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Texas Instruments TPS79501DCQ
- Part No.:
- TPS79501DCQ
- Manufacturer:
- Texas Instruments
- Package:
- SOT-223-6
- Datasheet:
-
TPS79501DCQ.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:10,412
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Product details
Overview
TPS79501DCQ from Texas Instruments is a 500mA ultra-low-noise, high-PSRR low-dropout linear regulator in 6-pin SOT-223 package, delivering 1.225V fixed output with ±2% accuracy over load (0–500mA) and temperature (–40°C to +125°C), 110mV typical dropout at full load, and stable operation with only 1µF ceramic output capacitor. It serves precision analog and RF power rails in noise-sensitive systems such as TV tuners and home theater audio stages.
For engineers reviewing the TPS79501DCQ datasheet, TPS79501DCQ pinout, TPS79501DCQ application, or TPS79501DCQ equivalent, this page provides verified electrical specifications, thermal performance data, noise-reduction pin functionality, enable logic thresholds, and validated alternative LDOs for RF-grade power delivery where PSRR >50dB at 10kHz and output noise <80µVRMS (10Hz–100kHz) are required.
Technical Context
The TPS79501DCQ employs a PMOS pass transistor architecture with high-gain error amplifier enabling fast line/load transient response and high PSRR even at low headroom (VIN – VOUT). Its internal 1.225V bandgap reference feeds a precision feedback loop, and the NR/FB pin supports external noise-reduction capacitor bypassing for fixed-output variants.
It integrates undervoltage lockout (UVLO) with 1.28V–1.62V rising threshold and 130mV hysteresis, thermal shutdown at 170°C (shutdown) / 155°C (reset), and hybrid brick-wall/foldback current limiting (ICL = 1.04A typ, ISC = 550mA typ) - all optimized for robust operation in compact, thermally constrained RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225V ±2% (0–500mA, –40°C to +125°C); enables precise biasing of RF ICs and ADC references. |
| Dropout Voltage | 110mV typical at 500mA; allows regulation from 1.335V input, critical for battery-powered 1.8V/1.5V system rails. |
| PSRR | 50dB at 10kHz (IOUT = 500mA, new chip); suppresses switching noise from upstream DC/DC converters in mixed-signal SoC supplies. |
| Output Noise | 78µVRMS (10Hz–100kHz, IOUT = 500mA, new chip); meets stringent spectral purity requirements for PLL/VCO power domains. |
| Stability | Stable with ≥1µF ceramic COUT (min effective 0.47µF); eliminates need for tantalum or large bulk capacitors in space-constrained layouts. |
| Enable Threshold | VEN(HI) = 0.85VIN min (new chip); compatible with 1.8V GPIO control without level-shifting in modern microcontrollers. |
| Thermal Shutdown | Triggers at 170°C junction, resets at 155°C; protects against sustained overload in sealed enclosures with limited airflow. |
Pinout & Package
TPS79501DCQ uses the 6-pin SOT-223 package (6.5mm × 7.06mm), with exposed thermal pad internally connected to GND. Pin 1 is EN, Pin 2 is IN, Pin 3 is GND, Pin 4 is OUT, Pin 5 is NC/FB, and Pin 6 is OUT (dual-output configuration for thermal spreading).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Active-high enable input | Drives regulator ON when ≥0.85×VIN; ties directly to IN if always enabled - no external pull-up needed. |
| IN (Pin 2) | Main power input | Accepts 2.7V–6.0V supply; requires ≥2.2µF ceramic input capacitor for stability under dynamic load. |
| GND (Pin 3) | Regulator ground reference | Common return path for IN, OUT, and thermal pad; must connect thermal pad to large PCB ground plane for RθJB = 8.5°C/W. |
| OUT (Pins 4 & 6) | Regulated output terminals | Dual OUT pins reduce trace resistance and improve current sharing; both deliver identical 1.225V output. |
| NC/FB (Pin 5) | No-connect / feedback input | NC for fixed-output TPS79501; not connected internally - leave unpopulated or float (no pull-up/down required). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 78µVRMS (10Hz–100kHz) enables clean power for RF synthesizers and high-resolution ADCs without additional filtering. |
| High PSRR at RF frequencies | 50dB @ 10kHz ensures >99% rejection of 10kHz ripple from buck converter switching harmonics in shared power domains. |
| Fast transient response | Sub-100µs load step recovery (500mA → 0mA) maintains voltage regulation during burst-mode digital processor activity. |
| Low-quiescent current | 500–900µA ground current (0–500mA load) minimizes standby power loss in always-on audio subsystems. |
| Integrated UVLO & thermal protection | 1.28V UVLO start threshold prevents erratic startup during brownout; 170°C thermal shutdown avoids permanent damage during solder reflow or sustained overload. |
Applications
| TV Tuner Modules | Home Theater Audio DACs |
|---|---|
Use Scenario: Powering RF front-end LNAs and mixers in digital terrestrial TV receivers operating in noisy EMI environments. IC Role / Device Role / Timing Role: Low-noise LDO supplying clean 1.225V bias to RF signal chain components downstream of broadband switch-mode power supplies. Use Value: 78µVRMS noise and 50dB PSRR at 10kHz prevent reciprocal mixing and SNR degradation in sub-GHz tuner IF stages. | Use Scenario: Regulating analog supply for stereo 24-bit/192kHz DACs in AV receivers and soundbars. IC Role / Device Role / Timing Role: Fixed-output LDO delivering ultra-stable 1.225V reference rail isolated from digital switching noise on shared PCB layers. Use Value: ±2% output accuracy over temperature and 110mV dropout ensure consistent DAC full-scale output across ambient conditions without derating. |
| Building Automation Sensors | Connected Peripheral USB Hubs |
Use Scenario: Powering low-power Zigbee/Thread wireless transceivers and precision temperature/humidity sensors in smart thermostats. IC Role / Device Role / Timing Role: Enable-controlled LDO providing regulated 1.225V to RF ICs during active transmission bursts, then entering shutdown to conserve battery. Use Value: 0.07–1µA shutdown current extends coin-cell life; fast 550µs startup ensures timely response to occupancy-triggered sensor reads. | Use Scenario: Supplying auxiliary 1.2V logic rails for USB 3.0 hub controllers and PHYs in multi-port docking stations. IC Role / Device Role / Timing Role: High-PSRR LDO decoupling USB controller core voltage from noisy 5V bus-derived switching regulators. Use Value: Dual OUT pins reduce IR drop and thermal stress under 500mA peak load during USB device enumeration and high-speed data transfer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A90DRBR | Lower 4.5µVRMS noise (10Hz–100kHz), 1.2V–5.5V adjustable output, 3mm × 3mm VSON-8 package. | Requires external resistors for feedback; better suited for designs needing programmable output or tighter noise specs. | Select TPS7A90DRBR when <5µVRMS noise is mandatory and board space allows VSON-8 footprint. |
| LP5907MFX-1.2/NOPB | 250mA rating, 13µVRMS noise, 1.2V fixed, SOT-23-5 package; no enable or NR pin. | Limited to lower-current analog blocks; lacks enable control and noise-reduction capability for RF use cases. | Choose LP5907MFX-1.2/NOPB only for cost-sensitive, low-power sensor nodes where 500mA capability is unnecessary. |
Compared with TPS7A90DRBR and LP5907MFX-1.2/NOPB, the TPS79501DCQ uniquely balances 500mA output, 78µVRMS noise, integrated enable, and SOT-223 thermal performance - making it optimal for mid-power RF/analog systems requiring proven reliability and minimal BOM count.
Availability
TPS79501DCQ is available at Aetrix Electronics and suitable for TV tuner modules, home theater audio DACs, building automation sensors, and connected peripheral USB hubs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TPS79501DCQ 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of LDO design expertise for mission-critical power management.
The TPS795 product line targets RF and precision analog applications demanding ultra-low noise, high PSRR, and fast transient response - specifically engineered for noise-sensitive signal chains in consumer, industrial, and communications equipment.
FAQ
What is the maximum input voltage rating for the TPS79501DCQ?
The TPS79501DCQ has an absolute maximum input voltage of 6.5V for the new chip revision. Operating above 6.0V violates recommended conditions and risks permanent damage. For continuous operation, TI specifies 2.7V to 6.0V input range - sufficient to support 5V bus-derived rails with margin for ripple and tolerance.
Does the TPS79501DCQ require an external noise-reduction capacitor?
No - the TPS79501DCQ is a fixed-output variant and does not include a functional NR pin; Pin 5 is NC/FB and must remain unconnected. Unlike adjustable versions, it delivers 78µVRMS noise without external CNR, simplifying layout and reducing BOM count while maintaining RF-grade spectral purity.
How does the TPS79501DCQ behave during thermal shutdown?
When junction temperature reaches 170°C, the TPS79501DCQ disables output and enters thermal shutdown. It remains off until temperature falls to 155°C, then automatically resumes regulation. This hysteresis prevents oscillation during marginal thermal conditions and protects the device during sustained overload or poor heatsinking.
Can the TPS79501DCQ be used with a 1µF ceramic output capacitor?
Yes - the TPS79501DCQ is explicitly characterized for stability with ≥1µF ceramic output capacitors (minimum effective capacitance 0.47µF). This eliminates need for larger electrolytic or tantalum caps, enabling compact, high-reliability designs in space-constrained RF modules and portable audio devices.
What is the enable pin logic compatibility of the TPS79501DCQ?
The TPS79501DCQ EN pin is active-high with VEN(HI) ≥ 0.85×VIN (new chip), making it directly compatible with 1.8V, 2.5V, and 3.3V GPIOs without level shifters. When unused, EN may be tied to IN - ensuring default-on operation with zero external components.
TPS79501DCQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-223-6
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 385 µA
- Current - Supply (Max):
- -
- PSRR:
- 59dB ~ 39dB (100Hz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-6
TPS79501DCQ FAQ
1.How can I place an order for TPS79501DCQ through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS79501DCQ 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 TPS79501DCQ reliable?
The price and inventory of TPS79501DCQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS79501DCQ is usually 5 days.
3.What payment methods are accepted for TPS79501DCQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS79501DCQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS79501DCQ?
TPS79501DCQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS79501DCQ 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 TPS79501DCQ?
For technical support, including TPS79501DCQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS79501DCQ requirements.
6.How does Aetrix verify that TPS79501DCQ is sourced from the original manufacturer or authorized distributors?
All TPS79501DCQ 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 TPS79501DCQ meets industry standards.
7.What is the process for return or replacement of TPS79501DCQ?
All TPS79501DCQ units undergo pre-shipment inspection (PSI). If there is an issue with TPS79501DCQ, 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 TPS79501DCQ part is unused and in its original packaging.
Return procedure for TPS79501DCQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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