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Texas Instruments TPS54494PWP
- Part No.:
- TPS54494PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54494PWP.pdf
- Description:
- IC REG BCK ADJ 4A/2A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:345
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Product details
Overview
TPS54494PWP 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, delivering 4 A on Channel 1 and 2 A on Channel 2. It operates across 4.5 V–18 V input, supports 0.76 V–7 V output per channel, and uses D-CAP2™ adaptive on-time control for fast transient response in point-of-load digital TV and STB power supplies.
For engineers reviewing the TPS54494PWP datasheet, TPS54494PWP pinout, TPS54494PWP application, or TPS54494PWP equivalent, key selection criteria include dual-channel current capability, thermal performance in HTSSOP-16 PowerPAD package, Eco-mode™ efficiency at light loads, and lossless low-side current sensing without external sense resistors.
Technical Context
The TPS54494PWP implements D-CAP2™ control with adaptive on-time PWM, enabling pseudo-fixed 700 kHz switching without external compensation while supporting ceramic and polymer output capacitors. Its internal ramp-based reference eliminates ESR dependency and ensures stability under zero-ripple conditions.
Each channel features independent soft-start (1 ms), non-sinking pre-biased startup, cycle-by-cycle over-current protection with thermally compensated rDS(on) sensing, and ±16% power-good monitoring referenced to VFBx. Protection includes UVLO on VREG5, hiccup-mode overload recovery, and thermal shutdown at 155°C with 25°C hysteresis.
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 including 5 V, 12 V, and 15 V bus systems. |
| Output Voltage Range | 0.76 V to 7 V per channel - enables direct regulation of core, I/O, and auxiliary voltages in digital systems. |
| Max Output Current | 4 A (CH1), 2 A (CH2) - sufficient for FPGA I/O banks, SoC peripherals, and multi-rail embedded subsystems. |
| Switching Frequency | ~700 kHz - balances EMI, inductor size, and efficiency; adaptive on-time maintains frequency stability across VIN and VOUT. |
| Feedback Accuracy | ±0.9% (758–773 mV at 25°C) - ensures tight output regulation critical for low-voltage logic and memory interfaces. |
| Thermal Resistance θJA | 41.4 °C/W (HTSSOP-16) - requires minimal PCB copper area for thermal management in compact layouts. |
| Protection Features | OCP, UVP/OVP, UVLO, TSD, hiccup mode - provides autonomous fault handling without external supervision circuitry. |
Pinout & Package
TPS54494PWP is housed in a 16-pin HTSSOP (PWP) package with exposed PowerPAD thermal pad soldered to GND for enhanced heat 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 | Independent 4.5–18 V inputs for each buck stage; also supply VREG5 linear regulator. |
| VBST1 / VBST2 | Bootstrap Supply | Drive high-side FET gates; require 0.1 µF ceramic capacitor to respective SWx pins. |
| SW1 / SW2 | Switch Node | Drain connections of both high- and low-side FETs; connect to external inductors and output filters. |
| PGND1 / PGND2 | Power Ground | Low-side FET source returns and current-sense reference; separate paths reduce noise coupling. |
| EN1 / EN2 | Enable Input | CMOS-compatible logic enable (2.0 V H-threshold, 0.4 V L-threshold); supports independent channel sequencing. |
| VFB1 / VFB2 | Feedback Input | Resistor-divider input for output voltage regulation; internal 765 mV reference with ±115 ppm/°C drift. |
| PG1 / PG2 | Power-Good Output | Open-drain status signals indicating ±16% output regulation; 1.5 ms delay on assert, 2 µs on deassert. |
| VREG5 | 5.5 V Regulator Output | Internal LDO supplying gate drivers and bias circuits; requires ≥1 µF ceramic bypass to GND. |
| GND | Signal Ground | Reference for sensitive analog blocks (VFBx, SSx); must be star-connected to minimize noise. |
| Exposed Pad | Thermal Pad | Electrically connected to GND; mandatory soldering required for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Eliminates external compensation components and enables stable operation with ultra-low-ESR ceramic capacitors. |
| Loss-Less Current Sensing | Uses low-side FET rDS(on) for cycle-by-cycle OCP - no sense resistor, no power loss, no layout sensitivity. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into pre-charged outputs - essential for hot-swap and rail-sequencing applications. |
| Eco-mode™ Operation | Auto-skips pulses at light loads to maintain >85% efficiency down to 10 mA, extending battery life in standby modes. |
| Integrated 5.5 V LDO (VREG5) | Self-powered gate drivers and internal circuitry - removes need for external bias supply and simplifies BOM. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Dual-rail power delivery for main SoC (1.2 V), DDR memory (1.5 V), and HDMI interface (3.3 V) in 4K UHD television platforms. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing tightly regulated, low-noise, fast-transient power to voltage-sensitive video processing ICs. Use Value: D-CAP2™ control delivers <100 ns load-step response with <20 mV deviation, preserving signal integrity during dynamic scene changes. | Use Scenario: Compact power solution for cable modems and fiber ONTs requiring isolated 3.3 V and 1.5 V rails from shared 12 V input. IC Role / Device Role / Timing Role: Dual-channel buck converter managing independent power domains for PHY, MAC, and RF front-end subsystems. Use Value: Independent EN1/EN2 pins enable precise power-up sequencing aligned with IEEE 802.3af timing requirements. |
| Digital Set Top Box (STB) | Gaming Console Core Logic |
Use Scenario: Powering ARM-based application processor, video decoder, and USB 3.0 controller in low-cost HD STB designs. IC Role / Device Role / Timing Role: Main DC/DC regulator delivering 1.1 V core and 1.8 V I/O rails with coordinated soft-start and PG signaling. Use Value: 1 ms fixed soft-start and ±16% PG window ensure reliable boot under varying input line conditions and cold temperature starts. | Use Scenario: Secondary power stage for GPU voltage tracking and memory I/O regulation in portable gaming handhelds. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying 0.95 V GPU core and 1.2 V GDDR6 interface from 5 V battery-derived input. Use Value: Eco-mode™ sustains >90% efficiency at 50 mA idle current, directly extending gameplay time between charges. |
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 |
|---|---|---|---|
| TPS544B20RHLR | Higher current (15 A CH1, 5 A CH2), 3.5 V–20 V input, 0.6 V–5.5 V output, 500 kHz fixed frequency, QFN-32 package. | Suitable for higher-power server and telecom applications; lacks D-CAP2™ and Eco-mode™. | Select when >4 A per channel is required and fixed-frequency EMI control is prioritized over light-load efficiency. |
| MP2451DT-LF-Z | Single-channel 2 A buck, 4.5 V–28 V input, 0.8 V–15 V output, 500 kHz fixed frequency, SOIC-8 package. | Requires two units for dual-rail use; no integrated VREG5 or PG outputs; lower integration density. | Choose only for cost-sensitive, space-tolerant single-rail designs where dual-channel integration is not mandatory. |
Compared with TPS54494PWP, TPS544B20RHLR offers greater current headroom but sacrifices light-load efficiency and ease of design due to fixed-frequency control and external compensation. MP2451DT-LF-Z reduces integration and adds complexity for dual-rail implementation, making it less suitable for compact, low-noise consumer electronics.
Availability
TPS54494PWP is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top box designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54494PWP 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 technologies with decades of expertise in high-reliability DC/DC conversion.
The TPS54494 belongs to TI's D-CAP2™ synchronous buck converter product line, engineered specifically for high-efficiency, low-component-count point-of-load regulation in space-constrained consumer and computing applications.
FAQ
What is the recommended input capacitor configuration for TPS54494PWP?
TPS54494PWP requires a minimum 10 µF ceramic input capacitor near VIN1/VIN2 pins, plus 0.1 µF ceramic capacitors from Pin 1 (VIN1) and Pin 16 (VIN2) to PGND. These reduce high-frequency switching noise and stabilize the input rail during load transients. The capacitor voltage rating must exceed the maximum input voltage, and X5R/X7R dielectrics are preferred for stable capacitance across temperature and bias.
Does TPS54494PWP support independent enable and power-good signaling per channel?
Yes, TPS54494PWP provides fully independent EN1/EN2 inputs and PG1/PG2 open-drain outputs. Each EN pin controls its respective channel's operation, allowing staggered startup or dynamic channel disable. Each PG pin asserts high when its output voltage remains within ±16% of the target for ≥1.5 ms, enabling system-level power sequencing and fault detection without external logic.
How does the D-CAP2™ control mode in TPS54494PWP improve transient response compared to traditional voltage-mode control?
TPS54494PWP's D-CAP2™ control uses adaptive on-time modulation with an internal ramp that simulates output ripple, eliminating dependence on capacitor ESR for loop stability. This allows immediate response to load steps-typically <100 ns-without external compensation networks. Traditional voltage-mode controllers require careful pole-zero placement and are slower to correct deviations, especially with ceramic output capacitors.
Can TPS54494PWP operate with pre-biased outputs during startup?
Yes, TPS54494PWP implements non-sinking pre-biased soft start. When enabled into a pre-charged output, it gradually ramps the low-side FET on-time from zero, preventing reverse current flow and avoiding output voltage droop or overshoot. This feature is critical in hot-plug, redundant power, and multi-rail sequencing applications where output capacitors may retain charge.
What thermal considerations apply to TPS54494PWP in HTSSOP-16 (PWP) package?
TPS54494PWP in HTSSOP-16 has θJA = 41.4 °C/W. To maintain junction temperature ≤125°C at full load, the PCB must provide ≥200 mm² of 2-oz copper connected to the exposed PowerPAD, which must be soldered to GND. Thermal vias (≥6×0.3 mm) under the pad are strongly recommended. Ambient temperature must stay ≤85°C, and derating applies above 60°C ambient.
TPS54494PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-HTSSOP
TPS54494PWP FAQ
1.How can I place an order for TPS54494PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54494PWP 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 TPS54494PWP reliable?
The price and inventory of TPS54494PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54494PWP is usually 5 days.
3.What payment methods are accepted for TPS54494PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54494PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54494PWP?
TPS54494PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54494PWP 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 TPS54494PWP?
For technical support, including TPS54494PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54494PWP requirements.
6.How does Aetrix verify that TPS54494PWP is sourced from the original manufacturer or authorized distributors?
All TPS54494PWP 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 TPS54494PWP meets industry standards.
7.What is the process for return or replacement of TPS54494PWP?
All TPS54494PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54494PWP, 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 TPS54494PWP part is unused and in its original packaging.
Return procedure for TPS54494PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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