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Texas Instruments TPS542951PWP
- Part No.:
- TPS542951PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS542951PWP.pdf
- Description:
- IC REG BCK ADJ 2A/3A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:580
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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, supporting 2 A on CH1 and 3 A on CH2. It operates from 4.5 V to 18 V input, delivers adjustable 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 enabling stable operation with ultra-low-ESR ceramic capacitors. Its internal ramp injection simulates ripple, allowing regulation even under near-zero-output-ripple conditions.
Each channel features independent enable (EN1/EN2), feedback (VFB1/VFB2), soft-start (SS1/SS2), and power-good (PG1/PG2) signals, with dedicated VIN1/VIN2, VBST1/VBST2, SW1/SW2, and PGND1/PGND2 paths. Thermal shutdown (155°C) and hiccup-mode overload protection ensure robust system-level reliability.
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 power rail generation for SoC cores and I/O domains. |
| Switching Frequency | ~700 kHz (adaptive on-time) - balances efficiency, size, and EMI; no external clock required. |
| Feedback Reference Voltage | 0.765 V ±115 ppm/°C - precise setpoint enables accurate output regulation across temperature. |
| High-Side rDS(on) | 150 mΩ (CH1 & CH2) - reduces conduction loss at high duty cycles; optimized for low-VOUT applications. |
| Low-Side rDS(on) | 100 mΩ (CH1 & CH2) - enables lossless current sensing via RDS(on) voltage drop across PGND-SW path. |
| Soft-Start Charge Current | –8.0 µA (typ.) - sets programmable startup time via external SSx-to-GND capacitor; prevents inrush. |
Pinout & Package
TPS542951 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad requiring PCB solder connection for junction-to-board thermal resistance of 20.8°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Power Input | Dedicated inputs for each channel; connect to respective input rails (4.5–18 V); decoupling required. |
| VBST1 / VBST2 | Bootstrap Supply | Drives high-side gate; requires 0.1 µF ceramic capacitor between VBSTx and SWx for charge pump operation. |
| SW1 / SW2 | Switch Node | Drain-source connection point for internal FETs; connects to external inductor; high dv/dt node. |
| PGND1 / PGND2 | Power Ground | Low-side FET return path; must be routed separately from SGND to minimize noise coupling into feedback. |
| VFB1 / VFB2 | Feedback Input | Resistor-divider tap point; senses output voltage; high-impedance input (±0.4 µA bias current). |
| EN1 / EN2 | Enable Control | Active-high logic inputs (2.0 V H-threshold, 0.4 V L-threshold); support independent channel sequencing. |
| SS1 / SS2 | Soft-Start | Sink current (–8 µA) to GND; sets ramp time for output voltage; supports pre-biased startup. |
| GND | Signal Ground | Analog reference for VFBx and internal circuits; tie to single-point ground near VFB dividers. |
| VREG5 | Internal LDO Output | 5.5 V regulated supply for internal circuitry; bypass with ≥1 µF ceramic capacitor to GND. |
| PowerPAD™ | Thermal Pad | Exposed copper pad on bottom; must be soldered to PCB thermal plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Enables zero-external-compensation design with ceramic capacitors; achieves <1 µs load transient response. |
| Auto-Skip Eco-mode™ | Improves light-load efficiency by entering discontinuous conduction mode below ~200 mA per channel. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup when output is pre-charged; avoids system brownout. |
| Thermally Compensated OCP | Current limit remains stable across temperature (4000 ppm/°C rDS(on) compensation) - ensures consistent fault threshold. |
| Hiccup-Mode Overload Protection | Shuts down for 7×UVP-enable-delay upon sustained overcurrent; limits junction temperature rise during faults. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
|
Use Scenario: Powers SoC core (1.2 V/2 A) and memory I/O (1.8 V/3 A) in smart TV mainboard. IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering tightly regulated, low-noise rails with independent enable sequencing. Use Value: Eliminates need for two discrete converters; D-CAP2™ maintains stability with 22 µF ceramic caps per rail. |
Use Scenario: Supplies 3.3 V (2 A) and 1.5 V (3 A) to Ethernet PHY and ARM-based gateway processor. IC Role / Device Role / Timing Role: Primary POL regulator with independent EN control for staggered power-up of subsystems. Use Value: Pre-biased soft start prevents bus collapse when hot-plugging PoE-powered modules. |
| Digital Set Top Box (STB) | Gaming Console Core Supply |
|
Use Scenario: Generates 1.1 V CPU core and 1.8 V DDR interface rails from 12 V input in STB main board. IC Role / Device Role / Timing Role: Dual synchronous buck controller with integrated FETs and thermal monitoring. Use Value: 700 kHz switching allows compact 2.2 µH/1.5 µH inductors; hiccup mode protects against short-circuit faults. |
Use Scenario: Delivers 1.2 V/2 A and 1.0 V/3 A to GPU and CPU cores in portable gaming device. IC Role / Device Role / Timing Role: High-efficiency dual buck converter with Eco-mode™ for battery runtime extension. Use Value: Adaptive on-time control sustains >85% efficiency at 50 mA load - critical for standby modes. |
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 |
|---|---|---|---|
| TPS542950PWP | Same pinout and D-CAP2™ architecture but rated for 2 A/2 A (not 2 A/3 A); lower CH2 current limit. | Not suitable where CH2 requires >2 A continuous; acceptable for symmetric 2 A/2 A loads. | Select TPS542950PWP only if both channels demand ≤2 A and cost optimization is prioritized. |
| LM27402SQ/NOPB | Uses voltage-mode control with external compensation; requires more external components; no Eco-mode™. | Better suited for designs needing fixed-frequency synchronization or tighter EMI control via external clock. | Choose LM27402SQ/NOPB when deterministic 700 kHz operation (not adaptive) and external sync capability are required. |
Compared with TPS542951, TPS542950PWP offers identical layout compatibility but reduced CH2 capacity, while LM27402SQ/NOPB trades integration for greater control flexibility - making TPS542951 optimal for space-constrained, high-transient-response dual-rail systems.
Availability
TPS542951 is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top box applications requiring stable component supply, long-term production continuity, and automotive-grade thermal reliability.
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 and embedded processing technologies, with decades of expertise in power management ICs.
The TPS542951 belongs to TI's D-CAP2™ synchronous buck converter family, designed specifically for high-efficiency, low-component-count point-of-load regulation in consumer and industrial electronics.
FAQ
What is the maximum recommended input voltage for the TPS542951?
The absolute maximum input voltage rating for VIN1 and VIN2 pins of the TPS542951 is 20 V, but the recommended operating range is 4.5 V to 18 V. Operation above 18 V risks exceeding safe operating area limits and may trigger UVLO or damage internal circuitry. Always maintain input transients within –0.3 V to 20 V per datasheet Absolute Maximum Ratings.
Does the TPS542951 support independent enable control for each channel?
Yes, the TPS542951 provides fully independent enable inputs: EN1 controls CH1 and EN2 controls CH2. Each has a 2.0 V typical high-threshold and 0.4 V low-threshold, allowing flexible power sequencing - for example, enabling CH1 before CH2 to meet processor boot requirements. Both pins tolerate up to 18 V and draw <1 µA in disabled state.
How does the TPS542951 achieve stable regulation with ceramic output capacitors?
The TPS542951 uses D-CAP2™ control, which injects an internal ramp signal into the feedback comparator to emulate ripple voltage. This eliminates dependence on ESR-induced ripple for loop stability, enabling use of ultra-low-ESR ceramic capacitors (e.g., 22 µF X5R) without external compensation components - reducing BOM count and improving transient response.
What thermal management is required for the TPS542951 in HTSSOP (PWP) package?
The TPS542951 PWP package requires soldering of the exposed PowerPAD™ to a PCB copper thermal plane with ≥4 thermal vias (0.3 mm diameter) connecting to inner or bottom-layer ground planes. Without proper thermal pad connection, junction temperature can exceed 150°C under full load - triggering thermal shutdown. Measured θJB is 20.8°C/W with adequate PCB layout.
Can the TPS542951 safely start up into a pre-biased output voltage?
Yes, the TPS542951 implements non-sinking pre-biased soft start. When the output voltage exceeds the soft-start command level, it gradually increases low-side FET on-time cycle-by-cycle instead of forcing immediate conduction - preventing reverse current flow and avoiding system brownout. This feature is enabled by default and requires no external configuration.
TPS542951PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-HTSSOP
TPS542951PWP FAQ
1.How can I place an order for TPS542951PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS542951PWP 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 TPS542951PWP reliable?
The price and inventory of TPS542951PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS542951PWP is usually 5 days.
3.What payment methods are accepted for TPS542951PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS542951PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS542951PWP?
TPS542951PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS542951PWP 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 TPS542951PWP?
For technical support, including TPS542951PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS542951PWP requirements.
6.How does Aetrix verify that TPS542951PWP is sourced from the original manufacturer or authorized distributors?
All TPS542951PWP 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 TPS542951PWP meets industry standards.
7.What is the process for return or replacement of TPS542951PWP?
All TPS542951PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS542951PWP, 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 TPS542951PWP part is unused and in its original packaging.
Return procedure for TPS542951PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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