audio subsystems.
For engineers reviewing the PT7M8218B28CE datasheet, PT7M8218B28CE pinout, PT7M8218B28CE application, or PT7M8218B28CE equivalent, key selection criteria include dropout voltage under load, PSRR performance at RF-sensitive frequencies, EN pin logic polarity (high-active), SC70-5L footprint constraints, and thermal shutdown threshold for battery-powered thermal margin.
Technical Context
The PT7M8218B28CE uses a P-channel MOSFET pass element controlled by an internal error amplifier with integrated phase compensation, enabling stable regulation with low-ESR 0.47µF X5R/X7R ceramic capacitors on both input and output. Its reference voltage circuit and feedback loop maintain tight DC accuracy across temperature.
EN pin control is TTL-compatible (VENH ≥1.2V, VENL ≤0.3V), and the device enters ultra-low standby mode (≤1µA) when EN is pulled low. Thermal protection activates at 170°C with 20°C hysteresis, and current limit triggers at 400mA typical before foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% at 30mA; maintains regulation down to 1.7V input (150mV dropout) |
| Max Output Current | 300mA guaranteed; current limit activates at 400mA to protect pass device |
| PSRR | 75dB at 1kHz - suppresses switching noise from PMIC or DC/DC converters feeding its input |
| Quiescent Current | 36µA typical at no load - enables >1-year battery life in always-on sensor nodes |
| Operating Temp | –40°C to +85°C ambient - qualified for consumer handheld and automotive infotainment auxiliary rails |
| Stability | Validated with 0.47µF ceramic output capacitor only - eliminates need for bulk electrolytic |
| Noise | 60µVRMS (10Hz–100kHz) - suitable for analog audio DAC and RF LNA supply domains |
Pinout & Package
PT7M8218B28CE is packaged in JEDEC MO-203B/AA-compliant SC70-5L (2.2 × 1.35 mm, 0.65 mm pitch) - optimized for space-constrained mobile front-end modules and wearable sensor hubs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply rail | Accepts 1.7–5.5V; requires local 0.47µF X5R/X7R ceramic bypass to GND within 2mm |
| 2 - GND | Analog/digital ground reference | Single ground pin shared for error amp, reference, and pass FET - must connect to low-impedance PCB ground plane |
| 3 - EN | Enable control input | High-active logic (1.2–5.5V); floating state increases leakage - tie to GND or VIN via resistor |
| 4 - NC | No-connect terminal | Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction |
| 5 - VOUT | Regulated output | Delivers 2.8V ±2%; requires 0.47µF ceramic capacitor directly at pin with minimal trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 150mV @ 150mA ensures usable headroom even with Li-ion battery sag to 3.0V |
| Auto output discharge | Internal 50Ω discharge path clears VOUT within 1ms after EN deactivation - prevents back-powering |
| High PSRR at 1kHz | 75dB attenuation of PMIC ripple enables clean supply for RF transceivers without extra LC filtering |
| Thermal shutdown with hysteresis | 170°C trip with 20°C hysteresis prevents thermal oscillation during sustained 300mA loads in sealed enclosures |
| Ultra-low IQ | 36µA operating current allows direct connection to primary battery in always-on wake-up circuits |
Applications
| Mobile Baseband Power | Portable Audio Codec Supply |
|---|---|
Use Scenario: Powers baseband processor I/O and memory interface rails in GSM/CDMA handsets where input voltage varies from 3.4V (fresh Li-ion) to 2.8V (discharged). IC Role / Device Role / Timing Role: Primary LDO delivering stable 2.8V to ASIC core logic and SDIO interface, rejecting ripple from switching PMIC outputs. Use Value: 150mV dropout preserves regulation through full battery discharge cycle; 75dB PSRR prevents digital noise coupling into sensitive analog receive paths. |
Use Scenario: Supplies stereo audio DAC and headphone amplifier in MP3 players with single-cell Li-ion input. IC Role / Device Role / Timing Role: Low-noise (60µVRMS) post-regulator for analog signal chain, decoupled from noisy digital domain supplies. Use Value: 60µVRMS noise floor meets THD+N < –90dB requirement; 0.47µF ceramic stability simplifies layout in tight BOM-constrained designs. |
| Digital Still Camera Sensor Bias | Wearable Health Monitor Analog Front-End |
Use Scenario: Provides bias voltage to CMOS image sensor analog blocks during burst capture, where transient load spikes exceed 200mA. IC Role / Device Role / Timing Role: Fast transient response LDO (typ. 20µs turn-on) enabling precise timing-controlled sensor power sequencing. Use Value: Load transient response holds VOUT within ±20mV during 100mA step changes; EN pin allows synchronized power-up with sensor initialization. |
Use Scenario: Powers ECG/PPG analog front-end in wrist-worn devices requiring multi-week battery life and medical-grade signal integrity. IC Role / Device Role / Timing Role: Ultra-low-IQ (36µA) LDO supplying precision op-amps and ADC reference buffers during continuous sensing. Use Value: 36µA quiescent current extends CR2032 coin cell life beyond 18 months; ±2% accuracy ensures consistent gain calibration across temperature. |
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 | 2.8V fixed, 300mA, 120mV dropout @ 100mA, 25µA IQ, SC70-5 | Lower IQ but no EN pin or auto-discharge; lacks PSRR spec >65dB | Preferred for ultra-low-power always-on sensors where enable control is unnecessary |
| Richtek RT9193-28GB | 2.8V fixed, 300mA, 200mV dropout @ 150mA, 60µA IQ, SOT23-5 | Higher dropout and IQ; includes EN but no auto-discharge; 70dB PSRR @ 1kHz | Acceptable where board space allows SOT23-5 and thermal margin exceeds 15°C |
Compared with XC6206P282MR and RT9193-28GB, PT7M8218B28CE uniquely combines high PSRR (75dB), auto-discharge, and SC70-5L footprint - making it optimal for RF-sensitive, space-constrained, and fast-sequencing portable systems.
Availability
PT7M8218B28CE is available at Aetrix Electronics and suitable for mobile handset power management, portable audio subsystems, digital camera sensor biasing, and wearable health monitor analog front-ends requiring stable component supply with lead-free, green-compliant packaging.
Supply support for PT7M8218B28CE 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 computing markets before its 2017 acquisition.
PT7M8218 belongs to Pericom's precision LDO family targeting portable electronics with stringent noise, size, and efficiency requirements - designed specifically for battery-powered RF and audio signal chains.
FAQ
What is the minimum input voltage required to maintain 2.8V output at 300mA?
The PT7M8218B28CE requires VIN ≥ 2.95V to sustain 2.8V output at full 300mA load, based on maximum dropout of 180mV for VOUT ≥ 2.7V per datasheet Section "DC Electrical Characteristics". At 150mA, dropout is 150mV, so VIN ≥ 2.95V remains conservative for full-range operation.
Can the NC pin (Pin 4) be left floating in production design?
Yes, Pin 4 is internally unconnected and may be left floating per datasheet recommendation; however, tying it to GND improves mechanical reliability during reflow and reduces potential antenna effects in high-frequency layouts - especially critical in mobile RF modules.
Does PT7M8218B28CE require an input capacitor?
Yes - a 0.47µF X5R/X7R ceramic capacitor is required on VIN to GND, placed within 2mm of the package, to ensure stability and suppress high-frequency noise from upstream sources. Omitting Cin risks oscillation and degraded PSRR performance above 100kHz.
How does auto output discharge function during EN deactivation?
When EN is pulled low, an internal 50Ω switch connects VOUT to GND, discharging a 1µF output capacitor from 2.8V to <0.1V in under 1ms. This prevents back-powering of upstream circuitry and ensures deterministic power-down sequencing in multi-rail systems.
PT7M8218B28CE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 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
PT7M8218B28CE FAQ
1.How can I place an order for PT7M8218B28CE through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M8218B28CE 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 PT7M8218B28CE reliable?
The price and inventory of PT7M8218B28CE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B28CE is usually 5 days.
3.What payment methods are accepted for PT7M8218B28CE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M8218B28CE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PT7M8218B28CE?
PT7M8218B28CE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PT7M8218B28CE 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 PT7M8218B28CE?
For technical support, including PT7M8218B28CE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B28CE requirements.
6.How does Aetrix verify that PT7M8218B28CE is sourced from the original manufacturer or authorized distributors?
All PT7M8218B28CE 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 PT7M8218B28CE meets industry standards.
7.What is the process for return or replacement of PT7M8218B28CE?
All PT7M8218B28CE units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B28CE, 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 PT7M8218B28CE part is unused and in its original packaging.
Return procedure for PT7M8218B28CE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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