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Texas Instruments TPS542941RSAR
- Part No.:
- TPS542941RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS542941RSAR.pdf
- Description:
- IC REG BUCK ADJ 2A/3A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,316
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Product details
Overview
TPS542941 from Texas Instruments is a dual-channel synchronous step-down DC/DC converter with integrated 150 mΩ high-side and 100 mΩ low-side N-channel MOSFETs per channel, delivering 2 A on Channel 1 and 3 A on Channel 2. It operates across 4.5 V–18 V input, supports 0.76 V–7 V output voltages, and uses D-CAP2™ adaptive on-time control for fast transient response in point-of-load digital TV and STB power supplies.
For engineers reviewing the TPS542941 datasheet, TPS542941 pinout, TPS542941 application, or TPS542941 equivalent, key selection criteria include dual-channel current capability (2A/3A), 700 kHz pseudo-fixed switching frequency, non-sinking pre-biased soft start, loss-less low-side current sensing, and thermal shutdown at 155°C - all validated for HTSSOP-16 (RSA) packaging with PowerPAD™ thermal pad.
Technical Context
The TPS542941 implements D-CAP2™ control combining adaptive on-time PWM with internal compensation, enabling stable operation with ceramic or ultra-low-ESR capacitors without external loop components. Its valley-current sensing uses thermally compensated rDS(on) of the low-side FET for accurate cycle-by-cycle over-current protection.
Each channel features independent enable (EN1/EN2), feedback (VFB1/VFB2), power-good (PG1/PG2), and bootstrap (VBST1/VBST2) inputs, with shared GND and dedicated PGND1/PGND2 returns. The device transitions seamlessly between PWM and Auto-Skip Eco-mode™ to maintain >90% efficiency at light loads while supporting pre-biased startup.
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 systems. |
| Output Current | 2 A (CH1) / 3 A (CH2) continuous - enables independent regulation of core and I/O rails in compact designs. |
| Switching Frequency | 700 kHz (pseudo-fixed) - balances EMI performance and inductor size; adapts via VIN/VO ratio to maintain stability. |
| Feedback Accuracy | ±1.5 mV (765 mV nominal) - ensures tight output regulation critical for low-voltage microprocessor cores. |
| Thermal Shutdown | 155°C threshold with 25°C hysteresis - protects against sustained overload without latch-up. |
| Soft Start Time | 1.0 ms fixed - prevents inrush current and ensures controlled ramp-up of both outputs simultaneously. |
| Current Limit | 3.9 A (CH1), 4.7 A (CH2) typical - provides headroom above rated load for transient surges in digital loads. |
Pinout & Package
TPS542941 is packaged in a 4 mm × 4 mm, 16-pin HTSSOP (RSA) with exposed PowerPAD™ thermal pad soldered to PCB ground for enhanced thermal dissipation (θJB = 11.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Power Input | Independent 4.5–18 V inputs for each channel; decoupled with ≥10 µF ceramic + 0.1 µF local caps. |
| SW1 / SW2 | Switch Node | Drain connections of high-side and source of low-side FETs; requires low-inductance layout to minimize ringing. |
| VBST1 / VBST2 | Bootstrap Supply | Supplies gate drive for high-side FETs; must be connected to SWx via 0.1 µF X5R/X7R ceramic capacitor. |
| VFB1 / VFB2 | Feedback Input | Resistor-divider input referenced to 0.765 V; supports 0.76–7 V output with ±115 ppm/°C tempco. |
| EN1 / EN2 | Enable Control | Logic-level inputs (2.0 V H-threshold, 0.4 V L-threshold); support sequencing and standby mode control. |
| PG1 / PG2 | Power-Good Output | Open-drain signals asserting after 1.5 ms when VOx is within ±16% of target; pull-up required externally. |
| VREG5 | Internal LDO Output | 5.5 V regulated supply for internal circuitry; bypassed with ≥1 µF ceramic cap to GND. |
| GND / PGND1 / PGND2 | Ground Returns | Signal GND (pin 10) and separate power-ground returns for each channel minimize noise coupling. |
| PowerPAD™ | Thermal Pad | Exposed copper pad (backside) - must be soldered to large PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Enables zero-external-compensation design with fast transient response (<10 µs) and compatibility with ceramic output caps. |
| Loss-Less Current Sensing | Uses thermally compensated low-side rDS(on) - eliminates sense resistor, reduces BOM count and power loss. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into powered rails - essential for hot-swap and multi-rail sequencing. |
| Auto-Skip Eco-mode™ | Maintains >85% efficiency at 10 mA load - extends battery life and reduces no-load power in always-on systems. |
| Hiccup-Mode Overload Protection | Shuts down for 7×UVP delay (10.5 ms) then retries - limits junction temperature rise during sustained short-circuit faults. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2 V core, 3.3 V I/O) and audio codec in 4K UHD television platforms. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise DC rails with fast load-step response to handle video processing bursts. Use Value: D-CAP2™ control achieves <50 mV undershoot on 2 A load step without external compensation, reducing output capacitance by 40% vs traditional controllers. | Use Scenario: Compact power solution for DSL/cable modems with Ethernet PHY, Wi-Fi SoC, and USB peripherals. IC Role / Device Role / Timing Role: Dual-channel point-of-load converter supplying 1.5 V (PHY) and 3.3 V (USB interface) from single 12 V input. Use Value: Independent EN1/EN2 pins enable precise power sequencing; PG1/PG2 signals coordinate system reset and firmware initialization. |
| Digital Set Top Box (STB) | Gaming Console Subsystem |
Use Scenario: Power management for ARM-based STB with HDMI controller, tuner, and memory subsystem. IC Role / Device Role / Timing Role: Core voltage regulator (1.1 V) and memory I/O rail (1.8 V) with hiccup-mode protection against HDMI hot-plug transients. Use Value: Thermal shutdown at 155°C and 11.8°C/W θJB ensure reliable operation in sealed enclosures without forced airflow. | Use Scenario: Secondary power stage for GPU voltage tracking or peripheral rail (e.g., 1.5 V DDR termination, 3.3 V audio DAC). IC Role / Device Role / Timing Role: High-efficiency auxiliary buck converter operating in Eco-mode during idle states to reduce system standby power. Use Value: Auto-Skip Eco-mode™ delivers 92% efficiency at 50 mA load - cuts quiescent power by 3× versus fixed-frequency alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS542951RSAR | Same pinout and package; higher CH1 current rating (3 A), identical CH2 (3 A); shares D-CAP2™, Eco-mode, and thermal specs. | Preferred where both channels require ≥3 A continuous load - e.g., dual-core SoC with symmetric rail requirements. | Select TPS542951RSAR if symmetrical 3 A/3 A output capability is needed; otherwise TPS542941RSAR offers optimal cost/performance for 2 A/3 A asymmetry. |
| MP8845GQ-Z | Monolithic dual buck (2 A/2 A); 2.5–18 V input; 300 kHz–2.2 MHz adjustable frequency; no integrated VREG5 LDO or PG outputs. | Lacks power-good signaling and internal 5.5 V LDO - requires external bias and monitoring circuitry for safety-critical systems. | Choose MP8845GQ-Z only for space-constrained designs needing programmable frequency and lower BOM count; avoid where PG sequencing or VREG5 dependency exists. |
Compared with TPS542951RSAR and MP8845GQ-Z, the TPS542941RSAR uniquely balances asymmetric current delivery (2 A/3 A), integrated VREG5 LDO, dual PG outputs, and D-CAP2™ simplicity - making it optimal for cost-sensitive, thermally constrained digital consumer applications requiring proven reliability and minimal external components.
Availability
TPS542941 is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top box (STB) designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS542941 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 TPS542941 belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for low-component-count, high-transient-response point-of-load regulation in space- and cost-constrained digital consumer electronics.
FAQ
What is the maximum input voltage rating for the TPS542941?
The TPS542941 has an absolute maximum input voltage rating of 20 V on VIN1 and VIN2 pins. However, the recommended operating range is 4.5 V to 18 V. Exceeding 18 V may trigger UVLO or cause reliability degradation over time. The TPS542941 datasheet specifies 20 V as the stress limit, not functional operating condition - sustained use above 18 V is not advised.
Does the TPS542941 support pre-biased output startup?
Yes, the TPS542941 implements non-sinking pre-biased soft start. When enabled, it avoids pulling current from an already-powered output rail by gradually enabling synchronous rectification using narrow low-side gate pulses that increment cycle-by-cycle. This behavior is intrinsic to the TPS542941 control architecture and requires no external components.
What thermal performance can be expected from the TPS542941 in HTSSOP-16 (RSA) package?
In the RSA package, the TPS542941 achieves θJB = 11.8°C/W and θJA = 34.9°C/W with standard 2-layer JEDEC test board. With proper PowerPAD™ soldering to a 4 cm² internal ground plane, junction-to-board thermal resistance drops further - enabling full 3 A CH2 load at 85°C ambient without derating when airflow is limited.
How does the TPS542941 implement over-current protection?
The TPS542941 uses cycle-by-cycle valley-current detection on the low-side FET's rDS(on), with thermal compensation (4000 ppm/°C) to maintain accuracy across temperature. When sensed current exceeds the threshold (3.9 A CH1 / 4.7 A CH2 typ), the low-side FET remains on until current falls below threshold - a non-latching, self-resetting mechanism confirmed in the TPS542941 electrical characteristics table.
Can the TPS542941 operate with ceramic output capacitors?
Yes, the TPS542941 is explicitly optimized for ceramic output capacitors due to its D-CAP2™ control architecture. The datasheet confirms stability with zero-ESR ceramics and recommends 20 µF–68 µF total capacitance per channel. No external compensation network is required - a key differentiator validated across all TPS542941 characterization curves.
TPS542941RSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 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:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 2A, 3A
- 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)
TPS542941RSAR FAQ
1.How can I place an order for TPS542941RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS542941RSAR 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 TPS542941RSAR reliable?
The price and inventory of TPS542941RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS542941RSAR is usually 5 days.
3.What payment methods are accepted for TPS542941RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS542941RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS542941RSAR?
TPS542941RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS542941RSAR 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 TPS542941RSAR?
For technical support, including TPS542941RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS542941RSAR requirements.
6.How does Aetrix verify that TPS542941RSAR is sourced from the original manufacturer or authorized distributors?
All TPS542941RSAR 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 TPS542941RSAR meets industry standards.
7.What is the process for return or replacement of TPS542941RSAR?
All TPS542941RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS542941RSAR, 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 TPS542941RSAR part is unused and in its original packaging.
Return procedure for TPS542941RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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