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Texas Instruments TPS54429ERSAR
- Part No.:
- TPS54429ERSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54429ERSAR.pdf
- Description:
- IC REG BUCK ADJ 4.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,265
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Product details
Overview
TPS54429ERSAR 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, and Auto-Skip Eco-mode™ for light-load efficiency. It operates from 7 V to 18 V input, delivers adjustable output from 0.76 V to 5.5 V, and targets digital TV, Blu-ray player, and STB power rails.
For engineers reviewing the TPS54429ERSAR datasheet, TPS54429ERSAR pinout, TPS54429ERSAR application, or TPS54429ERSAR equivalent, key selection criteria include its 700-kHz pseudo-constant switching frequency, 16-pin QFN (RSA) thermal-pad package, cycle-by-cycle overcurrent protection, and compatibility with ultra-low-ESR ceramic output capacitors.
Technical Context
The TPS54429ERSAR implements D-CAP2™ mode control-combining adaptive on-time PWM with internal compensation-to achieve fast transient response without external loop compensation. Its on-time is inversely proportional to VIN and proportional to VOUT, enabling stable operation across 7–18 V input while maintaining ~700 kHz nominal frequency.
Eco-mode™ enables discontinuous conduction at light loads by disabling the low-side FET when inductor current reaches zero, reducing switching losses. The device also integrates a 5.5-V VREG5 LDO (70 mA capable), power-good open-drain output with 1.7× soft-start delay activation, and internal 50-Ω output discharge MOSFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7 V to 18 V - supports 12-V industrial and consumer bus rails with ±1-V margin for ripple and dropout. |
| Output Current | 4.5 A continuous - sufficient for core voltage rails of SoCs in digital TVs and set-top boxes. |
| Switching Frequency | 700 kHz nominal - enables compact magnetics and EMI filtering while balancing efficiency and thermal performance. |
| Integrated FETs | 63 mΩ high-side / 55 mΩ low-side - optimized for lower duty cycle applications (e.g., 1.05 V @ 12 VIN), minimizing conduction loss. |
| Feedback Reference | 0.765 V ±1.5 mV - high-accuracy bandgap reference enabling tight output regulation (±1%) across temperature. |
| Soft-Start Control | Adjustable via external capacitor - prevents inrush current; pre-biased soft-start avoids sinking current from powered-up outputs. |
| Protection Features | Cycle-by-cycle OCP, output OVP/UVP (115%/65%), thermal shutdown (165°C), UVLO (3.8 V VREG5 wake-up) |
Pinout & Package
TPS54429ERSAR uses a 16-pin QFN (RSA) package with exposed thermal pad (PowerPAD™), designed for high-power density and efficient heat dissipation to PCB ground plane via soldered thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 16) | Output voltage node | Connects directly to output capacitor; used for on-time adjustment and feedback sensing path. |
| VFB (Pin 1) | Feedback input | Monitors divided output voltage; 0.765-V reference sets regulation point with resistor divider. |
| VREG5 (Pin 2) | Internal 5.5-V LDO output | Powers internal circuitry and can source up to 70 mA externally; requires 1-µF ceramic bypass to PGND. |
| SS (Pin 3) | Soft-start control | Charged by 2-µA internal current; external capacitor sets ramp time and enables pre-biased startup. |
| GND (Pin 4) | Signal ground | Reference for analog blocks; must be star-connected to PGND near IC to minimize noise coupling. |
| PG (Pin 5) | Open-drain power-good | Asserts high after 1.7× soft-start time when VFB is within ±10%; requires 20–150-kΩ pull-up to VREG5. |
| EN (Pin 6) | Enable input | Active-high logic control; threshold is 2 V (high) / 0.48 V (low); pulls down IVINSDN to 1.8 µA in shutdown. |
| PGND1, PGND2 (Pins 7, 8) | Power ground returns | Low-side MOSFET source connections and current-sense comparator inputs; must tie strongly to thermal pad. |
| SW1, SW2 (Pins 9, 10, 11) | Switch nodes | High-side drain / low-side source junctions; drive external inductors; require tight layout to minimize ringing. |
| VBST (Pin 12) | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-µF ceramic cap to respective SW pin for high-side gate drive. |
| VIN1, VIN2, VIN3 (Pins 13, 14, 15) | Main input supply | Parallel pins reduce IR drop and improve current sharing; connect to bulk + decoupling capacitors near package. |
| Thermal Pad (Backside) | Thermal and electrical ground | Must be soldered to PGND plane; enables θJB = 14.9°C/W and supports full 4.5-A operation at 85°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Eliminates need for external compensation components while delivering <10-µs load transient response for SoC core rails. |
| Auto-Skip Eco-mode™ | Reduces light-load quiescent current to <10 µA and maintains >85% efficiency at 10-mA output in 12-V→1.05-V conversion. |
| Ultra-low-ESR capacitor support | Proprietary internal circuitry stabilizes control loop with ceramic, POSCAP, and SP-CAP outputs-no ESR requirement. |
| Pre-biased soft-start | Prevents reverse current flow during startup into pre-charged outputs by ramping low-side gate drive duty cycle gradually. |
| Integrated VREG5 LDO | 5.5-V ±3% regulated output powers internal logic and external bias circuits; eliminates need for auxiliary 5-V rail. |
| Output discharge function | 50-Ω internal MOSFET actively discharges VO to PGND when EN is low or fault occurs-prevents floating output states. |
Applications
| Digital Television Power Supply | Blu-ray Disc Player Core Rail |
|---|---|
|
Use Scenario: Powers 1.05-V/3-A SoC core and 3.3-V/1-A I/O rails in slim-form-factor digital TVs with strict standby power limits. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with fast transient response to video processing load steps. Use Value: Eco-mode™ reduces no-load input current to <10 µA, meeting Energy Star Tier 2 standby requirements without auxiliary controllers. |
Use Scenario: Supplies 1.2-V/2.5-A processor and 1.8-V/1.5-A memory rails in high-definition Blu-ray players with burst-mode video decoding. IC Role / Device Role / Timing Role: Synchronous buck converter providing low-noise, low-ripple power with D-CAP2™-enabled sub-10-µs recovery from 0→3-A load steps. Use Value: 63/55-mΩ FETs and 700-kHz switching enable <15-mVpp output ripple at 4-A load-preserving signal integrity in high-speed HDMI interfaces. |
| Home Networking Terminal | Digital Set-Top Box (STB) |
|
Use Scenario: Delivers 1.8-V/2-A CPU voltage and 5-V/0.5-A USB peripheral rail in cable/fiber gateways with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC solution replacing discrete controller+FET designs in multi-rail power trees. Use Value: 16-pin QFN with exposed thermal pad achieves 4.5-A capability in <25 mm² footprint-reducing board area vs. HTSSOP alternatives. |
Use Scenario: Generates 1.0-V/4-A application processor core voltage and 1.2-V/2-A DDR3 memory rail in cost-sensitive STBs with 85°C ambient rating. IC Role / Device Role / Timing Role: High-current buck regulator supporting rapid channel-change transients and thermal-cycled field operation. Use Value: Cycle-by-cycle OCP and 165°C thermal shutdown ensure reliable operation under sustained overload or poor heatsinking conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428ERSAR | Same 16-pin QFN package and D-CAP2™ control, but rated for 4-A output (vs. 4.5-A) and higher RDS(on) (70/60 mΩ). | Suitable for lower-current variants where 4-A suffices and marginal efficiency loss is acceptable. | Select when BOM consolidation favors same footprint and control architecture, but full 4.5-A headroom is unnecessary. |
| MP2315DJ-LF-Z | 4.5-A monolithic buck with 500-kHz fixed frequency, no Eco-mode, and different pinout (8-pin SOIC-EP); lacks VREG5 and PG. | Better suited for cost-driven, non-precision applications where power-good signaling and auxiliary 5-V rail are omitted. | Choose only if system design omits PG monitoring and VREG5 usage, and layout allows SOIC-EP thermal relief. |
Compared with TPS54429ERSAR, TPS54428ERSAR offers identical integration and control but reduced current capability, while MP2315DJ-LF-Z trades feature richness (no VREG5, no PG, no Eco-mode) for lower unit cost and simpler layout-neither is pin-compatible.
Availability
TPS54429ERSAR is available at Aetrix Electronics and suitable for digital television, Blu-ray player, and set-top box power supply designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54429ERSAR 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 highly integrated, thermally optimized synchronous buck converters targeting consumer and industrial power rails where small size, light-load efficiency, and fast transient response are critical.
FAQ
What is the maximum continuous output current supported by the TPS54429ERSAR?
The TPS54429ERSAR is rated for 4.5 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). This assumes use of the 16-pin QFN package with soldered thermal pad and adequate copper area per TI's layout guidelines. Derating applies above 85°C ambient or with insufficient thermal vias.
Does the TPS54429ERSAR require external compensation components?
No, the TPS54429ERSAR uses D-CAP2™ adaptive on-time control, which embeds internal compensation and eliminates the need for external Type-II or Type-III compensation networks. Stability is maintained across input voltage, output voltage, and output capacitor ESR variations-including zero-ESR ceramics-without added components.
How does Eco-mode™ improve light-load efficiency in the TPS54429ERSAR?
Eco-mode™ in the TPS54429ERSAR disables the low-side FET when inductor current reaches zero, entering discontinuous conduction mode. This reduces switching losses and cuts quiescent current to under 10 µA, enabling >85% efficiency at 10-mA load-critical for standby power compliance in consumer electronics.
Can the TPS54429ERSAR safely start up into a pre-biased output?
Yes, the TPS54429ERSAR includes dedicated pre-biased soft-start circuitry. When the SS pin voltage exceeds the existing VFB level, it incrementally enables low-side FET conduction cycle-by-cycle-preventing reverse current flow and ensuring monotonic, controlled ramp-up of the output voltage.
What is the purpose of the VREG5 pin on the TPS54429ERSAR?
The VREG5 pin on the TPS54429ERSAR provides a regulated 5.5-V output (±3%) capable of sourcing up to 70 mA. It powers internal control circuitry and can supply external bias for drivers or level shifters. A 1-µF ceramic capacitor to PGND is mandatory for stability, and VREG5 must exceed 3.8 V to enable device operation.
TPS54429ERSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™, Eco-Mode™
- Package/Case:
- 16-VQFN Exposed Pad
- 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:
- 16-QFN (4x4)
TPS54429ERSAR FAQ
1.How can I place an order for TPS54429ERSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54429ERSAR 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 TPS54429ERSAR reliable?
The price and inventory of TPS54429ERSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54429ERSAR is usually 5 days.
3.What payment methods are accepted for TPS54429ERSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54429ERSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54429ERSAR?
TPS54429ERSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54429ERSAR 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 TPS54429ERSAR?
For technical support, including TPS54429ERSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54429ERSAR requirements.
6.How does Aetrix verify that TPS54429ERSAR is sourced from the original manufacturer or authorized distributors?
All TPS54429ERSAR 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 TPS54429ERSAR meets industry standards.
7.What is the process for return or replacement of TPS54429ERSAR?
All TPS54429ERSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54429ERSAR, 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 TPS54429ERSAR part is unused and in its original packaging.
Return procedure for TPS54429ERSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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