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Texas Instruments TPS54426RSAT
- Part No.:
- TPS54426RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54426RSAT.pdf
- Description:
- IC REG BUCK ADJ 4A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:807
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Product details
Overview
TPS54426RSAT 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 operates from 4.5 V to 18 V input and delivers adjustable output from 0.76 V to 5.5 V - used in digital TV power supplies, Blu-ray players, and networking terminals.
For engineers reviewing the TPS54426RSAT datasheet, TPS54426RSAT pinout, TPS54426RSAT application, or TPS54426RSAT equivalent, key selection considerations include its QFN-16 package thermal performance (θJA = 37.3°C/W), pre-biased soft-start capability, cycle-by-cycle overcurrent protection, and compatibility with ultra-low-ESR ceramic output capacitors.
Technical Context
The TPS54426RSAT 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 pseudo-constant frequency.
Eco-mode™ enables seamless transition from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) at light loads, reducing switching losses and achieving <10 μA shutdown current. The device integrates VREG5 (5.5 V ±0.2 V, 70 mA capable), power-good (PG) 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 | 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 FPGAs, SoCs, and DDR memory subsystems in embedded applications. |
| Switching Frequency | 700 kHz (pseudo-fixed) - balances EMI performance, inductor size, and efficiency in compact layouts. |
| High-Side RDS(on) | 65 mΩ @ 25°C - minimizes conduction loss during high-duty-cycle operation (e.g., 3.3 V out from 12 V in). |
| Low-Side RDS(on) | 55 mΩ @ 25°C - reduces rectification loss and improves light-load efficiency in DCM operation. |
| VFB Reference Accuracy | ±1% over –40°C to 85°C - ensures tight output regulation across temperature for precision analog and digital loads. |
| Thermal Resistance θJA | 37.3°C/W (QFN-16) - enables higher power density than HTSSOP-14 (55.6°C/W) with proper PCB thermal vias. |
Pinout & Package
TPS54426RSAT is housed in a 16-pin Plastic Quad Flat Pack (QFN) with exposed thermal pad (PowerPAD™), optimized for thermal dissipation in space-constrained designs. The package measures 4 mm × 4 mm × 0.9 mm and requires soldering of the thermal pad to PGND for rated performance.
| 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 via resistor divider. |
| VFB (Pin 1) | Feedback input | Senses regulated output via resistor divider; reference voltage is 0.765 V with ±1% accuracy over temperature. |
| VREG5 (Pin 2) | Internal 5.5-V regulator output | Provides bias for internal circuitry and can source up to 70 mA for external use; requires 1-μF ceramic bypass to PGND. |
| SS (Pin 3) | Soft-start control | Charged by internal 2-μA current source; enables adjustable startup ramp and prevents inrush into pre-biased outputs. |
| GND (Pin 4) | Signal ground | Reference for analog circuits; must be connected to PGND at single point near IC to avoid noise coupling. |
| PG (Pin 5) | 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 6) | Enable input | Active-high logic control; threshold is 2 V (min); pulls down to disable device and activate 50-Ω output discharge path. |
| VIN1/VIN2 (Pins 13,14,15) | Main input supply | Dual VIN pins reduce IR drop and improve current sharing; connect directly to bulk input capacitor with low-inductance path. |
| VBST (Pin 12) | Bootstrap supply | Drives high-side gate; requires 0.1-μF ceramic capacitor between VBST and SW1/SW2 for proper bootstrap charging. |
| SW1/SW2 (Pins 9,10,11) | Switch node connections | Connect to external inductor; SW1/SW2 are paralleled internally - layout must minimize loop area to reduce EMI. |
| PGND1/PGND2 (Pins 7,8) | Power ground returns | Low-side MOSFET source nodes and current-sense inputs; must be tied solidly to thermal pad and input/output capacitors. |
| PowerPAD™ (Back side) | Thermal and electrical ground | Exposed copper pad; must be soldered to PGND plane with ≥6 thermal vias (0.3-mm diameter) for θJA = 37.3°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero external compensation, fast load-transient response (<10 μs recovery), and stability with ceramic output capacitors. |
| Auto-Skip Eco-mode™ | Reduces light-load quiescent current to <10 μA and maintains >85% efficiency at 10 mA output - critical for always-on systems. |
| Pre-biased soft start | Prevents reverse current flow during startup into pre-charged outputs by incrementally enabling low-side FET gate drive. |
| Cycle-by-cycle overcurrent protection | Detects valley current in low-side FET using temperature-compensated voltage sensing - non-latching, with 4.7–7.5 A trip range. |
| Integrated VREG5 and power-good | VREG5 provides 5.5 V ±0.2 V for internal logic and external bias; PG output enables system sequencing with 5-μs fault response. |
Applications
| Digital TV Power Supply | Blu-ray Disc™ Player |
|---|---|
|
Use Scenario: Powers main SoC, video decoder, and HDMI interface from 12 V rail. IC Role / Device Role / Timing Role: Primary 1.2-V/3-A buck regulator with fast transient response to handle burst video decoding loads. Use Value: D-CAP2™ control eliminates need for external compensation, reducing BOM count and board area by >30% vs. voltage-mode controllers. |
Use Scenario: Supplies 3.3 V and 1.8 V rails to optical pickup controller and NAND flash memory. IC Role / Device Role / Timing Role: Dual-rail support via separate feedback networks; Eco-mode™ extends standby battery life in portable models. Use Value: Pre-biased soft start prevents voltage droop on shared 3.3 V bus during disc spin-up, avoiding system reset. |
| Networking Home Terminal | Digital Set Top Box (STB) |
|
Use Scenario: Delivers 1.05 V to Ethernet PHY and 5 V to USB ports in residential gateway devices. IC Role / Device Role / Timing Role: High-efficiency 4-A regulator handling dynamic packet-processing loads with minimal thermal derating. Use Value: QFN-16 package with PowerPAD™ achieves 37.3°C/W θJA, enabling fanless operation in sealed enclosures. |
Use Scenario: Generates 1.2 V for ARM-based media processor and 3.3 V for tuner front-end in cable/satellite receivers. IC Role / Device Role / Timing Role: Output discharge function safely discharges 1.2 V rail during power-off to meet safety standards. Use Value: Integrated 50-Ω discharge MOSFET eliminates need for external circuitry, reducing component count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428RSAT | Same QFN-16 package and pinout; adds programmable current limit (3–6 A) and enhanced UVLO hysteresis. | Preferred for designs requiring adjustable OCP threshold or tighter input undervoltage control. | Select TPS54428RSAT if OCP tuning or robust cold-start behavior under low-VIN conditions is required. |
| MP2315GJ-Z | Monolithic 4-A buck with 4.5–28 V input, but uses voltage-mode control (requires external compensation) and lacks Eco-mode™. | Better suited for high-input-voltage industrial applications where 18 V max is insufficient. | Choose MP2315GJ-Z only when input exceeds 18 V or when design team prefers traditional voltage-mode loop tuning. |
Compared with TPS54426RSAT, TPS54428RSAT offers field-programmable OCP and improved UVLO behavior while maintaining pin compatibility, whereas MP2315GJ-Z trades Eco-mode™ efficiency and D-CAP2™ simplicity for wider input range and voltage-mode flexibility - making TPS54426RSAT optimal for cost-sensitive, thermally constrained consumer electronics.
Availability
TPS54426RSAT is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player subsystems, and networking home terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54426RSAT 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 TPS544xx family was designed specifically for high-density, low-noise point-of-load regulation in consumer electronics - emphasizing fast transient response, light-load efficiency, and minimal external component count.
FAQ
What is the maximum recommended output current for TPS54426RSAT in continuous operation?
The TPS54426RSAT is rated for 4 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its current limit threshold ranges from 4.7 A to 7.5 A depending on temperature and test conditions, but sustained operation above 4 A requires careful thermal management using the exposed PowerPAD™ and ≥6 thermal vias to maintain junction temperature below 150°C.
Does TPS54426RSAT support pre-biased output startup?
Yes, the TPS54426RSAT includes proprietary pre-biased soft-start circuitry that prevents reverse current flow during startup. When the output voltage is already present before enable, the controller incrementally activates the low-side FET gate drive on a cycle-by-cycle basis until full duty-cycle operation is reached - ensuring smooth, safe ramp-up without sinking current from the pre-charged rail.
What is the purpose of the VREG5 pin on TPS54426RSAT?
The VREG5 pin on TPS54426RSAT provides a regulated 5.5 V ±0.2 V output capable of sourcing up to 70 mA. It powers internal control circuitry and can also supply external bias for level-shifters, supervisors, or optocouplers. A 1-μF ceramic capacitor must be placed between VREG5 and PGND; the pin is disabled when EN is low, and its voltage must exceed 3.8 V for normal operation.
How does Eco-mode™ improve light-load efficiency in TPS54426RSAT?
Eco-mode™ in the TPS54426RSAT enables automatic transition from continuous conduction mode (CCM) to discontinuous conduction mode (DCM) as load decreases. By skipping switching cycles and reducing gate drive activity, it lowers quiescent current to <10 μA in shutdown and maintains >85% efficiency at 10 mA output - significantly extending battery life or reducing no-load power in always-on consumer devices.
Can TPS54426RSAT operate with ceramic output capacitors only?
Yes, the TPS54426RSAT is explicitly designed for use with ultra-low-ESR ceramic output capacitors (e.g., X5R/X7R 22–68 μF). Its D-CAP2™ control architecture eliminates reliance on ESR-induced ripple for loop stability, unlike traditional voltage-mode controllers. TI recommends two parallel 22-μF ceramics (e.g., TDK C3216X5R0J226M) for optimal transient response and ripple suppression at 4-A load.
TPS54426RSAT 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):
- 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:
- 16-QFN (4x4)
TPS54426RSAT FAQ
1.How can I place an order for TPS54426RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54426RSAT 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 TPS54426RSAT reliable?
The price and inventory of TPS54426RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54426RSAT is usually 5 days.
3.What payment methods are accepted for TPS54426RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54426RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54426RSAT?
TPS54426RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54426RSAT 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 TPS54426RSAT?
For technical support, including TPS54426RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54426RSAT requirements.
6.How does Aetrix verify that TPS54426RSAT is sourced from the original manufacturer or authorized distributors?
All TPS54426RSAT 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 TPS54426RSAT meets industry standards.
7.What is the process for return or replacement of TPS54426RSAT?
All TPS54426RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54426RSAT, 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 TPS54426RSAT part is unused and in its original packaging.
Return procedure for TPS54426RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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