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Texas Instruments UCD74111RVFR
- Part No.:
- UCD74111RVFR
- Manufacturer:
- Texas Instruments
- Package:
- 40-PowerLFQFN
- Datasheet:
-
UCD74111RVFR.pdf
- Description:
- IC REG BUCK 15A 40LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,953
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Product details
Overview
UCD74111RVFR from Texas Instruments is a high-current synchronous buck power stage integrating dual NexFET™ MOSFETs and gate drivers in a single 40-pin PQFN package. It delivers 15-A continuous output current, supports 4.7–14-V input, operates up to 2 MHz switching frequency, and features DCR-based current sensing with IMON output for real-time load monitoring - ideal for powering DSP/ASIC loads in point-of-load (POL) converters.
For engineers reviewing the UCD74111RVFR datasheet, UCD74111RVFR pinout, UCD74111RVFR application, or UCD74111RVFR equivalent, key selection considerations include its integrated thermal shutdown (155°C rising threshold), tri-state PWM input for power-stage shutdown, built-in high-side current protection with blanking delay control via RDLY, and compatibility with digital PWM controllers requiring precise current feedback and fault flag signaling.
Technical Context
The UCD74111RVFR implements a two-stage synchronous buck architecture with independent high-side and low-side gate drivers, each optimized for fast charge/discharge of NexFET power MOSFETs (RHI = 6.5 mΩ, RLO = 2.7 mΩ at 25°C). Its adaptive anti-cross-conduction logic-enabled in SRE_MD-high mode-monitors HS_SNS and enforces dead time without external timing components.
Current sensing uses switched-capacitor differential amplification (GCS = 50.2 V/V) on CSP/CSN inputs, generating a voltage-proportional IMON output (0.5 V offset + 50.2×(VCSP−VCSN)) with 5 Msps sampling rate and ±100 mV to 3.1 V usable range. Fault detection includes overcurrent (via ILIM threshold 0.5–3.0 V), UVLO (VGG-ON = 4.6 V), and thermal shutdown (TTSD-R = 165°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 15-A continuous - enables compact POL designs for DSP/ASIC without external current-handling components. |
| Input Voltage Range | 4.7 V to 14 V - supports standard intermediate bus voltages in telecom and networking systems. |
| Switching Frequency | Up to 2 MHz - allows smaller magnetics and faster transient response in space-constrained applications. |
| High-Side RDS(on) | 6.5 mΩ max at 25°C - minimizes conduction loss and thermal rise under full load. |
| Current Sense Gain | 50.2 V/V with 0.5-V offset - provides linear, temperature-stable IMON output directly usable by ADCs or digital controllers. |
| Fault Response Time | tFAULT-FLT = 475 ns max - enables cycle-by-cycle overcurrent protection before MOSFET damage occurs. |
| Thermal Shutdown | Rising threshold = 165°C, hysteresis = 20°C - prevents thermal runaway while allowing safe recovery after cooling. |
Pinout & Package
UCD74111RVFR is housed in a thermally enhanced 40-pin PQFN PowerStack™ package (5 mm × 7 mm) with exposed thermal pad connected internally to PGND. The package supports high-power density layouts and requires solder paste stencil optimization for the thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND | Analog ground reference | Return for all analog circuits except low-side driver; must be star-connected to PGND near AGND pin to avoid noise coupling. |
| VIN (Pins 21–26) | High-side power input | Direct connection to input bus; multiple pins reduce trace resistance and improve current sharing. |
| SW (Pin 9) | Switching node | Common drain connection of both FETs; requires low-inductance layout and optional RC snubber to suppress >100 MHz ringing. |
| BOOT (Pin 5) | High-side floating supply | Drives high-side gate via bootstrap capacitor (≥0.22 µF, ≥16 V); series 5–10 Ω resistor slows turn-on to reduce SW node overshoot. |
| CSP / CSN (Pins 36 / 35) | Differential current sense inputs | Accept DCR or shunt-based sensing; require matched 2.49-kΩ series resistors near pins for optimal common-mode rejection. |
| IMON (Pin 33) | Current monitor output | Analog voltage proportional to load current (0.5 V + 50.2×ΔV); directly interfaces with controller ADCs or analog comparators. |
| FLT (Pin 29) | Fault flag output | Open-drain 3.3-V signal asserting high on overcurrent, overtemperature, or UVLO; resets on next PWM falling edge if fault clears. |
| PWM (Pin 38) | Tri-state compatible control input | Accepts 3.3-V/5-V logic; detects high-impedance state (0.8–2.5 V for >600 ns) to disable both FETs - critical for safe power-down sequences. |
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 output current monitoring using inductor DCR instead of power-wasting shunt resistors. |
| Programmable overcurrent threshold | Voltage on ILIM pin (0.5–3.0 V range) sets fault trip point - allows dynamic scaling based on system margin requirements. |
| Synchronous/Independent mode select | SRE_MD pin configures operation: synchronous mode (anti-cross-conduction enabled) or independent mode (PWM/SRE direct control). |
| On-chip VGG regulator | Generates 6.4-V gate drive from VIN; disable via VGG_DIS to support external 4.6–6.5-V supplies - increases flexibility in multi-rail systems. |
Applications
| Digital POL Power Modules | Telecom DC-DC Converters |
|---|---|
|
Use Scenario: Powering TI C6000 DSPs and Xilinx Kintex-7 FPGAs in baseband processing units with tight transient response requirements. IC Role / Device Role / Timing Role: Primary synchronous buck power stage delivering regulated 1.2 V @ 15 A; IMON feeds back to UCD9248 digital controller for closed-loop current limiting. Use Value: Integrated current sensing eliminates external op-amp and ADC, reducing solution size by 35% versus discrete power stage + sense amplifier designs. |
Use Scenario: Intermediate bus conversion in 48-V telecom rectifiers feeding distributed 12-V/5-V rails for packet processors and SerDes PHYs. IC Role / Device Role / Timing Role: High-efficiency 48-V-to-12-V step-down stage operating at 1.2 MHz; FLT signal triggers system-level fault logging and graceful shutdown. Use Value: 28.9°C/W θJA and 0.8°C/W θJCbot enable 15-A operation without forced air, cutting cooling cost in NEBS-compliant chassis. |
| ASIC Core Voltage Regulation | Networking Switch ASIC Supplies |
|
Use Scenario: Providing core voltage (0.85 V) to Broadcom BCM568xx switch ASICs with <100-ns load-step response. IC Role / Device Role / Timing Role: Fast-switching (2 MHz) power stage synchronized to digital controller clock; RDLY pin sets 125-ns blanking window to reject switching-edge noise on HS_SNS. Use Value: Sub-500-ns fault detection ensures ASIC protection during short-circuit events without relying on slower system-level supervision. |
Use Scenario: Dual-phase 1.8-V supply for Marvell Alaska 88E1512 Ethernet PHYs in 10G/25G line cards with strict EMI limits. IC Role / Device Role / Timing Role: Single-phase stage in multiphase bank; SRE_MD tied high for synchronous mode with automatic dead-time insertion to minimize shoot-through risk. Use Value: Built-in anti-cross-conduction logic removes need for external timing ICs or complex gate-drive transformer design. |
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 |
|---|---|---|---|
| LM5116PWPR | Controller-only IC (no integrated FETs); requires external high/low-side MOSFETs and gate drivers. | Used where higher voltage (up to 100 V) or custom FET selection is needed; lacks IMON and FLT integration. | Select when designing for >14-V input or needing >15-A scalability via paralleled FETs. |
| TPS53679RSBT | Single-chip 60-A buck converter with integrated drivers and FETs; uses different current sensing (RDS(on)-based) and no RDLY programmability. | Targets server VR13/VR14 CPU/GPU rails; supports PMBus interface and multi-phase synchronization not present in UCD74111RVFR. | Select for high-current, digitally managed CPU cores where telemetry and phase interleaving are required. |
Compared with LM5116PWPR and TPS53679RSBT, the UCD74111RVFR offers unique value in mid-power (≤15 A), analog/digital hybrid POL designs where integrated current monitoring, fast fault reporting, and compact 5×7-mm footprint outweigh the need for ultra-high current or digital interface capabilities.
Availability
UCD74111RVFR is available at Aetrix Electronics and suitable for digital POL power modules, telecom DC-DC converters, and ASIC core voltage regulation requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for UCD74111RVFR 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 UCD74111RVFR belongs to TI's UCD digital power ecosystem and was designed specifically for seamless interoperability with UCD9xxx digital PWM controllers - enabling rapid deployment of intelligent, current-monitored POL solutions.
FAQ
What is the maximum continuous output current rating for the UCD74111RVFR?
The UCD74111RVFR is rated for 15-A continuous output current under recommended operating conditions (TJ ≤ 125°C, VIN = 12 V). This rating assumes proper PCB thermal design with the exposed thermal pad soldered to a minimum 200 mm² copper area. Peak current capability exceeds 30 A for short durations, limited by IOCH = 30 A overcurrent threshold and thermal constraints.
How does the UCD74111RVFR implement current sensing without a shunt resistor?
The UCD74111RVFR supports DCR (inductor DC resistance) current sensing via CSP and CSN pins. It measures the voltage drop across the inductor's parasitic resistance using switched-capacitor differential amplification (gain = 50.2 V/V), adding a fixed 0.5-V offset to generate the IMON output. This eliminates power loss and board space associated with discrete shunt resistors while maintaining accuracy across temperature.
Can the UCD74111RVFR operate with an externally supplied gate drive voltage?
Yes - the UCD74111RVFR supports external VGG supply. When VGG_DIS is pulled high to BP3, the internal VGG linear regulator is disabled, and an external 4.6–6.5-V source must be applied to the VGG pin. A 4.7-µF ceramic capacitor must be placed between VGG and PGND. This mode is used when tighter gate voltage control or lower noise than the internal regulator provides is required.
What is the purpose of the RDLY pin on the UCD74111RVFR?
The RDLY pin sets the blanking time for the high-side current sense comparator and overcurrent protection circuitry. A resistor (5.00–25.00 kΩ) from RDLY to AGND programs tBLANK between 110–140 ns. This blanking window prevents false overcurrent trips caused by switching-edge transients on HS_SNS, ensuring reliable fault detection only during steady-state conduction.
Does the UCD74111RVFR support tri-state PWM input for controlled shutdown?
Yes - the UCD74111RVFR's PWM pin includes integrated tri-state detection. When the input voltage remains within 0.8–2.5 V for >600 ns (tHLD-R), the device interprets this as high-impedance and forces both high-side and low-side gate drives LOW. This feature enables safe, controller-initiated power-stage disable without requiring additional logic or sequencing circuitry.
UCD74111RVFR 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:
- 15A
- 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)
UCD74111RVFR FAQ
1.How can I place an order for UCD74111RVFR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD74111RVFR 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 UCD74111RVFR reliable?
The price and inventory of UCD74111RVFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD74111RVFR is usually 5 days.
3.What payment methods are accepted for UCD74111RVFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD74111RVFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD74111RVFR?
UCD74111RVFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD74111RVFR 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 UCD74111RVFR?
For technical support, including UCD74111RVFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD74111RVFR requirements.
6.How does Aetrix verify that UCD74111RVFR is sourced from the original manufacturer or authorized distributors?
All UCD74111RVFR 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 UCD74111RVFR meets industry standards.
7.What is the process for return or replacement of UCD74111RVFR?
All UCD74111RVFR units undergo pre-shipment inspection (PSI). If there is an issue with UCD74111RVFR, 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 UCD74111RVFR part is unused and in its original packaging.
Return procedure for UCD74111RVFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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