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Texas Instruments TPS54494PWPR
- Part No.:
- TPS54494PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54494PWPR.pdf
- Description:
- IC REG BCK ADJ 4A/2A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
TPS54494PWPR 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 from 4.5 V to 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 digital TV and STB power supplies.
For engineers reviewing the TPS54494PWPR datasheet, TPS54494PWPR pinout, TPS54494PWPR application, or TPS54494PWPR equivalent, key selection criteria include its dual-output capability, thermally compensated cycle-by-cycle over-current protection, non-sinking pre-biased soft start, 700 kHz pseudo-fixed switching frequency, and compatibility with ceramic output capacitors without external compensation.
Technical Context
The TPS54494PWPR implements D-CAP2™ control-combining adaptive on-time PWM with internal ripple simulation-to achieve stable regulation across ultra-low-ESR ceramic and polymer capacitors without external loop compensation. Its two independent control loops support seamless transition between continuous conduction mode (CCM) at heavy loads and Auto-Skip Eco-mode™ at light loads.
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 outputs (PG1/PG2) with ±16% voltage window and 1.5 ms enable delay. The device integrates a 5.5 V linear regulator (VREG5) for gate drive and logic supply, powered from VIN1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer input rails including 5 V, 12 V, and 15 V systems. |
| 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. |
| Channel 1 Output Current | 4 A continuous - sufficient for FPGA core or SoC power domains requiring high transient current. |
| Channel 2 Output Current | 2 A continuous - suitable for memory, interface, or peripheral subsystems with lower current demand. |
| Switching Frequency | ~700 kHz - pseudo-fixed frequency set by VIN/VO ratio; balances efficiency, size, and EMI performance. |
| Feedback Reference Accuracy | ±0.9% (758–773 mV at 25°C) - ensures tight output regulation critical for sensitive digital loads. |
| Thermal Shutdown Threshold | 155°C with 25°C hysteresis - protects against sustained overload while allowing safe operation up to 150°C junction temperature. |
Pinout & Package
TPS54494PWPR is housed in a 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad (pin 16). The package measures 4.4 mm × 5.0 mm × 1.2 mm and requires soldering the thermal pad to a PCB ground plane for optimal thermal performance (θJA = 41.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 1) | Power Input | Main input for Channel 1 and supply for internal 5.5 V LDO (VREG5); must be decoupled with ≥10 µF ceramic capacitor. |
| VBST1 (Pin 2) | Bootstrap Supply | Provides gate drive voltage for CH1 high-side FET; requires 0.1 µF ceramic capacitor to SW1. |
| SW1 (Pin 3) | Switch Node | Connection point between CH1 high- and low-side FETs; drives external inductor and forms LC filter with output capacitor. |
| PGND1 (Pin 4) | Power Ground | Return path for CH1 low-side FET and current sense; must be routed separately from SGND to minimize noise coupling. |
| EN1 (Pin 5) | Enable Input | Active-high logic control (2.0 V threshold); enables CH1 independently; internal pull-down ensures default disable. |
| PG1 (Pin 6) | Power-Good Output | Open-drain signal indicating CH1 output is within ±16% of target; requires external pull-up for system sequencing. |
| VFB1 (Pin 7) | Feedback Input | Connects to resistor divider from VO1; sets output voltage with 765 mV nominal reference; input bias < ±0.4 µA. |
| GND (Pin 8) | Signal Ground | Reference for VFBx, SSx, and analog circuitry; must connect to PGND at single-point star ground near IC. |
| VREG5 (Pin 9) | LDO Output | 5.5 V regulated supply for internal logic and gate drivers; bypassed with ≥1 µF ceramic capacitor to GND. |
| VFB2 (Pin 10) | Feedback Input | CH2 feedback node; identical electrical behavior to VFB1; supports independent output voltage programming. |
| PG2 (Pin 11) | Power-Good Output | CH2-specific open-drain PG signal; synchronized with CH2 soft-start and UVP/OVP detection. |
| EN2 (Pin 12) | Enable Input | Independent active-high enable for CH2; allows staggered startup or dynamic channel disabling. |
| PGND2 (Pin 13) | Power Ground | CH2 low-side FET return; isolated from PGND1 to prevent cross-channel current-sense interference. |
| SW2 (Pin 14) | Switch Node | CH2 switch node; connects to second inductor; shares same layout constraints as SW1 for EMI control. |
| VBST2 (Pin 15) | Bootstrap Supply | CH2 high-side gate drive supply; requires dedicated 0.1 µF ceramic capacitor to SW2. |
| VIN2 (Pin 16) | Power Input | Input for Channel 2 only; may be tied to VIN1 or supplied independently for rail isolation. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Eliminates need for external compensation components while supporting ceramic and polymer output capacitors - reduces BOM count and improves transient response. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup when output is pre-charged - essential for hot-swap and multi-rail sequencing applications. |
| Loss-Less Low-Side rDS(on) Sensing | Enables accurate cycle-by-cycle over-current protection without sense resistors - preserves efficiency and simplifies layout. |
| Thermally Compensated OCP | Current limit threshold remains stable across temperature (4000 ppm/°C drift) - ensures consistent fault protection from –40°C to 85°C ambient. |
| Auto-Skip Eco-mode™ | Reduces switching losses at light loads by skipping pulses - maintains >85% efficiency down to 10 mA output current. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers main SoC, DDR memory, and video processing ASIC in 4K UHD television platforms with strict standby power and thermal limits. IC Role / Device Role / Timing Role: Dual-output buck controller providing 1.2 V core and 3.3 V I/O rails with independent sequencing and PG monitoring. Use Value: D-CAP2™'s fast transient response handles bursty video decoding loads without excessive output capacitance; Eco-mode™ meets Energy Star standby requirements. | Use Scenario: Supplies multiple voltage rails in residential gateways, DSL/cable modems, and Wi-Fi routers where space and efficiency are constrained. IC Role / Device Role / Timing Role: Generates 1.5 V PHY and 3.3 V interface rails with independent EN control for power domain isolation during sleep modes. Use Value: Integrated 5.5 V VREG5 powers internal logic and eliminates need for external bias supply; HTSSOP package fits dense router PCB layouts. |
| Digital Set Top Box (STB) | Gaming Console Subsystem |
Use Scenario: Delivers tightly regulated power to ARM-based media processors and HDMI transceivers in pay-TV STBs operating 24/7. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying 1.1 V CPU core and 1.8 V memory rails with hiccup-mode overload protection. Use Value: ±0.9% reference accuracy and ±16% PG window ensure compliance with STB thermal derating specs; thermal shutdown prevents field failures. | Use Scenario: Powers auxiliary subsystems such as audio codecs, USB controllers, and sensor hubs in handheld and console gaming devices. IC Role / Device Role / Timing Role: Secondary power stage generating 1.5 V and 3.3 V from main 5 V or 12 V bus with minimal external components. Use Value: Non-sinking pre-biased soft start avoids voltage droop during game launch sequences; compact HTSSOP footprint saves board area. |
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 (4 A/4 A), 3.5 V–20 V input, 0.6 V–5.5 V output, integrated PMBus interface, 16-pin VQFN. | Requires digital configuration and telemetry; not pin-compatible; suited for server/industrial systems needing telemetry. | Select when PMBus monitoring, tighter output accuracy (±0.5%), or matched dual 4 A channels are required. |
| MP8845GQ-Z | 4 A/2 A dual buck, 2.5 V–18 V input, 0.6 V–7 V output, 750 kHz fixed frequency, no integrated VREG5, QFN-20. | Lacks integrated 5.5 V LDO and pre-biased soft start; different pinout and thermal pad layout. | Select when lower input voltage start-up (2.5 V) or higher light-load efficiency via forced PWM is preferred. |
Compared with TPS54494PWPR, TPS544B20RJER adds digital control but increases design complexity and cost, while MP8845GQ-Z offers broader input range but omits critical features like VREG5 and non-sinking soft start - making TPS54494PWPR optimal for cost-sensitive consumer electronics with analog sequencing needs.
Availability
TPS54494PWPR 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 production continuity, and RoHS-compliant packaging.
Supply support for TPS54494PWPR 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 TPS54494 belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for cost-sensitive, space-constrained consumer electronics requiring fast transient response and minimal external components.
FAQ
What is the recommended input capacitor configuration for TPS54494PWPR?
TPS54494PWPR requires a minimum 10 µF ceramic input capacitor at VIN1 and VIN2, plus 0.1 µF ceramic capacitors placed directly between each VBSTx pin and its corresponding SWx pin. A bulk electrolytic or polymer capacitor (≥47 µF) is recommended for systems with long input traces or high source impedance to suppress low-frequency ripple and maintain stability under dynamic load conditions.
Does TPS54494PWPR support independent enable and power-good signaling per channel?
Yes, TPS54494PWPR provides fully independent control and monitoring: EN1 and EN2 allow separate activation of Channel 1 and Channel 2, while PG1 and PG2 deliver open-drain power-good signals with ±16% voltage window and 1.5 ms delay after soft-start completion - enabling precise multi-rail sequencing in complex SoC power trees.
Can TPS54494PWPR operate with ceramic output capacitors only, and what is the minimum recommended value?
Yes, TPS54494PWPR is explicitly designed for ceramic output capacitors without external compensation. The datasheet recommends 20 µF to 68 µF total capacitance per channel (e.g., two 22 µF X5R 0805 capacitors), with ESR ≤ 5 mΩ. Ceramic-only designs leverage D-CAP2™'s internal ripple simulation and eliminate ESR-dependent stability concerns.
What is the thermal performance difference between the HTSSOP and VQFN packages for TPS54494PWPR?
The HTSSOP (PWP) package used in TPS54494PWPR has θJA = 41.4°C/W, while the VQFN (RSA) variant has θJA = 32.8°C/W due to superior bottom-side thermal conduction. Both require soldered thermal pads, but the VQFN achieves lower junction temperature under identical load and PCB layout - making it preferable for high-ambient or high-power-density applications.
How does the non-sinking pre-biased soft start function in TPS54494PWPR during system power-up?
When the output is pre-biased above the soft-start target, TPS54494PWPR initially activates the low-side FET with narrow, incrementally increasing on-times instead of forcing full synchronous rectification. This prevents reverse current flow from the output into the converter, avoiding voltage droop and potential damage to upstream sources - a critical feature for hot-plug and multi-supply systems.
TPS54494PWPR 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:
- 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
TPS54494PWPR FAQ
1.How can I place an order for TPS54494PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54494PWPR 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 TPS54494PWPR reliable?
The price and inventory of TPS54494PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54494PWPR is usually 5 days.
3.What payment methods are accepted for TPS54494PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54494PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54494PWPR?
TPS54494PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54494PWPR 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 TPS54494PWPR?
For technical support, including TPS54494PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54494PWPR requirements.
6.How does Aetrix verify that TPS54494PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54494PWPR 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 TPS54494PWPR meets industry standards.
7.What is the process for return or replacement of TPS54494PWPR?
All TPS54494PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54494PWPR, 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 TPS54494PWPR part is unused and in its original packaging.
Return procedure for TPS54494PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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