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Texas Instruments CSD95481RWJ
- Part No.:
- CSD95481RWJ
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 41-PowerTFQFN
- Datasheet:
-
CSD95481RWJ.pdf
- Description:
- IC HALF BRIDGE DRIVER 60A 41VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,048
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Product details
Overview
CSD95481RWJ from Texas Instruments is a synchronous buck NexFET™ Smart Power Stage integrating driver IC and dual power MOSFETs in a single 5-mm × 6-mm VQFN-CLIP package. It delivers 60-A continuous output current, supports up to 1.25-MHz switching frequency, and features integrated bi-directional current sensing with temperature compensation and analog temperature output (TAO). It is designed for high-density VR12.x/VR13.x voltage regulator applications in server and graphics cards.
For engineers reviewing the CSD95481RWJ datasheet, CSD95481RWJ pinout, CSD95481RWJ application, or CSD95481RWJ equivalent, key selection criteria include its 60-A continuous current rating, tri-state PWM compatibility, diode emulation mode via EN/FCCM, integrated bootstrap switch, and thermally enhanced topside-cooled QFN-CLIP package with 41 terminals.
Technical Context
The CSD95481RWJ implements a fully integrated synchronous buck power stage with monolithic driver and optimized high-side/low-side MOSFETs. Its control architecture accepts tri-state PWM inputs and supports both Forced Continuous Conduction Mode (FCCM) and Diode Emulation Mode, selected via the EN/FCCM pin's voltage level and tri-state hold-off timing.
It integrates precision current sensing using an external LSET resistor and REFIN reference, delivering proportional IOUT voltage output. The TAO/FLT pin provides a temperature-proportional analog voltage with built-in ORing diode for multiphase thermal monitoring, while VOS enables accurate output voltage sensing for current sense calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Continuous Output Current | 60 A at VIN = 12 V, VOUT = 1.2 V, fSW = 500 kHz - enables single-phase support for high-current CPU/GPU core rails. |
| Switching Frequency | Up to 1250 kHz - allows compact magnetics and fast transient response in space-constrained POL designs. |
| Efficiency | >95% at 30 A - reduces system power loss and thermal load in multi-phase VR modules. |
| Junction Temperature Range | –40°C to +125°C - supports operation in thermally demanding server and AI accelerator environments. |
| Package Thermal Resistance | θJB = 2.2°C/W - enables effective heat transfer to PCB ground plane via exposed thermal pad. |
| Input Voltage Range | VIN = 4.5 V to 16 V - compatible with 5-V, 12-V intermediate bus architectures in modern computing platforms. |
| PWM Logic Compatibility | 3.3-V and 5-V logic levels - interoperable with TI's TPS53679 and other industry-standard VR controllers. |
Pinout & Package
The CSD95481RWJ uses a thermally enhanced 41-pin VQFN-CLIP (RWJ) package with 5.0 mm × 6.0 mm footprint, featuring an exposed metal thermal pad on the top side for direct heatsink attachment and optimized inductance reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 25–30) | High-side MOSFET drain input | Accepts main DC input; requires local high-frequency decoupling capacitors for low-impedance path to PGND. |
| VSW (Pins 10–19) | Phase node (HS source / LS drain) | Connects directly to output inductor; critical for minimizing parasitic inductance in high-dI/dt switching paths. |
| PGND (Pins 5, 7–9, 20–24, 40) | Power ground return | Multiple low-inductance ground connections reduce voltage bounce and improve current sensing accuracy. |
| PWM (Pin 34) | Tri-state gate control input | Logic high → HS ON / LS OFF; logic low → HS OFF / LS ON; Hi-Z → both FETs off after T3HT timeout. |
| EN/FCCM (Pin 35) | Mode selection & enable | High → FCCM; floating/low → disable; tri-state hold → diode emulation mode for light-load efficiency. |
| TAO/FLT (Pin 36) | Temperature amplifier output | Analog voltage proportional to die temperature; integrated ORing diode enables shared thermal monitoring in multiphase systems. |
| IOUT (Pin 38) | Current sense amplifier output | Voltage output referenced to REFIN; enables real-time phase current monitoring without external shunt. |
| LSET (Pin 37) | Inductor value programming | Resistor-to-PGND sets gain for internal current sensing - eliminates need for external gain resistors or calibration. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Switch | Eliminates external bootstrap diode and reduces component count while maintaining reliable HS gate drive under all duty cycles. |
| Temperature-Compensated Bi-Directional Current Sense | Enables accurate inductor current measurement across full load and temperature range without external amplifiers or calibration. |
| Optimized Dead Time for Shoot-Through Protection | Prevents simultaneous conduction of HS and LS FETs - ensures robust operation without requiring controller-level dead-time tuning. |
| Thermally Enhanced Topside Cooling | Exposed top metal pad allows direct thermal interface to heatsink or cold plate - improves thermal performance beyond standard QFN limits. |
| System-Optimized PCB Footprint | Minimizes loop area for VIN–VSW–PGND paths and integrates thermal vias - simplifies layout and enhances EMI performance. |
Applications
| Server VR12.x/VR13.x Core Rails | AI Accelerator POL Converters |
|---|---|
|
Use Scenario: High-current, fast-transient voltage regulation for multi-core Xeon or EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Synchronous buck power stage providing regulated Vcore with dynamic phase shedding coordination. Use Value: 60-A continuous rating and 1.25-MHz capability enable fewer phases per rail, reducing BOM cost and board area while maintaining tight voltage regulation. |
Use Scenario: Point-of-load conversion for GPU or ASIC fabric voltage domains requiring sub-1V outputs with <100-ns transient response. IC Role / Device Role / Timing Role: High-frequency power stage supporting interleaved multiphase control with precise current sharing. Use Value: Integrated current and temperature sensing simplifies closed-loop feedback design and enables per-phase health monitoring in mission-critical AI hardware. |
| Graphics Card Memory VRMs | High-Density Telecom POL Modules |
|
Use Scenario: Compact, high-efficiency power delivery to GDDR6X memory stacks on PCIe-based GPU cards. IC Role / Device Role / Timing Role: Single-phase buck stage operating at >1 MHz to minimize inductor size and meet strict height constraints (<6 mm). Use Value: Ultra-low-inductance package and optimized PCB footprint reduce EMI and allow placement directly beneath memory modules. |
Use Scenario: Distributed 12-V-to-3.3-V or 5-V conversion in carrier-grade baseband units with limited airflow and high ambient temperatures. IC Role / Device Role / Timing Role: Thermally robust power stage leveraging topside cooling to sustain 60-A output without forced air. Use Value: θJB = 2.2°C/W and –40°C to +125°C rating ensure stable operation in sealed, convection-cooled telecom enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck power stage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CSD95492QVM | Same 41-pin VQFN-CLIP package; rated for 70-A continuous current; higher RDS(on) on LS FET (0.45 mΩ vs. 0.38 mΩ); identical pinout and feature set. | Better suited for ultra-high-current single-phase designs where margin above 60 A is required; shares same PCB layout. | Select CSD95492QVM when peak current exceeds 60 A or when derating headroom is needed for extended lifetime at elevated temperature. |
| TPS53679 | Multi-phase VR controller (not a power stage); 6-bit DAC, SMBus interface, AVP/AVS support; requires external power stages like CSD95481RWJ. | Complementary controller IC - not a drop-in replacement; used upstream to drive CSD95481RWJ in multiphase configurations. | Choose TPS53679 only as a controller companion; it does not replace CSD95481RWJ but enables advanced sequencing, telemetry, and adaptive voltage positioning. |
Compared with CSD95481RWJ, CSD95492QVM offers higher current headroom in identical packaging, while TPS53679 serves a fundamentally different role as a digital multiphase controller - neither is pin-compatible, but both are commonly deployed together in VR13.x server VRMs.
Availability
CSD95481RWJ is available at Aetrix Electronics and suitable for server VRMs, AI accelerator POL converters, graphics card memory regulators, and telecom baseband power systems requiring stable component supply and long-term industrial availability.
Supply support for CSD95481RWJ 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 company specializing in analog, embedded processing, and power management technologies, with decades of leadership in power conversion ICs and silicon solutions.
The CSD95481RWJ belongs to TI's NexFET™ Smart Power Stage product line, engineered specifically for high-frequency, high-current synchronous buck conversion in datacenter, AI, and graphics applications where density, efficiency, and thermal performance are critical.
FAQ
What is the maximum continuous output current rating for the CSD95481RWJ?
The CSD95481RWJ is rated for 60-A continuous output current under specified conditions: VIN = 12 V, VOUT = 1.2 V, fSW = 500 kHz, and TA = 25°C. This rating assumes proper PCB thermal design with adequate copper area and thermal vias connected to the exposed thermal pad. Derating applies at higher ambient temperatures or lower input voltages.
Does the CSD95481RWJ support diode emulation mode, and how is it enabled?
Yes, the CSD95481RWJ supports diode emulation mode to improve light-load efficiency. It is enabled by driving the EN/FCCM pin into the tri-state window (between 0.9 V and 2.0 V) and holding it there for longer than the tri-state hold-off time (T3HT). When active, the low-side FET conducts like a diode during discontinuous conduction, eliminating reverse recovery losses.
How does the CSD95481RWJ implement current sensing without an external shunt resistor?
The CSD95481RWJ uses integrated MOSFET on-resistance (RDS(on)) sensing with temperature compensation. It measures voltage across the low-side FET during conduction and scales the result using the LSET resistor value and internal gain. The IOUT pin outputs a voltage referenced to REFIN, enabling accurate bi-directional current measurement without external components.
What is the purpose of the TAO/FLT pin on the CSD95481RWJ?
TAO/FLT is a dual-function pin: it outputs an analog voltage proportional to junction temperature (TAO), and pulls up to 3.3 V during thermal shutdown (FLT). Its integrated ORing diode allows multiple CSD95481RWJ devices in a multiphase system to share a single monitoring line - only the highest temperature is reported, simplifying thermal management firmware.
Is the CSD95481RWJ pin-compatible with other NexFET™ power stages such as CSD95492QVM?
Yes, the CSD95481RWJ and CSD95492QVM share identical 41-pin VQFN-CLIP (RWJ) packaging, pin assignment, and footprint. They are functionally compatible and support drop-in replacement in existing layouts, though CSD95492QVM offers higher 70-A continuous current rating and slightly different RDS(on) values.
CSD95481RWJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- NexFET™
- Package/Case:
- 41-PowerTFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Half Bridge (3)
- Applications:
- Synchronous Buck Converters
- Interface:
- PWM
- Load Type:
- Inductive, Capacitive
- Technology:
- Power MOSFET
- Rds On (Typ):
- -
- Current - Output / Channel:
- 60A
- Current - Peak Output:
- 90A
- Voltage - Supply:
- 4.5V ~ 5.5V
- Voltage - Load:
- 4.5V ~ 16V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- Bootstrap Circuit
- Fault Protection:
- Shoot-Through
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 41-VQFN-CLIP (5x6)
CSD95481RWJ FAQ
1.How can I place an order for CSD95481RWJ through Aetrix?
Please submit a Request for Quotation (RFQ) for CSD95481RWJ 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 CSD95481RWJ reliable?
The price and inventory of CSD95481RWJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CSD95481RWJ is usually 5 days.
3.What payment methods are accepted for CSD95481RWJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CSD95481RWJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CSD95481RWJ?
CSD95481RWJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CSD95481RWJ 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 CSD95481RWJ?
For technical support, including CSD95481RWJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CSD95481RWJ requirements.
6.How does Aetrix verify that CSD95481RWJ is sourced from the original manufacturer or authorized distributors?
All CSD95481RWJ 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 CSD95481RWJ meets industry standards.
7.What is the process for return or replacement of CSD95481RWJ?
All CSD95481RWJ units undergo pre-shipment inspection (PSI). If there is an issue with CSD95481RWJ, 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 CSD95481RWJ part is unused and in its original packaging.
Return procedure for CSD95481RWJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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