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Texas Instruments TPS54426PWPR
- Part No.:
- TPS54426PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54426PWPR.pdf
- Description:
- IC REG BUCK ADJ 4A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,197
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Product details
Overview
TPS54426PWPR 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, D-CAP2™ adaptive on-time control, Eco-mode™ for light-load efficiency, and 700-kHz pseudo-fixed switching frequency. It delivers regulated output voltages from 0.76 V to 5.5 V across 4.5–18 V input, supporting digital TV power supplies and networking terminal designs.
For engineers reviewing the TPS54426PWPR datasheet, TPS54426PWPR pinout, TPS54426PWPR application, or TPS54426PWPR equivalent, key selection considerations include its HTSSOP-14 PowerPAD™ package thermal performance, cycle-by-cycle overcurrent protection, pre-biased soft-start capability, and compatibility with ultra-low-ESR ceramic output capacitors.
Technical Context
The TPS54426PWPR implements D-CAP2™ mode control-combining adaptive on-time PWM with internal ramp 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 4.5–18 V input while maintaining ~700 kHz switching frequency.
Eco-mode™ enables seamless transition from continuous conduction mode (CCM) at heavy loads to discontinuous conduction mode (DCM) at light loads, reducing quiescent current to <10 μA in shutdown and sustaining >90% efficiency at 10 mA output. Proprietary pre-biased soft-start prevents output sinking during startup by incrementally enabling low-side FET gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer input rails including 5 V, 12 V, and 15 V bus systems. |
| Output Current | 4 A continuous - sufficient for powering SoCs, FPGAs, and DDR memory subsystems in embedded applications. |
| Output Voltage Range | 0.76 V to 5.5 V - programmable via resistor divider; covers core logic (0.76–1.2 V), I/O (1.8–3.3 V), and analog (5 V) rails. |
| Switching Frequency | 700 kHz - fixed pseudo-constant frequency enables predictable EMI filtering and compact magnetics design. |
| High-Side RDS(on) | 65 mΩ - minimizes conduction loss at high duty cycles; optimized for lower-VOUT/VIN ratios. |
| Low-Side RDS(on) | 55 mΩ - reduces freewheeling losses and improves light-load efficiency in DCM operation. |
| Shutdown Current | <10 μA - enables ultra-low-power system standby states without external enable sequencing. |
| Power Good Accuracy | ±5% window (90% of target) - provides reliable rail monitoring for processor reset and system sequencing logic. |
Pinout & Package
The TPS54426PWPR is housed in a thermally enhanced 14-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad soldered to PGND for optimal heat dissipation. Junction-to-board thermal resistance is 36.4°C/W, enabling 4-A operation without forced airflow in typical PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 1) | Output voltage node | Connects directly to output capacitor; used for on-time adjustment and feedback sensing path. |
| VFB (Pin 2) | Feedback input | Monitors divided output voltage; sets regulation point with 0.765 V internal reference. |
| VREG5 (Pin 3) | 5.5 V LDO output | Supplies internal circuitry and can source up to 70 mA for external bias; requires 1 µF ceramic bypass. |
| 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 to minimize noise coupling. |
| PG (Pin 6) | Open-drain power good | Asserts high after 1.7× soft-start time when VOUT is within ±10%; requires external pull-up to VREG5. |
| EN (Pin 7) | Enable input | Active-high logic control; 2 V threshold ensures robust noise immunity in noisy environments. |
| PGND1, PGND2 (Pins 8,9) | Power ground returns | Low-side MOSFET source connections and current-sense comparator inputs; must tie directly to PowerPAD™. |
| SW1, SW2 (Pins 10,11) | Switch nodes | Drain-source junctions of internal FETs; high dv/dt nodes requiring minimized trace area and Kelvin routing. |
| VBST (Pin 12) | Bootstrap supply | Charges high-side gate driver via 0.1 µF ceramic capacitor to SW; internal diode connects to VREG5. |
| VIN1, VIN2 (Pins 13,14) | Main input supply | Connects to 4.5–18 V input rail; dual pins reduce IR drop and improve thermal distribution. |
| PowerPAD™ (Backside) | Thermal & electrical ground | Exposed copper pad soldered to PGND plane; mandatory for thermal performance and current return path. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Eliminates need for external compensation components while delivering sub-10-µs load transient response with ceramic output capacitors. |
| Eco-mode™ auto-skip operation | Maintains >85% efficiency at 10 mA load by entering DCM and disabling low-side FET when inductor current reaches zero. |
| Pre-biased soft-start | Prevents reverse current flow into pre-charged outputs by gradually increasing low-side FET on-time cycle-by-cycle. |
| Cycle-by-cycle overcurrent protection | Detects valley current during low-side conduction; limits peak inductor current to 4.7–7.5 A depending on temperature. |
| Integrated 5.5 V VREG5 regulator | Provides clean internal bias and up to 70 mA for external circuitry; includes UVLO (3.8 V threshold) and line/load regulation ≤100 mV. |
| PowerPAD™ thermal package | Reduces θJB to 36.4°C/W; enables full 4-A output in ambient temperatures up to 85°C with standard 2-layer PCB. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers main SoC, video decoder, and HDMI interface in 4K UHD television platforms with strict standby power requirements. IC Role / Device Role / Timing Role: Primary buck regulator generating 1.1 V core and 3.3 V I/O rails from 12 V input; manages dynamic load steps during video frame transitions. Use Value: Eco-mode™ reduces no-load consumption to <10 μA, meeting Energy Star Tier 2 standby limits; D-CAP2™ eliminates output capacitor derating for transient compliance. | Use Scenario: Supplies FPGA, PHY, and memory in residential gateways and DSL/cable modems operating continuously under variable network traffic. IC Role / Device Role / Timing Role: Main 1.2 V/3 A and 3.3 V/2 A power stage; handles bursty Ethernet packet processing loads with <50 mV undershoot. Use Value: 700-kHz switching enables small 22 µH inductors and 22 µF ceramic output caps; PowerPAD™ allows convection-only cooling in sealed enclosures. |
| High Definition Blu-ray Disc™ Player | Digital Set Top Box (STB) |
Use Scenario: Regulates laser diode driver, servo controller, and MPEG decoder in optical disc players with rapid power-state transitions. IC Role / Device Role / Timing Role: Dual-rail converter (1.8 V + 5 V) managing deep-sleep wake-up sequences and real-time playback modes. Use Value: Pre-biased soft-start prevents voltage collapse during cold boot from partially charged backup capacitors; PG signal synchronizes firmware initialization. | Use Scenario: Delivers stable 1.05 V, 1.8 V, and 3.3 V rails to multi-core ARM processors and tuners in cable/satellite receivers with 24/7 operation. IC Role / Device Role / Timing Role: High-efficiency primary converter handling 0.1–4 A dynamic loads; coordinates with PMIC for power sequencing. Use Value: 65 mΩ/55 mΩ FETs sustain >92% peak efficiency at 3.3 V/2 A; thermal design supports 85°C ambient without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428PWPR | Same D-CAP2™ architecture but with 2.5-A rating, lower RDS(on) (45 mΩ/35 mΩ), and 1.5-MHz switching frequency. | Better suited for space-constrained designs needing higher frequency and lower current; lacks VREG5 output. | Select TPS54428PWPR only if output current ≤2.5 A and board layout favors smaller inductors/caps. |
| LM26420QSQX/NOPB | Dual-output (2×2.5 A), current-mode control, 600-kHz fixed frequency, no Eco-mode™, separate VREF output instead of VREG5. | Designed for dual-rail systems like DDR memory termination; requires external compensation and has higher light-load quiescent current (~200 μA). | Choose LM26420QSQX/NOPB when two independent regulated outputs are required and D-CAP2™ transient speed is not critical. |
Compared with TPS54426PWPR, the TPS54428PWPR offers higher switching frequency and lower RDS(on) but reduced current capability and no integrated 5.5 V bias rail, while the LM26420QSQX/NOPB provides dual outputs at the cost of added complexity, lower light-load efficiency, and absence of pre-biased soft-start.
Availability
TPS54426PWPR is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, HD Blu-ray Disc™ players, and digital set-top boxes requiring stable component supply, long-term production continuity, and automotive-grade reliability screening.
Supply support for TPS54426PWPR 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 and automotive-grade reliability.
The TPS54426PWPR belongs to TI's SWIFT™ synchronous buck converter product line, engineered for high-density, low-noise power delivery in consumer electronics where fast transient response, light-load efficiency, and minimal external component count are critical.
FAQ
What is the maximum output current supported by the TPS54426PWPR?
The TPS54426PWPR supports up to 4 A of continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its cycle-by-cycle overcurrent protection triggers at 4.7–7.5 A depending on junction temperature, and thermal shutdown activates at 165°C to prevent damage. Derating is required above 85°C ambient.
Does the TPS54426PWPR require external compensation components?
No, the TPS54426PWPR uses D-CAP2™ adaptive on-time control, which eliminates the need for external compensation components such as type-II or type-III error amplifier networks. Stability is achieved internally through a proprietary ramp-compensation scheme compatible with ceramic and polymer output capacitors.
How does Eco-mode™ improve light-load efficiency in the TPS54426PWPR?
Eco-mode™ in the TPS54426PWPR enables automatic transition from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) as load decreases. It disables the low-side FET when inductor current reaches zero, reducing switching losses and achieving <10 μA shutdown current and >85% efficiency at 10 mA output.
Can the TPS54426PWPR safely start up into a pre-biased output?
Yes, the TPS54426PWPR features proprietary pre-biased soft-start that prevents reverse current flow during startup. When the output voltage exceeds the soft-start command level, it incrementally increases low-side FET on-time cycle-by-cycle until reaching normal regulation, ensuring smooth ramp-up without discharging the pre-biased rail.
What is the role of the VREG5 pin on the TPS54426PWPR?
The VREG5 pin on the TPS54426PWPR provides a regulated 5.5 V output (±0.2 V) derived from the input supply, capable of sourcing up to 70 mA. It powers internal circuitry and can bias external components; it must be decoupled with a 1 µF ceramic capacitor to GND and is disabled when EN is low.
TPS54426PWPR 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):
- 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
TPS54426PWPR FAQ
1.How can I place an order for TPS54426PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54426PWPR 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 TPS54426PWPR reliable?
The price and inventory of TPS54426PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54426PWPR is usually 5 days.
3.What payment methods are accepted for TPS54426PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54426PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54426PWPR?
TPS54426PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54426PWPR 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 TPS54426PWPR?
For technical support, including TPS54426PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54426PWPR requirements.
6.How does Aetrix verify that TPS54426PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54426PWPR 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 TPS54426PWPR meets industry standards.
7.What is the process for return or replacement of TPS54426PWPR?
All TPS54426PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54426PWPR, 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 TPS54426PWPR part is unused and in its original packaging.
Return procedure for TPS54426PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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