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Texas Instruments TPS54394RSAT
- Part No.:
- TPS54394RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54394RSAT.pdf
- Description:
- IC REG BUCK ADJ 3A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,652
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Product details
Overview
TPS54394RSAT 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, supporting 3 A continuous output current per channel across 4.5 V–18 V input and 0.76 V–7 V output ranges. It employs D-CAP2™ adaptive on-time control for fast transient response without external compensation, enabling point-of-load regulation in digital TV, STB, and gaming console power supplies.
For engineers reviewing the TPS54394RSAT datasheet, TPS54394RSAT pinout, TPS54394RSAT application, or TPS54394RSAT equivalent, key selection considerations include its HTSSOP-16 PowerPAD™ package, dual independent soft-start (1 ms), non-sinking pre-biased startup, and thermally compensated cycle-by-cycle over-current protection with hiccup-mode overload recovery.
Technical Context
The TPS54394RSAT implements dual independent D-CAP2™ control loops-each combining adaptive on-time PWM with internal pseudo-fixed-frequency operation (~700 kHz) set by VINx and VOx-enabling stable regulation with ceramic or low-ESR polymer output capacitors. Its valley-current sensing uses temperature-compensated rDS(on) loss-less detection across both channels.
Each channel features dedicated ENx, VFBx, PGx, and PGNDx terminals, with shared GND and VREG5 (5.5 V LDO) for biasing. The device supports Auto-Skip Eco-mode™ for light-load efficiency and includes independent undervoltage lockout (UVLO), thermal shutdown (155°C), and output UVP (68% trip) with 1.5 ms delay.
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 V - programmable via resistor divider; enables core voltage (1.5 V), I/O (3.3 V), and auxiliary rail generation. |
| Max Output Current | 3 A per channel - sustained at both outputs simultaneously under thermal limits (θJA = 41.4°C/W in HTSSOP). |
| Switching Frequency | ~700 kHz - pseudo-fixed frequency set by adaptive on-time; reduces EMI filter size while maintaining transient performance. |
| Feedback Accuracy | ±0.9% (758–773 mV at 25°C) - ensures tight output regulation critical for low-voltage logic and memory supplies. |
| Soft-Start Time | 1 ms fixed - prevents inrush current; supports non-sinking pre-biased startup to avoid output discharge during hot-plug. |
| Thermal Shutdown | 155°C threshold with 25°C hysteresis - protects against sustained overload; junction resumes operation after cooldown. |
Pinout & Package
TPS54394RSAT is housed in a 4.4 mm × 5 mm 16-pin HTSSOP package with exposed PowerPAD™ thermal pad (soldered to PCB ground for optimal thermal dissipation). Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Power Input | Dual independent input pins for each buck channel; connect to respective DC input rails (4.5–18 V). |
| SW1 / SW2 | Switch Node | Drain connections of high-side FETs and source of low-side FETs; route with short, low-inductance traces to minimize ringing. |
| VBST1 / VBST2 | Bootstrap Supply | Supply for high-side gate drivers; requires 0.1 µF ceramic capacitor to corresponding SWx pin. |
| EN1 / EN2 | Enable Control | Independent TTL-compatible enable inputs (VENH = 2.0 V, VENL = 0.4 V); pull high to activate channel. |
| VFB1 / VFB2 | Feedback Input | Resistor-divider sense nodes for output voltage regulation; input bias current ±0.4 µA enables high-impedance dividers. |
| PG1 / PG2 | Power-Good Output | Open-drain status signals indicating ±16% output regulation; 1.5 ms delay after soft-start completion. |
| PGND1 / PGND2 | Power Ground | Separate return paths for low-side FETs and current sensing; must be tied to PowerPAD™ and kept isolated from SGND. |
| GND | Signal Ground | Reference for VFBx, SSx, and sensitive analog circuitry; connect at single-point star ground near IC. |
| VREG5 | Bias Regulator Output | 5.5 V LDO output (75 mA max); powers internal logic and VBSTx circuits; bypass with ≥1 µF ceramic to GND. |
| Exposed Pad | Thermal & Electrical Ground | Must be soldered to large PCB copper area connected to GND; primary path for heat removal and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Eliminates need for external compensation components while delivering <10 µs load-step response with ceramic output caps. |
| Integrated FETs | 90 mΩ high-side + 60 mΩ low-side MOSFETs per channel - enables >90% peak efficiency at 12 V→3.3 V/3 A without discrete power stages. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow into pre-charged outputs - essential for hot-swap and multi-rail sequencing applications. |
| Loss-Less Current Sensing | rDS(on)-based valley-current detection with thermal compensation - maintains accurate OCP across –40°C to 85°C ambient. |
| Hiccup-Mode Overload Protection | Shuts down for 7×UVP delay time (10.5 ms) then auto-retries - limits average power dissipation during sustained short-circuit faults. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers SoC core (1.2 V), DDR interface (1.5 V), and HDMI PHY (3.3 V) from a single 12 V input rail in compact TV chassis. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing independent, sequenced, and regulated DC outputs with fast transient immunity to video frame bursts. Use Value: Reduces BOM count by eliminating two discrete converters; D-CAP2™ control maintains <±1% output deviation during 0→3 A load steps. | Use Scenario: Supplies FPGA I/O banks (3.3 V), transceiver cores (1.8 V), and USB PHY (5 V via VREG5) in DSL/cable modem hardware. IC Role / Device Role / Timing Role: Primary point-of-load regulator managing dynamic current demands of packet-processing engines and serial interfaces. Use Value: Eco-mode™ extends standby efficiency to >85% at 10 mA load; PGx signals synchronize firmware boot sequence with rail readiness. |
| Digital Set Top Box (STB) | Gaming Console Power Management |
Use Scenario: Generates 1.1 V CPU core, 1.5 V memory, and 3.3 V peripherals from 12 V adapter in space-constrained STB enclosures. IC Role / Device Role / Timing Role: Dual synchronous buck controller delivering tightly regulated, low-noise rails with independent enable and power-good signaling. Use Value: 1 ms soft-start and pre-biased startup prevent brownout during cold boot; thermal shutdown protects against enclosure overheating. | Use Scenario: Delivers GPU core (0.95 V), memory (1.35 V), and I/O (3.3 V) in handheld or portable gaming devices with aggressive thermal budgets. IC Role / Device Role / Timing Role: High-efficiency dual buck converter operating from battery-derived 8–16 V input with adaptive frequency scaling. Use Value: HTSSOP PowerPAD™ enables 2.7 W dissipation at 85°C ambient; hiccup-mode prevents thermal runaway during gameplay spikes. |
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 |
|---|---|---|---|
| TPS54395RSAR | Same pinout and electrical specs, but VQFN-16 (4 mm × 4 mm) package with lower θJA (32.8°C/W) and no PowerPAD™ thermal pad requirement. | Better thermal performance in dense layouts; requires different PCB footprint and reflow profile. | Select when board space is constrained and thermal margin is critical; verify layout compatibility with RSA footprint. |
| MP8865GQ-Z | Monolithic dual 3 A buck with 2.5–18 V input, but uses voltage-mode control (requires external compensation) and lacks D-CAP2™ transient response. | Higher external component count; less suitable for ceramic-capacitor-only designs or ultra-fast load-step requirements. | Consider for cost-sensitive designs where transient speed is secondary and design flexibility for loop tuning is preferred. |
Compared with TPS54394RSAT, the TPS54395RSAR offers superior thermal resistance in a smaller footprint but requires VQFN assembly, while the MP8865GQ-Z trades off transient performance and simplicity for broader input range and vendor diversification-neither is pin-compatible, but both serve overlapping dual-rail PoL use cases.
Availability
TPS54394RSAT is available at Aetrix Electronics and suitable for digital TV, STB, and networking terminal designs requiring stable component supply, long-term production continuity, and automotive-grade reliability validation.
Supply support for TPS54394RSAT 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.
The TPS54394RSAT belongs to TI's D-CAP2™ synchronous buck converter family, engineered for low-component-count, high-transient-performance point-of-load regulation in consumer and industrial systems with strict size and efficiency constraints.
FAQ
What is the recommended input capacitor configuration for TPS54394RSAT?
TPS54394RSAT requires a minimum 10 µF ceramic input capacitor (X5R/X7R dielectric) placed close to VIN1/VIN2 pins, plus 0.1 µF ceramic capacitors from each VIN pin to PGND. For high-current or noisy environments, add bulk electrolytic capacitance (e.g., 100 µF) upstream. All capacitors must withstand ≥20 V rating per absolute maximum ratings.
Does TPS54394RSAT support independent enable and power-good signaling per channel?
Yes, TPS54394RSAT provides fully independent EN1/EN2 enable inputs and PG1/PG2 open-drain power-good outputs. Each PGx asserts high after 1.5 ms once its corresponding VFBx reaches ±16% of target voltage, allowing precise rail sequencing and fault isolation in multi-output systems.
Can TPS54394RSAT operate with ceramic output capacitors only?
Yes, TPS54394RSAT is explicitly designed for ceramic and ultra-low-ESR polymer capacitors. Its D-CAP2™ control architecture eliminates reliance on ESR-induced ripple for stability, enabling use of 20–68 µF X5R/X7R ceramics without phase compensation networks.
What is the thermal performance difference between TPS54394RSAT and the VQFN variant?
TPS54394RSAT in HTSSOP-16 has θJA = 41.4°C/W, while the VQFN-16 (TPS54395RSAR) achieves θJA = 32.8°C/W due to superior thermal pad coupling. Both share identical silicon; the RSAT variant relies on PowerPAD™ soldering to PCB ground plane for effective heat transfer.
How does the non-sinking pre-biased soft start function in TPS54394RSAT?
When an output is pre-biased, TPS54394RSAT delays full synchronous rectification until VFBx exceeds the soft-start DAC voltage. It initiates low-side FET gating with narrow pulses, incrementally increasing on-time cycle-by-cycle to match (1−D) duty ratio-preventing reverse current and ensuring monotonic ramp-up from any pre-charge level.
TPS54394RSAT 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:
- 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)
TPS54394RSAT FAQ
1.How can I place an order for TPS54394RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54394RSAT 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 TPS54394RSAT reliable?
The price and inventory of TPS54394RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54394RSAT is usually 5 days.
3.What payment methods are accepted for TPS54394RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54394RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54394RSAT?
TPS54394RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54394RSAT 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 TPS54394RSAT?
For technical support, including TPS54394RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54394RSAT requirements.
6.How does Aetrix verify that TPS54394RSAT is sourced from the original manufacturer or authorized distributors?
All TPS54394RSAT 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 TPS54394RSAT meets industry standards.
7.What is the process for return or replacement of TPS54394RSAT?
All TPS54394RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54394RSAT, 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 TPS54394RSAT part is unused and in its original packaging.
Return procedure for TPS54394RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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