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Texas Instruments TPS71729DCKR
- Part No.:
- TPS71729DCKR
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TPS71729DCKR.pdf
- Description:
- IC REG LINEAR 2.9V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,536
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Product details
Overview
TPS71729DCKR from Texas Instruments is a fixed-output, 2.9 V, 150-mA low-dropout linear regulator in a 5-pin SC-70 package. It delivers ultra-low noise (30 µVRMS, 100 Hz–100 kHz), high PSRR (70 dB at 1 kHz), and low dropout (170 mV typical at 150 mA) for precision analog and RF power rails in space-constrained portable systems.
For engineers reviewing the TPS71729DCKR datasheet, TPS71729DCKR pinout, TPS71729DCKR application, or TPS71729DCKR equivalent, key selection criteria include output noise performance under light-to-moderate load, stability with 1-µF ceramic output capacitance, enable logic compatibility with 1.2 V high threshold, and thermal behavior in SC-70's 279.2°C/W RθJA environment.
Technical Context
The TPS71729DCKR uses a PMOS pass device and BiCMOS process to achieve fast startup, low ground current (45 µA typical), and excellent transient response without requiring minimum load. Its error amplifier features high DC gain and bandwidth optimized for PSRR >67 dB up to 100 kHz.
Fixed-output variants like TPS71729DCKR integrate an internal voltage reference and feedback network; the NR pin accepts a 0.01-µF capacitor to filter bandgap noise and reduce output spectral noise density-enabling 30 µVRMS total noise while maintaining 0.16 ms startup time at 2.9 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9 V ±3% over –40°C to 125°C, load (0–150 mA), line (2.5–6.5 V), and process variation. |
| Dropout Voltage | 170 mV typical at 150 mA - enables regulation from 3.07 V input, critical for Li-ion single-cell or 3.3 V rail derating. |
| PSRR | 70 dB at 1 kHz, 67 dB at 100 kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal PCBs. |
| Output Noise | 30 µVRMS (100 Hz–100 kHz) with CNR = 0.01 µF - meets low-noise requirements for camera sensor analog front-ends and RF LNA biasing. |
| Ground Current | 45 µA typical at 0.1 mA load - extends battery life in always-on sensor nodes and standby subsystems. |
| Enable Threshold | VEN(high) = 1.2 V min - compatible with 1.8 V and 3.3 V GPIO without level-shifting; supports direct tie-to-IN for always-on operation. |
| Stability | Stable with ≥1 µF ceramic output capacitor - eliminates need for tantalum or large bulk capacitors, reducing BOM count and board area. |
Pinout & Package
TPS71729DCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, with exposed pad omitted. Thermal resistance is 279.2°C/W (junction-to-ambient), requiring careful layout for >50 mA continuous loads.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5–6.5 V; requires local 0.1–1 µF ceramic decoupling for PSRR optimization and EMI suppression. |
| 2 GND | Power ground reference | Low-impedance return path for regulator core and output capacitor; must connect directly to PCB ground plane. |
| 3 EN | Active-high enable control | Drives high ≥1.2 V to activate; pulls low ≤0.4 V to enter 0.2–1.5 µA shutdown mode; compatible with standard logic outputs. |
| 4 NR | Noise reduction filter node | Connects to 0.01 µF ceramic capacitor to ground; filters internal bandgap noise and reduces output spectral noise density by >5×. |
| 5 OUT | Regulated output terminal | Delivers 2.9 V ±3%; requires ≥1 µF ceramic capacitor to ground for stability; sensitive to trace inductance in high-frequency noise paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 30 µVRMS (100 Hz–100 kHz) with 0.01 µF NR cap - enables clean biasing of image sensors and RF receivers without post-regulation filtering. |
| High-bandwidth PSRR | 70 dB at 1 kHz and 67 dB at 100 kHz - rejects ripple from switching regulators operating at 100 kHz–1 MHz, common in PMIC-based architectures. |
| Fast startup with NR support | 0.16 ms typical turn-on time at 2.9 V with 0.01 µF NR cap - meets timing requirements for burst-mode camera capture and wake-from-sleep sequences. |
| No minimum load requirement | Stable down to 0 mA output - eliminates need for dummy loads in low-power sleep states, simplifying power sequencing in IoT endpoints. |
| Thermal and current protection | Auto-recovery thermal shutdown at 160°C (re-enable at 140°C) and current limit ≥200 mA - prevents damage during short-circuit or overload events without external circuitry. |
Applications
| Camera Sensor Power | Mobile Phone RF Bias |
|---|---|
Use Scenario: Powering CMOS image sensor analog supply (AVDD) in smartphone rear cameras. IC Role / Device Role / Timing Role: Low-noise, fixed 2.9 V LDO providing clean bias to pixel array and analog signal chain. Use Value: 30 µVRMS noise ensures <1 LSB noise floor in 12-bit ADCs; 70 dB PSRR suppresses 1-MHz DC/DC ripple from main SoC power rail. |
Use Scenario: Supplying gate bias to LTE/5G power amplifiers in handset front-end modules. IC Role / Device Role / Timing Role: Stable 2.9 V rail for PA drain or gate control, synchronized to transmit bursts via EN pin. Use Value: 0.16 ms startup allows rapid PA enable during TDD frame transitions; 170 mV dropout supports efficient operation from 3.3 V shared rail. |
| Wireless Audio Codec | Wearable Health Sensor |
Use Scenario: Powering stereo audio DAC and headphone amplifier in Bluetooth earbuds. IC Role / Device Role / Timing Role: Ultra-low-noise 2.9 V supply for analog audio path, enabled only during playback. Use Value: 30 µVRMS noise prevents audible hiss; 45 µA quiescent current minimizes idle battery drain between audio sessions. |
Use Scenario: Regulating supply for optical heart-rate monitor (PPG) analog front-end in smartwatches. IC Role / Device Role / Timing Role: Precision 2.9 V rail for photodiode transimpedance amplifier and LED driver bias. Use Value: ±3% accuracy over temperature ensures consistent LED intensity and signal gain; SC-70 footprint saves space in compact wearable PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-IQ LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0529PDBVR | Lower IQ (25 µA), higher dropout (225 mV @ 150 mA), no NR pin, same SC-70 package. | Lacks noise reduction capability; unsuitable where <35 µVRMS noise is required. | Select when ultra-low quiescent current outweighs noise performance; verify PSRR at 100 kHz is sufficient for target switching frequency. |
| MCP1700T-2902E/TT | Higher IQ (2.5 µA), lower PSRR (60 dB @ 1 kHz), no NR pin, SOT-23-5 package (larger than SC-70). | Cannot achieve 30 µVRMS noise; limited high-frequency PSRR degrades rejection of fast-switching noise sources. | Choose for cost-sensitive, non-RF applications where 50 µVRMS noise is acceptable and board area is not constrained. |
Compared with TPS71729DCKR, TPS7A0529PDBVR trades noise performance for lower quiescent current, while MCP1700T-2902E/TT offers lower cost but sacrifices both PSRR bandwidth and noise floor-making TPS71729DCKR the optimal choice for RF-adjacent and precision analog rails demanding sub-35 µVRMS noise and >67 dB PSRR to 100 kHz.
Availability
TPS71729DCKR is available at Aetrix Electronics and suitable for camera sensor power, mobile RF bias, wireless audio codec, and wearable health sensor applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TPS71729DCKR 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 company specializing in analog, embedded processing, and digital signal technologies, with leadership in power management ICs for portable and industrial systems.
The TPS717 family was designed specifically for ultra-low-noise, high-PSRR power delivery in battery-powered RF and imaging applications-emphasizing small footprint, fast transient response, and operation across –40°C to 125°C junction temperature.
FAQ
What is the maximum input voltage rating for the TPS71729DCKR?
The TPS71729DCKR has an absolute maximum input voltage of 7 V. However, its recommended operating range is 2.5 V to 6.5 V. Exceeding 6.5 V may trigger undervoltage lockout or degrade long-term reliability, even if within absolute max ratings. Always maintain VIN ≤6.5 V in normal operation for TPS71729DCKR.
Does the TPS71729DCKR require an external noise reduction capacitor?
Yes - the TPS71729DCKR's NR pin must be connected to a 0.01 µF ceramic capacitor to ground to achieve its specified 30 µVRMS output noise. Omitting this capacitor increases noise to ~95 × VOUT µVRMS. The quick-start circuit charges this capacitor within 135 µs, ensuring fast, low-noise startup for TPS71729DCKR.
Can the TPS71729DCKR operate without any output load?
Yes - the TPS71729DCKR is fully stable with zero output load due to its low-current mode circuit, which maintains loop gain at light loads. This eliminates the need for dummy resistors or minimum load requirements, simplifying power design in intermittent-use applications such as motion-triggered wearables using TPS71729DCKR.
What is the thermal shutdown behavior of the TPS71729DCKR?
The TPS71729DCKR disables output at ~160°C junction temperature and re-enables at ~140°C. This hysteresis prevents oscillation near trip point. In the SC-70 package (RθJA = 279.2°C/W), sustained 150 mA output into 3.3 V input risks thermal cycling; derate load or improve copper pour for reliable TPS71729DCKR operation above 60°C ambient.
Is the TPS71729DCKR pin-compatible with other TPS717xx variants in SC-70?
Yes - all TPS717xx SC-70 (DCK) variants share identical 5-pin SC-70 pinout: Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NR, Pin 5 = OUT. Output voltage is set internally; swapping TPS71729DCKR with TPS71718DCKR or TPS71733DCKR requires only firmware or system-level validation-not PCB redesign.
TPS71729DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 2.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 70dB ~ 45dB (100Hz ~ 1MHz)
- 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:
- SC-70-5
TPS71729DCKR FAQ
1.How can I place an order for TPS71729DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS71729DCKR 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 TPS71729DCKR reliable?
The price and inventory of TPS71729DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS71729DCKR is usually 5 days.
3.What payment methods are accepted for TPS71729DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS71729DCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS71729DCKR?
TPS71729DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS71729DCKR 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 TPS71729DCKR?
For technical support, including TPS71729DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS71729DCKR requirements.
6.How does Aetrix verify that TPS71729DCKR is sourced from the original manufacturer or authorized distributors?
All TPS71729DCKR 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 TPS71729DCKR meets industry standards.
7.What is the process for return or replacement of TPS71729DCKR?
All TPS71729DCKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS71729DCKR, 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 TPS71729DCKR part is unused and in its original packaging.
Return procedure for TPS71729DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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