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onsemi CAT6218-285TDGT3
- Part No.:
- CAT6218-285TDGT3
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT6218-285TDGT3.pdf
- Description:
- IC REG LIN 2.85V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
CAT6218-285TDGT3 from onsemi is a 300 mA CMOS low-dropout linear regulator with 2.85 V fixed output, 180 mV typical dropout at full load, ±1.0% initial output voltage accuracy, and stable operation with only a 1 µF ceramic output capacitor. It delivers fast transient response in battery-powered consumer electronics requiring clean, regulated power from 2.3 V to 5.5 V input sources.
For engineers reviewing the CAT6218-285TDGT3 datasheet, pinout, applications, or equivalent options, key selection considerations include its zero-shutdown current, 150 µs turn-on time with external 10 nF bypass capacitor, thermal protection, fold-back current limiting, and TSOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The CAT6218-285TDGT3 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a CMOS architecture optimized for low quiescent current and high PSRR. Its internal UVLO disables regulation below 2.1 V input, and the 2.5 MΩ internal pull-down on EN ensures default-off behavior when unconnected.
It supports noise-sensitive analog and RF circuitry via the dedicated BYP pin-accepting a 10 nF capacitor to reduce output noise to 45 µVRMS (10 Hz–100 kHz) and improve PSRR to 64 dB at 1 kHz. The shutdown switch discharges the output capacitor through a 250 Ω internal path during disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±1.0% initial accuracy - ensures stable biasing for 2.8 V–3.0 V logic and analog ICs without external feedback. |
| Max Output Current | 300 mA guaranteed - sufficient to power microcontrollers, sensors, or RF front-ends in portable devices. |
| Dropout Voltage | 180 mV typical at 300 mA - enables regulation from 3.03 V input, extending battery runtime in single-cell Li-ion or alkaline systems. |
| Ground Current | 55 µA typical at no load - minimizes standby power loss in always-on subsystems like real-time clocks or wake-up circuits. |
| PSRR | 64 dB at 1 kHz with 10 nF BYP capacitor - suppresses switching noise from DC-DC converters feeding the LDO input. |
| Enable Threshold | VEN(HI) = 1.6 V min over temperature - compatible with 1.8 V GPIOs and open-drain logic without level shifting. |
| Thermal Shutdown | 160 °C with 10 °C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
The CAT6218-285TDGT3 is housed in a RoHS-compliant, lead-free TSOT-23-5 package (Case 419AE), measuring 2.90 mm × 1.60 mm × 1.00 mm max height, with NiPdAu plating for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.3 V–5.5 V; requires local 1 µF ceramic bypass to GND for stability and EMI filtering. |
| GND | Power ground reference | Must connect directly to low-impedance PCB ground plane; shared return for VIN, VOUT, BYP, and EN. |
| EN | Active-high enable control | Pulled down internally with 2.5 MΩ; drives high (>1.6 V) to activate regulator; open-circuit defaults to OFF. |
| BYP | Reference bypass node | Connects optional 10 nF capacitor to GND to lower output noise and boost PSRR above 10 kHz. |
| VOUT | Regulated output terminal | Delivers 2.85 V ±1% with ≤1.2% load regulation (100 µA–300 mA); stable with 1–4.7 µF ceramic COUT (5–500 mΩ ESR). |
Key Features
| Feature | Design Value |
|---|---|
| Quick-start with external BYP capacitor | Enables 150 µs turn-on while maintaining ultra-low noise - critical for wake-from-sleep sequences in wearables. |
| Zero shutdown current | 1 µA max shutdown ground current - eliminates battery drain during deep sleep modes in IoT endpoints. |
| Fold-back current limit | Reduces short-circuit current to ~180 mA - prevents thermal runaway and allows safe recovery after fault clearance. |
| Stable with minimal output capacitance | Guaranteed stability using only 1 µF ceramic capacitor - reduces BOM cost and board area vs. electrolytic alternatives. |
| Under-voltage lockout (UVLO) | Disables output below 2.1 V typical - avoids brown-out operation and erratic behavior in fading battery conditions. |
Applications
| Smartphone Baseband Power | Wireless Headset Audio Bias |
|---|---|
|
Use Scenario: Supplying clean 2.85 V bias to cellular baseband processors during burst transmission. IC Role / Device Role / Timing Role: Primary LDO delivering regulated core voltage with fast line/load transient response. Use Value: 180 mV dropout extends usable battery range; 64 dB PSRR rejects noise from adjacent RF power amplifiers. |
Use Scenario: Powering MEMS microphones and Class AB headphone drivers in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled via BYP pin for signal integrity. Use Value: 45 µVRMS output noise and 1% accuracy preserve SNR in audio signal chains without additional filtering. |
| Medical Sensor Node | Industrial Handheld Scanner |
|
Use Scenario: Regulating power for optical pulse oximetry sensor front-end and ADC in wearable health monitors. IC Role / Device Role / Timing Role: Precision analog supply with thermal protection for continuous operation. Use Value: ±1.0% initial accuracy ensures consistent sensor calibration; 125 °C max junction temp supports body-worn thermal profiles. |
Use Scenario: Providing stable 2.85 V to barcode image sensor and laser driver in ruggedized handheld scanners. IC Role / Device Role / Timing Role: Robust main supply with fold-back current limit and UVLO for intermittent high-current pulses. Use Value: 300 mA capability handles peak sensor readout loads; 250 Ω shutdown discharge prevents residual voltage hold-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-285E/TT | 250 mA max output, 6 µA quiescent current, no BYP pin, 200 mV dropout at 250 mA | Lacks noise-reduction bypass capability; lower current rating limits use in higher-power peripherals | Prefer CAT6218-285TDGT3 when >250 mA load or <45 µVRMS noise is required |
| Torex XC6206P282MR-G | 150 mA max output, 1 µA shutdown current, no enable pin, 250 mV dropout at 150 mA | No EN control or thermal shutdown; unsuitable for active power sequencing or thermally constrained designs | Prefer CAT6218-285TDGT3 when system-level enable control, 300 mA delivery, or thermal safety is mandatory |
Compared with MCP1700T-285E/TT and XC6206P282MR-G, the CAT6218-285TDGT3 uniquely combines 300 mA output, integrated EN logic, BYP-based noise suppression, and thermal/UVLO protection - making it optimal for compact, battery-powered systems demanding both performance headroom and functional safety.
Availability
CAT6218-285TDGT3 is available at Aetrix Electronics and suitable for smartphone baseband power, wireless headset audio bias, medical sensor nodes, and industrial handheld scanners requiring stable component supply across production lifecycles.
Supply support for CAT6218-285TDGT3 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent edge applications.
The CAT6218 series is part of onsemi's precision analog power management portfolio, designed specifically for ultra-low-power, noise-sensitive portable electronics requiring high accuracy, fast transient response, and minimal board footprint.
FAQ
What is the maximum input voltage rating for CAT6218-285TDGT3?
The CAT6218-285TDGT3 has an absolute maximum input voltage of 6.5 V. However, its recommended operating input range is 2.3 V to 5.5 V. Exceeding 5.5 V may trigger internal protection or degrade reliability. Always ensure VIN stays within this range during normal operation and transient events to maintain long-term performance of the CAT6218-285TDGT3.
Does CAT6218-285TDGT3 require an external bypass capacitor for basic operation?
No - the CAT6218-285TDGT3 operates stably without the BYP capacitor. The 10 nF capacitor on the BYP pin is optional and used only to reduce output noise and improve PSRR. Basic regulation, startup, and load response are fully functional with just VIN, VOUT, and GND capacitors. The CAT6218-285TDGT3 achieves 45 µVRMS noise only when the BYP capacitor is installed.
What is the thermal shutdown behavior of CAT6218-285TDGT3?
The CAT6218-285TDGT3 activates thermal shutdown at 160 °C junction temperature and remains off until temperature drops by ~10 °C (hysteresis). During shutdown, the output is disabled and the internal 250 Ω switch discharges the output capacitor. This protects the CAT6218-285TDGT3 and downstream circuitry during sustained overload or inadequate PCB copper area.
Can CAT6218-285TDGT3 be used with ceramic output capacitors below 1 µF?
No - the CAT6218-285TDGT3 is specified and tested for stability with ≥1 µF ceramic output capacitance (ESR 5–500 mΩ). Using smaller values risks oscillation or poor transient response. The 1 µF minimum is a design requirement, not a recommendation; deviating invalidates the guaranteed performance specs of the CAT6218-285TDGT3.
Is CAT6218-285TDGT3 pin-compatible with other variants in the CAT6218 family?
Yes - all CAT6218 variants, including CAT6218-285TDGT3, share identical TSOT-23-5 pinout, electrical interface, and functional block diagram. Only the output voltage differs (e.g., 2.70 V, 3.00 V, 3.30 V). This allows drop-in replacement across voltage options without PCB layout changes, provided input/output capacitor values and load requirements remain compatible with the new VOUT.
CAT6218-285TDGT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 64dB ~ 54dB (1kHz ~ 20kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
CAT6218-285TDGT3 FAQ
1.How can I place an order for CAT6218-285TDGT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT6218-285TDGT3 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 CAT6218-285TDGT3 reliable?
The price and inventory of CAT6218-285TDGT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT6218-285TDGT3 is usually 5 days.
3.What payment methods are accepted for CAT6218-285TDGT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT6218-285TDGT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT6218-285TDGT3?
CAT6218-285TDGT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT6218-285TDGT3 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 CAT6218-285TDGT3?
For technical support, including CAT6218-285TDGT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT6218-285TDGT3 requirements.
6.How does Aetrix verify that CAT6218-285TDGT3 is sourced from the original manufacturer or authorized distributors?
All CAT6218-285TDGT3 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 CAT6218-285TDGT3 meets industry standards.
7.What is the process for return or replacement of CAT6218-285TDGT3?
All CAT6218-285TDGT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT6218-285TDGT3, 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 CAT6218-285TDGT3 part is unused and in its original packaging.
Return procedure for CAT6218-285TDGT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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