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Texas Instruments UCD74120RVFT
- Part No.:
- UCD74120RVFT
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
UCD74120RVFT.pdf
- Description:
- IC REG BUCK 25A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
UCD74120RVFT from Texas Instruments is a high-current synchronous buck power stage integrating a dual-gate driver and two NexFET™ N-channel MOSFETs in a single 40-pin PQFN PowerStack™ package. It delivers 25-A continuous output current, supports 4.7–14-V input voltage, operates up to 2 MHz switching frequency, and features DCR-based current sensing with IMON monitor output - enabling precise load current feedback for digital PWM controllers in point-of-load (POL) applications.
For engineers reviewing the UCD74120RVFT datasheet, UCD74120RVFT pinout, UCD74120RVFT application, or UCD74120RVFT equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application mappings, and two rigorously cross-checked alternative parts - all grounded in TI's SLUSAV8 production data sheet (October 2012).
Technical Context
The UCD74120RVFT implements a thermally enhanced multi-chip module architecture combining gate drive logic, high-side/low-side FETs, and analog current sensing in one compact 5 mm × 7 mm PQFN. Its synchronous mode uses anti-cross-conduction dead-time control via SW node sensing and automatic fault-triggered high-side shutdown.
It supports dual operational modes: synchronous mode (SRE_MD = high), where PWM controls both FETs with built-in timing coordination; and independent mode (SRE_MD = low), where PWM drives only the high-side FET and SRE directly controls the low-side FET - with no internal dead-time logic active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25-A continuous - enables direct powering of high-performance DSPs and ASICs without external current sharing. |
| Input Voltage Range | 4.7 V to 14 V - compatible with standard 5 V, 12 V intermediate bus architectures in telecom and networking systems. |
| Switching Frequency | Up to 2 MHz - supports high-density, small-output-filter designs while maintaining stable regulation under transient loads. |
| High-Side RDS(on) | 6.5 mΩ max at 25°C - minimizes conduction loss and thermal rise during high-current operation. |
| Low-Side RDS(on) | 2.7 mΩ max at 25°C - reduces synchronous rectification losses and improves light-load efficiency. |
| Current Sense Gain | 50.2 V/V - provides accurate, temperature-stable load current monitoring via IMON pin for closed-loop controller feedback. |
| Thermal Resistance θJC(bot) | 0.8 °C/W - enables efficient heat transfer from die to PCB ground plane through exposed thermal pad. |
Pinout & Package
UCD74120RVFT is housed in a 40-pin, 5 mm × 7 mm PQFN PowerStack™ package (RVF suffix) with an exposed thermal pad electrically connected to PGND. The package supports high-power density layouts and requires solder paste stencil optimization for thermal pad reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Return path for all analog circuits except low-side gate driver; must be connected to PGND at single-point star ground near pin 1. |
| VIN (21–26) | High-side power input | Direct connection to input bus; multiple pins reduce IR drop and improve current handling for 25-A operation. |
| PGND (13–20) | Power ground return | Low-impedance path for low-side FET and gate driver currents; ties to thermal pad for optimal thermal performance. |
| PWM (38) | Digital control input | Tri-state–capable interface accepting 3.3 V/5 V logic; detects high-impedance state to disable both FETs safely. |
| SRE_MD (30) | Mode select input | Configures synchronous (high) or independent (low) FET control - must be hard-wired, not dynamically switched. |
| IMON (33) | Analog current monitor output | Voltage proportional to load current: VIMON = 0.5 V + 50.2 × (VCSP − VCSN) - feeds back to controller for real-time current limiting. |
| FLT (29) | Fault flag output | Active-high 3.3 V digital signal asserted on overcurrent, overtemperature, or UVLO - triggers immediate controller response. |
| HS_SNS (28) | High-side fault sense input | Connects via 2-kΩ resistor to high-side FET drain - enables fast overcurrent detection with blanking time set by RDLY. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NexFET™ MOSFETs | Eliminates discrete FET selection, layout, and gate drive matching - reduces BOM count and improves thermal coupling between devices. |
| DCR current sensing | Enables accurate, lossless current measurement using inductor DCR - avoids sense resistor power loss and board space. |
| Tri-state PWM input | Automatically disables both FETs when controller enters high-impedance state - prevents shoot-through during startup or fault recovery. |
| Programmable current limit | Voltage on ILIM pin (0.5–3.0 V range) sets overcurrent threshold on IMON - allows flexible, system-level current protection tuning. |
| Adaptive anti-cross-conduction | Monitors SW node voltage to enforce dead time - ensures safe commutation without fixed delay programming or external timing components. |
Applications
| Telecom POL Converter | ASIC Core Supply |
|---|---|
|
Use Scenario: High-efficiency, space-constrained 12 V-to-1.2 V conversion for baseband processors in 5G remote radio units. IC Role / Device Role / Timing Role: Primary synchronous buck power stage delivering regulated core voltage with real-time current telemetry via IMON. Use Value: 25-A capability and 2.7 mΩ low-side RDS(on) enable >92% efficiency at full load while supporting rapid load transients required by burst-mode processing. |
Use Scenario: Dynamic voltage scaling supply for FPGA or SoC in network switch line cards requiring precise current monitoring. IC Role / Device Role / Timing Role: Digitally controlled power stage interfacing with TI's UCD92xx series digital PWM controllers via PWM/SRE_MD/FLT signals. Use Value: DCR sensing and IMON output provide controller-accessible current data without adding sense resistors - preserving PCB area and thermal margin. |
| Pre-biased Load Startup | Thermally Constrained Module |
|
Use Scenario: Powering pre-charged loads such as hot-swap backplanes or battery-backed subsystems. IC Role / Device Role / Timing Role: Synchronous rectifier disable via SRE pin during startup - forces body-diode conduction to avoid reverse current flow. Use Value: Controlled soft-start into existing output voltage eliminates inrush-induced rail collapse and protects downstream circuitry. |
Use Scenario: Compact DC-DC module in sealed industrial enclosure with limited airflow and ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Thermally optimized power stage leveraging 0.8 °C/W θJC(bot) and exposed PGND thermal pad for direct PCB copper heatsinking. Use Value: Junction temperature remains below 125°C at 25-A load with minimal copper area - avoids need for external heatsinks or forced air. |
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 |
|---|---|---|---|
| LM5119RTWT | Controller-only IC (no integrated FETs); requires external high/low-side MOSFETs and gate drivers. | Supports wider VIN (4.5–100 V) but lacks integrated current sensing and IMON output - needs external amplifiers and comparators. | Choose when higher input voltage or custom FET selection is required; not drop-in for UCD74120RVFT footprint or function. |
| TPS53632GRTAR | Single-chip 35-A buck converter with integrated FETs and PMBus interface - includes digital telemetry but no HS_SNS fault pin. | Targets server VR13/IMVP8 compliance; lacks tri-state PWM and SRE_MD configurable mode - fixed synchronous operation only. | Choose for digitally managed systems needing PMBus reporting; requires redesign due to different pinout, control protocol, and thermal profile. |
Compared with LM5119RTWT and TPS53632GRTAR, the UCD74120RVFT uniquely combines integrated NexFETs, tri-state–aware PWM, programmable current limit via ILIM, and analog IMON telemetry in a thermally optimized PQFN - making it optimal for analog/digital hybrid POL designs where layout simplicity and fault responsiveness are critical.
Availability
UCD74120RVFT is available at Aetrix Electronics and suitable for telecom infrastructure, ASIC power delivery, and industrial POL converters requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for UCD74120RVFT 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-efficiency power conversion ICs.
The UCD74120RVFT belongs to TI's UCD7xxx family of high-current power stages, designed specifically to complement digital and analog PWM controllers in high-density, high-reliability POL applications for networking and computing systems.
FAQ
What is the maximum operating junction temperature for UCD74120RVFT?
The UCD74120RVFT has a maximum operating junction temperature of 125°C under recommended conditions, with thermal shutdown activation at 155–175°C (rising threshold). Its θJC(bot) of 0.8 °C/W enables reliable operation at full 25-A load when mounted on ≥2 oz copper with adequate thermal vias - verified per TI SLUSAV8 datasheet Section 3.2.
Does UCD74120RVFT support both analog and digital PWM controllers?
Yes, UCD74120RVFT is explicitly designed to complement both analog and digital PWM controllers. Its tri-state–capable PWM input, FLT fault flag, and IMON analog current monitor output provide seamless interface to TI's UCD92xx digital controllers or conventional analog ICs like TL494 - as confirmed in the device description and application diagram of SLUSAV8.
How is current sensing implemented in UCD74120RVFT?
UCD74120RVFT implements differential current sensing via CSP and CSN pins, supporting either discrete shunt resistors or inductor DCR sensing. The internal amplifier provides 50.2 V/V gain with 0.5 V offset, producing a voltage on IMON proportional to load current - detailed in Electrical Characteristics Table 3.5 and Section 5.10 of SLUSAV8.
What is the purpose of the SRE_MD pin on UCD74120RVFT?
The SRE_MD pin configures UCD74120RVFT's operational mode: when pulled high (e.g., to BP3), it enables synchronous mode where PWM controls both FETs with automatic dead-time; when pulled low (to AGND), it enables independent mode where PWM drives only the high-side FET and SRE directly controls the low-side FET - per Section 5.4 of SLUSAV8.
Can UCD74120RVFT operate with an externally supplied gate drive voltage?
Yes, UCD74120RVFT supports external VGG supply: tie VGG_DIS high and apply 4.6–6.5 V to the VGG pin. When VGG_DIS is low, the internal linear regulator generates ~6.4 V from VIN. Both configurations are validated in Recommended Operating Conditions (Section 3.3) and Pin Functions (Section 4) of SLUSAV8.
UCD74120RVFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-PowerLFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 25A
- Frequency - Switching:
- Up to 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-LQFN-CLIP (7x5)
UCD74120RVFT FAQ
1.How can I place an order for UCD74120RVFT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD74120RVFT 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 UCD74120RVFT reliable?
The price and inventory of UCD74120RVFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD74120RVFT is usually 5 days.
3.What payment methods are accepted for UCD74120RVFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD74120RVFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD74120RVFT?
UCD74120RVFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD74120RVFT 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 UCD74120RVFT?
For technical support, including UCD74120RVFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD74120RVFT requirements.
6.How does Aetrix verify that UCD74120RVFT is sourced from the original manufacturer or authorized distributors?
All UCD74120RVFT 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 UCD74120RVFT meets industry standards.
7.What is the process for return or replacement of UCD74120RVFT?
All UCD74120RVFT units undergo pre-shipment inspection (PSI). If there is an issue with UCD74120RVFT, 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 UCD74120RVFT part is unused and in its original packaging.
Return procedure for UCD74120RVFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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