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Texas Instruments UCD7242RSJT
- Part No.:
- UCD7242RSJT
- Manufacturer:
- Texas Instruments
- Package:
- 32-PowerVFQFN
- Datasheet:
-
UCD7242RSJT.pdf
- Description:
- IC REG BUCK 10A DL 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:663
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Product details
Overview
UCD7242RSJT from Texas Instruments is a dual-channel synchronous-buck power driver IC integrating high-side and low-side NMOS power MOSFETs, gate drivers, current sensing, thermal monitoring, and protection circuitry in a single 32-pin QFN package. It delivers up to 10 A per channel, supports 300–2000 kHz switching, operates from 2.2 V to 18 V input, and is designed for digital power systems using TI Fusion controllers (e.g., UCD92xx) in VRM/EVRD applications.
For engineers reviewing the UCD7242RSJT datasheet, UCD7242RSJT pinout, UCD7242RSJT application, or UCD7242RSJT equivalent, key selection considerations include its integrated dual buck stage architecture, ±5% on-die current sensing accuracy, 6.25 V regulated VGG supply, thermal shutdown at 170°C, and compatibility with digital PWM/SRE control interfaces for server, telecom, and high-performance computing power delivery.
Technical Context
The UCD7242RSJT implements two independent synchronous-buck power stages with fully integrated NMOS FETs (15.5 mΩ high-side, 6.5 mΩ low-side), each driven by dedicated gate drivers powered by an internal 6.25 V VGG regulator (UVLO threshold 4.0 V). It accepts digital PWM and SRE inputs to configure continuous or discontinuous conduction mode per channel.
Current sensing uses precision on-die elements delivering 20 µA/A IMON output (±5% accuracy), while die temperature is converted to voltage at TMON (10 mV/°C, 470 mV offset at 0°C) and triggers thermal shutdown at 170°C with 20°C hysteresis. Fault detection includes high-side overcurrent (15 A trip), blanking time (60 ns), and latched FLT flag assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2 V to 18 V - supports wide-input digital power supplies including low-voltage CPU cores and high-voltage intermediate bus architectures |
| Output Current per Channel | Up to 10 A - enables high-density dual-phase VRM designs without external power switches |
| Switching Frequency | 300–2000 kHz - allows optimization of size vs. efficiency across server, telecom, and notebook applications |
| Current Sense Accuracy | ±5% - provides reliable load-current feedback for closed-loop digital power control without external sense resistors |
| Thermal Shutdown Threshold | 170°C - protects against sustained overload or cooling failure while maintaining safe junction operation up to 125°C |
| VGG Supply Voltage | 6.25 V (regulated) - ensures robust NMOS gate drive for fast turn-on/turn-off and low RDS(on) conduction losses |
| Package | 32-pin QFN (6 mm × 6 mm, RSJ code) - enables compact layout with exposed thermal pad for efficient heat dissipation |
Pinout & Package
UCD7242RSJT is housed in a thermally enhanced 32-pin QFN package (Pkg Code: RSJ, 6 mm × 6 mm) with exposed thermal pad. Pin numbering follows top-view layout as defined in TI SLUS962B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM-A / PWM-B | Digital control input | Accepts 3.3 V/5 V logic-level PWM signals up to 2 MHz; controls high-side FET on-time and, when SRE is high, low-side FET conduction |
| SRE-A / SRE-B | Digital mode select input | Enables/disables synchronous rectification: high = CCM, low = DCM at light loads to improve efficiency |
| FLT-A / FLT-B | Fault status output | Open-drain 3.3 V digital flag asserted during overcurrent or thermal fault; latched until next clean PWM cycle |
| IMON-A / IMON-B | Analog current monitor output | 20 µA/A current-source output - converts load current to voltage via external resistor for controller ADC sampling |
| TMON | Temperature sense output | 10 mV/°C analog voltage proportional to die temperature - used for thermal margining and dynamic throttling |
| VIN | Main power input | Supplies internal LDOs and VGG regulator; multiple pins (27,29,30,32) reduce IR drop and improve current sharing |
| PGND | Power ground return | Shared low-impedance return path for both buck stages' high-side and low-side FETs and drivers |
| BST-A / BST-B | Bootstrap capacitor connection | Provides floating gate drive voltage for high-side FETs; requires 0.22 µF ceramic cap to BSW-A/BSW-B |
| SW-A / SW-B | Switching node | Connection point between high-side source and low-side drain; routes square-wave output to buck inductor |
| VGG / VGG_DIS | Gate drive supply control | VGG: 6.25 V regulated output; VGG_DIS: logic input to disable internal regulator for <4.75 V VIN operation |
Key Features
| Feature | Design Value |
|---|---|
| Fully integrated dual buck stage | Eliminates need for 4 discrete MOSFETs, 2 gate drivers, and associated passive components - reduces BOM count and PCB area |
| Accurate on-die current sensing | ±5% gain error over load range enables precise current-mode control and phase balancing in multi-rail systems |
| Dual-mode synchronous rectification | SRE pin selects CCM (full regulation) or DCM (light-load efficiency boost) per channel - improves system efficiency across full load spectrum |
| Integrated thermal protection | On-chip temperature sensor with 170°C shutdown and 20°C hysteresis prevents irreversible silicon damage under sustained overload |
| Robust fault management | High-side overcurrent detection with 60 ns blanking, latched FLT flag, and automatic recovery after fault-free cycle - simplifies controller fault-handling logic |
Applications
| Server VRM Power Delivery | Telecom Base Station DC-DC |
|---|---|
Use Scenario: Dual-phase 1.2 V/10 A CPU core supply in 1U rack server with digital power management. IC Role / Device Role / Timing Role: Dual-channel synchronous-buck power stage driving CPU VDD rail; receives PWM/SRE commands from UCD9222 controller. Use Value: Integrated FETs and ±5% current sensing enable tight load-line regulation and accurate phase current reporting for dynamic voltage/frequency scaling. | Use Scenario: Dual-output 3.3 V/5 V intermediate bus converter in macro-cell base station power shelf. IC Role / Device Role / Timing Role: Independent buck stage per output; supports mixed-frequency operation (e.g., 750 kHz on A, 1 MHz on B) for EMI spreading. Use Value: Wide 2.2–18 V input range accommodates varying upstream bus voltages; thermal shutdown protects against airflow loss in sealed enclosures. |
| Notebook Processor Regulator | Industrial FPGA Core Supply |
Use Scenario: Compact 1.0 V/8 A GPU core supply in ultrabook with strict height and thermal constraints. IC Role / Device Role / Timing Role: Single-channel operation (A or B) with SRE-enabled DCM at idle; TMON monitors die temp for fan speed control. Use Value: 6.25 V VGG drive ensures fast NMOS switching at low duty cycles; 32-pin QFN footprint minimizes board space vs. discrete solutions. | Use Scenario: 1.2 V/10 A FPGA core rail in industrial PLC with extended temperature (-40°C to 125°C) requirement. IC Role / Device Role / Timing Role: Dual-phase interleaved buck stage synchronized to FPGA clock domain; IMON outputs feed real-time current telemetry. Use Value: Guaranteed operation to 125°C junction temperature and ±5% current accuracy support deterministic thermal and power budgeting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous-buck driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQRHBTQ1 | Automotive-grade dual buck controller (no integrated FETs); requires external high-side/low-side MOSFETs and gate drivers | Designed for AEC-Q100 automotive systems; lacks integrated current sensing and thermal monitor outputs | Select when functional safety (ASIL) compliance or >125°C ambient operation is required; not drop-in compatible due to external FET dependency |
| TPS546D24RQFT | Single-channel 60 A PMBus buck converter with integrated FETs; higher current rating but no dual independent channel control | Targeted at high-current single-rail applications (e.g., AI accelerators); lacks separate SRE/PWM per channel and dual FLT/IMON outputs | Choose for simplified single-output designs needing >10 A; not suitable for dual-rail phase control or independent channel monitoring |
Compared with LM5143AQRHBTQ1 and TPS546D24RQFT, the UCD7242RSJT uniquely combines dual independent buck stages with integrated FETs, per-channel current/thermal monitoring, and digital SRE mode control - making it optimal for space-constrained, digitally managed multi-rail systems where component count and signal fidelity are critical.
Availability
UCD7242RSJT is available at Aetrix Electronics and suitable for server VRM, telecom DC-DC, and notebook processor power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UCD7242RSJT 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 UCD7242RSJT belongs to TI's Fusion Digital Power driver family, engineered specifically to complement UCD92xx digital controllers in high-density, digitally programmable multi-phase VRM/EVRD systems for computing and communications infrastructure.
FAQ
What is the maximum switching frequency supported by the UCD7242RSJT?
The UCD7242RSJT supports switching frequencies from 300 kHz up to 2000 kHz, as specified in the recommended operating conditions. This range allows designers to balance efficiency, component size, and EMI performance - for example, 750 kHz enables compact inductor selection while maintaining >90% efficiency at 10 A output. The device's gate drivers and internal timing circuits are characterized to operate reliably across this full band.
Does the UCD7242RSJT require external MOSFETs?
No, the UCD7242RSJT does not require external MOSFETs. It integrates two complete synchronous-buck power stages - each with matched high-side (15.5 mΩ) and low-side (6.5 mΩ) NMOS FETs, gate drivers, bootstrap circuitry, and protection logic - enabling fully self-contained dual-output DC-DC conversion from a single IC.
How does the SRE pin affect operation of the UCD7242RSJT?
The SRE pin on the UCD7242RSJT determines conduction mode per channel: when high, it enables synchronous rectification (CCM) where the low-side FET is actively driven; when low, it forces discontinuous conduction mode (DCM) by holding the low-side FET off, allowing only body-diode conduction at light loads. This improves light-load efficiency without requiring controller firmware changes.
What is the purpose of the IMON pin on the UCD7242RSJT?
The IMON pin on the UCD7242RSJT provides a 20 µA/A current-source output proportional to the channel's output current. When connected to a grounded resistor, it generates a voltage that the host controller (e.g., UCD92xx) can measure for real-time current monitoring, phase balancing, and overcurrent protection - eliminating the need for external sense resistors and associated noise-prone traces.
Can the UCD7242RSJT operate with input voltages below 4.75 V?
Yes, the UCD7242RSJT can operate with input voltages as low as 2.2 V by disabling the internal VGG regulator via the VGG_DIS pin and supplying an external 4.75–6.2 V gate drive voltage to the VGG pin. This capability extends usability to low-input intermediate bus architectures while maintaining full gate drive strength and switching performance.
UCD7242RSJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- -
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 10A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN-HR (6x6)
UCD7242RSJT FAQ
1.How can I place an order for UCD7242RSJT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD7242RSJT 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 UCD7242RSJT reliable?
The price and inventory of UCD7242RSJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD7242RSJT is usually 5 days.
3.What payment methods are accepted for UCD7242RSJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD7242RSJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD7242RSJT?
UCD7242RSJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD7242RSJT 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 UCD7242RSJT?
For technical support, including UCD7242RSJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD7242RSJT requirements.
6.How does Aetrix verify that UCD7242RSJT is sourced from the original manufacturer or authorized distributors?
All UCD7242RSJT 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 UCD7242RSJT meets industry standards.
7.What is the process for return or replacement of UCD7242RSJT?
All UCD7242RSJT units undergo pre-shipment inspection (PSI). If there is an issue with UCD7242RSJT, 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 UCD7242RSJT part is unused and in its original packaging.
Return procedure for UCD7242RSJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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