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Texas Instruments TPS54429ERSAT
- Part No.:
- TPS54429ERSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54429ERSAT.pdf
- Description:
- IC REG BUCK ADJ 4.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:361
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Product details
Overview
TPS54429ERSAT 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 switching frequency, and Eco-mode™ for light-load efficiency. It delivers regulated output from 0.76 V to 5.5 V across 7–18 V input, supporting digital TV power supplies and networking terminal applications.
For engineers reviewing the TPS54429ERSAT datasheet, TPS54429ERSAT pinout, TPS54429ERSAT application, or TPS54429ERSAT equivalent, key selection factors include its QFN-16 package thermal performance (θJCbot = 4.9 °C/W), pre-biased soft-start capability, cycle-by-cycle overcurrent protection, and compatibility with ultra-low-ESR ceramic output capacitors.
Technical Context
The TPS54429ERSAT 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 VO, yielding pseudo-constant 700-kHz operation while maintaining stability with ceramic output capacitors.
Eco-mode™ enables seamless transition from PWM to pulse-frequency modulation at light loads, reducing quiescent current to <10 μA in shutdown and sustaining >85% efficiency at 10 mA output. Protection includes non-latching cycle-by-cycle OCP (5.2–8.0 A), output OVP/UVP (115–125%/60–70%), thermal shutdown (165°C), and UVLO (3.5–4.1 V).
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 margin. |
| Output Current | 4.5 A continuous - sufficient for powering SoCs, FPGAs, and DDR memory rails in embedded systems. |
| Switching Frequency | 700 kHz - enables compact magnetics and filtering while balancing EMI and efficiency trade-offs. |
| FET On-Resistance | 63 mΩ (HS), 55 mΩ (LS) - minimizes conduction loss and improves full-load efficiency up to 95%. |
| Feedback Reference | 0.765 V ±1.5 mV - high-accuracy bandgap reference enabling precise output regulation across temperature. |
| Soft-Start Control | Adjustable via external capacitor - prevents inrush current and enables controlled ramp-up even with pre-biased outputs. |
| Power Good Output | Open-drain PG with 85–95% VFB threshold - provides reliable system sequencing and fault indication. |
Pinout & Package
TPS54429ERSAT uses a 16-pin QFN (RSA) package with exposed thermal pad (PowerPAD™), optimized for low thermal resistance (θJCbot = 4.9 °C/W) and high-power density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 16) | Output voltage node | Connects directly to output capacitor and load; used for on-time adjustment in D-CAP2™ control. |
| VFB (Pin 1) | Feedback input | Monitors divided output voltage; sets regulation point via resistor divider (0.765 V reference). |
| VREG5 (Pin 2) | 5.5-V internal LDO output | Powers internal circuitry and can source up to 70 mA for external bias; requires 1-μF ceramic bypass. |
| SS (Pin 3) | Soft-start control | Charged by 2-μA internal current; enables adjustable startup time and pre-biased start capability. |
| GND (Pin 4) | Signal ground | Reference for analog circuitry; must be connected to PGND near IC for noise immunity. |
| PG (Pin 5) | Power good indicator | Open-drain output active after 1.7× soft-start time when VFB is within ±10% of target. |
| EN (Pin 6) | Enable input | Active-high logic control (VENH ≥ 2 V); pulls down to disable device and activate output discharge (50 Ω). |
| PGND1, PGND2 (Pins 7,8) | Power ground returns | Low-side MOSFET source connections and current-sense return paths; require low-inductance tie to thermal pad. |
| SW1, SW2 (Pins 9,10,11) | Switch nodes | High-side drain / low-side source connection points; drive external inductor; critical for EMI layout. |
| VBST (Pin 12) | Bootstrap supply | Provides gate drive voltage for high-side FET; requires 0.1-μF ceramic capacitor to respective SW pin. |
| VIN1, VIN2 (Pins 13,14,15) | Main input supply | Connects to 7–18 V input rail; multiple pins reduce IR drop and improve current sharing. |
| Thermal Pad (Backside) | Thermal interface | Must be soldered to PGND plane with ≥6 thermal vias to achieve rated θJC and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables stable operation with ceramic output capacitors and eliminates need for external compensation network. |
| Eco-mode™ auto-skip operation | Maintains >85% efficiency at 10 mA load while reducing quiescent current to <10 μA in shutdown. |
| Pre-biased soft-start | Prevents sinking current from pre-charged output rails by gradually enabling synchronous rectification. |
| Cycle-by-cycle overcurrent protection | Detects valley current during low-side conduction; trips at 5.2–8.0 A with non-latching recovery. |
| Integrated VREG5 LDO | Delivers regulated 5.5 V (±0.2 V) from VIN; powers internal logic and supports external bias up to 70 mA. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers main SoC, video decoder, and HDMI interface in flat-panel TVs with 12-V input bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2 V/3.3 V rails with fast transient response to handle burst video processing loads. Use Value: D-CAP2™ control reduces required output capacitance by 30% vs. traditional PWM, lowering BOM cost and board area. | Use Scenario: Supplies CPU, Ethernet PHY, and memory in residential gateways and set-top box modems. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping 12 V down to 5 V/3.3 V for mixed-signal subsystems. Use Value: Eco-mode™ extends standby battery life in always-on devices by cutting light-load power consumption by 5× vs. fixed-frequency alternatives. |
| High Definition Blu-ray Disc™ Player | Digital Set Top Box (STB) |
Use Scenario: Regulates power for laser diode driver, servo motor controller, and MPEG decoder ASIC. IC Role / Device Role / Timing Role: Secondary buck stage converting 5 V to 1.8 V core voltage with tight ripple (<15 mVpp) for signal integrity. Use Value: Ultra-low ESR ceramic capacitor support ensures <50 mVpp output ripple at 4-A peak load, meeting video timing jitter specs. | Use Scenario: Provides clean, sequenced 1.2 V, 1.8 V, and 3.3 V rails for multi-core ARM processors and tuners. IC Role / Device Role / Timing Role: Main system regulator with power-good signaling to enable FPGA configuration and boot sequence coordination. Use Value: Adjustable soft-start and pre-biased start prevent brownouts during cold boot and hot-plug events in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428ERSAT | Same pinout and D-CAP2™ architecture but rated for 4-A output (vs. 4.5-A); Rdson(HS) = 72 mΩ (vs. 63 mΩ). | Suitable for lower-current designs where 0.5-A headroom is not required; slightly lower efficiency at full load. | Select when BOM cost reduction is prioritized over marginal current/efficiency gain. |
| MP2315DJ-LF-Z | Monolithic 4-A buck with 500-kHz fixed frequency; no Eco-mode™; requires external compensation; 80 mΩ/55 mΩ FETs. | Better suited for noise-sensitive audio applications due to fixed frequency; lacks pre-biased soft-start and VREG5 LDO. | Choose when deterministic EMI profile is mandatory and system-level sequencing is handled externally. |
Compared with TPS54429ERSAT, TPS54428ERSAT offers identical layout compatibility but trades 0.5-A current capacity and 9-mΩ higher HS RDS(on) for lower unit cost, while MP2315DJ-LF-Z sacrifices Eco-mode™ efficiency and integrated biasing for predictable switching noise and broader distributor availability.
Availability
TPS54429ERSAT is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and high-definition Blu-ray disc players requiring stable component supply, long-term production continuity, and automotive-grade reliability screening.
Supply support for TPS54429ERSAT 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 and industrial systems demanding fast transient response, light-load efficiency, and minimal external components.
FAQ
What is the maximum output current supported by the TPS54429ERSAT?
The TPS54429ERSAT supports 4.5 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its cycle-by-cycle overcurrent limit triggers between 5.2 A and 8.0 A depending on temperature and test conditions, providing robust short-circuit protection without latch-off behavior.
Does the TPS54429ERSAT require external compensation components?
No, the TPS54429ERSAT does not require external compensation components. Its D-CAP2™ adaptive on-time control architecture embeds internal compensation, enabling stable operation with ceramic output capacitors and eliminating the need for external RC networks typically required in voltage-mode or current-mode controllers.
How does the Eco-mode™ function improve efficiency at light loads in the TPS54429ERSAT?
The TPS54429ERSAT's Eco-mode™ enables automatic transition from fixed-frequency PWM to pulse-frequency modulation at light loads, reducing switching losses. This lowers quiescent current to <10 μA in shutdown and sustains >85% efficiency at 10 mA output-critical for always-on consumer electronics like set-top boxes and networking terminals.
Can the TPS54429ERSAT safely start up into a pre-biased output voltage?
Yes, the TPS54429ERSAT supports pre-biased soft-start. When the output is already charged, its internal circuitry gradually enables the low-side FET with narrow, incrementally widening pulses-preventing reverse current flow and ensuring smooth, monotonic ramp-up to regulation without disrupting downstream circuitry.
What thermal management requirements apply to the TPS54429ERSAT QFN package?
TPS54429ERSAT in the RSA QFN-16 package requires soldering of its exposed thermal pad to a PGND copper plane with ≥6 thermal vias. This achieves θJCbot = 4.9 °C/W and prevents thermal shutdown under 4.5-A load at 85°C ambient. Layout guidelines mandate short, wide VIN/PGND traces and Kelvin feedback routing to maintain stability.
TPS54429ERSAT 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)
TPS54429ERSAT FAQ
1.How can I place an order for TPS54429ERSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54429ERSAT 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 TPS54429ERSAT reliable?
The price and inventory of TPS54429ERSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54429ERSAT is usually 5 days.
3.What payment methods are accepted for TPS54429ERSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54429ERSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54429ERSAT?
TPS54429ERSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54429ERSAT 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 TPS54429ERSAT?
For technical support, including TPS54429ERSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54429ERSAT requirements.
6.How does Aetrix verify that TPS54429ERSAT is sourced from the original manufacturer or authorized distributors?
All TPS54429ERSAT 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 TPS54429ERSAT meets industry standards.
7.What is the process for return or replacement of TPS54429ERSAT?
All TPS54429ERSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54429ERSAT, 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 TPS54429ERSAT part is unused and in its original packaging.
Return procedure for TPS54429ERSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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