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Texas Instruments TPS79945YZUT
- Part No.:
- TPS79945YZUT
- Manufacturer:
- Texas Instruments
- Package:
- 5-UFBGA, DSBGA
- Datasheet:
-
TPS79945YZUT.pdf
- Description:
- IC REG LINEAR 4.5V 200MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:589
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Product details
Overview
TPS79945YZUT from Texas Instruments is a 200-mA, ultra-low-noise, high-PSRR low-dropout linear regulator in a 5-bump DSBGA package (0.97 mm × 1.34 mm), delivering fixed 4.5 V output with 2% total accuracy over –40°C to +125°C, 40 μA quiescent current, and 100 mV dropout at full load - deployed in RF power stages, wearable sensor rails, and precision analog supply domains.
For engineers reviewing the TPS79945YZUT datasheet, TPS79945YZUT pinout, TPS79945YZUT application, or TPS79945YZUT equivalent, this page delivers verified package mapping (YZU DSBGA), confirmed pin functions (IN/GND/EN/NR/OUT), real-world PSRR/noise/load-transient performance, and validated alternatives for RF-sensitive LDO selection.
Technical Context
The TPS79945YZUT uses a PMOS pass element with advanced BiCMOS process to achieve 100 mV dropout at 200 mA while maintaining 66 dB PSRR at 1 kHz and 10.5 × VOUT μVRMS output noise (10 Hz–100 kHz) with 0.01 μF NR capacitor. Its error amplifier features high gain and bandwidth to sustain regulation under fast line/load transients.
Inrush current protection activates immediately on EN toggle, clamping startup surge; overshoot detection engages a pulldown resistor if VOUT exceeds nominal by >5%. The device integrates UVLO (2.2 V threshold), thermal shutdown (165°C), and current limiting (220–600 mA), all fully specified across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5 V - eliminates external feedback resistors; enables compact layout in space-constrained RF modules. |
| Max Output Current | 200 mA - supports moderate-power RF ICs (e.g., VCOs, WLAN transceivers) without thermal derating in YZU package. |
| Quiescent Current | 40 μA typical - extends battery life in always-on wearable sensors and EPOS terminals. |
| Dropout Voltage | 100 mV at 200 mA - allows operation from 4.6 V input when VOUT = 4.5 V, maximizing efficiency in single-cell Li-ion systems. |
| PSRR @ 1 kHz | 66 dB - suppresses switching noise from adjacent DC/DC converters feeding sensitive analog/RF circuitry. |
| Output Noise | 47.25 μVRMS (10.5 × 4.5 V) - meets stringent phase-noise requirements for VCO bias rails and ADC reference supplies. |
| Accuracy | ±2% over load, line, and temperature - ensures stable voltage for precision op-amps and RF front-end gain blocks. |
| Stability | With ≥2 μF ceramic output capacitor (X5R/X7R) - eliminates need for tantalum or electrolytic caps; reduces BOM count. |
Pinout & Package
TPS79945YZUT is packaged in a 5-bump, die-sized DSBGA (YZU) measuring 0.97 mm × 1.34 mm with 0.4-mm pitch, optimized for ultra-thin mobile and wearable PCBs. Thermal pad is not present; GND bump (B2) serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (C3) | Input supply connection | Accepts 2.7–6.5 V input; minimum VIN = VOUT + VDO = 4.6 V for full 200 mA capability. |
| GND (B2) | Ground reference | Must be connected to system ground plane; serves as thermal and electrical return for regulator core. |
| EN (A1) | Enable control input | Active-high TTL/CMOS-compatible; drives high (>1.2 V) to enable, low (<0.4 V) to shut down (150 nA ISHDN). |
| NR (A3) | Noise reduction terminal | Connects to 0.01 μF capacitor to bypass bandgap noise; reduces output noise to 47.25 μVRMS and boosts PSRR. |
| OUT (C1) | Regulated output | Delivers 4.5 V ±2%; 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 false triggering of upstream protection circuits. |
| Overshoot detection & pulldown | Activates 350-Ω pulldown resistor if VOUT exceeds 4.5 V by >5%, limiting post-enable voltage spike to <225 mV. |
| Ultra-low ground current | 40 μA IQ enables >10-year battery life in coin-cell-powered IoT sensors operating at 100 μA average load. |
| High PSRR at low headroom | Maintains 66 dB rejection at 1 kHz even with VIN – VOUT = 0.25 V, critical for noise-coupled multi-rail power systems. |
| Full-temp specification | 2% accuracy and 100 mV dropout guaranteed from –40°C to +125°C, supporting automotive cabin and industrial edge deployments. |
Applications
| RF Power Amplifier Bias | VCO Core Supply |
|---|---|
|
Use Scenario: Providing clean, stable 4.5 V bias to GaAs pHEMT power amplifiers in Bluetooth/WLAN front-ends. IC Role / Device Role / Timing Role: Low-noise LDO supplying gate/base bias and drain supply rails with minimal phase noise contribution. Use Value: 47.25 μVRMS noise and 66 dB PSRR prevent AM-to-PM conversion and adjacent-channel leakage in 2.4 GHz ISM band. |
Use Scenario: Delivering ultra-stable 4.5 V to voltage-controlled oscillator core circuits in wireless transceivers. IC Role / Device Role / Timing Role: Precision analog supply regulating VCO tuning voltage and active inductor bias points. Use Value: ±2% accuracy and <100 mV dropout ensure consistent oscillation frequency across battery discharge and temperature drift. |
| Wearable Sensor Hub Rail | EPOS Terminal Display Backlight |
|
Use Scenario: Powering MEMS accelerometer/gyroscope signal chains and low-power MCU cores in fitness trackers. IC Role / Device Role / Timing Role: Primary analog rail generator enabling high-SNR sensor data acquisition and wake-on-motion logic. Use Value: 40 μA quiescent current extends coin-cell lifetime beyond 2 years; DSBGA footprint saves >1.2 mm² vs SOT-23-THIN. |
Use Scenario: Supplying 4.5 V to white LED backlight drivers in electronic point-of-sale terminals. IC Role / Device Role / Timing Role: Constant-voltage source driving boost converter feedback or direct LED string control. Use Value: Fast load transient response (≤20 μs recovery) prevents visible flicker during barcode scan illumination bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79945DBVR | SOT-23-THIN (2.9 mm × 1.6 mm); 225.3°C/W RθJA; same electrical specs but larger footprint and higher thermal resistance. | Better suited for prototyping or manual assembly where DSBGA rework is impractical. | Select when board-level test access or hand-soldering is required; avoid in thermally dense RF modules. |
| ADP160AUJZ-4.5-R7 | Analog Devices part; 150 mA max, 18 μA IQ, 170 mV dropout, 55 dB PSRR @ 1 kHz; WLCSP-5 package (1.0 mm × 1.0 mm). | Limited to lower-current analog rails; insufficient for 200 mA RF PA bias; smaller package but lower PSRR/noise performance. | Use only where 150 mA suffices and ultra-low IQ dominates over noise/PSRR requirements. |
Compared with TPS79945YZUT, TPS79945DBVR trades miniaturization for assembly flexibility, while ADP160AUJZ-4.5-R7 sacrifices output current and PSRR for marginal IQ reduction - making TPS79945YZUT the optimal choice for space-constrained, noise-sensitive 200 mA applications.
Availability
TPS79945YZUT is available at Aetrix Electronics and suitable for RF power amplifiers, wearable sensor hubs, VCO bias rails, EPOS display backlights, and industrial edge node power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS79945YZUT 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 power management ICs, with decades of LDO innovation focused on performance, reliability, and system integration.
The TPS799 product line was designed specifically for RF and precision analog applications demanding ultralow noise, high PSRR, and minimal quiescent current in miniature packages - targeting wireless infrastructure, handheld devices, and sensor-edge systems.
FAQ
What is the maximum input voltage rating for the TPS79945YZUT?
The TPS79945YZUT has an absolute maximum input voltage of 7.0 V. However, its recommended operating range is 2.7 V to 6.5 V. For reliable 4.5 V output at 200 mA, minimum input must be 4.6 V (4.5 V + 100 mV dropout). Exceeding 6.5 V risks violating recommended conditions and may accelerate parametric drift over time.
Does the TPS79945YZUT require an external noise-reduction capacitor to achieve specified output noise?
Yes - the TPS79945YZUT achieves its 47.25 μVRMS (10.5 × VOUT) output noise specification only when a 0.01 μF ceramic capacitor is connected between the NR pin and GND. Without CNR, output noise rises to ~423 μVRMS (94 × VOUT), degrading phase noise in VCO and RF PA applications.
Can the TPS79945YZUT be used without an enable signal?
Yes - the EN pin of the TPS79945YZUT can be directly tied to IN to enable permanent operation. This configuration draws 40 μA quiescent current continuously and disables shutdown functionality. It is commonly used in always-on sensor rails where power cycling is unnecessary.
What is the thermal performance of the TPS79945YZUT in its YZU DSBGA package?
The TPS79945YZUT in YZU package has a junction-to-board thermal resistance (RθJB) of 84.7°C/W and junction-to-ambient (RθJA) of 143.3°C/W. With 200 mA load and 100 mV dropout (20 mW dissipation), junction temperature rise above ambient is ~2.85°C - well within safe margin for +85°C ambient environments.
Is the TPS79945YZUT stable with a 2.2 μF X7R ceramic output capacitor?
Yes - the TPS79945YZUT is explicitly characterized and guaranteed stable with ≥2.2 μF X5R or X7R ceramic capacitors (ESR < 1.0 Ω). Using a 2.2 μF X7R cap meets all stability, transient response, and noise requirements per TI's SBVS056L datasheet, Section 6.5 and 8.2.2.1.
TPS79945YZUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-UFBGA, DSBGA
- 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):
- 4.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.16V @ 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:
- 5-DSBGA
TPS79945YZUT FAQ
1.How can I place an order for TPS79945YZUT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS79945YZUT 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 TPS79945YZUT reliable?
The price and inventory of TPS79945YZUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS79945YZUT is usually 5 days.
3.What payment methods are accepted for TPS79945YZUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS79945YZUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS79945YZUT?
TPS79945YZUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS79945YZUT 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 TPS79945YZUT?
For technical support, including TPS79945YZUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS79945YZUT requirements.
6.How does Aetrix verify that TPS79945YZUT is sourced from the original manufacturer or authorized distributors?
All TPS79945YZUT 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 TPS79945YZUT meets industry standards.
7.What is the process for return or replacement of TPS79945YZUT?
All TPS79945YZUT units undergo pre-shipment inspection (PSI). If there is an issue with TPS79945YZUT, 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 TPS79945YZUT part is unused and in its original packaging.
Return procedure for TPS79945YZUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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