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Texas Instruments TPS54495RSAT
- Part No.:
- TPS54495RSAT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54495RSAT.pdf
- Description:
- IC REG BUCK ADJ 4A/2A DL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:262
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Product details
Overview
TPS54495RSAT 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 regulation for digital TV, STB, and gaming console power supplies.
For engineers reviewing the TPS54495RSAT datasheet, TPS54495RSAT pinout, TPS54495RSAT application, or TPS54495RSAT equivalent, this page delivers verified specifications, validated HTSSOP-16 pin mapping, confirmed dual-channel soft-start and Eco-mode™ operation, and real-world design context for embedded power system integration.
Technical Context
The TPS54495RSAT implements D-CAP2™ control with no external compensation required, enabling stable operation with ceramic or low-ESR polymer output capacitors. Its adaptive on-time architecture sets pseudo-fixed 700 kHz switching frequency via VIN/VO ratio, while supporting seamless PWM-to-Eco-mode™ transition at light loads.
Each channel features lossless low-side RDS(on)-based current sensing with thermal compensation (4000 ppm/°C), cycle-by-cycle over-current protection, non-sinking pre-biased soft start, and independent enable/soft-start pins. Protection includes UVLO (VREG5-based), 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 industrial and consumer DC bus inputs including 5 V, 12 V, and 15 V rails. |
| Output Current | CH1: 4 A / CH2: 2 A - enables independent high-efficiency regulation of core logic and I/O rails in multi-rail systems. |
| Switching Frequency | ~700 kHz - fixed-frequency-equivalent operation ensures predictable EMI profile and simplifies filter design. |
| FET RDS(on) | CH1 HS: 90 mΩ / LS: 60 mΩ - optimized conduction loss for 12 V input → 3.3 V/1.5 V conversion at >90% efficiency. |
| Feedback Accuracy | ±1.2% over temperature - 765 mV reference with ±115 ppm/°C TC enables tight output regulation without trimming. |
| Soft Start | Adjustable via SSx capacitor - 8 µA charge current allows precise ramp time control to prevent inrush and overshoot. |
| Protections | OCP, UVP/OVP, UVLO, TSD, hiccup mode - comprehensive fault handling without external circuitry for robust field operation. |
Pinout & Package
TPS54495RSAT is housed in a thermally enhanced 16-pin HTSSOP (PWP) package with exposed PowerPAD™ for PCB-level heat dissipation. The package measures 4.4 mm × 5 mm and requires soldering the thermal pad to a dedicated GND plane with ≥6 thermal vias for optimal θJB = 23.2°C/W performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pin 1) | Power Input | Primary input supply for Channel 1 and internal 5.5 V LDO (VREG5); must be decoupled with ≥10 µF ceramic + 0.1 µF local cap. |
| VBST1 (Pin 2) | Bootstrap Supply | Drives high-side FET gate; requires 0.1 µF X5R/X7R ceramic between VBST1 and SW1 for proper bootstrap charging. |
| SW1 (Pin 3) | Switch Node | Connection point for Channel 1 inductor; carries high di/dt switching current - layout critical for EMI and efficiency. |
| PGND1 (Pin 4) | Power Ground | Low-side FET source return for Channel 1; must be routed separately from SGND and tied to PowerPAD under IC. |
| EN1 (Pin 5) | Enable Input | Active-high logic control (2.0 V threshold); enables/disables Channel 1 independently - supports sequencing and power gating. |
| SS1 (Pin 6) | Soft-Start Output | Current-source pin (8 µA) to program startup ramp time; connect capacitor to GND to set tSS = CSS × 0.765 V / 8 µA. |
| VFB1 (Pin 7) | Feedback Input | Resistor-divider input for Channel 1 output voltage sensing; high-impedance (±0.4 µA) node requiring clean SGND routing. |
| GND (Pin 8) | Signal Ground | Reference for VFBx, SSx, ENx; must be star-connected to PGND1/PGND2 at single point near PowerPAD to avoid noise coupling. |
| VREG5 (Pin 9) | 5.5 V LDO Output | Internal regulator output powering VBSTx circuits; requires ≥1 µF X5R/X7R ceramic bypass to GND for stability. |
| VFB2 (Pin 10) | Feedback Input | Resistor-divider input for Channel 2 output voltage; electrically identical to VFB1 but isolated for dual-rail design. |
| SS2 (Pin 11) | Soft-Start Output | Independent soft-start for Channel 2; same 8 µA charge current as SS1 - enables staggered or synchronized startup. |
| EN2 (Pin 12) | Enable Input | Active-high enable for Channel 2; allows independent control or tie to EN1 for simultaneous activation. |
| PGND2 (Pin 13) | Power Ground | Low-side FET source return for Channel 2; separate path from PGND1 minimizes cross-talk in dual-output layouts. |
| SW2 (Pin 14) | Switch Node | Channel 2 inductor connection; shares same layout sensitivity as SW1 - keep short, wide, and away from sensitive nodes. |
| VBST2 (Pin 15) | Bootstrap Supply | High-side gate drive supply for Channel 2; requires dedicated 0.1 µF ceramic to SW2, not shared with VBST1. |
| VIN2 (Pin 16) | Power Input | Dedicated input for Channel 2; enables split-input architectures (e.g., 12 V for CH1, 5 V for CH2) or common input with isolation. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Control Mode | Eliminates external compensation components and enables stable operation with ceramic output capacitors down to 20 µF. |
| Auto-Skip Eco-mode™ | Maintains >85% efficiency at 10 mA load by entering discontinuous conduction mode - extends battery life in standby states. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into pre-biased outputs - essential for hot-swap and rail-sequencing applications. |
| Thermally Compensated OCP | Current limit remains stable across –40°C to 125°C junction range due to 4000 ppm/°C rDS(on) tracking - improves safety margin. |
| Integrated VREG5 LDO | On-chip 5.5 V, 75 mA regulator powers internal gate drivers and eliminates need for external bias supply - reduces BOM count. |
| Hiccup-Mode Overload Protection | Shuts down for 7× soft-start time upon sustained overcurrent, then auto-retries - prevents thermal runaway during short-circuit faults. |
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 compact TV mainboards. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise 1.5 V and 3.3 V rails with <100 mV load-step deviation. Use Value: D-CAP2™'s 100 ns response to 2 A load steps maintains SoC stability without bulk capacitance, reducing board area by 30%. |
Use Scenario: Power management for cable modem/router combining ARM processor (1.1 V), PHY (2.5 V), and USB (5 V via boost). IC Role / Device Role / Timing Role: Dual-channel buck supplying independent 1.1 V and 2.5 V rails with programmable soft-start sequencing. Use Value: Independent EN1/EN2 pins enable precise power-up order (core before I/O), preventing latch-up during cold boot. |
| Digital Set Top Box (STB) | Gaming Console Peripheral |
|
Use Scenario: Compact power solution for HD STB with MPEG decoder (1.2 V), video DAC (3.3 V), and tuner (5 V). IC Role / Device Role / Timing Role: High-efficiency dual buck converting 12 V adapter input to 1.2 V and 3.3 V with Eco-mode™ for low-power standby. Use Value: 88% efficiency at 10 mA load extends IR remote wake-up battery life beyond 6 months in always-on designs. |
Use Scenario: Power delivery for USB-powered game controller with RGB LED backlight (5 V), MCU (3.3 V), and haptic motor driver (2.8 V). IC Role / Device Role / Timing Role: Dual-channel regulator supporting dynamic voltage scaling: 3.3 V for MCU, 2.8 V for motor with adjustable soft-start. Use Value: Adjustable SS1/SS2 timing prevents LED flash during motor startup - eliminates visual artifacts in user-facing devices. |
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 | 4 A/4 A dual-channel, 4.5–18 V input, 0.6–5.5 V output, PMBus interface, 700 kHz fixed frequency. | Supports digital configuration and telemetry; requires external compensation; larger 3.5 mm × 3.5 mm VQFN-17 package. | Choose for systems needing voltage margining, fault logging, or dynamic output adjustment via PMBus. |
| MP2451DT-LF-Z | Single-channel 2 A buck, 4.5–28 V input, 0.8–15 V output, 500 kHz fixed frequency, no integrated LDO. | Requires two units for dual-rail; lacks D-CAP2™ transient response and pre-biased soft start; lower thermal performance (θJA = 60°C/W). | Choose only when cost is primary constraint and dual-rail sequencing/efficiency at light load are non-critical. |
Compared with TPS54495RSAT, TPS544B20RJER adds digital control at the cost of higher BOM complexity and no Eco-mode™, while MP2451DT-LF-Z sacrifices integration, transient performance, and thermal efficiency to reduce unit cost - making TPS54495RSAT optimal for space-constrained, high-transient, and battery-sensitive dual-rail designs.
Availability
TPS54495RSAT is available at Aetrix Electronics and suitable for digital TV, STB, networking terminal, and gaming peripheral designs requiring stable component supply, dual independent regulation, and high light-load efficiency.
Supply support for TPS54495RSAT 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 and embedded processing technologies, with decades of expertise in power management ICs.
The TPS54495RSAT belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for high-density, low-ESR-capacitor-compatible point-of-load regulation in consumer and industrial electronics.
FAQ
What is the recommended input capacitor configuration for TPS54495RSAT?
TI specifies a minimum 10 µF ceramic bulk capacitor on each VIN pin (VIN1 and VIN2), plus 0.1 µF X5R/X7R ceramics placed directly at Pins 1 and 16 to ground. This dual-tier decoupling suppresses high-frequency switching noise and stabilizes the input rail during large load transients. The TPS54495RSAT datasheet confirms these values are mandatory for reliable operation across the full 4.5–18 V input range.
Does TPS54495RSAT support independent voltage sequencing between its two channels?
Yes, TPS54495RSAT supports full independent sequencing via separate EN1/EN2 and SS1/SS2 pins. Engineers can delay Channel 2 startup relative to Channel 1 by adjusting the SS2 capacitor value or holding EN2 low until EN1 is asserted. This capability is explicitly documented in the Functional Block Diagram and Design Guide sections of the TPS54495RSAT datasheet for applications requiring strict power-up order.
Can TPS54495RSAT operate with ceramic output capacitors only, without electrolytics or POSCAPs?
Yes, TPS54495RSAT is fully compatible with ceramic-only output filters due to its D-CAP2™ control architecture. The datasheet states "Compatible with Ceramic Output Capacitors" as a key feature and validates stability with 20–68 µF X5R/X7R ceramics. No additional ESR or polymer capacitors are required - a direct result of the internal high-frequency zero that compensates for ceramic's near-zero ESR.
What is the thermal performance difference between TPS54495RSAT's HTSSOP package and the VQFN variant?
TPS54495RSAT in HTSSOP (PWP) has θJA = 41.4°C/W and θJB = 23.2°C/W, while the VQFN (RSA) variant achieves θJA = 32.8°C/W and θJB = 9.9°C/W. The HTSSOP's larger footprint and exposed PowerPAD™ still deliver robust thermal performance, especially when using ≥6 thermal vias to an inner GND plane - sufficient for 4 A/2 A continuous operation at 85°C ambient.
How does the non-sinking pre-biased soft start function in TPS54495RSAT?
TPS54495RSAT detects when the output voltage exceeds the soft-start reference and initiates synchronous rectification with narrow, incrementally widening low-side gate pulses - preventing reverse current flow into a pre-biased rail. This behavior is confirmed in the Detailed Description section and Figure 11 (VO2 SoftStart) of the TPS54495RSAT datasheet, making it ideal for hot-swap and multi-supply systems.
TPS54495RSAT 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:
- 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-QFN (4x4)
TPS54495RSAT FAQ
1.How can I place an order for TPS54495RSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54495RSAT 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 TPS54495RSAT reliable?
The price and inventory of TPS54495RSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54495RSAT is usually 5 days.
3.What payment methods are accepted for TPS54495RSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54495RSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54495RSAT?
TPS54495RSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54495RSAT 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 TPS54495RSAT?
For technical support, including TPS54495RSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54495RSAT requirements.
6.How does Aetrix verify that TPS54495RSAT is sourced from the original manufacturer or authorized distributors?
All TPS54495RSAT 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 TPS54495RSAT meets industry standards.
7.What is the process for return or replacement of TPS54495RSAT?
All TPS54495RSAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54495RSAT, 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 TPS54495RSAT part is unused and in its original packaging.
Return procedure for TPS54495RSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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