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Texas Instruments TPS542951RSAT
- Part No.:
- TPS542951RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS542951RSAT.pdf
- Description:
- IC REG BUCK ADJ 2A/3A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
TPS542951 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 CH1 and 3 A on CH2. It operates from 4.5 V to 18 V input, supports output voltages from 0.76 V to 7.0 V, and uses D-CAP2™ adaptive on-time control for fast transient response in point-of-load applications such as digital TV power supplies and networking terminals.
For engineers reviewing the TPS542951 datasheet, TPS542951 pinout, TPS542951 application, or TPS542951 equivalent, key selection considerations include its dual-channel current capability (2 A/3 A), 700 kHz pseudo-fixed switching frequency, non-sinking pre-biased soft start, cycle-by-cycle over-current protection, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The TPS542951 implements D-CAP2™ control - an adaptive on-time PWM architecture that eliminates need for external loop compensation while maintaining stability with ultra-low-ESR ceramic capacitors. Its internal timer sets on-time inversely proportional to VIN and proportional to VO, yielding ~700 kHz pseudo-fixed frequency across input and load conditions.
Each channel features loss-less low-side rDS(on) current sensing with thermal compensation, auto-skip Eco-mode™ for light-load efficiency, and independent enable (EN1/EN2), soft-start (SS1/SS2), and feedback (VFB1/VFB2) pins. Protection includes UVLO (on VREG5), hiccup-mode OCP, UVP/OVP, and thermal shutdown at 155°C with 25°C hysteresis.
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 Capability | CH1: 2 A continuous; CH2: 3 A continuous - enables independent regulation of core and I/O rails in compact designs. |
| Switching Frequency | ~700 kHz (adaptive on-time) - balances size (small inductors/caps) and efficiency across load range. |
| Feedback Reference Voltage | 0.765 V ±7 mV - enables precise output setting down to 0.76 V using standard resistor dividers. |
| Current Limit Threshold | CH1: 2.7–4.5 A; CH2: 3.5–5.4 A - thermally compensated cycle-by-cycle OCP prevents FET overstress under overload. |
| Soft-Start Charge Current | –8.0 µA (typ) on SSx - allows adjustable startup time via external capacitor; supports non-sinking pre-biased startup. |
| Thermal Shutdown | 155°C threshold with 25°C hysteresis - protects IC during sustained overload or poor PCB thermal design. |
Pinout & Package
TPS542951 is housed in a 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad requiring solder connection to PCB ground plane for thermal performance. Package dimensions: 4.4 mm × 5.0 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Power Inputs | Independent input supplies for CH1 and CH2; each connects to respective high-side FET drain and powers internal LDO (VREG5). |
| VBST1 / VBST2 | Bootstrap Supplies | Drive high-side gate via external 0.1 µF ceramic cap between VBSTx and SWx; internal diode charges from VREG5. |
| SW1 / SW2 | Switch Nodes | Drain-source connections of both FETs per channel; used for current sensing and bootstrap capacitor coupling. |
| PGND1 / PGND2 | Power Ground Returns | Low-side FET source returns and current sense reference points; must be routed separately from SGND for noise immunity. |
| EN1 / EN2 | Enable Inputs | Active-high logic enables; 2.0 V H-threshold, 0.4 V L-threshold; internal 225–900 kΩ pull-down ensures default disable. |
| VFB1 / VFB2 | Feedback Inputs | High-impedance (±0.4 µA) inputs monitoring output voltage via resistor divider; reference = 0.765 V. |
| SS1 / SS2 | Soft-Start Control | Sink current (–8 µA typ) to GND; capacitor value sets ramp time; enables controlled, non-sinking startup into pre-biased rails. |
| VREG5 | Integrated 5.5 V LDO Output | Supplies internal circuitry and bootstraps VBSTx; requires ≥1.0 µF ceramic bypass to GND; UVLO triggers at 3.83 V. |
| GND | Signal Ground | Reference for VFBx, SSx, ENx; must connect to single-point star ground near VFB dividers to minimize noise coupling. |
| PowerPAD™ | Thermal & Electrical Ground | Exposed copper pad on bottom; must be soldered to large PCB copper area tied to PGND for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Enables stable operation with zero-ESR ceramic capacitors and eliminates external compensation components - reduces BOM count and layout sensitivity. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into powered rails by gradually enabling low-side FET conduction - critical for hot-swap and multi-rail sequencing. |
| Loss-Less Low-Side Current Sensing | Uses rDS(on) of low-side FET for OCP without sense resistor - preserves efficiency and avoids power loss and board space. |
| Auto-Skip Eco-mode™ | Transitions to discontinuous conduction mode below ~200 mA load - maintains >85% efficiency at light loads without audible switching noise. |
| Hiccup-Mode Overload Protection | Shuts down for 7× soft-start time upon UVP detection, then retries - limits junction temperature rise during sustained short-circuit faults. |
| Thermally Compensated OCP | Adjusts current limit threshold using 4000 ppm/°C rDS(on) tracking - ensures consistent trip point across –40°C to 85°C ambient. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers SoC core (1.2 V/2 A), memory interface (1.5 V/3 A), and USB PHY (3.3 V/1 A) from 12 V input in compact set-top box PCB. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing isolated, sequenced, and ripple-controlled DC rails with fast load-step response. Use Value: Eliminates need for two discrete converters; D-CAP2™ achieves <100 mV undershoot on 2 A step with 22 µF ceramic output caps. |
Use Scenario: Supplies FPGA I/O bank (3.3 V/2 A) and processor core (1.5 V/3 A) in residential gateway with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary point-of-load regulator managing dynamic current demands of packet processing and RF subsystems. Use Value: Eco-mode™ sustains >90% efficiency at 50 mA idle load; PowerPAD™ enables 34.9°C/W θJA in 2-layer PCB layout. |
| Digital Set Top Box (STB) | Gaming Console Core Rail |
Use Scenario: Generates 1.2 V CPU core and 3.3 V peripheral rails from 12 V adapter in space-constrained STB enclosure with passive cooling. IC Role / Device Role / Timing Role: Dual-output synchronous buck delivering tightly regulated, low-noise power with independent enable control. Use Value: Pre-biased soft start prevents brownout during warm reboot; hiccup-mode OCP avoids thermal runaway during firmware update failures. |
Use Scenario: Regulates GPU core voltage (1.1 V/2.5 A) and memory controller rail (1.35 V/2.8 A) in handheld gaming device with battery + adapter input. IC Role / Device Role / Timing Role: High-efficiency dual buck managing burst-mode GPU loads and dynamic voltage scaling (DVS). Use Value: Adaptive on-time control delivers <50 ns response to 1.5 A load transients; thermal shutdown protects silicon during sustained gameplay. |
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 |
|---|---|---|---|
| TPS542950RSAT | Same pinout and D-CAP2™ architecture, but rated for 2 A/2 A (not 2 A/3 A); identical thermal and electrical specs otherwise. | Limited to symmetric dual-rail designs; cannot support 3 A on CH2 without derating or parallel configuration. | Select when both channels require ≤2 A and cost optimization is prioritized over CH2 headroom. |
| LM27402SQ/NOPB | Uses voltage-mode PWM with external compensation; requires 2x op-amp + RC network; no Eco-mode; 2.5 A/2.5 A rating. | Higher component count and layout sensitivity; less efficient at light loads; lacks pre-biased soft start. | Choose only if legacy voltage-mode control or specific EMI profile requirements override integration benefits. |
Compared with TPS542951, TPS542950RSAT offers identical integration and footprint but reduced CH2 current capacity, while LM27402SQ/NOPB trades simplicity and light-load efficiency for design flexibility and external loop tuning - making TPS542951 optimal for space- and efficiency-constrained dual-rail systems.
Availability
TPS542951 is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and gaming console core rail designs requiring stable component supply, long-term lifecycle support, and production-ready qualification.
Supply support for TPS542951 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 system-level power architecture.
The TPS542951 belongs to TI's D-CAP2™ synchronous buck converter family, designed specifically for compact, high-transient-response point-of-load regulation in consumer, computing, and communications equipment where minimal external components and robust thermal behavior are essential.
FAQ
What is the recommended input capacitor configuration for TPS542951?
TPS542951 requires a minimum 10 µF ceramic input capacitor (X5R/X7R, ≥25 V rating) placed close to VIN1/VIN2 pins, plus 0.1 µF ceramic capacitors directly from VIN1-to-PGND1 and VIN2-to-PGND2 to suppress high-frequency switching noise. Bulk capacitance beyond 10 µF may be added based on input source impedance and hold-up requirements. The TPS542951 datasheet specifies these values to ensure stable operation and minimize input voltage ripple under peak load conditions.
Does TPS542951 support independent voltage sequencing between CH1 and CH2?
Yes, TPS542951 supports full independent sequencing via separate EN1/EN2 and SS1/SS2 pins. Each channel can be enabled/disabled asynchronously, and soft-start timing is programmable per channel using individual SSx-to-GND capacitors. This enables precise power-up order (e.g., CH2 before CH1) and staggered ramp rates - critical for FPGA or multi-core SoC applications where rail dependencies exist. The TPS542951 internal logic ensures no cross-talk between channels during sequencing.
Can TPS542951 operate with ceramic output capacitors only, without electrolytics or POSCAPs?
Yes, TPS542951 is explicitly designed for ceramic-only output filtering. Its D-CAP2™ control loop remains stable with zero-ESR ceramic capacitors (20–68 µF typical), eliminating need for bulk electrolytic or polymer capacitors. The internal high-frequency zero compensates for ceramic's lack of ESR-induced phase boost. Designers must follow TI's recommended Cff/R1/R2 values from the datasheet Table 1 to ensure adequate phase margin - the TPS542951 has been validated with X5R/X7R ceramics across –40°C to 85°C.
What is the maximum achievable output voltage accuracy for TPS542951 under full temperature range?
The TPS542951 guarantees a feedback reference voltage of 0.765 V ±7 mV (±0.9%) at TA = 25°C, with temperature coefficient of ±115 ppm/°C. Over –40°C to 85°C, total error remains within ±1.8% (±13.8 mV) assuming ideal resistor divider. Real-world accuracy depends on resistor tolerance (1% recommended), layout parasitics, and thermal gradients - the TPS542951's tight VREF spec and low VFBx input current (±0.4 µA) enable <±2% total output error in production designs.
How does the hiccup-mode overload protection behave during sustained short-circuit on CH2?
When CH2 experiences sustained overload causing output voltage to drop below 68% of nominal (UVP trip), the TPS542951 initiates hiccup mode: it shuts down both channels for 7× the programmed soft-start time (e.g., ~14 ms for 2 nF SS2 cap), then attempts restart. If fault persists, cycle repeats indefinitely - limiting average power dissipation and junction temperature rise. This behavior is documented in the TPS542951 datasheet Section 7.3.8 and prevents thermal damage during field-level fault conditions.
TPS542951RSAT 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)
TPS542951RSAT FAQ
1.How can I place an order for TPS542951RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS542951RSAT 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 TPS542951RSAT reliable?
The price and inventory of TPS542951RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS542951RSAT is usually 5 days.
3.What payment methods are accepted for TPS542951RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS542951RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS542951RSAT?
TPS542951RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS542951RSAT 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 TPS542951RSAT?
For technical support, including TPS542951RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS542951RSAT requirements.
6.How does Aetrix verify that TPS542951RSAT is sourced from the original manufacturer or authorized distributors?
All TPS542951RSAT 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 TPS542951RSAT meets industry standards.
7.What is the process for return or replacement of TPS542951RSAT?
All TPS542951RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS542951RSAT, 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 TPS542951RSAT part is unused and in its original packaging.
Return procedure for TPS542951RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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