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Texas Instruments TPS54294RSAT
- Part No.:
- TPS54294RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54294RSAT.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:429
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Product details
Overview
TPS54294RSAT 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 output current per rail, 4.5–18 V input, and 0.76–7.0 V adjustable output voltage. It employs D-CAP2™ adaptive on-time control for fast transient response in point-of-load digital TV and STB power supplies.
For engineers reviewing the TPS54294RSAT datasheet, TPS54294RSAT pinout, TPS54294RSAT application, or TPS54294RSAT equivalent, this device delivers fixed 700 kHz pseudo-switching frequency, non-sinking pre-biased soft start, lossless low-side current sensing, and comprehensive protection including OCP, OVP/UVP, UVLO, and thermal shutdown - all in a thermally enhanced HTSSOP-16 PowerPAD package.
Technical Context
The TPS54294RSAT implements dual independent D-CAP2™ control loops, each combining adaptive on-time PWM with internal compensation to eliminate external loop components while maintaining stability with ceramic or ultra-low-ESR output capacitors. Its valley-current-based cycle-by-cycle over-current protection uses thermally compensated rDS(on) sensing on the low-side FET.
Each channel operates autonomously with dedicated EN, PG, VFB, VBST, and SW pins; the VREG5 linear regulator (5.5 V, 75 mA) powers internal circuitry and supplies bootstrap bias via internal diodes. The device transitions seamlessly between PWM mode at heavy loads and Auto-Skip Eco-mode™ at light loads to sustain high efficiency across 0.001–2 A output range.
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 Voltage Range | 0.76 V to 7.0 V - programmable via resistor divider on VFB1/VFB2, enabling core logic, memory, and I/O rail generation. |
| Max Output Current | 2 A per channel - sufficient for powering SoCs, FPGAs, and ASICs in digital set-top boxes and gaming consoles. |
| Switching Frequency | ~700 kHz - pseudo-fixed frequency set by VIN/VO ratio; enables compact magnetics and predictable EMI filtering. |
| Feedback Accuracy | ±1.5% over temperature - 765 mV nominal reference with ±115 ppm/°C TC ensures tight regulation under thermal stress. |
| Thermal Protection | 155 °C shutdown with 25 °C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Soft Start Time | 1.0 ms - internal ramp prevents inrush current and ensures monotonic startup without output droop or overshoot. |
Pinout & Package
TPS54294RSAT is housed in a 4.4 mm × 5.0 mm 16-pin HTSSOP package with exposed PowerPAD thermal pad (pin 16), requiring soldering to PCB ground plane for optimal thermal performance (θJA = 47.5 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 (Pins 1, 16) | Power Input | Supply inputs for Channel 1 and Channel 2; connect to bulk input capacitors and must withstand up to 20 V absolute max. |
| VBST1, VBST2 (Pins 2, 15) | Bootstrap Supply | Gate drive boost supply for high-side FETs; requires 0.1 µF ceramic capacitor to respective SWx pin. |
| SW1, SW2 (Pins 3, 14) | Switch Node | Drain-source connection point of both high- and low-side FETs; carries high dv/dt switching waveforms and requires tight layout. |
| PGND1, PGND2 (Pins 4, 13) | Power Ground | Low-side FET source return path; must be routed separately from signal ground and tied to PowerPAD. |
| EN1, EN2 (Pins 5, 12) | Enable Input | CMOS-compatible enable with 2.0 V H-threshold and 0.4 V L-threshold; controls individual channel startup sequencing. |
| PG1, PG2 (Pins 6, 11) | Power Good Output | Open-drain status flag asserting high after 1.5 ms when VOx is within ±16% of target; requires external pull-up. |
| VFB1, VFB2 (Pins 7, 10) | Feedback Input | High-impedance (±0.35 µA) input for resistor divider; sets output voltage via VREF × (1 + R1/R2) = VOx. |
| GND (Pin 8) | Signal Ground | Analog reference for VFB, SS, and internal comparators; must be star-connected near VFB pins to minimize noise coupling. |
| VREG5 (Pin 9) | Linear Regulator Output | 5.5 V, 75 mA regulated supply for internal logic and bootstrap diode anode; bypassed with ≥1 µF ceramic to GND. |
| PowerPAD (Bottom) | Thermal & Electrical Ground | Exposed copper pad; must be soldered to large PCB ground plane with ≥6 thermal vias for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Eliminates external compensation components and enables stable operation with ceramic output capacitors as low as 22 µF. |
| Auto-Skip Eco-mode™ | Reduces light-load quiescent current to 80–200 µA and maintains >85% efficiency down to 1 mA output current. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow into pre-charged outputs by gradually enabling synchronous rectification during startup. |
| Loss-Less Low-Side Current Sensing | Uses thermally compensated rDS(on) of low-side FET (100 mΩ) for accurate OCP without sense resistor power loss. |
| Integrated 5.5 V Linear Regulator | Supplies internal circuitry and bootstraps high-side drivers; eliminates need for external bias supply in most applications. |
| Comprehensive Protection Suite | Includes cycle-by-cycle OCP, ±16% PG window, 120%/68% OVP/UVP thresholds, UVLO on VREG5, and 155 °C thermal shutdown. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers main SoC, DDR memory, and HDMI interface in 4K UHD television platforms with dynamic load steps up to 2 A. IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering 1.2 V @ 2 A (core) and 3.3 V @ 2 A (I/O) from 12 V input bus. Use Value: D-CAP2™'s sub-10 µs transient response holds output voltage within ±30 mV during 0–2 A load steps, eliminating need for oversized bulk capacitance. | Use Scenario: Supplies FPGA, PHY, and USB controller in residential gateway devices with strict standby power requirements. IC Role / Device Role / Timing Role: Independent channel control enables staggered startup and deep-sleep mode where one rail remains active while the other shuts down. Use Value: Auto-Skip Eco-mode™ achieves 92% efficiency at 10 mA load, reducing no-load power consumption to <250 µA per channel. |
| Digital Set Top Box (STB) | Gaming Console Subsystem |
Use Scenario: Generates 1.1 V CPU core and 1.8 V GPU rails in cable/satellite STBs operating in thermally constrained plastic enclosures. IC Role / Device Role / Timing Role: Dual synchronous buck with shared thermal pad manages heat from two 2 A switching stages in minimal board area. Use Value: PowerPAD-enhanced HTSSOP package achieves 47.5 °C/W θJA, allowing full 2 A/channel operation at 85 °C ambient without forced air. | Use Scenario: Powers audio codec, Wi-Fi module, and sensor hub in handheld gaming devices requiring low-noise, low-EMI power delivery. IC Role / Device Role / Timing Role: Fixed 700 kHz switching frequency enables deterministic EMI filtering; VREG5 supplies clean 5.5 V bias to analog subsystems. Use Value: Integrated 5.5 V LDO and loss-less current sensing reduce BOM count by 4 components versus discrete solutions. |
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 |
|---|---|---|---|
| TPS54295RSAT | Same pinout and package; supports 3 A per channel with higher rDS(on) (120 mΩ HS / 70 mΩ LS) and 1.2 MHz switching. | Better suited for higher-current applications but increases conduction loss at 2 A and requires re-optimization of LC filter. | Select TPS54295RSAT only if >2.2 A peak load per rail is required and thermal margin permits higher losses. |
| MP2494DS-LF-Z | Monolithic dual 2 A buck in QFN-20; uses current-mode control, 500 kHz fixed frequency, and lacks VREG5 or pre-biased soft start. | Requires external bias supply and external compensation; less suitable for ceramic-capacitor-only designs or pre-biased systems. | Choose MP2494DS-LF-Z for cost-sensitive, non-pre-biased applications where external compensation is acceptable. |
Compared with TPS54294RSAT, TPS54295RSAT offers higher current capability at the expense of thermal performance and efficiency at 2 A, while MP2494DS-LF-Z trades integration and feature set for lower unit cost and simpler control loop tuning - making TPS54294RSAT optimal for balanced performance, thermal, and feature requirements in mid-power consumer electronics.
Availability
TPS54294RSAT is available at Aetrix Electronics and suitable for digital TV power supply, networking home terminal, and digital set-top box applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54294RSAT 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 automotive-grade reliability.
The TPS54294 product line delivers dual-channel, adaptive on-time synchronous buck converters optimized for space-constrained consumer electronics requiring fast transient response, low quiescent current, and seamless light-load efficiency - particularly in digital video and broadband infrastructure.
FAQ
What is the recommended input capacitor configuration for TPS54294RSAT?
TPS54294RSAT requires a minimum 10 µF ceramic input capacitor placed near VIN1/VIN2 pins, plus 0.1 µF ceramic capacitors directly from each VIN pin to PGND to suppress high-frequency switching noise. Bulk capacitance (e.g., 47–100 µF tantalum or aluminum polymer) should be added based on input ripple current rating and hold-up time requirements. All capacitors must have voltage ratings exceeding the maximum input voltage (20 V absolute max).
Does TPS54294RSAT support pre-biased output startup?
Yes, TPS54294RSAT implements non-sinking pre-biased soft start. When the output is pre-charged, the controller delays activation of the low-side FET until the internal soft-start reference exceeds the feedback voltage, then incrementally increases gate drive duty to avoid sinking current from the output. This ensures monotonic startup without voltage droop or reverse current, critical for systems with multiple power domains.
What is the function of the VREG5 pin on TPS54294RSAT?
VREG5 on TPS54294RSAT is a 5.5 V, 75 mA linear regulator output that powers internal control circuitry and provides bias for the high-side gate drivers via internal bootstrap diodes. It activates when VIN1 rises above UVLO threshold and must be bypassed with ≥1 µF ceramic capacitor to GND. VREG5 cannot be loaded externally beyond its rated current without degrading regulation or causing thermal issues.
How does the D-CAP2™ control mode improve transient response in TPS54294RSAT?
D-CAP2™ control in TPS54294RSAT eliminates external compensation components by embedding adaptive on-time logic that responds directly to output voltage deviation. It injects an internal ramp to simulate ripple, enabling immediate on-time adjustment during load transients - achieving typical 5–8 µs recovery time for 0–2 A steps while maintaining stability with ceramic output capacitors as low as 22 µF.
Can TPS54294RSAT operate with only one channel enabled?
Yes, TPS54294RSAT supports independent channel operation: EN1 and EN2 are separate logic inputs, allowing Channel 1 to be active while Channel 2 remains disabled (or vice versa). When one channel is disabled, its associated MOSFETs are fully off, quiescent current drops to ~200 µA total, and VREG5 remains active if VIN1 is present - enabling flexible power sequencing and partial-system sleep modes.
TPS54294RSAT 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
- 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)
TPS54294RSAT FAQ
1.How can I place an order for TPS54294RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54294RSAT 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 TPS54294RSAT reliable?
The price and inventory of TPS54294RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54294RSAT is usually 5 days.
3.What payment methods are accepted for TPS54294RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54294RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54294RSAT?
TPS54294RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54294RSAT 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 TPS54294RSAT?
For technical support, including TPS54294RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54294RSAT requirements.
6.How does Aetrix verify that TPS54294RSAT is sourced from the original manufacturer or authorized distributors?
All TPS54294RSAT 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 TPS54294RSAT meets industry standards.
7.What is the process for return or replacement of TPS54294RSAT?
All TPS54294RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54294RSAT, 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 TPS54294RSAT part is unused and in its original packaging.
Return procedure for TPS54294RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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