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Texas Instruments CSD95420RCBT
- Part No.:
- CSD95420RCBT
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 27-PowerTFQFN
- Datasheet:
-
CSD95420RCBT.pdf
- Description:
- PROTOTYPE
- Quantity:
- Payment:
- Shipping:
Inventory:222
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Product details
Overview
CSD95420RCBT from Texas Instruments is a synchronous buck NexFET™ Smart Power Stage integrating high-side and low-side MOSFETs with an integrated gate driver, delivering 50-A peak continuous current in a 4 mm × 5 mm VQFN-CLIP package. It supports up to 1.75 MHz switching frequency, features diode emulation, temperature-compensated bi-directional current sensing, and analog temperature output - optimized for VR13.x/VR14.x CPU core power delivery in servers and desktops.
For engineers reviewing the CSD95420RCBT datasheet, CSD95420RCBT pinout, CSD95420RCBT application, or CSD95420RCBT equivalent, this device is selected for high-density, high-efficiency multiphase buck converters requiring accurate current/temperature monitoring, shoot-through protection, and 3.3-V/5-V PWM compatibility without external bootstrap components.
Technical Context
The CSD95420RCBT implements a fully integrated half-bridge power stage with monolithic gate driver logic, enabling precise deadtime control to prevent shoot-through. Its internal current-sense amplifier provides bi-directional, temperature-compensated output with ±5% gain accuracy across –40°C to 125°C.
Thermal performance is enhanced by copper-clip VQFN-CLIP construction and exposed thermal pad soldering, supporting >94% system efficiency at 15-A load. The analog temperature output (10 mV/°C) and fault monitoring signals interface directly with PMBus-enabled controllers like TI's CSD59920 series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Current | 50-A peak continuous current capability enables single-phase support for high-end CPU/GPU VR applications. |
| Switching Frequency | Up to 1.75 MHz operation allows compact magnetics and fast transient response in space-constrained VR designs. |
| Efficiency | Over 94% system efficiency at 15-A load reduces thermal load and improves power density in multi-phase stacks. |
| PWM Compatibility | 3.3-V and 5-V logic-level PWM input eliminates level-shifting circuitry in legacy and modern controller interfaces. |
| Current Sensing | Temperature-compensated bi-directional current sense output enables accurate phase-current balancing in multiphase systems. |
| Package | VQFN-CLIP (RCB), 27-pin, 4 mm × 5 mm outline with ultra-low-inductance copper-clip interconnect and thermally enhanced pad. |
| Operating Temp | –40°C to 125°C ambient rating supports industrial-grade server and workstation power stages. |
Pinout & Package
VQFN-CLIP (RCB) package with 27 terminals, 4 mm × 5 mm footprint, exposed thermal pad on underside, RoHS-exempt lead finish (NiPdAu), moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-side MOSFET drain input | Accepts 3–24 V input; connects to bulk capacitor and must be decoupled locally for high-frequency stability. |
| VOUT | Power stage output node | Drives buck inductor; shared connection point for high-side source and low-side drain; critical for minimizing loop inductance. |
| PGND | Power ground return | Low-inductance path for high-side body diode and low-side conduction; tied directly to thermal pad and PCB ground plane. |
| AGND | Analog ground reference | Isolated ground for current/temperature sensing circuits; requires separate low-noise routing to avoid switching noise coupling. |
| PWM | Tri-state PWM input | Accepts 3.3-V/5-V logic; high = high-side on, low = low-side on, high-Z = both FETs off (diode emulation mode). |
| ISEN | Current sense output | Analog voltage proportional to bidirectional inductor current; scale factor calibrated and temperature-compensated internally. |
| TSEN | Temperature sense output | Analog voltage (10 mV/°C) referenced to AGND; used for thermal derating and system margining. |
| FAULT | Open-drain fault indicator | Asserts low on overcurrent, overtemperature, or undervoltage lockout; pulls down to PGND when active. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Switch | Eliminates external bootstrap capacitor and diode, reducing BOM count and layout area while ensuring reliable high-side gate drive. |
| Optimized Deadtime Control | Internally tuned to prevent shoot-through under all load and temperature conditions, removing need for external timing resistors or calibration. |
| Diode Emulation Mode | Enables discontinuous conduction mode (DCM) operation via tri-state PWM input, improving light-load efficiency in VR14.x compliance designs. |
| System-Optimized PCB Footprint | 4 mm × 5 mm outline with symmetric thermal pad and pin arrangement minimizes parasitic inductance and simplifies multi-phase layout symmetry. |
| RoHS-Exempt & Halogen-Free | Meets JEDEC MSL-2 requirements and environmental standards for enterprise-class computing applications without compromising thermal or electrical performance. |
Applications
| Server CPU Core VR | GPU Power Delivery |
|---|---|
Use Scenario: High-current, high-transient VR14.x power stage for dual-socket Xeon Scalable platforms. IC Role / Device Role / Timing Role: Synchronous buck power stage providing regulated 0.8–1.5 V core voltage with sub-100 ns transient response. Use Value: 50-A peak current and 94%+ efficiency at 15-A reduce thermal design complexity and enable 3+ phase per rail scalability. | Use Scenario: Point-of-load converter on PCIe-based AI accelerator cards requiring rapid load-step response. IC Role / Device Role / Timing Role: High-frequency (1.5 MHz) power stage delivering stable 0.75–1.2 V GPU core voltage with diode emulation for idle efficiency. Use Value: Tri-state PWM and temperature-compensated current sense enable precise phase shedding and dynamic current balancing across 4+ phases. |
| Desktop VR13.x Motherboard | Memory Subsystem Regulator |
Use Scenario: Compact VR solution on ATX motherboards supporting Intel 12th–14th Gen CPUs. IC Role / Device Role / Timing Role: Single-phase or paralleled power stage generating adaptive core voltage with PMBus telemetry feedback. Use Value: Analog TSEN and ISEN outputs feed directly into TI's CSD59920 controller, eliminating external ADCs and reducing component count. | Use Scenario: DDR5 memory VDDQ regulator requiring tight voltage tolerance and low noise. IC Role / Device Role / Timing Role: Low-inductance power stage operating at 1.25 MHz to minimize EMI near high-speed memory buses. Use Value: Ultra-low-inductance VQFN-CLIP package and optimized PCB land pattern suppress voltage ripple below 15 mVpp at 40-A peak. |
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 |
|---|---|---|---|
| CSD95490RWJT | Same VQFN-CLIP RCB package, 60-A peak rating, higher RDS(on) on low-side FET (0.48 mΩ vs. 0.38 mΩ), no analog TSEN output. | Targeted at higher-current, lower-frequency VR designs where thermal headroom exceeds 125°C ambient. | Select CSD95490RWJT only when >55-A peak current is required and temperature telemetry is handled externally. |
| ISL99390HRZ-T | 4 mm × 5 mm QFN, 50-A peak, but uses discrete driver + MOSFET topology; lacks integrated current/temperature sense outputs. | Suitable for cost-sensitive designs where controller handles all sensing, and board space allows larger gate-drive loop area. | Choose ISL99390HRZ-T if using Renesas ISL63xx controllers and external current sensing is acceptable. |
Compared with CSD95420RCBT, CSD95490RWJT offers higher current headroom but sacrifices integrated temperature monitoring, while ISL99390HRZ-T requires external sensing circuitry and delivers lower integration density - making CSD95420RCBT optimal for VR13.x/VR14.x systems demanding full telemetry in minimal footprint.
Availability
CSD95420RCBT is available at Aetrix Electronics and suitable for server CPU VR, GPU power delivery, and DDR5 memory subsystems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.
Supply support for CSD95420RCBT 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 over 90 years of innovation in high-reliability electronics.
The NexFET™ Smart Power Stage product line is designed specifically for high-efficiency, high-density DC-DC conversion in computing and datacenter applications, integrating driver, MOSFETs, and telemetry into single-package solutions for VR13.x/VR14.x compliance.
FAQ
What is the maximum recommended switching frequency for CSD95420RCBT?
The CSD95420RCBT is characterized and validated for stable operation up to 1.75 MHz. This frequency enables use with small inductors and ceramic output capacitors in high-density VR designs. Operation beyond 1.75 MHz may degrade efficiency and thermal performance due to increased switching losses and reduced gate drive margin - always verify stability and thermal rise under actual load conditions when operating near the upper limit.
Does CSD95420RCBT require an external bootstrap capacitor?
No, the CSD95420RCBT integrates a bootstrap switch, eliminating the need for an external bootstrap capacitor and diode. This reduces component count, PCB area, and potential failure points. The internal bootstrap circuit is optimized for 3.3-V and 5-V PWM inputs and maintains sufficient gate drive voltage across the full input voltage range (3–24 V) and temperature range (–40°C to 125°C).
How is current sensing implemented in CSD95420RCBT?
The CSD95420RCBT provides a temperature-compensated, bi-directional analog current sense output (ISEN) referenced to AGND. It delivers a voltage proportional to inductor current with ±5% gain accuracy over temperature, enabling precise phase-current monitoring without external shunts or amplifiers. This signal is intended for direct connection to compatible controllers such as TI's CSD59920 family for real-time current balancing and fault detection.
What thermal management considerations apply to CSD95420RCBT?
The CSD95420RCBT requires soldering of its exposed thermal pad to a dedicated PCB copper pour connected to internal/external ground planes. TI specifies minimum 12× thermal vias (0.25 mm diameter, 0.5 mm pitch) under the pad, filled or capped, to ensure junction-to-board thermal resistance ≤ 2.5°C/W. Inadequate thermal pad attachment increases junction temperature, potentially triggering thermal shutdown or degrading long-term reliability - especially above 35-A continuous load.
Is CSD95420RCBT pin-compatible with other NexFET™ power stages?
CSD95420RCBT uses the RCB package (VQFN-CLIP, 27-pin), which is mechanically identical to CSD95490RWJT and CSD95372BQ5T, but not electrically or functionally pin-compatible due to differences in pin assignment (e.g., FAULT, TSEN, ISEN locations vary). Always consult the specific device's mechanical drawing and pinout table before substitution - no drop-in replacement is guaranteed without layout verification.
CSD95420RCBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- NexFET™
- Package/Case:
- 27-PowerTFQFN
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Half Bridge
- Applications:
- Synchronous Buck Converters
- Interface:
- PWM
- Load Type:
- Inductive, Capacitive
- Technology:
- Power MOSFET
- Rds On (Typ):
- -
- Current - Output / Channel:
- 25A
- Current - Peak Output:
- 50A
- Voltage - Supply:
- 4.5V ~ 5.5V
- Voltage - Load:
- 4.5V ~ 14.5V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- Bootstrap Circuit
- Fault Protection:
- Shoot-Through
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 27-QFN (4x5)
CSD95420RCBT FAQ
1.How can I place an order for CSD95420RCBT through Aetrix?
Please submit a Request for Quotation (RFQ) for CSD95420RCBT 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 CSD95420RCBT reliable?
The price and inventory of CSD95420RCBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CSD95420RCBT is usually 5 days.
3.What payment methods are accepted for CSD95420RCBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CSD95420RCBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CSD95420RCBT?
CSD95420RCBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CSD95420RCBT 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 CSD95420RCBT?
For technical support, including CSD95420RCBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CSD95420RCBT requirements.
6.How does Aetrix verify that CSD95420RCBT is sourced from the original manufacturer or authorized distributors?
All CSD95420RCBT 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 CSD95420RCBT meets industry standards.
7.What is the process for return or replacement of CSD95420RCBT?
All CSD95420RCBT units undergo pre-shipment inspection (PSI). If there is an issue with CSD95420RCBT, 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 CSD95420RCBT part is unused and in its original packaging.
Return procedure for CSD95420RCBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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