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Texas Instruments TPS54429EPWPR
- Part No.:
- TPS54429EPWPR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54429EPWPR.pdf
- Description:
- IC REG BUCK ADJ 4.5A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
TPS54429EPWPR 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, D-CAP2™ adaptive on-time control, 700-kHz pseudo-fixed switching frequency, and Eco-mode™ for light-load efficiency. It delivers regulated output voltages from 0.76 V to 5.5 V across a 7–18 V input range and is used in digital TV power supplies, Blu-ray players, and STB applications.
For engineers reviewing the TPS54429EPWPR datasheet, TPS54429EPWPR pinout, TPS54429EPWPR application, or TPS54429EPWPR equivalent, key selection considerations include its HTSSOP-14 PowerPAD™ package, cycle-by-cycle overcurrent protection, pre-biased soft-start capability, power-good output, and compatibility with ultra-low-ESR ceramic output capacitors.
Technical Context
The TPS54429EPWPR implements D-CAP2™ mode control using an adaptive on-time PWM architecture that eliminates external compensation while supporting ceramic and polymer output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, enabling stable operation without loop compensation components.
It integrates dual N-FETs with 63 mΩ high-side and 55 mΩ low-side RDS(on), a 5.5-V VREG5 LDO (70 mA capable), adjustable soft-start via external capacitor, and auto-skip Eco-mode™ that transitions seamlessly between PWM and discontinuous conduction modes to maintain >85% efficiency at 10 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7 V to 18 V - supports wide industrial and consumer DC bus inputs including 12-V systems with headroom for transients. |
| Output Current | 4.5 A continuous - sufficient for core logic rails in digital video and networking equipment. |
| Switching Frequency | 700 kHz nominal - enables compact magnetics and filtering while balancing EMI and efficiency trade-offs. |
| Feedback Reference | 0.765 V ±1.5% - precise bandgap reference enabling accurate output regulation down to sub-1-V levels. |
| High-Side RDS(on) | 63 mΩ at 25°C - minimizes conduction loss in high-duty-cycle applications like 3.3-V or 2.5-V outputs. |
| Low-Side RDS(on) | 55 mΩ at 25°C - reduces synchronous rectification losses during light-load Eco-mode operation. |
| Shutdown Current | ≤10 μA - enables ultra-low quiescent power in standby or battery-backed subsystems. |
| Thermal Shutdown | 165°C threshold with 30°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
TPS54429EPWPR uses the 14-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad, requiring solder connection to PGND for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 1) | Output voltage node | Connects directly to output capacitor and inductor; used for on-time adjustment and feedback sensing path. |
| VFB (Pin 2) | Feedback input | Monitors divided output voltage; internal 0.765-V reference sets regulation point for resistor-divider programming. |
| VREG5 (Pin 3) | 5.5-V internal LDO output | Supplies internal circuitry and can source up to 70 mA externally; requires 1-μF ceramic bypass to PGND. |
| SS (Pin 4) | Soft-start control | Charged by 2-μA internal current source; external capacitor sets ramp time and enables pre-biased startup. |
| GND (Pin 5) | Signal ground | Reference for analog circuits; must be star-connected to PGND near device to avoid noise coupling. |
| PG (Pin 6) | Open-drain power-good | Asserts high after 1.7× soft-start time when VOUT is within ±10%; sinks up to 5 mA when faulted. |
| EN (Pin 7) | Enable input | Active-high logic control; pulls up internally; <0.48 V disables device and activates output discharge. |
| PGND1, PGND2 (Pins 8, 9) | Power ground returns | Low-side FET source connections and current-sense comparator inputs; must tie strongly to PowerPAD™. |
| SW1, SW2 (Pins 10, 11) | Switch nodes | Drain-source junctions of internal FETs; connect to inductor and bootstrap capacitor; high di/dt paths. |
| VBST (Pin 12) | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-μF ceramic cap to SW1/SW2 for high-side gate drive. |
| VIN1, VIN2 (Pins 13, 14) | Main input supply | Connect to bulk input capacitor; dual pins reduce IR drop and improve thermal distribution under 4.5-A load. |
| PowerPAD™ (Backside) | Thermal and electrical ground | Must be soldered to ≥4 thermal vias connected to inner PGND plane; primary path for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero-external-compensation design with fast transient response (<10 μs recovery) and stability with ceramic output caps. |
| Eco-mode™ auto-skip operation | Maintains >88% efficiency at 10 mA load by disabling low-side FET when inductor current reaches zero. |
| Pre-biased soft-start | Prevents output sinking during startup by gradually enabling synchronous rectification cycle-by-cycle. |
| Integrated 5.5-V VREG5 LDO | Eliminates need for external bias rail; powers internal logic and supports external loads up to 70 mA. |
| Cycle-by-cycle overcurrent protection | Detects valley current in low-side FET; non-latching shutdown with 5.2–8.0 A trip range across temperature. |
| Output discharge on disable | Activates 50-Ω internal MOSFET from VO to PGND when EN = low, preventing hold-up in powered-down states. |
Applications
| Digital Television Power Supply | Blu-ray Disc Player Core Rail |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and video processing ICs in flat-panel TV main board. IC Role / Device Role / Timing Role: Primary 1.2-V/3.3-V buck regulator delivering up to 4.5 A with tight transient response to handle burst video decoding loads. Use Value: D-CAP2™ control ensures <50-mV output deviation during 2-A load steps, reducing required output capacitance by 40% vs. voltage-mode controllers. |
Use Scenario: Supplies 1.8-V and 2.5-V rails to BD-ROM controller, HDMI PHY, and audio DAC in optical disc players. IC Role / Device Role / Timing Role: Dual-output-capable buck converter (with external resistors) providing isolated, low-noise core and I/O supplies. Use Value: Eco-mode™ extends standby battery life in portable BD players by maintaining 92% efficiency at 5-mA quiescent load. |
| Home Networking Terminal | Digital Set-Top Box (STB) |
|
Use Scenario: Regulates 1.05-V CPU core voltage and 3.3-V peripheral bus in cable/fiber gateway devices. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage handling dynamic traffic-induced load swings up to 4 A. Use Value: PowerPAD™ HTSSOP package achieves ≤55.6°C/W θJA, enabling operation at full load in sealed, fanless enclosures. |
Use Scenario: Generates 1.2-V SoC core, 1.8-V memory, and 3.3-V interface rails in satellite/cable STBs with thermal constraints. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + LDO combinations, reducing BOM count and layout area. Use Value: Integrated VREG5 eliminates external 5-V bias supply, simplifying design and improving system-level reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428EVM-197 | Same D-CAP2™ architecture and pinout, but rated for 4-A output; lower RDS(on) (52/42 mΩ) and tighter VREF (0.76 V ±0.5%). | Suitable for space-constrained designs where 4-A rating suffices and tighter output tolerance is required. | Select TPS54428EVM-197 only if 4-A output and enhanced reference accuracy justify reduced margin versus 4.5-A rating. |
| MP2315DJ-LF-Z | 4.5-A monolithic buck with 500-kHz fixed frequency, no Eco-mode™, and 0.8-V reference; lacks VREG5 and pre-biased soft-start. | Better for cost-sensitive, non-pre-biased applications where light-load efficiency is secondary to BOM simplicity. | Choose MP2315DJ-LF-Z when thermal budget allows higher light-load quiescent current and VREG5 functionality is unnecessary. |
Compared with TPS54429EPWPR, TPS54428EVM-197 offers higher precision but lower current headroom, while MP2315DJ-LF-Z trades Eco-mode™ efficiency and integrated bias for lower unit cost and simpler layout-making TPS54429EPWPR optimal for thermally constrained, pre-biased, multi-rail consumer electronics.
Availability
TPS54429EPWPR is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player core rails, and STB applications requiring stable component supply, long-term production continuity, and automotive-grade reliability screening.
Supply support for TPS54429EPWPR 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 expertise in high-efficiency DC/DC conversion.
The TPS54429E product line delivers adaptive on-time synchronous buck converters optimized for consumer electronics power rails, emphasizing light-load efficiency, small solution size, and seamless integration with ceramic capacitors.
FAQ
What is the maximum output current supported by the TPS54429EPWPR?
The TPS54429EPWPR supports up to 4.5 A of continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its cycle-by-cycle overcurrent protection triggers between 5.2 A and 8.0 A depending on temperature, ensuring safe operation during transient surges without latch-off.
Does the TPS54429EPWPR support pre-biased output startup?
Yes, the TPS54429EPWPR includes proprietary pre-biased soft-start circuitry. When the output voltage is already present at startup, it incrementally enables the low-side FET gate drive on a cycle-by-cycle basis to prevent sinking current from the pre-biased rail-ensuring smooth, non-disruptive regulation acquisition in hot-swap or multi-rail systems.
What package type does the TPS54429EPWPR use, and how is thermal management handled?
The TPS54429EPWPR uses the 14-pin HTSSOP (PWP) package with an exposed PowerPAD™ thermal pad. Effective thermal management requires soldering the PowerPAD™ to a dedicated PGND copper area with ≥4 thermal vias connected to inner ground planes-achieving a junction-to-ambient thermal resistance of 55.6°C/W per datasheet characterization.
Can the TPS54429EPWPR operate with ceramic output capacitors?
Yes, the TPS54429EPWPR is specifically designed for ultra-low-ESR ceramic output capacitors. Its D-CAP2™ control architecture eliminates the need for ESR-based compensation, enabling stable operation with 22–68 μF X5R/X7R ceramics-reducing output ripple, board area, and cost versus electrolytic or polymer alternatives.
What is the function of the VREG5 pin on the TPS54429EPWPR?
The VREG5 pin on the TPS54429EPWPR provides a regulated 5.5-V output (±4% over temperature) capable of sourcing up to 70 mA. It powers internal control circuitry and can serve as a bias supply for external components such as level shifters or optocouplers-eliminating the need for a separate 5-V LDO in many designs.
TPS54429EPWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™, Eco-Mode™
- 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
TPS54429EPWPR FAQ
1.How can I place an order for TPS54429EPWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54429EPWPR 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 TPS54429EPWPR reliable?
The price and inventory of TPS54429EPWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54429EPWPR is usually 5 days.
3.What payment methods are accepted for TPS54429EPWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54429EPWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54429EPWPR?
TPS54429EPWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54429EPWPR 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 TPS54429EPWPR?
For technical support, including TPS54429EPWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54429EPWPR requirements.
6.How does Aetrix verify that TPS54429EPWPR is sourced from the original manufacturer or authorized distributors?
All TPS54429EPWPR 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 TPS54429EPWPR meets industry standards.
7.What is the process for return or replacement of TPS54429EPWPR?
All TPS54429EPWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54429EPWPR, 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 TPS54429EPWPR part is unused and in its original packaging.
Return procedure for TPS54429EPWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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