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Texas Instruments TPS54425PWPR
- Part No.:
- TPS54425PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54425PWPR.pdf
- Description:
- IC REG BUCK ADJ 4A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,660
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Product details
Overview
TPS54425PWPR from Texas Instruments is a 4-A synchronous step-down DC/DC converter with integrated high-side (65 mΩ) and low-side (55 mΩ) N-channel MOSFETs, operating from 4.5 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 delivers fast transient response for digital TV power supplies and networking terminal applications.
For engineers reviewing the TPS54425PWPR datasheet, TPS54425PWPR pinout, TPS54425PWPR application, or TPS54425PWPR equivalent, key selection considerations include its 700-kHz pseudo-fixed switching frequency, pre-biased soft-start capability, power-good open-drain output, and thermal shutdown at 165°C with 30°C hysteresis.
Technical Context
The TPS54425PWPR implements D-CAP2™ adaptive on-time control, combining constant on-time operation with internal ripple-simulation circuitry to eliminate dependency on output capacitor ESR-enabling stable regulation with ceramic capacitors. Its control loop requires no external compensation components.
It integrates dual N-channel MOSFETs with verified on-resistances of 65 mΩ (high-side) and 55 mΩ (low-side), supports cycle-by-cycle overcurrent protection via valley-current sensing on PGND pins, and features independent UVLO monitoring of the internal 5.5-V VREG5 rail with 3.8-V wake-up threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V - supports wide-input industrial and consumer power rails without external pre-regulation. |
| IOUT Max | 4 A continuous - sufficient for core logic rails in STB, Blu-ray, and networking SoC applications. |
| VOUT Range | 0.76 V to 5.5 V - programmable via resistor divider; enables direct generation of DDR termination, CPU core, or I/O supply voltages. |
| fSW | 700 kHz nominal - fixed-frequency behavior simplifies EMI filtering while maintaining compact magnetics. |
| Shutdown IQ | <10 μA - enables ultra-low-power standby in always-on consumer electronics. |
| Thermal Shutdown | 165°C with 30°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| VREG5 Output | 5.5 V ±0.2 V, 70 mA capable - powers external bias circuitry or level-shifters without auxiliary LDO. |
Pinout & Package
TPS54425PWPR uses the 14-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad soldered to PGND for enhanced thermal dissipation (θJCbot = 4.3°C/W). The package is RoHS-compliant, NIPDAU-finished, and rated MSL-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 1) | Output voltage node | Direct connection to output LC filter; used for on-time adjustment and feedback reference point. |
| VFB (Pin 2) | Feedback input | Monitors resistor-divider output voltage; internal 0.765-V reference sets regulation accuracy. |
| VREG5 (Pin 3) | Internal 5.5-V regulator output | Provides bias for internal circuitry and external loads; requires 1-μF ceramic capacitor to PGND. |
| SS (Pin 4) | Soft-start control | 2-μA current source charges external capacitor; enables adjustable ramp time and pre-biased startup. |
| GND (Pin 5) | Signal ground | Reference for analog circuits; must be star-connected to PGND near IC for noise immunity. |
| PG (Pin 6) | Power-good open-drain output | Asserts high after 1.7× soft-start time 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; enables/disables converter and discharges output via internal 50-Ω FET. |
| PGND1, PGND2 (Pins 8,9) | Power ground returns | Low-side MOSFET source connections and current-sense inputs; must be tied directly to PowerPAD™. |
| SW1, SW2 (Pins 10,11) | Switch nodes | Drain-source junctions of internal FETs; connect to inductor; require tight layout to minimize ringing. |
| VBST (Pin 12) | Bootstrap supply | Charged via internal diode from VREG5; drives high-side gate; requires 0.1-μF ceramic cap to SW1/SW2. |
| VIN2, VIN1 (Pins 13,14) | Main input supply | High-side FET drain and internal LDO input; accept 4.5–18 V; require local 10-μF ceramic decoupling. |
| PowerPAD™ (Backside) | Thermal & electrical ground | Must be soldered to PGND plane with ≥6 thermal vias; primary path for heat removal and current return. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero-external-compensation design and stable operation with ceramic output capacitors as low as 22 μF. |
| Pre-biased soft-start | Prevents reverse current flow during startup when output is pre-charged; ensures monotonic VO ramp without sinking load. |
| Integrated 5.5-V VREG5 LDO | Eliminates need for external bias supply; sources up to 70 mA for gate drivers or auxiliary circuitry. |
| Cycle-by-cycle overcurrent protection | Detects valley current on PGND pins; non-latching shutdown prevents lockup during momentary overload. |
| Output discharge on disable | Activates internal 50-Ω MOSFET from VO to PGND when EN = low, ensuring rapid output collapse for sequencing. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers SoC core, memory, and video processing rails in flat-panel TV mainboards. IC Role / Device Role / Timing Role: Primary 1.05-V/3.3-V buck regulator delivering 4-A peak current with <50-mV output ripple. Use Value: D-CAP2™ fast transient response maintains regulation during burst-mode video decoding without bulk electrolytic capacitors. | Use Scenario: Supplies HDMI PHY, laser driver, and BD-ROM controller in optical disc players. IC Role / Device Role / Timing Role: Synchronous buck converter generating 1.2-V core and 3.3-V I/O rails from 12-V input. Use Value: Pre-biased soft-start prevents bus contention during hot-plug insertion of external peripherals. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Regulates processor, Ethernet PHY, and Wi-Fi module supplies in residential gateways. IC Role / Device Role / Timing Role: High-efficiency 4-A step-down converter supporting dynamic voltage scaling for ARM-based SoCs. Use Value: 700-kHz switching frequency balances EMI compliance and inductor size for compact PCB layouts. | Use Scenario: Delivers stable 1.1-V CPU core and 1.8-V DDR interface voltages in cable/satellite receivers. IC Role / Device Role / Timing Role: Main DC/DC regulator with power-good signaling for system reset coordination. Use Value: Open-drain PG output interfaces directly with FPGA or microcontroller reset controllers for sequenced power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54325PWPR | 3-A output rating; identical D-CAP2™ control, package, and pinout; lower RDS(on) (60 mΩ/50 mΩ). | Suitable where peak load current ≤3 A; reduces conduction loss but limits headroom for future power scaling. | Select when cost-sensitive designs tolerate 25% lower current margin and benefit from slightly higher efficiency at light loads. |
| MP2342DJ-LF-Z | 4-A rating, 500-kHz fixed frequency, current-mode control; QFN-10 package; no VREG5 or PG output. | Lacks integrated bias rail and power-good signaling; requires external 5-V supply and sequencing logic. | Choose for space-constrained layouts needing smaller footprint, accepting added BOM complexity for bias and monitoring. |
Compared with TPS54425PWPR, TPS54325PWPR offers identical feature set at reduced current capacity, while MP2342DJ-LF-Z trades integration (no VREG5/PG) for smaller QFN packaging-making TPS54425PWPR optimal for full-feature, thermally demanding 4-A applications requiring minimal external components.
Availability
TPS54425PWPR is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player subsystems, and networking home terminals requiring stable component supply across production lifecycles.
Supply support for TPS54425PWPR 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 TPS544xx family was designed specifically for cost-sensitive, high-density consumer and networking applications requiring fast transient response, low ESR capacitor compatibility, and integrated power stages-exemplified by the TPS54425PWPR's D-CAP2™ architecture and PowerPAD™ thermal performance.
FAQ
What is the maximum output current supported by the TPS54425PWPR?
The TPS54425PWPR supports up to 4 A of continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Peak current capability depends on input/output voltage, duty cycle, and thermal management; the device includes cycle-by-cycle overcurrent protection that triggers at 4.7–7.5 A depending on temperature and test conditions.
Does the TPS54425PWPR require external compensation components?
No, the TPS54425PWPR does not require external compensation components. Its D-CAP2™ adaptive on-time control architecture provides inherent stability with ceramic output capacitors, eliminating the need for type-II or type-III compensation networks typically required in voltage-mode or current-mode controllers.
How does the pre-biased soft-start function work in the TPS54425PWPR?
The TPS54425PWPR initiates pre-biased soft-start by detecting when the feedback voltage (VFB) exceeds the internal soft-start reference. It then gradually increases low-side FET on-time cycle-by-cycle until reaching normal regulation, preventing reverse current flow into a pre-charged output and ensuring monotonic voltage ramp-up without load sinking.
What is the role of the VREG5 pin on the TPS54425PWPR?
The VREG5 pin on the TPS54425PWPR outputs a regulated 5.5-V supply derived from VIN, capable of sourcing up to 70 mA. It powers internal circuitry and can be used externally for gate drivers or biasing. A 1-μF ceramic capacitor to PGND is mandatory; VREG5 must exceed 3.8 V for the TPS54425PWPR to operate.
Can the TPS54425PWPR safely discharge its output when disabled?
Yes, the TPS54425PWPR actively discharges its output when disabled via EN = low or protection activation. An internal 50-Ω MOSFET connects VO to PGND, collapsing the output voltage rapidly. This feature supports precise power sequencing and prevents floating rails in multi-rail systems.
TPS54425PWPR 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):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
TPS54425PWPR FAQ
1.How can I place an order for TPS54425PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54425PWPR 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 TPS54425PWPR reliable?
The price and inventory of TPS54425PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54425PWPR is usually 5 days.
3.What payment methods are accepted for TPS54425PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54425PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54425PWPR?
TPS54425PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54425PWPR 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 TPS54425PWPR?
For technical support, including TPS54425PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54425PWPR requirements.
6.How does Aetrix verify that TPS54425PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54425PWPR 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 TPS54425PWPR meets industry standards.
7.What is the process for return or replacement of TPS54425PWPR?
All TPS54425PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54425PWPR, 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 TPS54425PWPR part is unused and in its original packaging.
Return procedure for TPS54425PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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