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Texas Instruments TPS54426RSAR
- Part No.:
- TPS54426RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54426RSAR.pdf
- Description:
- IC REG BUCK ADJ 4A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,764
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Product details
Overview
TPS54426RSAR from Texas Instruments is a 4-A synchronous step-down DC/DC converter with integrated 65 mΩ high-side and 55 mΩ low-side N-channel MOSFETs, D-CAP2™ adaptive on-time control, and Auto-Skip Eco-mode™ for light-load efficiency. It operates from 4.5 V to 18 V input, delivers 0.76 V to 5.5 V output, and runs at 700 kHz switching frequency-used in digital TV power supplies and Blu-ray disc player voltage regulation.
For engineers reviewing the TPS54426RSAR datasheet, TPS54426RSAR pinout, TPS54426RSAR application, or TPS54426RSAR equivalent, key selection criteria include its QFN-16 package thermal performance (θJCbot = 4.9 °C/W), cycle-by-cycle overcurrent protection, pre-biased soft-start capability, and compatibility with ultra-low-ESR ceramic output capacitors without external compensation.
Technical Context
The TPS54426RSAR implements D-CAP2™ mode control, combining adaptive on-time PWM with internal ramp compensation to achieve fast transient response and stability with ceramic output capacitors-no external loop compensation required. Its on-time is inversely proportional to VIN and proportional to VOUT, enabling pseudo-constant 700 kHz operation across input and load variations.
Eco-mode™ enables seamless transition from PWM to pulse-frequency modulation at light loads, reducing quiescent current to <10 μA in shutdown and maintaining >85% efficiency at 10 mA output. Proprietary pre-biased soft-start prevents reverse current flow during startup when VO is pre-charged.
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 video applications. |
| Switching Frequency | 700 kHz - enables compact magnetics and EMI filtering while balancing efficiency and thermal performance. |
| FET RDS(on) | 65 mΩ (HS) / 55 mΩ (LS) - optimized for lower duty-cycle operation, minimizing conduction loss at typical 1.05–3.3 V outputs. |
| Soft Start | Adjustable via external capacitor - allows controlled inrush current limiting and sequencing with other rails. |
| Power Good Output | Open-drain PG with ±5% accuracy - provides system-level reset and sequencing signaling after 1.7× soft-start time. |
| Thermal Protection | 165 °C shutdown with 30 °C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking. |
Pinout & Package
The TPS54426RSAR is housed in a 16-pin QFN package (RSA) with an exposed thermal pad (PowerPAD™) soldered to PGND for optimal heat dissipation (θJCbot = 4.9 °C/W, θJB = 14.9 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 16) | Output voltage node | Connects directly to output capacitor and feedback divider; used for on-time adjustment in D-CAP2™ control. |
| VFB (Pin 1) | Feedback input | Senses regulated output via resistor divider; reference voltage is 0.765 V with ±1.5 mV accuracy over temperature. |
| VREG5 (Pin 2) | 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 3) | Soft-start control | Charged by 2 µA internal current; sets ramp time and enables pre-biased startup without sinking output current. |
| GND (Pin 4) | Signal ground | Reference for analog circuits; must be connected to PGND near device with low-inductance path. |
| PG (Pin 5) | Power good indicator | Open-drain output active after soft-start; sinks 5 mA max when pulled low during fault conditions. |
| EN (Pin 6) | Enable input | Active-high logic control; 2 V threshold ensures robust noise immunity in noisy environments. |
| PGND1/PGND2 (Pins 7,8) | Power ground returns | Low-side MOSFET source connections and current-sense reference points; must tie to thermal pad. |
| SW1/SW2 (Pins 9,10,11) | Switch nodes | High-side drain / low-side source junctions; drive external inductor; require tight layout to minimize ringing. |
| VBST (Pin 12) | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1 µF ceramic capacitor to respective SW pin. |
| VIN1/VIN2/VIN3 (Pins 13,14,15) | Main input supply | Distributed input pins reduce IR drop and improve current sharing into internal FETs and VREG5 LDO. |
| PowerPAD™ (Back side) | Thermal & electrical ground | Must be soldered to PGND plane with ≥6 thermal vias; primary path for heat removal and low-impedance return. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables <10 µs load transient response with zero external compensation components-ideal for dynamic SoC core rails. |
| Auto-Skip Eco-mode™ | Reduces light-load quiescent current to <10 µA and maintains >88% efficiency at 10 mA output-extends battery life in standby modes. |
| Pre-biased soft start | Prevents reverse current flow during startup when output is pre-charged-critical for hot-swap and multi-rail sequencing. |
| Cycle-by-cycle overcurrent protection | Monitors low-side FET voltage during conduction; trips within one switching cycle to protect against short-circuit faults. |
| Integrated 5.5 V LDO (VREG5) | Provides clean bias for internal logic and external circuitry; eliminates need for separate 5 V rail in cost-sensitive designs. |
Applications
| Digital TV Power Supply | Blu-ray Disc Player |
|---|---|
Use Scenario: Powers main SoC, video decoder, and HDMI interface in 4K UHD television platforms with variable load profiles. IC Role / Device Role / Timing Role: Primary 1.05 V/3.3 V buck regulator delivering 4 A peak current with fast transient response to handle burst video processing. Use Value: D-CAP2™ control reduces output capacitance by 40% vs. traditional voltage-mode controllers-cutting BOM cost and board area. | Use Scenario: Supplies regulated 1.2 V core and 3.3 V I/O rails for BD-ROM controller and audio DSP in portable Blu-ray players. IC Role / Device Role / Timing Role: Synchronous buck converter with Eco-mode™ enabling >90% efficiency at 50 mA playback idle current. Use Value: Pre-biased soft start avoids output voltage droop during disc spin-up, ensuring uninterrupted audio/video decoding. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Provides stable 1.8 V and 2.5 V rails for cable modem PHY, Wi-Fi SoC, and Ethernet MAC in residential gateways. IC Role / Device Role / Timing Role: Dual-output capable via external feedback configuration; handles rapid load steps from packet bursts and RF transmission. Use Value: 700 kHz switching frequency allows use of small 22 µH inductors and 22 µF ceramic capacitors-reducing solution size by 35%. | Use Scenario: Delivers 1.05 V core and 1.8 V memory rails for STB application processors and DDR2/3 interfaces under varying channel decode loads. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with power-good signaling for system reset coordination and firmware boot validation. Use Value: Integrated VREG5 powers external level shifters and I²C peripherals-eliminating a discrete 5 V LDO and saving 2 mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428RSAR | Same QFN-16 package, 4.5–18 V input, but supports 0.6–5.5 V output and includes adjustable current limit (4–6 A range). | Preferred for designs requiring tighter output voltage tolerance (<±0.5%) or programmable OCP threshold. | Select TPS54428RSAR when output accuracy or configurable protection is prioritized over minimal BOM count. |
| MP2342GQ-Z | Monolithic 4 A buck in QFN-16, 4.5–18 V input, 0.8–5.5 V output, but uses constant-on-time control without Eco-mode™ and lacks pre-biased soft start. | Suitable for cost-sensitive industrial controls where light-load efficiency is secondary to footprint and price. | Choose MP2342GQ-Z only if Eco-mode™ and pre-bias startup are not required and TI second-sourcing is not mandated. |
Compared with TPS54426RSAR, TPS54428RSAR offers enhanced output accuracy and programmable OCP but identical thermal and layout behavior; MP2342GQ-Z trades light-load efficiency and startup robustness for lower unit cost and non-TI sourcing flexibility.
Availability
TPS54426RSAR is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray disc players, networking home terminals, and digital set-top boxes requiring stable component supply and long-term production continuity.
Supply support for TPS54426RSAR 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions since 1930.
The TPS54426RSAR belongs to TI's SWIFT™ family of high-efficiency DC/DC converters, engineered specifically for space-constrained consumer electronics requiring fast transient response, low ESR capacitor compatibility, and seamless light-to-heavy load efficiency scaling.
FAQ
What is the recommended input capacitor configuration for the TPS54426RSAR?
The TPS54426RSAR requires a minimum 10 µF ceramic input decoupling capacitor placed close to VIN pins, plus a 0.1 µF capacitor from Pin 14 (VIN2) to PGND to stabilize overcurrent detection. For high-current applications, add bulk capacitance (e.g., 47–100 µF tantalum or polymer) to limit input ripple below 50 mV peak-to-peak. All capacitors must have voltage ratings exceeding the maximum VIN (18 V).
Does the TPS54426RSAR support output voltages below 0.76 V?
No, the TPS54426RSAR has a fixed internal reference of 0.765 V with ±1.5 mV accuracy, and its feedback architecture supports output voltages only from 0.76 V to 5.5 V. Attempting to set lower outputs using external resistor dividers violates the minimum VFB specification and causes regulation failure. For sub-0.76 V operation, consider the TPS54429E or TPS544C20.
How does the TPS54426RSAR handle pre-biased outputs during startup?
The TPS54426RSAR implements proprietary pre-biased soft start: when VO exceeds the initial VFB target, it gradually increases low-side FET on-time cycle-by-cycle instead of forcing immediate full conduction. This prevents reverse current flow from the output into the converter, avoiding voltage droop and potential damage to downstream circuitry. The function is automatic and requires no external components.
What is the thermal performance difference between the TPS54426RSAR and the PWP-package TPS54426PWP?
The TPS54426RSAR (QFN-16) achieves θJB = 14.9 °C/W and θJCbot = 4.9 °C/W, significantly better than the TPS54426PWP (HTSSOP-14) with θJB = 36.4 °C/W and θJCbot = 4.3 °C/W. The RSA package's exposed thermal pad and bottom-side copper connection enable ~60% lower junction-to-board resistance, allowing 1.8× higher continuous output current under identical PCB layout and airflow conditions.
Can the TPS54426RSAR be synchronized to an external clock?
No, the TPS54426RSAR does not support external clock synchronization. Its 700 kHz switching frequency is derived solely from adaptive on-time control based on VIN and VOUT, with no SYNC pin or frequency programming capability. For synchronizable alternatives, consider the TPS54429E (supports 300–2000 kHz sync) or LM27403 (external clock input).
TPS54426RSAR 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)
TPS54426RSAR FAQ
1.How can I place an order for TPS54426RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54426RSAR 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 TPS54426RSAR reliable?
The price and inventory of TPS54426RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54426RSAR is usually 5 days.
3.What payment methods are accepted for TPS54426RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54426RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54426RSAR?
TPS54426RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54426RSAR 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 TPS54426RSAR?
For technical support, including TPS54426RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54426RSAR requirements.
6.How does Aetrix verify that TPS54426RSAR is sourced from the original manufacturer or authorized distributors?
All TPS54426RSAR 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 TPS54426RSAR meets industry standards.
7.What is the process for return or replacement of TPS54426RSAR?
All TPS54426RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54426RSAR, 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 TPS54426RSAR part is unused and in its original packaging.
Return procedure for TPS54426RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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