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Texas Instruments TPS54429PWPR
- Part No.:
- TPS54429PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54429PWPR.pdf
- Description:
- IC REG BUCK ADJ 4.5A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,813
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Product details
Overview
TPS54429PWPR from Texas Instruments is a 4.5-A synchronous step-down DC/DC converter with integrated high-side (63 mΩ) and low-side (55 mΩ) N-channel MOSFETs, operating from 7 V to 18 V input and delivering adjustable output voltage from 0.76 V to 5.5 V using D-CAP2™ adaptive on-time control. It features 700-kHz switching frequency, power good output, and pre-biased soft start for digital TV and STB power rails.
For engineers reviewing the TPS54429PWPR datasheet, TPS54429PWPR pinout, TPS54429PWPR application, or TPS54429PWPR equivalent, key selection considerations include its D-CAP2™ transient response capability, thermal performance in HTSSOP-14 PowerPAD™ package, ceramic-capacitor compatibility, and cycle-by-cycle overcurrent protection without external compensation.
Technical Context
The TPS54429PWPR implements adaptive on-time D-CAP2™ control-combining constant on-time operation with internal ripple-simulation circuitry to enable stable regulation with ultra-low-ESR ceramic output capacitors. Its feedback loop requires no external compensation components.
It integrates dual MOSFETs, a 5.5-V VREG5 LDO (70 mA capable), and proprietary pre-biased soft-start logic that incrementally enables synchronous rectification to avoid sinking current from an already-biased output rail. Protection includes non-latching OCP, UVP/OVP (65%/120% thresholds), UVLO (3.8 V wake-up), and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7 V to 18 V - supports 12-V intermediate bus systems with margin for automotive transients and industrial line variation. |
| Output Current | 4.5 A continuous - sufficient for core logic rails in HD Blu-ray players and networking terminals. |
| Switching Frequency | 700 kHz - enables compact magnetics and EMI filtering while maintaining efficiency above 90% at 1.05 V/2 A. |
| FET On-Resistance | 63 mΩ (HS), 55 mΩ (LS) - minimizes conduction loss and thermal rise in HTSSOP-14 PowerPAD™ package. |
| Feedback Reference | 0.765 V ±1.5 mV - high-accuracy bandgap reference enabling tight output regulation across temperature. |
| Soft-Start Control | Adjustable via external capacitor - allows controlled ramp-up and prevents inrush into pre-biased outputs. |
| Power Good Threshold | ±10% of VOUT - provides reliable system sequencing signal after 1.7× soft-start time. |
Pinout & Package
TPS54429PWPR uses the 14-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad soldered to PGND for enhanced thermal dissipation (θJB = 26.4°C/W). The package is RoHS-compliant, green, and rated for –20°C to 85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 1) | Output voltage node | Direct connection to output capacitor; used for on-time adjustment in D-CAP2™ mode. |
| VFB (Pin 2) | Feedback input | Monitors output via resistor divider; sets regulated voltage with 0.765-V reference. |
| VREG5 (Pin 3) | Internal 5.5-V LDO output | Supplies internal circuitry and can source up to 70 mA for biasing external components. |
| SS (Pin 4) | Soft-start control | Charged by 2-μA internal current; determines startup ramp time and enables pre-biased start. |
| GND (Pin 5) | Signal ground | Reference for analog circuitry; must be tied to PGND near IC for noise immunity. |
| PG (Pin 6) | Open-drain power good | Asserts high when VOUT is within ±10%; requires external pull-up to VREG5 (20–150 kΩ). |
| EN (Pin 7) | Enable input | Active-high logic control; pulls up internally; disables device and discharges output when low. |
| PGND1, PGND2 (Pins 8, 9) | Power ground returns | Low-side FET sources and current sense inputs; must be connected directly to PowerPAD™. |
| SW1, SW2 (Pins 10, 11) | Switch nodes | Connect high-side drain and low-side source; require low-inductance layout to minimize ringing. |
| VBST (Pin 12) | Bootstrap supply | Drives high-side gate via external 0.1-μF ceramic capacitor to respective SW pin. |
| VIN1, VIN2 (Pins 13, 14) | Main input supplies | Connect to 7–18 V input; dual pins reduce IR drop and improve thermal distribution. |
| PowerPAD™ (Backside) | Thermal & electrical ground | Must be soldered to PCB copper plane tied to PGND; critical for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control mode | Enables fast load-transient response (<10 µs recovery) without external compensation components. |
| Ceramic capacitor support | Proprietary ripple-simulation circuit eliminates need for ESR-based output ripple, enabling use of low-ESR ceramic caps. |
| Pre-biased soft start | Prevents reverse current flow during startup into pre-charged outputs by gradually enabling low-side FET conduction. |
| Integrated VREG5 LDO | 5.5-V, 70-mA regulator powers internal logic and can bias external circuits-reducing BOM count. |
| Output discharge function | 50-Ω internal MOSFET actively discharges VO when EN is low or fault occurs, improving system safety. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Supplies 1.05 V core voltage to SoC and 3.3 V I/O rails in flat-panel TV mainboards with tight space constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise power with fast transient response to handle video processing bursts. Use Value: D-CAP2™ control ensures <10 µs recovery from 2-A load steps, preventing frame drops or audio glitches during scene changes. | Use Scenario: Powers HDMI controller, servo motor drivers, and NAND flash interface in BD players requiring clean, sequenced rails. IC Role / Device Role / Timing Role: Synchronous step-down converter providing 1.8 V and 2.5 V outputs with independent soft-start timing. Use Value: Pre-biased soft start avoids current sink from pre-charged 3.3 V USB or HDMI hot-plug rails during power-up. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Delivers 1.2 V CPU core and 1.5 V memory rails in cable/fiber gateway devices with PoE or AC/DC front-end. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting dynamic voltage scaling and low-quiescent operation during standby. Use Value: <10 µA shutdown current and 92% peak efficiency at 1.2 V/2 A extend battery backup runtime and reduce thermal load. | Use Scenario: Generates 1.05 V, 1.8 V, and 3.3 V rails for demodulator, decoder, and tuner subsystems in satellite/cable STBs. IC Role / Device Role / Timing Role: Dual-MOSFET buck regulator with power good signaling for safe system reset and firmware boot sequencing. Use Value: PG output asserts after 1.7× soft-start time with ±10% accuracy, ensuring reliable microcontroller initialization before peripheral enable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54329PWPR | 3-A output rating, identical pinout and D-CAP2™ architecture but lower current capability and reduced thermal margin. | Suitable for lower-power STB or IPTV client devices where 3-A headroom suffices and board area is constrained. | Select when cost sensitivity outweighs need for 4.5-A headroom and thermal derating margin is acceptable. |
| LM27402SDX/NOPB | External MOSFET controller (no integrated FETs), 750-kHz fixed-frequency PWM, requires compensation network and gate drivers. | Better suited for high-input-voltage (>20 V) or high-temperature (>105°C) designs where discrete FETs offer superior thermal management. | Choose when design requires >18 V input, higher ambient temperature operation, or custom FET selection for efficiency optimization. |
Compared with TPS54429PWPR, TPS54329PWPR offers pin-compatible downsizing for cost-sensitive 3-A applications, while LM27402SDX/NOPB provides design flexibility for non-standard input ranges or thermal environments-but both require additional external components and layout effort.
Availability
TPS54429PWPR is available at Aetrix Electronics and suitable for digital TV power supply, HD Blu-ray player, and networking home terminal applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54429PWPR 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 technologies, with decades of expertise in high-reliability DC/DC conversion solutions.
The TPS54429PWPR belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-efficiency, low-component-count power delivery in consumer electronics with stringent size, thermal, and transient-response requirements.
FAQ
What is the maximum recommended output current for TPS54429PWPR under continuous operation?
The TPS54429PWPR is rated for 4.5-A continuous output current per the datasheet's recommended operating conditions. This assumes proper PCB layout with the PowerPAD™ thermally connected to ≥4 thermal vias to an internal ground plane, ambient temperature ≤85°C, and input voltage ≥12 V. Derating is required at higher temperatures or lower input voltages-e.g., ~3.8 A at 85°C with 7-V input.
Does TPS54429PWPR support ceramic output capacitors, and what is the minimum recommended value?
Yes, TPS54429PWPR fully supports ceramic output capacitors due to its D-CAP2™ control architecture, which does not rely on ESR-induced ripple for stability. The datasheet recommends 22 µF to 68 µF total capacitance-typically implemented with two parallel 22-µF X5R/X7R ceramics (e.g., TDK C3216X5R0J226M)-with typical ESR ≤2 mΩ each.
How does the pre-biased soft start function work in TPS54429PWPR?
In TPS54429PWPR, pre-biased soft start prevents reverse current flow when the output is already charged. When EN goes high, the controller monitors VFB versus internal soft-start voltage. If VFB exceeds the soft-start ramp, it initiates low-side FET pulses with narrow, incrementally increasing on-times until reaching normal duty-cycle operation-ensuring smooth, sink-free ramp-up of VO.
What is the purpose of the VREG5 pin on TPS54429PWPR, and can it power external circuitry?
The VREG5 pin on TPS54429PWPR delivers a regulated 5.5-V output capable of sourcing up to 70 mA. It powers internal control circuitry and can also bias external components such as level shifters, optocouplers, or supervisor ICs. A 1.0-µF ceramic capacitor must be placed between VREG5 and PGND, and the pin is disabled when EN is low.
Is TPS54429PWPR pin-compatible with other devices in the TPS54xx family?
TPS54429PWPR shares the same 14-pin HTSSOP (PWP) package and pinout with TPS54329PWPR and TPS54229PWPR, making them mechanically interchangeable. However, current ratings differ (4.5 A vs. 3 A vs. 2 A), and VFB reference accuracy and thermal limits vary-so electrical validation is required before substitution, even with identical footprints.
TPS54429PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4.5A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
TPS54429PWPR FAQ
1.How can I place an order for TPS54429PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54429PWPR 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 TPS54429PWPR reliable?
The price and inventory of TPS54429PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54429PWPR is usually 5 days.
3.What payment methods are accepted for TPS54429PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54429PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54429PWPR?
TPS54429PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54429PWPR 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 TPS54429PWPR?
For technical support, including TPS54429PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54429PWPR requirements.
6.How does Aetrix verify that TPS54429PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54429PWPR 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 TPS54429PWPR meets industry standards.
7.What is the process for return or replacement of TPS54429PWPR?
All TPS54429PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54429PWPR, 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 TPS54429PWPR part is unused and in its original packaging.
Return procedure for TPS54429PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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