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onsemi CAT6218-280TDGT3
- Part No.:
- CAT6218-280TDGT3
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT6218-280TDGT3.pdf
- Description:
- IC REG LIN 2.8V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
CAT6218-280TDGT3 from onsemi is a 2.80 V, 300 mA CMOS low-dropout linear regulator in a TSOT-23-5 package, designed for battery-powered systems requiring fast load/line transient response, low noise (45 µVRMS), and ultra-low ground current (55 µA typical at no load). It delivers ±1.0% initial output accuracy and operates across 2.3 V to 5.5 V input with 180 mV typical dropout at full load - enabling stable 2.80 V rail generation from single-cell Li-ion or dual-cell alkaline sources in portable audio and sensor modules.
For engineers reviewing the CAT6218-280TDGT3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 300 mA output with fold-back current limiting, quick-start capability using a 10 nF BYP capacitor, thermal shutdown at 160°C, and compatibility with 1 µF ceramic output capacitors - all critical for space-constrained, low-power embedded designs.
Technical Context
The CAT6218-280TDGT3 integrates a CMOS pass transistor with internal voltage reference, precision error amplifier, and enable-controlled shutdown switch. Its architecture supports fast transient recovery (<10 µs typical) via high-gain feedback and low-output-impedance regulation, while the dedicated BYP pin enables external 10 nF capacitor connection to suppress high-frequency noise and improve PSRR by up to 10 dB at 20 kHz.
Operation is conditioned by an internal under-voltage lockout (UVLO) that disables output below 2.1 V (typical), and thermal protection that activates at 160°C with 10°C hysteresis. The EN pin features a built-in 2.5 MΩ pull-down resistor, ensuring default-off behavior when left floating - eliminating need for external biasing in battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.80 V ±1.0% initial accuracy - ensures precise biasing for 2.8 V logic rails and analog sensors without external trimming. |
| Max Output Current | 300 mA guaranteed - supports moderate-power microcontrollers, RF transceivers, or display drivers without thermal derating in ambient ≤85°C. |
| Dropout Voltage | 180 mV typical at 300 mA - allows operation down to 2.98 V input, enabling use with partially discharged 3.0 V batteries. |
| Ground Current | 55 µA typical at no load - minimizes quiescent drain in always-on monitoring circuits, extending shelf life of coin-cell devices. |
| PSRR @ 1 kHz | 64 dB with 10 nF BYP capacitor - suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Turn-On Time | 150 µs with 10 nF BYP - enables rapid power sequencing in multi-rail systems without compromising startup timing budgets. |
| Thermal Shutdown | 160°C with 10°C hysteresis - provides self-protecting operation during sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 1 mm max height, RoHS-compliant NiPdAu finish, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.3–5.5 V; requires local 1 µF ceramic bypass to GND for stability and EMI suppression. |
| GND | Power ground reference | Must connect directly to low-impedance PCB ground plane to maintain accuracy and thermal performance. |
| EN | Active-high enable control | Internal 2.5 MΩ pull-down ensures safe default-off state; logic high ≥1.6 V (over temp) activates regulator. |
| BYP | Reference bypass node | Connects optional 10 nF capacitor to GND to reduce output noise and enhance PSRR above 10 kHz. |
| VOUT | Regulated output terminal | Delivers 2.80 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 low-noise performance - eliminates trade-off between speed and ripple in wake-up-critical systems. |
| Fold-back current limit | Reduces short-circuit power dissipation to ~180 mA limit, preventing thermal runaway during output faults without external circuitry. |
| Zero shutdown current | Draws <1 µA in EN = low state - essential for long-term storage mode in IoT edge nodes and wearable health monitors. |
| Stable with 1 µF ceramic output cap | Eliminates need for larger, higher-ESR tantalum or aluminum electrolytic capacitors - reduces BOM cost and board area by >50%. |
| ±2.0% accuracy over −40°C to +125°C | Ensures reliable operation across automotive cabin, industrial sensor, and outdoor consumer environments without calibration. |
Applications
| Wireless Headset Audio Supply | IoT Sensor Node Core Rail |
|---|---|
|
Use Scenario: Powers DAC, op-amps, and Bluetooth LE radio in compact wireless earbuds with single 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Provides clean, low-noise 2.80 V analog supply isolated from noisy digital switching domains. Use Value: 45 µVRMS output noise and 64 dB PSRR prevent audible hiss and RF desense - meeting Bluetooth SIG audio quality requirements. |
Use Scenario: Supplies MCU, temperature/humidity sensor, and sub-GHz transceiver in battery-operated environmental monitor. IC Role / Device Role / Timing Role: Delivers stable 2.80 V core voltage with <55 µA quiescent current during deep-sleep cycles. Use Value: Enables >5-year battery life on CR2032 via zero-shutdown current and fast wake-up (150 µs), reducing system-level power management complexity. |
| Portable Medical Pulse Oximeter | Smart Home Motion Detector |
|
Use Scenario: Powers photodiode amplifier chain and ADC in handheld pulse oximeters operating from AAA batteries. IC Role / Device Role / Timing Role: Regulates 2.80 V analog front-end supply with ±1% accuracy to ensure consistent LED drive and signal gain calibration. Use Value: 180 mV dropout allows continuous operation until battery reaches 2.98 V - maximizing usable capacity from alkaline cells. |
Use Scenario: Supplies PIR sensor IC, microcontroller, and Zigbee module in wall-mounted occupancy sensors. IC Role / Device Role / Timing Role: Acts as primary voltage source during motion-triggered active mode, with thermal protection preventing latch-up in enclosed enclosures. Use Value: Thermal shutdown at 160°C and fold-back current limit eliminate need for external thermal fusing or current sense resistors - simplifying Class II safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6218B280MR-G | Same 2.80 V output, 300 mA rating, and TSOT-23-5 package; ±2% initial accuracy vs. CAT6218-280TDGT3's ±1%. | Lacks dedicated BYP pin - PSRR degrades above 10 kHz without external compensation network. | Preferred where cost sensitivity outweighs high-frequency noise rejection needs. |
| Diodes Inc. AP2204K-2.8TRG1 | 2.8 V output, 300 mA, SOT-23-5; higher 250 mV dropout at 300 mA and 120 µA no-load ground current. | No UVLO or thermal shutdown - requires external supervision circuitry for battery protection. | Suitable for non-critical, fixed-input industrial controls where thermal margin is ample. |
Compared with XC6218B280MR-G and AP2204K-2.8TRG1, the CAT6218-280TDGT3 offers superior initial accuracy, integrated noise-reduction capability via BYP pin, and complete fault protection (UVLO + thermal + fold-back), making it optimal for portable medical and premium audio applications demanding reliability and signal integrity.
Availability
CAT6218-280TDGT3 is available at Aetrix Electronics and suitable for wireless audio subsystems, battery-powered IoT sensors, portable medical diagnostics, and smart home motion detectors requiring stable component supply and long-lifecycle support.
Supply support for CAT6218-280TDGT3 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 power solutions.
The CAT6218 series is part of onsemi's precision analog portfolio, engineered specifically for ultra-low-power, noise-sensitive portable electronics where small size, fast transient response, and high accuracy are mandatory.
FAQ
What is the minimum input voltage required for stable operation of the CAT6218-280TDGT3?
The CAT6218-280TDGT3 requires a minimum input voltage of 2.98 V to maintain regulated 2.80 V output at 300 mA load, based on its 180 mV typical dropout voltage. Below 2.98 V, output voltage drops linearly with input; operation is guaranteed only above 2.3 V input, but regulation ceases below the dropout threshold. For battery applications, this allows full utilization of Li-ion cells down to ~2.95 V before brownout.
Does the CAT6218-280TDGT3 require an external bypass capacitor for basic functionality?
No - the CAT6218-280TDGT3 operates stably without the external 10 nF BYP capacitor. That capacitor is optional and used solely to reduce output noise (from 45 µVRMS to lower levels) and improve PSRR above 10 kHz. Omitting it does not affect regulation accuracy, dropout, or thermal performance - only high-frequency noise immunity.
Can the CAT6218-280TDGT3 be used with ceramic output capacitors smaller than 1 µF?
No - the CAT6218-280TDGT3 is specified and tested for stability only with 1 µF to 4.7 µF ceramic output capacitors having 5–500 mΩ ESR. Using capacitors below 1 µF risks oscillation or poor transient response, as confirmed in the datasheet's stability section and Figure 22 load transient plots. Minimum 1 µF is a hard design requirement.
What happens to the output when the EN pin is left unconnected?
When the EN pin is left unconnected, the internal 2.5 MΩ pull-down resistor forces it to logic low, disabling the CAT6218-280TDGT3 output. The device enters zero-current shutdown mode (<1 µA supply current), and VOUT is actively discharged via a 250 Ω internal switch. This fail-safe behavior prevents unintended power-up and is explicitly validated in the datasheet's EN pin description and Figure 18 turn-off waveform.
Is the CAT6218-280TDGT3 compatible with lead-free reflow soldering profiles?
Yes - the CAT6218-280TDGT3 uses NiPdAu lead finish and is rated for standard lead-free reflow per JEDEC J-STD-020. Its maximum soldering temperature is 260°C for 5 seconds, matching IPC/JEDEC Class 3 requirements. The TSOT-23-5 package has been qualified for both SnPb and Pb-free assembly processes, with no special pre-bake or moisture sensitivity level (MSL) handling required beyond standard MSL1 conditions.
CAT6218-280TDGT3 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):
- 2.8V
- 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
CAT6218-280TDGT3 FAQ
1.How can I place an order for CAT6218-280TDGT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT6218-280TDGT3 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 CAT6218-280TDGT3 reliable?
The price and inventory of CAT6218-280TDGT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT6218-280TDGT3 is usually 5 days.
3.What payment methods are accepted for CAT6218-280TDGT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT6218-280TDGT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT6218-280TDGT3?
CAT6218-280TDGT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT6218-280TDGT3 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 CAT6218-280TDGT3?
For technical support, including CAT6218-280TDGT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT6218-280TDGT3 requirements.
6.How does Aetrix verify that CAT6218-280TDGT3 is sourced from the original manufacturer or authorized distributors?
All CAT6218-280TDGT3 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 CAT6218-280TDGT3 meets industry standards.
7.What is the process for return or replacement of CAT6218-280TDGT3?
All CAT6218-280TDGT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT6218-280TDGT3, 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 CAT6218-280TDGT3 part is unused and in its original packaging.
Return procedure for CAT6218-280TDGT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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