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Texas Instruments TPS79928DDCT
- Part No.:
- TPS79928DDCT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS79928DDCT.pdf
- Description:
- IC REG LINEAR 2.8V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:712
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Product details
Overview
TPS79928DDCT from Texas Instruments is a 200-mA, low-quiescent-current (40 μA), ultralow-noise (10.5 × VOUT μVRMS), high-PSRR (66 dB @ 1 kHz) low-dropout linear regulator in a 5-pin SOT-23-THIN package, delivering a fixed 2.8 V output with ±2% accuracy over –40°C to +125°C and 100 mV dropout at 200 mA - used for powering RF VCOs and precision analog circuitry in wearable electronics.
For engineers reviewing the TPS79928DDCT datasheet, TPS79928DDCT pinout, TPS79928DDCT application, or TPS79928DDCT equivalent, key selection criteria include its 2.8 V fixed output, 40 μA quiescent current, 100 mV dropout at full load, stability with ≥2 μF ceramic output capacitance, and noise-reduction (NR) pin support for sub-30 μVRMS output noise in sensitive RF supply rails.
Technical Context
The TPS79928DDCT employs a PMOS pass element and high-gain error amplifier to achieve ultralow dropout (100 mV @ 200 mA) and high PSRR (66 dB @ 1 kHz, 51 dB @ 10 kHz) even at low VIN–VOUT headroom. Its internal 1.193-V bandgap reference and feedback loop ensure ±2% total output accuracy across load, line, and temperature.
Inrush current protection activates immediately on EN toggle, clamping startup surge; an integrated overshoot detection circuit engages a pulldown resistor if VOUT exceeds nominal by >5%. The NR pin enables external 0.01-μF capacitor bypassing of bandgap noise, reducing total output noise to ~29.4 μVRMS (10.5 × 2.8 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.8 V - eliminates external feedback resistors and simplifies layout for dedicated rail generation. |
| Max output current | 200 mA - supports moderate-power RF ICs, sensors, and MCU cores without thermal derating in SOT-23-THIN. |
| Quiescent current | 40 μA typical - enables multi-year battery life in always-on wearable and IoT sensor nodes. |
| Dropout voltage | 100 mV @ 200 mA - allows operation from 2.9 V input when regulating 2.8 V, maximizing battery utilization. |
| PSRR | 66 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters feeding RF/analog sections. |
| Output noise | 10.5 × VOUT = 29.4 μVRMS (10 Hz–100 kHz, CNR = 0.01 μF) - meets stringent phase noise requirements of VCOs and ADC references. |
| Accuracy | ±2% over load (0.5–200 mA), line (2.7–6.5 V), and temperature (–40°C to +125°C) - ensures reliable logic-level compliance and analog signal integrity. |
| Stability | Guaranteed with ≥2 μF ceramic output capacitor (X5R/X7R, ESR < 1 Ω) - eliminates need for tantalum or polymer caps, reducing BOM cost and size. |
Pinout & Package
TPS79928DDCT is packaged in a 5-pin SOT-23-THIN (DDC) measuring 2.90 mm × 1.60 mm, with exposed pad not present - suitable for space-constrained portable PCBs and compatible with standard SOT-23 pick-and-place equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.7–6.5 V input; minimum VIN = VOUT + VDO = 2.9 V for full 200 mA capability. |
| 2 - GND | Power ground reference | Must be low-impedance connection to system ground plane; serves as return path for 40 μA quiescent and 200 mA load current. |
| 3 - EN | Enable control input | Active-high TTL/CMOS-compatible; drives high (>1.2 V) to enable, low (<0.4 V) to shut down (ISHDN = 0.15 μA). |
| 4 - NR | Noise reduction terminal | Connects to 0.01 μF capacitor to bypass bandgap noise; reduces output noise to 29.4 μVRMS and improves PSRR above 10 kHz. |
| 5 - OUT | Regulated output | Delivers stable 2.8 V; requires ≥2 μF ceramic capacitor to ground for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Inrush current protection | Immediate current limiting on EN toggle start-up prevents input rail sag and avoids overstressing source capacitors. |
| Overshoot detection & pulldown | Integrated circuit pulls output down via ~350 Ω resistor if VOUT exceeds 2.8 V by >5%, preventing damage to downstream 2.8 V logic. |
| Ultralow-noise architecture | Bandgap noise bypassed via NR pin; achieves 29.4 μVRMS (10 Hz–100 kHz), critical for VCO phase noise and ADC SNR. |
| High PSRR at low headroom | 66 dB @ 1 kHz with VIN–VOUT = 0.25 V - maintains clean supply rejection even during battery discharge near cutoff. |
| Thermal & current protection | Fully protected against overtemperature (165°C shutdown, 145°C reset) and overload (220–600 mA current limit). |
| Wide operating junction range | Specified from –40°C to +125°C - qualified for automotive cabin modules, industrial edge sensors, and outdoor wearables. |
Applications
| RF Power Amplifier Bias Supply | VCO Core Voltage Rail |
|---|---|
Use Scenario: Supplies clean 2.8 V bias to GaAs or SiGe PA stages in Bluetooth/WLAN front-ends where supply ripple directly modulates output spectrum. IC Role / Device Role / Timing Role: Low-noise LDO providing regulated, PSRR-filtered voltage to PA collector/drain node. Use Value: 66 dB PSRR at 1 kHz and 29.4 μVRMS noise prevent AM-to-PM conversion and adjacent-channel leakage. |
Use Scenario: Powers oscillator core in 2.4 GHz/5 GHz synthesizers where supply noise degrades phase noise floor and EVM. IC Role / Device Role / Timing Role: Fixed-output LDO delivering ultra-stable 2.8 V with minimal jitter contribution to VCO tuning port. Use Value: Sub-30 μVRMS output noise and 51 dB PSRR at 10 kHz suppress close-in phase noise (10–100 kHz offset). |
| Wearable Heart Rate Sensor Analog Front-End | Smartphone Camera Module ISP Core |
Use Scenario: Powers photodiode transimpedance amplifier and 24-bit sigma-delta ADC in optical PPG sensors requiring nanovolt-level signal integrity. IC Role / Device Role / Timing Role: Precision analog supply rail generator with ±2% accuracy and low thermal drift. Use Value: 2% total accuracy over temperature ensures consistent gain calibration; 40 μA IQ extends coin-cell lifetime beyond 2 years. |
Use Scenario: Supplies image signal processor (ISP) core logic and analog blocks in multi-camera smartphone modules with tight power sequencing. IC Role / Device Role / Timing Role: Fast-starting, enable-controlled 2.8 V rail supporting dynamic power gating during burst capture modes. Use Value: 50 μs start-up time with NR capacitor and EN toggle enables sub-100 ms camera wake-up; 0.15 μA shutdown current minimizes standby drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS799285DDCT | Identical pinout, package, and electrical specs; differs only in output tolerance (±1% vs ±2%) and tighter initial accuracy (±0.5% vs ±1%). | Preferred for metrology-grade analog systems where 1% absolute accuracy is required over full temperature range. | Select TPS799285DDCT when tighter initial VOUT tolerance is needed; otherwise TPS79928DDCT offers optimal cost/performance balance. |
| MCP1703T-2802E/MB | 300 mA rated, 2.5 μA IQ, but higher noise (80 μVRMS), lower PSRR (45 dB @ 1 kHz), and no NR pin or overshoot protection. | Suitable for non-RF digital rails where ultra-low noise and fast transient response are not critical. | Choose MCP1703T-2802E/MB only for cost-sensitive, non-analog applications; avoid in VCO/ADC/PA contexts due to noise and PSRR gap. |
Compared with TPS79928DDCT, TPS799285DDCT delivers tighter output accuracy without changing layout or bill-of-materials, while MCP1703T-2802E/MB trades away RF-grade noise performance and protection features for lower quiescent current and cost - making it unsuitable for precision analog or wireless signal chains.
Availability
TPS79928DDCT is available at Aetrix Electronics and suitable for wearable electronics, smartphone camera modules, RF power amplifier biasing, and VCO core supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS79928DDCT 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 high-reliability applications.
The TPS799 product line was engineered specifically for RF and precision analog systems demanding ultralow noise, high PSRR, and minimal quiescent current - targeting wireless infrastructure, medical sensors, and portable communications devices.
FAQ
What is the maximum input voltage rating for the TPS79928DDCT?
The TPS79928DDCT has an absolute maximum input voltage of 7.0 V. However, its recommended operating input range is 2.7 V to 6.5 V. Operating above 6.5 V risks exceeding thermal limits or violating safe operating area, especially at high ambient temperatures or full 200 mA load. Always maintain VIN ≤ 6.5 V in production designs using TPS79928DDCT.
Does the TPS79928DDCT require an input capacitor for stability?
No, the TPS79928DDCT does not require an input capacitor for stability, but TI recommends a 0.1–1 μF low-ESR ceramic capacitor placed close to the IN and GND pins. This improves transient response, reduces input noise coupling, and enhances PSRR - particularly important when powered from noisy switchers. The TPS79928DDCT remains stable without it, but system-level noise performance benefits significantly with the capacitor.
Can the TPS79928DDCT be used without connecting the NR pin?
Yes, the TPS79928DDCT functions correctly with the NR pin left unconnected (open). In that configuration, output noise rises to ~94 × VOUT = 263 μVRMS. For RF or precision analog use cases, TI strongly recommends connecting a 0.01 μF ceramic capacitor from NR to GND to achieve the specified 29.4 μVRMS noise - a direct design requirement for TPS79928DDCT in VCO and ADC supply roles.
What is the shutdown current of the TPS79928DDCT, and how is it achieved?
The TPS79928DDCT draws just 0.15 μA (typical) in shutdown mode when EN is pulled below 0.4 V. This ultra-low state is achieved by internally disconnecting the bandgap reference, error amplifier, and pass transistor gate drive - effectively halting all regulation activity while retaining fast wake-up capability. This makes TPS79928DDCT ideal for battery-powered devices requiring deep-sleep current budgets under 1 μA.
Is the TPS79928DDCT RoHS-compliant and lead-free?
Yes, the TPS79928DDCT is RoHS-compliant and lead-free per TI's official packaging documentation. It uses matte-tin lead finish on the SOT-23-THIN (DDC) package and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/85% RH. Full compliance data, including REACH and conflict minerals statements, is available in TI's official product change notices for TPS79928DDCT.
TPS79928DDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.18V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB ~ 38dB (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-23-THIN
TPS79928DDCT FAQ
1.How can I place an order for TPS79928DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS79928DDCT 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 TPS79928DDCT reliable?
The price and inventory of TPS79928DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS79928DDCT is usually 5 days.
3.What payment methods are accepted for TPS79928DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS79928DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS79928DDCT?
TPS79928DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS79928DDCT 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 TPS79928DDCT?
For technical support, including TPS79928DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS79928DDCT requirements.
6.How does Aetrix verify that TPS79928DDCT is sourced from the original manufacturer or authorized distributors?
All TPS79928DDCT 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 TPS79928DDCT meets industry standards.
7.What is the process for return or replacement of TPS79928DDCT?
All TPS79928DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS79928DDCT, 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 TPS79928DDCT part is unused and in its original packaging.
Return procedure for TPS79928DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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