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Texas Instruments TPS54494RSAT
- Part No.:
- TPS54494RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54494RSAT.pdf
- Description:
- IC REG BUCK ADJ 4A/2A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:530
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Product details
Overview
TPS54494RSAT from Texas Instruments is a dual-channel synchronous step-down DC/DC converter with integrated 90 mΩ high-side and 60 mΩ low-side N-channel MOSFETs per channel, delivering 4 A on Channel 1 and 2 A on Channel 2. It operates across 4.5 V–18 V input, supports output voltages from 0.76 V to 7 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 TPS54494RSAT datasheet, TPS54494RSAT pinout, TPS54494RSAT application, or TPS54494RSAT equivalent, key selection criteria include its HTSSOP-16 PowerPAD™ package, dual independent soft-start (1 ms), non-sinking pre-biased startup, cycle-by-cycle over-current protection, and Eco-mode™ operation enabling >90% efficiency at light loads.
Technical Context
The TPS54494RSAT implements D-CAP2™ control - combining adaptive on-time PWM with internal ripple injection - eliminating external compensation while supporting ceramic and low-ESR polymer capacitors. Its two independent control loops feature fixed 700 kHz pseudo-switching frequency, thermally compensated rDS(on)-based current sensing, and seamless transition between PWM and Eco-mode™ based on load.
Each channel integrates dedicated EN, PG, VFB, VBST, and SW pins with separate PGND returns; VREG5 provides an internally regulated 5.5 V supply for gate drive and logic. Protection includes UVLO (3.83 V on VREG5), thermal shutdown (155 °C), hiccup-mode overload recovery, and ±16% power-good monitoring referenced to VFBx.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-input industrial and consumer power rails without external regulators. |
| Output Voltage Range | 0.76 V to 7 V - programmable via resistor divider on VFB1/VFB2 for core, I/O, and auxiliary rail generation. |
| Channel 1 Output Current | 4 A continuous - enables single-chip regulation for 3.3 V/4 A or 1.2 V/4 A CPU/memory rails. |
| Channel 2 Output Current | 2 A continuous - suitable for secondary rails like DDR termination, USB PHY, or audio codec supplies. |
| Switching Frequency | ~700 kHz - fixed-frequency operation enables predictable EMI filtering and compact magnetics design. |
| Feedback Reference Accuracy | ±0.9% (758–773 mV at 25 °C) - ensures tight output voltage regulation under varying load and temperature. |
| Thermal Shutdown Threshold | 155 °C with 25 °C hysteresis - protects against sustained overload while allowing brief peak-power operation. |
| Soft-Start Time | 1.0 ms - prevents inrush current and ensures controlled ramp-up of both outputs during power-on. |
Pinout & Package
TPS54494RSAT is housed in a 4 mm × 4 mm, 16-pin VQFN package (RSA) with exposed thermal pad (PowerPAD™) soldered to PCB ground for optimal thermal performance (θJCbot = 1.6 °C/W). Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 3) | Primary input supply | Connects to high-side FET drain and powers internal 5.5 V LDO (VREG5); requires local 10 µF + 0.1 µF decoupling. |
| VIN2 (Pin 2) | Secondary input supply | Independent input for Channel 2; may be tied to VIN1 or isolated for dual-rail systems. |
| SW1 (Pin 5) | Channel 1 switch node | Drain connection of CH1 high-side/low-side FETs; connects to output inductor and bootstrap capacitor (VBST1–SW1). |
| SW2 (Pin 16) | Channel 2 switch node | Drain connection of CH2 high-side/low-side FETs; requires dedicated 0.1 µF ceramic bootstrap cap to VBST2. |
| VBST1 (Pin 4), VBST2 (Pin 1) | Bootstrap supply inputs | Supply gate drive for respective high-side FETs; internally diode-fed from VREG5; must be bypassed to SWx. |
| EN1 (Pin 7), EN2 (Pin 14) | Enable inputs | Active-high logic inputs (2.0 V threshold); support independent sequencing and power-down of each channel. |
| VFB1 (Pin 9), VFB2 (Pin 12) | Feedback inputs | High-impedance (±0.4 µA) inputs for resistor-divider networks setting VO1/VO2; reference = 765 mV nominal. |
| PG1 (Pin 8), PG2 (Pin 13) | Power-good outputs | Open-drain signals asserting high after 1.5 ms when VOx is within ±16% of target; require external pull-up. |
| VREG5 (Pin 11) | Internal LDO output | 5.5 V regulated supply powering internal logic and gate drivers; bypass with ≥1 µF ceramic to GND. |
| GND (Pin 10) | Signal ground | Reference for VFBx, SSx, and analog circuitry; must be star-connected to PGND1/PGND2 near IC. |
| PGND1 (Pin 6), PGND2 (Pin 15) | Power ground returns | Low-side FET source connections and current-sense return paths; separate routing minimizes noise coupling. |
| Exposed Pad | Thermal & electrical ground | Must be soldered to solid GND plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Zero external compensation required; supports ceramic, POSCAP, and SP-CAP output capacitors with stable loop response. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into pre-biased outputs by gradually enabling synchronous rectification. |
| Loss-Less Low-Side Current Sensing | rDS(on)-based sensing eliminates sense resistor losses and improves efficiency, especially at light loads. |
| Auto-Skip Eco-mode™ | Discontinuous conduction mode activation below ~200 mA per channel maintains >85% efficiency at ultra-light loads. |
| Thermally Compensated OCP | Current limit threshold drift <4000 ppm/°C ensures consistent over-current protection across –40°C to 85°C ambient. |
| Integrated Adaptive Gate Drivers | Optimized drive strength and timing reduce switching losses and enable reliable operation with 0.1 µF bootstrap caps. |
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 HDMI PHY (1.8 V, 5 V) in compact set-top boxes. IC Role / Device Role / Timing Role: Primary buck controller providing tightly regulated, sequenced, and monitored DC rails. Use Value: Eliminates need for discrete gate drivers and compensation networks, reducing BOM count by ≥6 components per rail. |
Use Scenario: Power management for DSL/Cable modem with ARM processor, Ethernet PHY, and memory interface. IC Role / Device Role / Timing Role: Dual-output regulator delivering 1.1 V CPU core and 1.5 V DDR3 termination simultaneously. Use Value: Independent EN/PG pins enable precise power sequencing and fault isolation between subsystems. |
| Digital Set-Top Box (STB) | Gaming Console Auxiliary Rail |
Use Scenario: Compact power solution for hybrid broadcast receivers integrating tuner, demodulator, and video decoder. IC Role / Device Role / Timing Role: Dual-channel converter generating 1.0 V logic and 3.3 V interface rails from 12 V input. Use Value: D-CAP2™ fast transient response (<10 µs) maintains regulation during bursty video decode workloads. |
Use Scenario: Secondary power stage for GPU voltage tracking, audio codec, or USB controller in game consoles. IC Role / Device Role / Timing Role: Standby-capable auxiliary regulator with independent enable and power-good signaling. Use Value: Eco-mode™ extends system standby time by reducing quiescent current to 20 µA per channel in shutdown. |
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 |
|---|---|---|---|
| TPS544B20RJER | Higher current (15 A/channel), 3.3 V–20 V input, PMBus interface, 4 mm × 5 mm QFN-32 | Targeted at server VRMs and high-performance computing; lacks pre-biased soft start and Eco-mode™ | Select when digital telemetry, higher current, or tighter output accuracy (±0.5%) is required. |
| MP8866DQKT-Z | 4 A/4 A dual output, 2.5 V–18 V input, 500 kHz fixed frequency, no VREG5 LDO, smaller 3 mm × 4 mm QFN-16 | Lower integration (no internal LDO or power-good), simpler control but requires external bias supply | Select when board space is critical and system already provides 5 V bias; not drop-in due to missing VREG5 and PG pins. |
Compared with TPS54494RSAT, the TPS544B20RJER offers greater current capacity and digital control at the cost of complexity and size, while the MP8866DQKT-Z reduces footprint and cost but sacrifices integrated bias and monitoring features essential for robust consumer electronics power sequencing.
Availability
TPS54494RSAT is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and gaming console auxiliary rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS54494RSAT 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 IC design and manufacturing.
The TPS54494 belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-component-count point-of-load regulation in space-constrained consumer and networking equipment.
FAQ
What is the package type and thermal pad requirement for TPS54494RSAT?
The TPS54494RSAT uses a 4 mm × 4 mm, 16-pin VQFN (RSA) package with an exposed thermal pad. This pad must be soldered to a PCB ground plane to achieve θJCbot = 1.6 °C/W and ensure safe operation at full load. Failure to connect the pad results in excessive junction temperature and potential thermal shutdown.
Does TPS54494RSAT support pre-biased output startup?
Yes, the TPS54494RSAT implements non-sinking pre-biased soft start. When enabled, it gradually activates the low-side FET with narrow pulses to avoid pulling current from a pre-charged output, ensuring smooth ramp-up without voltage droop or reverse current - a critical feature for hot-swap and multi-rail systems.
What protections are built into the TPS54494RSAT?
The TPS54494RSAT integrates cycle-by-cycle over-current protection (OCP), input UVLO (3.83 V on VREG5), thermal shutdown (155 °C), hiccup-mode overload recovery, and ±16% power-good monitoring. All protections are fully autonomous and require no external components to function.
Can TPS54494RSAT operate with ceramic output capacitors?
Yes - the D-CAP2™ control architecture is explicitly designed for ceramic and ultra-low-ESR capacitors. The internal ripple injection compensates for near-zero output ripple, enabling stable regulation without adding ESR or external compensation networks.
What is the difference between TPS54494RSAT and TPS54494PWPR?
The TPS54494RSAT uses a 4 mm × 4 mm VQFN (RSA) package with PowerPAD™, while the TPS54494PWPR uses a 4.4 mm × 5 mm HTSSOP (PWP) package. Both share identical electrical specs and pin functions, but the RSA variant offers lower thermal resistance (θJCbot = 1.6 °C/W vs. 3.5 °C/W) and better power density for compact designs.
TPS54494RSAT 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:
- 4A, 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)
TPS54494RSAT FAQ
1.How can I place an order for TPS54494RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54494RSAT 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 TPS54494RSAT reliable?
The price and inventory of TPS54494RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54494RSAT is usually 5 days.
3.What payment methods are accepted for TPS54494RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54494RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54494RSAT?
TPS54494RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54494RSAT 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 TPS54494RSAT?
For technical support, including TPS54494RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54494RSAT requirements.
6.How does Aetrix verify that TPS54494RSAT is sourced from the original manufacturer or authorized distributors?
All TPS54494RSAT 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 TPS54494RSAT meets industry standards.
7.What is the process for return or replacement of TPS54494RSAT?
All TPS54494RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54494RSAT, 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 TPS54494RSAT part is unused and in its original packaging.
Return procedure for TPS54494RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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