My Inquiry
My Account
Texas Instruments TPS542951PWPR
- Part No.:
- TPS542951PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS542951PWPR.pdf
- Description:
- IC REG BCK ADJ 2A/3A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 digital TV and STB power supplies.
For engineers reviewing the TPS542951 datasheet, TPS542951 pinout, TPS542951 application, or TPS542951 equivalent, key selection criteria include its dual-channel current capability (2 A/3 A), 700 kHz pseudo-fixed switching frequency, non-sinking pre-biased soft start, Eco-mode™ light-load efficiency, and HTSSOP-16 PowerPAD™ thermal package compatibility with ceramic output capacitors.
Technical Context
The TPS542951 implements D-CAP2™ control - an adaptive on-time PWM architecture that eliminates external compensation while maintaining stability with ultra-low-ESR ceramic capacitors. Its internal ramp-based reference emulation enables fast load-step response without output ripple dependency.
Each channel features independent enable (EN1/EN2), soft-start (SS1/SS2), feedback (VFB1/VFB2), and power-good (PG1/PG2) signals. Current sensing is lossless via low-side rDS(on) with thermal compensation, and over-current protection uses cycle-by-cycle valley detection with hiccup-mode recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer DC bus inputs including 5 V, 12 V, and 15 V rails. |
| Output Current Capability | CH1: 2 A continuous; CH2: 3 A continuous - enables independent regulation of core and I/O rails in compact systems. |
| Switching Frequency | ~700 kHz (adaptive on-time) - balances efficiency, size, and EMI; no external clock required. |
| Feedback Reference Voltage | 0.765 V ±7 mV - sets precise output voltage via resistor divider; enables 1.5 V and 3.3 V generation with <1% error. |
| Thermal Shutdown Threshold | 155 °C with 25 °C hysteresis - protects against sustained overload; junction temperature monitoring ensures safe operation up to 150 °C. |
| Efficiency at Light Load | Eco-mode™ auto-skip - maintains >80% efficiency at 10 mA output, critical for always-on standby circuits. |
| Soft-Start Control | Adjustable via SSx-to-GND capacitor - prevents inrush current; supports non-sinking startup into pre-biased outputs. |
Pinout & Package
TPS542951 is housed in a 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad (pin 16). The package measures 4.4 mm × 5.0 mm and requires soldering the thermal pad to PCB ground for optimal thermal performance (θJA = 47.5 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Power input supply pins | Independent 4.5–18 V inputs for each channel; must be decoupled with ≥10 µF ceramic + 0.1 µF local caps. |
| VBST1 / VBST2 | Bootstrap supply for high-side gate drivers | Requires 0.1 µF X5R ceramic capacitor between VBSTx and SWx; enables efficient 100% duty-cycle capable drive. |
| SW1 / SW2 | Switch node outputs | Connects to external inductors; carries high di/dt; layout critical for EMI and efficiency. |
| PGND1 / PGND2 | Power ground returns | Low-side MOSFET source returns; separate paths minimize noise coupling between channels. |
| EN1 / EN2 | Enable inputs | Active-high logic (2.0 V threshold); allows independent sequencing and power-down of each regulator. |
| VFB1 / VFB2 | Feedback inputs | High-impedance (±0.4 µA) 0.765 V reference nodes; connect to resistor dividers for output voltage setting. |
| SS1 / SS2 | Soft-start programming | Sink current (~8 µA) charges external capacitor; determines ramp time and prevents overshoot during startup. |
| GND | Signal ground reference | Return for VFBx, VREG5, and SSx; must be star-connected near IC to avoid noise injection. |
| VREG5 | Integrated 5.5 V LDO output | Powers internal circuitry and can supply auxiliary 5 V loads up to 75 mA; bypass with ≥1 µF ceramic cap. |
| PG1 / PG2 | Open-drain power-good flags | Assert low when respective output falls >32% below target; used for system sequencing and fault indication. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control mode | Zero external compensation required; stable with ceramic, POSCAP, and SP-CAP output capacitors. |
| Lossless low-side current sensing | rDS(on)-based sensing with 4000 ppm/°C thermal compensation - enables accurate OCP across temperature. |
| Non-sinking pre-biased soft start | Prevents reverse current flow into powered outputs during startup - essential for hot-plug and multi-rail sequencing. |
| Auto-Skip Eco-mode™ | Discontinuous conduction at light load - extends battery life and reduces no-load power to <150 µA. |
| Integrated 5.5 V LDO (VREG5) | Self-powered bias rail - eliminates need for external bias supply; supports up to 75 mA auxiliary load. |
Applications
| Digital Television Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Dual-rail power for SoC core (1.2 V/1.5 V) and DDR memory interface (1.8 V/3.3 V) in 4K UHD TV platforms. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise DC rails with fast transient response to handle video processing bursts. Use Value: D-CAP2™ control achieves <50 mV undershoot during 2 A load steps, reducing need for bulk capacitance and board area. | Use Scenario: Compact dual-output supply for cable modem/router SoCs requiring isolated 1.2 V CPU and 3.3 V PHY rails. IC Role / Device Role / Timing Role: Synchronous buck controller managing independent enable sequencing and power-good signaling for system-level reset coordination. Use Value: Independent EN1/EN2 and PG1/PG2 pins enable precise power-up order and fault isolation without external logic. |
| Digital Set-Top Box (STB) | Gaming Console Auxiliary Rail |
Use Scenario: Powering ARM-based media processor and HDMI transmitter in low-cost STB designs with strict cost and thermal constraints. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter replacing discrete solutions to reduce BOM count and improve thermal performance in sealed enclosures. Use Value: HTSSOP-16 PowerPAD™ package achieves 47.5 °C/W θJA, enabling full 2 A/3 A load without heatsink in 70 °C ambient. | Use Scenario: Generating 1.8 V GPU core and 5 V USB peripheral rails in portable gaming handhelds with battery input (7–12 V). IC Role / Device Role / Timing Role: Adaptive on-time buck regulator supporting variable input and dynamic load profiles typical of interactive graphics workloads. Use Value: Eco-mode™ maintains >85% efficiency at 50 mA, extending runtime during menu navigation and low-intensity 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 |
|---|---|---|---|
| TPS542950PWPR | Same pinout and D-CAP2™ control, but rated for 2 A/2 A (not 2 A/3 A); lower CH2 current limit (3.5 A vs 4.7 A typ). | Not suitable for 3 A CH2 loads; acceptable only if second channel demand ≤2 A. | Select TPS542950PWPR only when both channels require ≤2 A and cost optimization is prioritized over headroom. |
| MP2451DT-LF-Z | Single-channel 2 A converter in 8-pin SOIC; no dual output, no VREG5 LDO, no Eco-mode; fixed 500 kHz frequency. | Requires two separate ICs to match dual-rail functionality; increases board area and component count. | Use MP2451DT-LF-Z only in space-tolerant, single-rail designs where simplicity outweighs integration benefits. |
Compared with TPS542950PWPR and MP2451DT-LF-Z, the TPS542951PWPR uniquely delivers asymmetric 2 A/3 A dual-channel regulation with integrated bias LDO and adaptive Eco-mode - making it optimal for compact, thermally constrained, multi-rail consumer electronics where channel loading is unbalanced.
Availability
TPS542951PWPR 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, consistent parametric performance, and long-term production continuity.
Supply support for TPS542951PWPR 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 technologies with decades of DC/DC converter innovation.
The TPS542951 belongs to TI's D-CAP2™ synchronous buck converter family, engineered for high-efficiency, low-component-count point-of-load regulation in space-constrained consumer and computing applications.
FAQ
What is the maximum output current supported by each channel of the TPS542951PWPR?
The TPS542951PWPR supports up to 2 A continuously on Channel 1 and 3 A continuously on Channel 2 under recommended operating conditions (TA ≤ 85 °C, proper PCB thermal design). Peak current limits are 3.9 A (CH1) and 4.7 A (CH2) per electrical characteristics table. Derating is required above 85 °C ambient or with inadequate thermal vias under the PowerPAD™.
Does the TPS542951PWPR require external compensation components?
No, the TPS542951PWPR uses D-CAP2™ adaptive on-time control, which eliminates the need for external compensation networks. Stability is maintained inherently with ceramic, POSCAP, or SP-CAP output capacitors - no type-II or type-III compensation required. This reduces BOM count and simplifies layout.
Can the TPS542951PWPR safely start up into a pre-biased output voltage?
Yes, the TPS542951PWPR features non-sinking pre-biased soft start. When the output is already biased above the target voltage at startup, the controller gradually enables synchronous rectification using narrow low-side gate pulses, preventing reverse current flow and ensuring monotonic ramp-up without output collapse.
What is the purpose of the VREG5 pin on the TPS542951PWPR?
The VREG5 pin on the TPS542951PWPR is an integrated 5.5 V linear regulator output capable of supplying up to 75 mA. It powers internal circuitry and can also serve auxiliary 5 V loads. It must be bypassed with ≥1 µF high-quality ceramic capacitor to GND and becomes active when VIN1 exceeds UVLO threshold (~3.83 V).
How does the TPS542951PWPR protect against over-temperature conditions?
The TPS542951PWPR monitors die temperature and initiates thermal shutdown at ~155 °C (with 25 °C hysteresis). Upon shutdown, all switching ceases until junction temperature falls below ~130 °C, then automatic restart occurs. During VIN1 startup, thermal threshold is temporarily reduced to ~110 °C until VREG5 stabilizes - a safety feature documented in the datasheet.
TPS542951PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- 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-HTSSOP
TPS542951PWPR FAQ
1.How can I place an order for TPS542951PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS542951PWPR 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 TPS542951PWPR reliable?
The price and inventory of TPS542951PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS542951PWPR is usually 5 days.
3.What payment methods are accepted for TPS542951PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS542951PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS542951PWPR?
TPS542951PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS542951PWPR 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 TPS542951PWPR?
For technical support, including TPS542951PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS542951PWPR requirements.
6.How does Aetrix verify that TPS542951PWPR is sourced from the original manufacturer or authorized distributors?
All TPS542951PWPR 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 TPS542951PWPR meets industry standards.
7.What is the process for return or replacement of TPS542951PWPR?
All TPS542951PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS542951PWPR, 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 TPS542951PWPR part is unused and in its original packaging.
Return procedure for TPS542951PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS542951PWPR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
