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Texas Instruments TPS54429PWP
- Part No.:
- TPS54429PWP
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54429PWP.pdf
- Description:
- IC REG BUCK ADJ 4.5A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:244
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Product details
Overview
TPS54429PWP from Texas Instruments is a 4.5-A synchronous step-down (buck) 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. It employs D-CAP2™ adaptive on-time control for fast transient response in digital TV power supplies and networking terminal applications.
For engineers reviewing the TPS54429PWP datasheet, TPS54429PWP pinout, TPS54429PWP application, or TPS54429PWP equivalent, key selection considerations include its 700-kHz pseudo-fixed switching frequency, pre-biased soft-start capability, power-good open-drain output, and thermal design reliance on the exposed PowerPAD™ package for junction-to-board thermal resistance of 26.4°C/W.
Technical Context
The TPS54429PWP implements D-CAP2™ mode control using an adaptive on-time PWM architecture that eliminates external compensation while supporting ceramic and ultra-low-ESR output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VO, enabling stable operation across 7–18 V input with minimal output ripple.
It integrates dual current-sense paths for cycle-by-cycle over-current protection: valley detection during low-side conduction and temperature-compensated SW-to-PGND voltage monitoring. Protection features include non-latching thermal shutdown (165°C), output overvoltage (120% VO), undervoltage (65% VO), and UVLO based on VREG5 voltage (3.8 V typical wake-up threshold).
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 core logic rails in STB, Blu-ray players, and network terminals. |
| Switching Frequency | 700 kHz (pseudo-fixed) - enables compact magnetics and predictable EMI profile without oscillator component. |
| Integrated FETs | 63 mΩ HS / 55 mΩ LS - reduces conduction loss and simplifies layout vs. controller-only solutions. |
| VFB Accuracy | ±1.2% over –20°C to 85°C - ensures tight output regulation for sensitive SoC and FPGA I/O supplies. |
| Soft-Start Control | Adjustable via external capacitor - prevents inrush current and enables pre-biased startup without sinking output. |
| Power-Good Output | Open-drain PG with 1.7× soft-start delay - provides reliable system sequencing signal after regulation is established. |
| Shutdown Current | <10 μA - supports low-power standby modes in always-on consumer electronics. |
Pinout & Package
The TPS54429PWP is housed in a 14-pin HTSSOP package with exposed PowerPAD™ thermal pad (PWP designation), requiring soldering to PGND for thermal performance (θJB = 26.4°C/W). The package supports –20°C to 85°C ambient operation and RoHS-compliant NIPDAU finish (MSL Level-2-260°C-1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 1) | Output voltage node | Connects directly to output capacitor; used for on-time adjustment in D-CAP2™ loop. |
| VFB (Pin 2) | Feedback input | Senses regulated output via resistor divider; reference threshold is 765 mV ±1.2%. |
| VREG5 (Pin 3) | 5.5-V internal LDO output | Powers internal circuitry and can source up to 70 mA; requires 1-μF ceramic bypass to PGND. |
| SS (Pin 4) | Soft-start control | Charged by 2-μA internal current; sets ramp time and enables pre-biased startup behavior. |
| GND (Pin 5) | Signal ground reference | Reference for analog circuits; must be connected near PGND1/PGND2 for noise immunity. |
| PG (Pin 6) | Power-good indicator | Open-drain output active after 1.7× soft-start time when VO is within ±10% of target. |
| EN (Pin 7) | Enable input | Active-high logic control; EN < 0.48 V disables device and activates output discharge (50 Ω). |
| PGND1, PGND2 (Pins 8,9) | Power ground returns | Low-side FET source connections and current comparator inputs; must tie strongly to PowerPAD™. |
| SW1, SW2 (Pins 10,11) | Switch nodes | High-side drain / low-side source connection points; require short, low-inductance routing. |
| VBST (Pin 12) | Bootstrap supply | Drives high-side gate; requires 0.1-μF ceramic capacitor to respective SW pin. |
| VIN1, VIN2 (Pins 13,14) | Main input supply | Connect to 7–18 V source; dual pins reduce IR drop and improve current sharing. |
| PowerPAD™ (Backside) | Thermal & electrical ground | Exposed copper pad; must be soldered to PGND plane with ≥6 thermal vias for thermal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero-external-compensation design with fast load-transient response (<10 µs recovery) using ceramic output caps. |
| Pre-biased soft-start | Prevents reverse current flow during startup when output is already biased; avoids system reset or rail collapse. |
| Integrated 5.5-V VREG5 LDO | Self-powered internal bias rail; eliminates need for external bias supply and supports EN-controlled sequencing. |
| Cycle-by-cycle over-current protection | Valley-current sensing with temperature compensation ensures accurate current limiting across full temperature range. |
| Output discharge on disable | Internal 50-Ω MOSFET discharges VO to PGND when EN = low or fault occurs - critical for multi-rail sequencing. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature and restarts only after cooling by 30°C - prevents thermal runaway. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Provides 1.05-V, 4-A core voltage for broadcast demodulator SoCs with tight ripple and fast transient requirements. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable low-voltage rail with D-CAP2™-enabled sub-10-µs transient recovery. Use Value: Eliminates need for external compensation and large bulk capacitors, reducing BOM count and PCB area by >30% vs. voltage-mode controllers. |
Use Scenario: Generates 3.3-V auxiliary rail for Ethernet PHYs and USB controllers in residential gateways. IC Role / Device Role / Timing Role: Synchronous step-down converter with power-good signaling for coordinated system power-up. Use Value: Pre-biased soft-start prevents back-driving of powered-up peripherals during hot-plug events. |
| High Definition Blu-ray Disc™ Player | Digital Set Top Box (STB) |
Use Scenario: Supplies 1.8-V I/O voltage to video decoder ASICs under dynamic 0.5–4-A load steps. IC Role / Device Role / Timing Role: High-efficiency buck converter with integrated FETs and 700-kHz switching for compact heatsinkless design. Use Value: 63 mΩ/55 mΩ RDS(on) minimizes conduction loss, enabling >92% efficiency at 2-A load and 12-V input. |
Use Scenario: Delivers 2.5-V memory interface rail with strict ±2% tolerance and <20-mV ripple for DDR2/DDR3 subsystems. IC Role / Device Role / Timing Role: Precision-regulated synchronous buck with 765-mV bandgap reference and ±1.2% VFB accuracy. Use Value: Tight reference accuracy and low-noise feedback path ensure stable memory operation across –20°C to 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428PWP | Same 14-pin HTSSOP package and D-CAP2™ architecture, but rated for 4-A output (vs. 4.5-A); identical pinout and feature set. | Lower current rating limits use in 4.2–4.5-A peak-load scenarios like high-end STBs; otherwise drop-in for lower-power variants. | Select when 4-A maximum output suffices and cost optimization is prioritized over marginal headroom. |
| MP2315DJ-LF-Z | Monolithic 4.5-A buck with 4.5–28-V input, but uses constant-on-time (not D-CAP2™); 500-kHz fixed frequency; no VREG5 output. | Lacks integrated 5.5-V bias rail and pre-biased soft-start; requires external bias and separate sequencing logic for complex systems. | Choose for wider input range (up to 28 V) where VREG5 and pre-bias features are not required. |
Compared with TPS54429PWP, TPS54428PWP offers identical integration and layout compatibility at reduced current capacity, while MP2315DJ-LF-Z trades D-CAP2™'s transient performance and bias rail convenience for broader input voltage support and fixed-frequency predictability.
Availability
TPS54429PWP is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top boxes requiring stable component supply with full production lifecycle support.
Supply support for TPS54429PWP 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 TPS54429PWP belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for space-constrained, high-transient consumer electronics requiring minimal external components and robust protection.
FAQ
What is the maximum output current capability of the TPS54429PWP?
The TPS54429PWP is rated for 4.5-A continuous output current under recommended operating conditions (TA = –20°C to 85°C, proper thermal layout). Its cycle-by-cycle over-current limit triggers at 5.2–8.0 A depending on temperature and inductor value, providing headroom for short-term peaks. Derating applies above 85°C ambient or with insufficient PowerPAD™ thermal vias.
Does the TPS54429PWP support pre-biased output startup?
Yes, the TPS54429PWP includes proprietary pre-biased soft-start circuitry that prevents reverse current flow during startup when the output is already at a valid voltage. It achieves this by gradually enabling the low-side FET with narrow on-times until reaching normal duty-cycle operation - a key feature for hot-swap and multi-rail systems.
What package type and thermal requirements apply to the TPS54429PWP?
The TPS54429PWP uses a 14-pin HTSSOP package with exposed PowerPAD™ (PWP). The thermal pad must be soldered to a PGND plane with ≥6 thermal vias to achieve θJB = 26.4°C/W. Without proper pad connection, junction temperature rise exceeds safe limits under 4.5-A load, risking thermal shutdown.
Can the TPS54429PWP operate without external compensation components?
Yes, the TPS54429PWP uses D-CAP2™ adaptive on-time control, which eliminates the need for external compensation networks. Stability is maintained across ceramic, POSCAP, and SP-CAP output capacitors without loop compensation resistors or capacitors - reducing BOM count and layout complexity.
What is the function of the VREG5 pin on the TPS54429PWP?
The VREG5 pin on the TPS54429PWP delivers a regulated 5.5-V (±4%) output capable of sourcing up to 70 mA. It powers internal circuitry and can supply external bias for drivers or level-shifters. A 1-μF ceramic capacitor to PGND is mandatory; VREG5 is disabled when EN is low or VREG5 voltage falls below 3.8 V (UVLO threshold).
TPS54429PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
TPS54429PWP FAQ
1.How can I place an order for TPS54429PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54429PWP 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 TPS54429PWP reliable?
The price and inventory of TPS54429PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54429PWP is usually 5 days.
3.What payment methods are accepted for TPS54429PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54429PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54429PWP?
TPS54429PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54429PWP 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 TPS54429PWP?
For technical support, including TPS54429PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54429PWP requirements.
6.How does Aetrix verify that TPS54429PWP is sourced from the original manufacturer or authorized distributors?
All TPS54429PWP 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 TPS54429PWP meets industry standards.
7.What is the process for return or replacement of TPS54429PWP?
All TPS54429PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54429PWP, 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 TPS54429PWP part is unused and in its original packaging.
Return procedure for TPS54429PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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