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Texas Instruments TPS54394PWPR
- Part No.:
- TPS54394PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54394PWPR.pdf
- Description:
- IC REG BUCK ADJ 3A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,683
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Product details
Overview
TPS54394PWPR 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 independent 3 A output currents at 0.76 V–7 V output voltage range, 4.5 V–18 V input, and 700 kHz pseudo-fixed switching frequency using D-CAP2™ adaptive on-time control - deployed in digital TV power supplies, STB, and gaming console point-of-load regulation.
For engineers reviewing the TPS54394PWPR datasheet, TPS54394PWPR pinout, TPS54394PWPR application, or TPS54394PWPR equivalent, key selection considerations include dual-channel Eco-mode™ efficiency at light load, non-sinking pre-biased soft start, loss-less current sensing, and thermal shutdown with hiccup protection - all within the 4.4 mm × 5 mm HTSSOP-16 PowerPAD package.
Technical Context
The TPS54394PWPR implements D-CAP2™ control architecture combining adaptive on-time PWM with internal ramp compensation to enable stable operation with ceramic or ultra-low-ESR output capacitors without external loop compensation. Its dual independent channels share no feedback or timing coupling but use identical control logic and protection circuits.
Each channel features cycle-by-cycle over-current limiting via temperature-compensated rDS(on) sensing on the low-side FET, 1 ms fixed soft-start with pre-biased startup support, and separate open-drain PG1/PG2 outputs monitoring ±16% output regulation window with 1.5 ms high-to-low delay and 2 µs low-to-high delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-input industrial and consumer DC bus rails including 5 V, 12 V, and 15 V nominal supplies. |
| Output Voltage Range | 0.76 V to 7 V - programmable via resistor divider on VFB1/VFB2, enabling core voltage (1.5 V), I/O (3.3 V), and auxiliary rail generation. |
| Max Output Current | 3 A per channel - sustained continuous output with thermal derating; peak current limit 3.5–6.5 A (typ. 4.7 A). |
| Switching Frequency | 700 kHz (pseudo-fixed) - determined by VIN/VO ratio via adaptive on-time; enables compact magnetics and EMI filtering. |
| FET Rds(on) | 90 mΩ HS / 60 mΩ LS - optimized for low-duty-cycle operation; reduces conduction loss in high-VIN, low-VO applications. |
| Soft Start Time | 1 ms internal - prevents inrush current; supports non-sinking startup into pre-biased outputs. |
| Power Good Accuracy | ±16% VO window - PGx asserts after 1.5 ms once VFBx enters regulation; deasserts within 2 µs on fault. |
Pinout & Package
TPS54394PWPR uses a 16-pin HTSSOP (PWP) package with exposed PowerPAD thermal pad soldered to PCB ground for enhanced thermal dissipation (θJA = 41.4°C/W). Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Power Input | Independent input rails for each channel; connect to bulk decoupling and 0.1 µF ceramic caps near pins. |
| SW1, SW2 | Switch Node | Drain connections of high-side and source of low-side FETs; route with minimal loop area for EMI control. |
| VBST1, VBST2 | Bootstrap Supply | Drive high-side gate; require 0.1 µF ceramic cap between VBSTx and corresponding SWx pin. |
| EN1, EN2 | Enable Control | Active-high logic inputs (2.0 V threshold); internal 450 kΩ pull-down enables default disable state. |
| VFB1, VFB2 | Feedback Input | Resistor-divider nodes for output voltage regulation; input bias current ±0.4 µA enables high-R dividers. |
| PG1, PG2 | Power Good Output | Open-drain status signals; require external pull-up to regulated rail (e.g., VREG5 or VOx). |
| VREG5 | Internal LDO Output | 5.5 V regulated supply for internal circuitry and bootstrap charging; bypass with ≥1 µF ceramic to GND. |
| GND, PGND1, PGND2 | Ground Returns | GND = signal reference; PGND1/PGND2 = power ground returns for respective low-side FETs and current sense. |
| PowerPAD | Thermal Pad | Exposed copper pad (backside); must be soldered to solid GND plane with ≥6 thermal vias for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Eliminates need for external compensation components while maintaining stability with ceramic or POSCAP output capacitors. |
| Auto-Skip Eco-mode™ | Enables >85% efficiency at 10 mA load by skipping pulses; transitions seamlessly to PWM mode above ~300 mA. |
| Loss-Less Current Sensing | Uses low-side FET rDS(on) with thermal compensation (4000 ppm/°C) - avoids sense resistor power loss and board space. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into powered outputs by gradually enabling synchronous rectification. |
| Hiccup-Mode Overload Protection | Shuts down for 7×UVP enable delay (10.5 ms) on sustained over-current, then auto-retries - limits junction temperature rise. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2 V core), DDR memory (1.5 V), and HDMI interface (3.3 V) in 4K UHD broadcast receivers. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise, fast-transient dual outputs from 12 V DC bus. Use Value: D-CAP2™ delivers <100 mV undershoot on 0–3 A load steps; Eco-mode maintains >82% efficiency at standby current. |
Use Scenario: Power management in DSL/cable modems and Wi-Fi gateways requiring isolated 3.3 V I/O and 1.5 V PHY rails. IC Role / Device Role / Timing Role: Dual-channel buck converter replacing discrete solutions to reduce BOM count and layout complexity. Use Value: Integrated 90/60 mΩ FETs achieve <0.5 W total conduction loss at full load; PowerPAD enables 65°C/W thermal design. |
| Digital Set Top Box (STB) | Gaming Console Subsystem |
Use Scenario: Compact power solution for hybrid STBs integrating satellite tuner, MPEG decoder, and Ethernet PHY. IC Role / Device Role / Timing Role: Dual-output regulator supplying 1.1 V processor core and 3.3 V peripheral bus from 12 V input. Use Value: 1 ms soft-start ensures clean power sequencing; PG1/PG2 provide independent reset signaling to FPGA and MCU. |
Use Scenario: Secondary power stage for GPU voltage tracking, audio codec, and USB controller in portable gaming devices. IC Role / Device Role / Timing Role: High-efficiency dual buck managing dynamic load transients from burst-mode graphics processing. Use Value: 700 kHz switching allows <2.2 µH inductors; low quiescent current (1.2 mA typical) extends battery-backed runtime. |
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 |
|---|---|---|---|
| TPS54395PWPR | Same pinout and electrical specs, but adds adjustable soft-start (via SS pin) and programmable UVLO thresholds. | Suitable where custom power sequencing or brown-out hysteresis is required; not drop-in for fixed 1 ms soft-start designs. | Select TPS54395PWPR only if adjustable soft-start or UVLO configuration is needed; otherwise TPS54394PWPR offers lower cost and simpler layout. |
| MP2451DT-LF-Z | Single-channel 2 A buck (not dual); 3.3–36 V input; no Eco-mode; requires external compensation. | Requires two ICs to match dual 3 A capability; lacks PG, pre-biased start, and integrated bootstrap diodes. | Use MP2451DT-LF-Z only in space-constrained single-rail applications; not functionally equivalent for dual-channel requirements. |
Compared with TPS54394PWPR, TPS54395PWPR adds configurability at minor cost premium, while MP2451DT-LF-Z lacks channel integration, protection features, and efficiency optimization - making TPS54394PWPR the optimal choice for cost-sensitive, dual-rail, high-transient-performance designs.
Availability
TPS54394PWPR is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and gaming console subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54394PWPR 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 TPS54394 belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-transient-response point-of-load regulation in consumer electronics where small size, low EMI, and light-load efficiency are critical.
FAQ
What is the recommended input capacitor configuration for TPS54394PWPR?
TPS54394PWPR requires a minimum 10 µF ceramic input capacitor placed near VIN1/VIN2 pins, plus 0.1 µF ceramic capacitors from each VIN pin to PGND. For high-current or noisy environments, add bulk electrolytic/tantalum (≥47 µF) upstream. All capacitors must have voltage rating exceeding maximum input (e.g., 25 V for 18 V max). The TPS54394PWPR datasheet specifies these values to ensure stable operation and minimize input ripple-induced jitter.
Does TPS54394PWPR support independent enable control for each channel?
Yes, TPS54394PWPR provides fully independent EN1 and EN2 pins, allowing asynchronous startup, staggered sequencing, or individual channel shutdown. Each EN pin has a 2.0 V logic-high threshold and internal 450 kΩ pull-down resistor. This enables flexible power management in multi-rail systems - for example, holding one channel in reset while the other powers up - without requiring external logic. The TPS54394PWPR maintains this independence across all operating modes including Eco-mode and fault recovery.
How does the non-sinking pre-biased soft start work in TPS54394PWPR?
TPS54394PWPR detects when the output voltage exceeds the internal soft-start DAC voltage during startup and delays full synchronous rectification. Instead, it initiates low-side FET gate pulses with narrow, incrementally increasing on-time until reaching normal CCM duty cycle - preventing reverse current flow into pre-biased outputs. This behavior is intrinsic to the TPS54394PWPR control architecture and requires no external components, ensuring safe startup into powered systems like hot-pluggable modules or backplane interfaces.
What thermal management is required for TPS54394PWPR in continuous 3 A operation?
At full 3 A per channel and 12 V input, TPS54394PWPR dissipates ~1.2 W typical. To maintain TJ < 125°C, the HTSSOP-16 PowerPAD must be soldered to a 2-layer PCB with ≥6 thermal vias (0.3 mm diameter) connecting to an internal or bottom-layer solid GND plane. TI's thermal data shows θJA = 41.4°C/W; with proper layout, ambient temperatures up to 70°C are supported. The TPS54394PWPR thermal shutdown triggers at 155°C with 25°C hysteresis, providing robust safety margin.
Can TPS54394PWPR operate with ceramic output capacitors only?
Yes, TPS54394PWPR is explicitly designed for ceramic output capacitors - its D-CAP2™ control architecture eliminates reliance on ESR for loop stability. The datasheet recommends 20–68 µF total ceramic capacitance per channel (e.g., two 22 µF X5R 0805s), with optional feed-forward capacitor for >1.8 V outputs. Using ceramics reduces board area, improves transient response, and avoids aging-related drift - all validated in TI's TPS54394PWPR reference designs and production test data.
TPS54394PWPR 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:
- 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
TPS54394PWPR FAQ
1.How can I place an order for TPS54394PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54394PWPR 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 TPS54394PWPR reliable?
The price and inventory of TPS54394PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54394PWPR is usually 5 days.
3.What payment methods are accepted for TPS54394PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54394PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54394PWPR?
TPS54394PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54394PWPR 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 TPS54394PWPR?
For technical support, including TPS54394PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54394PWPR requirements.
6.How does Aetrix verify that TPS54394PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54394PWPR 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 TPS54394PWPR meets industry standards.
7.What is the process for return or replacement of TPS54394PWPR?
All TPS54394PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54394PWPR, 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 TPS54394PWPR part is unused and in its original packaging.
Return procedure for TPS54394PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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