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Texas Instruments TPS54394RSAR
- Part No.:
- TPS54394RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54394RSAR.pdf
- Description:
- IC REG BUCK ADJ 3A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:828
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Product details
Overview
TPS54394RSAR 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 TPS54394RSAR datasheet, TPS54394RSAR pinout, TPS54394RSAR application, or TPS54394RSAR equivalent, key selection considerations include its HTSSOP-16 PowerPAD™ package, dual independent 700 kHz switching operation, non-sinking pre-biased soft start, and thermally compensated cycle-by-cycle over-current protection with hiccup-mode overload recovery.
Technical Context
The TPS54394RSAR implements two independent D-CAP2™ control loops-each combining adaptive on-time PWM with internal ramp-based ripple simulation to stabilize operation with ceramic or ultra-low-ESR output capacitors. Its control architecture eliminates need for external loop compensation while maintaining pseudo-fixed 700 kHz frequency via VIN/VO-dependent on-time calculation.
Each channel features lossless low-side rDS(on) current sensing with thermal compensation (4000 ppm/°C), fixed 1 ms soft-start, and independent power-good (PG1/PG2) monitoring referenced to ±16% VFB thresholds. Protection includes UVLO on VREG5, output undervoltage lockout at 68% VREF, thermal shutdown at 155°C, and auto-retry hiccup mode during sustained overloads.
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 logic (1.5 V), I/O (3.3 V), and analog (5 V) rails. |
| Max Output Current | 3 A per channel - sustained delivery with integrated FETs optimized for low-duty-cycle operation. |
| Switching Frequency | 700 kHz (pseudo-fixed) - balances efficiency, size, and EMI; determined by VIN/VO ratio, not oscillator. |
| FET rDS(on) | 90 mΩ HS / 60 mΩ LS - enables >90% peak efficiency at mid-load; thermally compensated for stable OCP. |
| Soft Start Time | 1 ms - internal ramp prevents inrush; non-sinking behavior avoids pulling current from pre-biased outputs. |
| Power Good Threshold | ±16% of VFB - PG1/PG2 assert after 1.5 ms delay when regulated; deassert within 2 µs on fault. |
Pinout & Package
TPS54394RSAR is housed in a 4 mm × 4 mm, 16-pin HTSSOP (RSA) package with exposed PowerPAD™ thermal pad soldered to PCB ground for enhanced thermal dissipation (θJCbot = 1.6 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 3) | Main input supply for Channel 1 | Connects to high-side FET drain and powers internal 5.5 V LDO (VREG5); requires local 10 µF ceramic decoupling. |
| VIN2 (Pin 2) | Main input supply for Channel 2 | Independent input rail; allows dual-input or split-rail configurations; same voltage range as VIN1. |
| VBST1 (Pin 4), VBST2 (Pin 1) | Bootstrap supply for high-side gate drivers | Each requires dedicated 0.1 µF X5R ceramic capacitor between VBSTx and SWx; enables NMOS high-side drive. |
| SW1 (Pin 5), SW2 (Pin 16) | Switch node outputs | Connect to external inductors; carry high di/dt; require tight layout and Kelvin grounding to PGNDx pins. |
| PGND1 (Pin 6), PGND2 (Pin 15) | Power ground returns for low-side FETs | Separate return paths minimize noise coupling between channels; must connect to local power plane under IC. |
| EN1 (Pin 7), EN2 (Pin 14) | Enable inputs for each channel | Active-high logic (VENH = 2.0 V min); internal 450 kΩ pull-down; supports independent sequencing or simultaneous startup. |
| VFB1 (Pin 9), VFB2 (Pin 12) | Feedback inputs | Resistor-divider nodes; reference voltage = 765 mV ±115 ppm/°C; input bias < ±0.4 µA enables high-impedance dividers. |
| PG1 (Pin 8), PG2 (Pin 13) | Open-drain power-good outputs | Assert high when VOx is within ±16% of target; require external pull-up; enable system power sequencing and fault detection. |
| VREG5 (Pin 11) | 5.5 V linear regulator output | Powers internal circuitry and VBSTx bootstrap circuits; bypass with ≥1 µF X5R ceramic to GND; UVLO threshold = 3.83 V. |
| GND (Pin 10) | Signal ground reference | Low-noise analog return for VFBx, SSx, and internal comparators; tie to PGND at single point near IC. |
| Exposed Pad | Thermal and electrical ground | Mandatory solder connection to PCB ground plane; provides primary thermal path (θJB = 9.9 °C/W) and reduces EMI. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Enables zero-external-compensation design with fast load-transient response (<10 µs) and stability across ceramic, POSCAP, and SP-CAP output capacitors. |
| Auto-Skip Eco-mode™ | Automatically transitions to discontinuous conduction at light loads (<300 mA), sustaining >85% efficiency down to 10 mA without audible noise or burst-mode artifacts. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into pre-charged outputs by ramping low-side gate drive duty cycle from zero, ensuring safe ramp-up from any initial VOx condition. |
| Thermally Compensated OCP | Uses rDS(on) temperature coefficient (4000 ppm/°C) to maintain constant 4.7 A typical current limit across –40°C to 125°C junction temperature range. |
| Integrated Dual 5.5 V LDO | VREG5 powers internal logic and both bootstrap circuits; eliminates need for external bias supply while supporting independent ENx control and sequencing. |
Applications
| Digital Television Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers SoC core (1.2 V), DDR memory interface (1.5 V), and HDMI PHY (3.3 V) from a 12 V DC input in compact set-top enclosures. IC Role / Device Role / Timing Role: Dual-channel buck controller delivering tightly regulated, sequenced, and monitored DC rails with minimal BOM count. Use Value: Eliminates discrete regulators and compensation networks; D-CAP2™ ensures sub-50 mV load-step deviation on 1.5 V rail at 3 A step change. | Use Scenario: Supplies FPGA I/O banks (3.3 V), transceiver cores (1.8 V), and management MCU (1.2 V) in DSL/cable modem designs with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Dual-output PMIC providing independent enable, soft-start, and power-good signaling for multi-rail system initialization. Use Value: Non-sinking soft start prevents brownout on pre-biased 3.3 V rail during cold boot; PG1/PG2 enable safe FPGA configuration sequence. |
| Digital Set Top Box (STB) | Gaming Console Mainboard |
Use Scenario: Generates 1.1 V CPU core, 1.5 V DDR3, and 3.3 V peripheral rails from 12 V adapter input in thermally constrained STB chassis. IC Role / Device Role / Timing Role: Dual synchronous buck converter with integrated FETs and thermal-aware OCP for reliable operation at 85°C ambient. Use Value: PowerPAD™ thermal pad and θJB = 9.9 °C/W enable full 3 A/channel output without heatsink; hiccup-mode protects against sustained short-circuit faults. | Use Scenario: Delivers GPU core (1.05 V), memory (1.35 V), and I/O (3.3 V) rails in high-performance gaming console mainboards with dynamic load profiles. IC Role / Device Role / Timing Role: Adaptive on-time D-CAP2™ controller supporting rapid load transients up to 3 A/µs without output droop or overshoot. Use Value: 700 kHz switching and ceramic-compatible design reduce output filter size by >40% vs traditional PWM solutions; Eco-mode™ extends battery life in portable variants. |
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 specs but supports adjustable soft-start (0.5–10 ms) and higher 4 A per channel rating; identical thermal performance and D-CAP2™ control. | Preferred where programmable soft-start timing or margin for future current scaling is required; otherwise functionally interchangeable. | Select TPS54395RSAR if design needs extended soft-start flexibility or headroom beyond 3 A sustained load. |
| MP8772GQ-Z | Monolithic dual 3 A buck with 2.5 V–18 V input, but uses current-mode control (not D-CAP2™); no integrated VREG5 LDO; requires external compensation. | Better suited for designs needing tighter current-limit accuracy or operating below 2.5 V input; lacks pre-biased soft start and PowerPAD™ thermal advantage. | Choose MP8772GQ-Z only if D-CAP2™-specific benefits (e.g., ceramic-cap stability, zero-compensation) are not required and layout space permits external compensation components. |
Compared with TPS54394RSAR, TPS54395RSAR offers direct upgrade path with identical footprint and enhanced current capability, while MP8772GQ-Z trades D-CAP2™ simplicity for current-mode flexibility and lower input voltage support-neither is pin-compatible nor drop-in, requiring layout and compensation review.
Availability
TPS54394RSAR is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and gaming console mainboards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54394RSAR 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 TPS54394RSAR belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for cost-sensitive, space-constrained consumer and industrial point-of-load applications demanding fast transient response and minimal external components.
FAQ
What is the recommended input capacitor configuration for TPS54394RSAR?
TI specifies a minimum 10 µF X5R/X7R ceramic capacitor placed close to VIN1 and VIN2 pins, plus 0.1 µF ceramic capacitors from each VIN pin to PGND. For robust EMI suppression and hold-up, add bulk electrolytic or polymer capacitors (e.g., 47–100 µF) upstream. The TPS54394RSAR datasheet Figure 24 shows validated layout with C4 (10 µF) and C11/C12 (10 µF each) as primary decoupling.
Does TPS54394RSAR support independent enable and power-good signaling per channel?
Yes, TPS54394RSAR provides fully independent EN1/EN2 inputs and PG1/PG2 open-drain outputs. Each EN pin has its own 450 kΩ internal pull-down and 2.0 V logic threshold, allowing staggered startup or fault-isolated shutdown. PG1 and PG2 each monitor their respective VFBx with ±16% window and 1.5 ms assertion delay, enabling precise multi-rail sequencing in systems like STBs and gaming consoles.
How does the D-CAP2™ control mode in TPS54394RSAR eliminate need for external compensation?
TPS54394RSAR's D-CAP2™ control embeds an internal ramp generator that simulates output ripple voltage, creating a built-in phase boost that compensates for LC filter double-pole instability. This allows stable operation with ceramic capacitors (ESR < 5 mΩ) without external RC networks-verified across 0.76 V–7 V outputs and 20–68 µF capacitor ranges per TI's Table 1 design guide.
What thermal derating guidance applies to TPS54394RSAR in its HTSSOP-16 RSA package?
With θJB = 9.9 °C/W and θJA = 32.8 °C/W, TPS54394RSAR delivers full 3 A/channel at 85°C ambient only with proper PowerPAD™ soldering to ≥4 cm² internal ground plane and ≥6 thermal vias. Derate linearly above 60°C ambient: at 70°C, max continuous current drops to ~2.7 A/channel; at 85°C, limit to 2.2 A/channel unless forced-air cooling is applied.
Can TPS54394RSAR safely start into a pre-biased output voltage?
Yes, TPS54394RSAR implements non-sinking pre-biased soft start: when enabled, it begins with zero low-side gate drive and incrementally increases duty cycle cycle-by-cycle until reaching normal CCM operation. This prevents reverse current flow into pre-charged outputs-critical for hot-swap or multi-rail systems where 3.3 V or 1.5 V rails may already be active before TPS54394RSAR startup.
TPS54394RSAR 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)
TPS54394RSAR FAQ
1.How can I place an order for TPS54394RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54394RSAR 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 TPS54394RSAR reliable?
The price and inventory of TPS54394RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54394RSAR is usually 5 days.
3.What payment methods are accepted for TPS54394RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54394RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54394RSAR?
TPS54394RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54394RSAR 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 TPS54394RSAR?
For technical support, including TPS54394RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54394RSAR requirements.
6.How does Aetrix verify that TPS54394RSAR is sourced from the original manufacturer or authorized distributors?
All TPS54394RSAR 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 TPS54394RSAR meets industry standards.
7.What is the process for return or replacement of TPS54394RSAR?
All TPS54394RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54394RSAR, 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 TPS54394RSAR part is unused and in its original packaging.
Return procedure for TPS54394RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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