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onsemi CAT6219-180TDGT3
- Part No.:
- CAT6219-180TDGT3
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
CAT6219-180TDGT3.pdf
- Description:
- IC REG LDO 1.8V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,117
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Product details
Overview
CAT6219-180TDGT3 from onsemi is a fixed-output 1.80 V, 500 mA CMOS low-dropout (LDO) regulator in TSOT-23-5 package, featuring 300 mV typical dropout at full load, ±1.0% initial output accuracy, and fast 150 µs turn-on time with external 10 nF bypass capacitor. It operates from 2.3 V to 5.5 V input and delivers ultra-low ground current (55 µA typical at no load), making it ideal for space-constrained, battery-powered portable electronics requiring stable low-noise voltage regulation.
For engineers reviewing the CAT6219-180TDGT3 datasheet, pinout, applications, or equivalent options, key selection considerations include its guaranteed 500 mA output capability under 2.3–5.5 V input, thermal shutdown and foldback current limiting, compatibility with small ceramic output capacitors (2.2 µF), and zero shutdown current - all critical for power-sensitive embedded systems and mobile device power rails.
Technical Context
The CAT6219-180TDGT3 implements a CMOS-based LDO architecture with internal reference and error amplifier, enabling high PSRR (64 dB at 1 kHz with 10 nF BYP capacitor) and tight line/load regulation (±0.1%/V and ±1.5% over 100 µA–500 mA). Its enable input features an integrated 2.5 MΩ pull-down resistor, ensuring default-off behavior when left floating.
Under-voltage lockout disables regulation below 2.15 V (typical), while thermal protection activates at 160 °C with 10 °C hysteresis. The device supports stable operation with only a 2.2 µF ceramic output capacitor and requires no external compensation - simplifying layout and reducing BOM count in compact designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.80 V ±1.0% initial accuracy ensures precise rail generation for 1.8 V logic and memory interfaces. |
| Max Output Current | 500 mA continuous output supports moderate-power subsystems like RF front-ends or sensor hubs without derating. |
| Dropout Voltage | 300 mV typical at 500 mA enables operation down to 2.1 V input - critical for single-cell Li-ion or Li-poly battery discharge tails. |
| Ground Current | 55 µA typical at no load minimizes quiescent power loss, extending battery life in standby modes. |
| PSRR | 64 dB at 1 kHz (with 10 nF BYP cap) suppresses switching noise from upstream DC-DC converters feeding the LDO. |
| Turn-On Time | 150 µs with 10 nF bypass capacitor enables rapid power sequencing in multi-rail systems. |
| Operating Input Range | 2.3 V to 5.5 V input accommodates wide battery chemistries and intermediate supply rails. |
Pinout & Package
Package: TSOT-23-5 (Case 419AE), 1 mm max height, RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply pin | Accepts 2.3–5.5 V; requires 1 µF ceramic bypass capacitor near pin to stabilize input impedance. |
| GND | Ground reference | Must connect directly to PCB ground plane; serves as return path for all internal currents including BYP and EN. |
| EN | Enable control (active-high) | Logic high ≥1.6 V enables output; internal 2.5 MΩ pull-down ensures safe default-off state if unconnected. |
| BYP/ADJ | Bypass input (fixed version) | Connects to 10 nF capacitor to ground to reduce output noise and improve high-frequency PSRR - no effect on startup timing. |
| VOUT | Regulated output | Delivers 1.80 V ±1% to load; requires 2.2 µF ceramic capacitor placed adjacent to pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-start bypass architecture | Enables 150 µs turn-on while maintaining low-noise performance via optional 10 nF capacitor - decouples speed and noise optimization. |
| Zero shutdown current | 1 µA max shutdown ground current eliminates leakage drain during system sleep - essential for multi-week battery shelf life. |
| Thermal + current protection | Foldback current limit and 160 °C thermal shutdown prevent damage during overload or poor heatsinking in confined enclosures. |
| Ultra-low-noise operation | 45 µVrms output noise (10 Hz–100 kHz) meets stringent analog/RF supply requirements without additional filtering. |
| UVLO with hysteresis | 2.15 V UVLO threshold prevents erratic regulation during brown-out conditions; no external components needed. |
Applications
| Smartphone Baseband Power | Wearable Sensor Hub |
|---|---|
Use Scenario: Powers baseband processor core voltage rail in LTE/5G smartphones operating from single-cell Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary 1.8 V LDO delivering clean, regulated power to digital baseband IC with fast load transient response. Use Value: 300 mV dropout extends usable battery runtime by >15 minutes at end-of-discharge; 45 µVrms noise prevents bit errors in high-speed serial interfaces. | Use Scenario: Supplies 1.8 V to MEMS accelerometer, gyroscope, and BLE SoC in compact fitness trackers. IC Role / Device Role / Timing Role: Low-quiescent, always-on LDO powering sensor fusion subsystem during motion detection sleep cycles. Use Value: 55 µA no-load ground current enables >30-day battery life in intermittent-sensing mode; TSOT-23-5 footprint fits sub-100 mm² PCB area. |
| Portable Medical Monitor | IoT Edge Node MCU |
Use Scenario: Provides stable 1.8 V supply to ADC and microcontroller in handheld ECG/SpO₂ devices powered by coin-cell or rechargeable Li-poly. IC Role / Device Role / Timing Role: Precision LDO ensuring accurate analog signal chain biasing and digital logic integrity across temperature and battery voltage range. Use Value: ±1.0% initial accuracy and ±2.0% over temperature guarantee consistent ADC reference scaling; UVLO prevents malfunction below safe operating voltage. | Use Scenario: Regulates 1.8 V rail for ARM Cortex-M4/M33 MCU and wireless transceiver in battery-operated industrial IoT nodes. IC Role / Device Role / Timing Role: System-level power management IC enabling rapid wake-from-sleep transitions and low-duty-cycle operation. Use Value: 150 µs turn-on time synchronizes cleanly with MCU clock startup; thermal protection safeguards against enclosure overheating during extended transmit bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | 250 mA max output, higher 600 mV dropout at full load, no BYP pin or quick-start feature. | Limited to lower-current peripherals; unsuitable for 500 mA loads or noise-sensitive RF sections. | Select only for cost-sensitive, low-power applications where 250 mA suffices and noise/PSRR are non-critical. |
| Torex XC6206P182MR-G | 150 mA output, 350 mV dropout, no enable or thermal shutdown, SOT-23-3 package (no EN/BYP pins). | Minimalist solution for simple always-on rails; lacks protection and control features required for complex systems. | Use only in ultra-low-cost, non-safety-critical consumer gadgets with fixed 1.8 V needs and <150 mA load. |
Compared with MCP1700-1802E/TO and XC6206P182MR-G, the CAT6219-180TDGT3 provides 2× higher output current, 30% lower dropout, integrated enable and thermal protection, and dedicated noise-reduction capability - making it the only option among the three suitable for demanding portable electronics with dynamic load profiles and strict noise budgets.
Availability
CAT6219-180TDGT3 is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor subsystems, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CAT6219-180TDGT3 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 systems.
The CAT6219 series belongs to onsemi's precision analog LDO portfolio, designed specifically for battery-powered portable electronics requiring high accuracy, ultra-low quiescent current, and robust protection in miniature packages.
FAQ
What is the maximum input voltage rating for CAT6219-180TDGT3?
The CAT6219-180TDGT3 has an absolute maximum input voltage of 6.5 V, but its recommended operating input range is strictly 2.3 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or unpredictable behavior, even briefly. The device includes internal protection, but sustained operation above 5.5 V voids reliability guarantees and violates the datasheet's Recommended Operating Conditions. Always verify input source tolerance and transient spikes in your design before deploying CAT6219-180TDGT3.
Does CAT6219-180TDGT3 require an external bypass capacitor for basic operation?
No, CAT6219-180TDGT3 does not require an external bypass capacitor for basic regulation - it functions correctly with only VIN, GND, EN, and VOUT connections. However, the BYP pin must be connected to ground (or left open, as it has no internal connection in fixed-output variants) unless a 10 nF capacitor is added to improve PSRR and reduce output noise. The 10 nF capacitor is optional but strongly recommended for noise-sensitive applications like RF or precision analog circuits powered by CAT6219-180TDGT3.
What is the thermal shutdown threshold and hysteresis of CAT6219-180TDGT3?
The CAT6219-180TDGT3 activates thermal shutdown at a junction temperature of 160 °C (typical), with 10 °C hysteresis - meaning the device resumes normal operation only after cooling to approximately 150 °C. This protection is fully internal and requires no external components. In the TSOT-23-5 package, thermal resistance θJA is 235 °C/W, so continuous 500 mA operation at high ambient temperatures or poor PCB copper area can trigger shutdown; proper layout with thermal vias is advised when using CAT6219-180TDGT3 near its current limit.
Can CAT6219-180TDGT3 be used with ceramic output capacitors smaller than 2.2 µF?
No - the CAT6219-180TDGT3 is specified and characterized for stable operation only with a minimum 2.2 µF ceramic output capacitor (X5R/X7R, ≤500 mΩ ESR). Using smaller values (e.g., 1 µF) risks oscillation, poor transient response, or output overshoot during load steps. The datasheet explicitly states "Stable operation is provided with a small value ceramic capacitor" but defines that value as 2.2 µF in all test conditions and application circuits. Deviating from this requirement invalidates the stability guarantee for CAT6219-180TDGT3.
Is CAT6219-180TDGT3 pin-compatible with other output voltage variants in the same package?
Yes - all CAT6219 fixed-output variants (e.g., CAT6219-125TDGT3, CAT6219-250TDGT3, CAT6219-330TDGT3) share identical TSOT-23-5 pinout, package dimensions, and electrical interface. The only difference is the factory-trimmed output voltage; no PCB redesign is needed when swapping between 1.25 V, 1.80 V, 2.50 V, or 3.30 V versions. This allows flexible BOM management and last-minute voltage tuning without layout changes - a key advantage confirmed across the CAT6219 family datasheet ordering table for TDGT3 suffix parts.
CAT6219-180TDGT3 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 64dB ~ 54dB (1kHz ~ 20kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
CAT6219-180TDGT3 FAQ
1.How can I place an order for CAT6219-180TDGT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT6219-180TDGT3 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 CAT6219-180TDGT3 reliable?
The price and inventory of CAT6219-180TDGT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT6219-180TDGT3 is usually 5 days.
3.What payment methods are accepted for CAT6219-180TDGT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT6219-180TDGT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT6219-180TDGT3?
CAT6219-180TDGT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT6219-180TDGT3 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 CAT6219-180TDGT3?
For technical support, including CAT6219-180TDGT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT6219-180TDGT3 requirements.
6.How does Aetrix verify that CAT6219-180TDGT3 is sourced from the original manufacturer or authorized distributors?
All CAT6219-180TDGT3 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 CAT6219-180TDGT3 meets industry standards.
7.What is the process for return or replacement of CAT6219-180TDGT3?
All CAT6219-180TDGT3 units undergo pre-shipment inspection (PSI). If there is an issue with CAT6219-180TDGT3, 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 CAT6219-180TDGT3 part is unused and in its original packaging.
Return procedure for CAT6219-180TDGT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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