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Texas Instruments UCC24624DR
- Part No.:
- UCC24624DR
- Manufacturer:
- Texas Instruments
- Category:
- Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC24624DR.pdf
- Description:
- IC GATE DRVR LOW-SIDE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,482
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Product details
Overview
UCC24624 from Texas Instruments is a dual-channel synchronous rectifier (SR) controller optimized for LLC resonant converters, replacing output diodes with N-channel MOSFETs to improve efficiency. It features 23-ns turn-off delay, 230-V VD pin rating, 4.25–26-V VDD operation, proportional gate drive, and two-channel interlock-enabling high-frequency (up to 625 kHz), high-efficiency power supplies in ATX and server applications.
For engineers reviewing the UCC24624 datasheet, UCC24624 pinout, UCC24624 application, or UCC24624 equivalent, this page delivers verified functional identity, validated pin roles, confirmed timing specs (tdVGOFF = 23 ns typ), real-world standby current (180 µA), and precise alternative part guidance for LLC SR design validation and BOM optimization.
Technical Context
The UCC24624 implements drain-to-source voltage (VDS) sensing with dual independent comparators per channel: turn-on at –265 mV and user-adjustable turn-off ≥10.5 mV. Its adaptive blanking (475 ns on-time, 650 ns off-time) suppresses parasitic ringing while supporting >625-kHz switching above resonance.
It integrates a 11-V linear regulator (REG pin), 1.5-A source / 4-A sink gate drivers, automatic standby mode triggered at <9 kHz average frequency, and hardware interlock logic preventing simultaneous conduction of Q1 and Q2-ensuring shoot-through immunity without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VD Pin Rating | 230 V - enables direct sensing on high-voltage secondary-side nodes up to 24.75 V output without external level-shifting. |
| Turn-off Delay | 23 ns typ - ensures fast SR turn-off even at 625-kHz LLC switching, minimizing body diode conduction during high-di/dt transitions. |
| VDD Range | 4.25–26 V - supports wide-output LLC designs; internal 27.5-V clamp allows safe operation up to 36-V output with series resistor. |
| Standby Current | 180 µA - meets CoC Tier 2 and DoE Level VI no-load power requirements in low-power or light-load conditions. |
| Gate Drive Strength | 1.5-A source / 4-A sink - drives large N-channel MOSFETs (e.g., 10–50 nC Qg) with minimal rise/fall time (23/35 ns @ 6.8 nF). |
| Turn-on Threshold | –265 mV typ - detects MOSFET conduction onset early, reducing body diode forward voltage drop and associated loss. |
| Interlock Logic | Hardware-enforced - prevents Q1 and Q2 from conducting simultaneously, eliminating risk of transformer short-circuit in center-tapped secondaries. |
Pinout & Package
UCC24624 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present; thermal performance characterized by RθJA = 108.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VG1 | Channel 1 gate driver output | 1.5-A source / 4-A sink drive for SR MOSFET Q1; requires short PCB trace + small series resistor for optimal EMI and switching. |
| PGND | Power ground return | Common return path for gate driver peak currents and IC bias; must connect directly to SR MOSFET source pins with low-inductance layout. |
| REG | Internal LDO output (11 V) | Stable 11-V bias supply for gate drivers; requires 2.2-µF ceramic capacitor to PGND for regulation stability and noise immunity. |
| VD1 | Channel 1 drain voltage sense input | Senses Q1 VDS; connects directly to Q1 drain-layout must avoid shared routing with power paths to minimize parasitic inductance effects. |
| VSS | Shared source reference node | Common sense reference for both channels; offset current (330 µA typ) enables adjustable turn-off threshold via external resistor. |
| VD2 | Channel 2 drain voltage sense input | Senses Q2 VDS; identical layout constraints as VD1-critical for accurate zero-current detection in asymmetric LLC waveforms. |
| VDD | Input to internal LDO | Accepts 4.25–26 V; clamped at 27.5 V internally-supports >24.75 V outputs when used with external current-limiting resistor. |
| VG2 | Channel 2 gate driver output | Functionally identical to VG1; interlocked with VG1 to prevent shoot-through-no external dead-time circuitry required. |
Key Features
| Feature | Design Value |
|---|---|
| Proportional gate drive | Reduces gate voltage when VDS rises above –35 mV, extending conduction time near zero-current crossing and cutting body diode conduction loss by up to 40% vs fixed-drive SR controllers. |
| Adjustable turn-off threshold | Set via VSS pin current (260–400 µA); compensates for MOSFET package inductance-induced voltage offset, enabling reliable zero-current turn-off across TO-220, SO-8, and SON packages. |
| Adaptive DCM ring rejection | Uses dynamic on-time blanking and comparator hysteresis to ignore false triggers from resonant ringing during discontinuous conduction mode-improving reliability in light-load LLC operation. |
| Automatic standby mode | Enters at <9 kHz average switching frequency; reduces VDD current to 180 µA while holding VG1/VG2 low-eliminates need for external enable/disable circuitry in no-load CoC compliance. |
| Two-channel interlock | Hardware-level mutual exclusion logic ensures only one SR channel is active at any time-even during transient faults-preventing destructive shoot-through in center-tapped or full-wave LLC secondaries. |
Applications
| Desktop & Server PSUs | AC-DC Adapters |
|---|---|
|
Use Scenario: 500–1000 W ATX/SSI EPS power supplies using LLC + PFC topology with dual-phase synchronous rectification on +12 V and +5 V rails. IC Role / Device Role / Timing Role: Dual-channel SR controller managing Q1/Q2 conduction timing based on real-time VDS sensing, synchronized to LLC resonant tank zero-current crossings. Use Value: Enables >96% full-load efficiency and <75 mW no-load consumption-meeting 80 PLUS Titanium and DoE Level VI requirements without auxiliary winding or optocoupler feedback. |
Use Scenario: Universal-input 65–100 W laptop adapters with variable-output LLC architecture delivering 20 V USB-PD and legacy 19.5 V profiles. IC Role / Device Role / Timing Role: Primary SR controller for secondary-side synchronous rectification, interfacing directly with LLC controller (e.g., UCC25630x) via shared VSS and autonomous frequency tracking. Use Value: Reduces secondary-side conduction loss by 30–50% vs Schottky diodes, enabling smaller heatsinks and higher power density in compact adapter form factors. |
| LCD/LED TVs | Industrial DC/DC Converters |
|
Use Scenario: 120–240 W backlight and main-board power supplies in 4K/8K LCD panels, operating at 300–500 kHz with tight thermal constraints. IC Role / Device Role / Timing Role: Dual-channel SR controller driving parallel MOSFETs per rail (e.g., +24 V backlight, +12 V logic), leveraging interlock and proportional drive for stable light-load regulation. Use Value: Eliminates thermal hotspots from diode conduction loss, allowing passive cooling and extending panel lifetime under continuous operation. |
Use Scenario: Isolated 48 V–12 V/5 V DC/DC modules in industrial PLCs and motor drives, requiring high reliability, wide temperature range (–40°C to +125°C), and low EMI. IC Role / Device Role / Timing Role: Synchronous rectifier supervisor for center-tapped secondary windings, using VD1/VD2 sensing and hardware interlock to ensure fault-tolerant operation under load transients. Use Value: Achieves <95% efficiency at 50% load and maintains stable regulation across –40°C to +125°C junction temperature-validated per AEC-Q200 stress test conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous rectifier control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC24612DR | Single-channel SR controller; identical VD rating (230 V), turn-off delay (23 ns), and REG LDO-but lacks dual-channel interlock and proportional gate drive. | Requires two UCC24612DRs for dual-rail designs, increasing BOM count, layout area, and timing skew risk between channels. | Select UCC24612DR only for cost-sensitive single-output LLC designs where interlock and proportional drive are non-critical. |
| NCP4306ADR2G | Dual-channel SR controller with 200-V VD rating, 40-ns turn-off delay, and fixed 12-V gate drive-no proportional drive or adjustable turn-off threshold. | Less effective at mitigating body diode conduction in high-di/dt LLC operation above resonance; limited to ≤20 V output without external level shift. | Choose NCP4306ADR2G for lower-cost 12–20 V output adapters where 625-kHz operation and sub-100 mV turn-off adjustment are not required. |
Compared with UCC24624, UCC24612DR increases component count and timing complexity in dual-rail systems, while NCP4306ADR2G sacrifices precision zero-current detection and high-voltage robustness-making UCC24624 the only option supporting 24.75 V+ outputs, 625-kHz switching, and adaptive body diode minimization in a single SOIC-8 package.
Availability
UCC24624 is available at Aetrix Electronics and suitable for desktop PC power supplies, AC-DC adapters, and industrial isolated DC/DC converters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for UCC24624 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 ICs, with over 50 years of innovation in high-efficiency power conversion solutions.
The UCC24624 belongs to TI's synchronous rectifier controller product line, engineered specifically for high-frequency LLC resonant converters to replace lossy diodes and achieve >96% system efficiency across full-load to no-load conditions.
FAQ
What is the maximum LLC switching frequency supported by the UCC24624?
The UCC24624 supports LLC resonant converters operating up to 625 kHz, enabled by its 23-ns typical turn-off propagation delay and 475-ns minimum on-time blanking. This specification is validated across –40°C to +125°C junction temperature and ensures reliable SR MOSFET control even when the converter operates above resonant frequency-critical for high-density, high-efficiency power supplies using the UCC24624.
How does the UCC24624 implement proportional gate drive, and what benefit does it provide?
The UCC24624 reduces gate drive voltage when the SR MOSFET's VDS rises above –35 mV, extending conduction time near zero-current crossing. This proportional action cuts body diode conduction loss by up to 40% compared to fixed-voltage gate drivers-directly improving light-load efficiency and thermal performance in LLC designs using the UCC24624.
Can the UCC24624 be powered directly from a 36-V LLC output?
Yes-the UCC24624 includes an internal 27.5-V VDD clamp. When powered from a 36-V output, a series current-limiting resistor (≥750 Ω) is added between the output and VDD to keep clamp current below 15 mA. The REG pin still delivers stable 11-V gate drive, ensuring reliable operation of the UCC24624 without external regulators or LDOs.
What is the purpose of the VSS pin on the UCC24624, and how is it used?
The VSS pin serves as the common source reference for both VD1 and VD2 sensing inputs. Its 330-µA typical offset current allows adjustment of the SR turn-off threshold via an external resistor-compensating for MOSFET package inductance-induced voltage errors. Correct VSS layout (short, dedicated trace to MOSFET sources) is essential for accurate zero-current detection in the UCC24624.
Does the UCC24624 require external components to enter standby mode?
No-the UCC24624 features fully autonomous standby mode detection based on average switching frequency. When frequency drops below 9 kHz, it automatically disables gate outputs and reduces VDD current to 180 µA-requiring no external circuitry, timers, or control signals. This built-in function ensures seamless compliance with CoC and DoE Level VI no-load regulations using only the UCC24624.
UCC24624DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Low-Side
- Channel Type:
- Independent
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 4.25V ~ 26V
- Logic Voltage - VIL, VIH:
- -
- Current - Peak Output (Source, Sink):
- 1.5A, 4A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- 23ns, 19ns
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC24624DR FAQ
1.How can I place an order for UCC24624DR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC24624DR 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 UCC24624DR reliable?
The price and inventory of UCC24624DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC24624DR is usually 5 days.
3.What payment methods are accepted for UCC24624DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC24624DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC24624DR?
UCC24624DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC24624DR 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 UCC24624DR?
For technical support, including UCC24624DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC24624DR requirements.
6.How does Aetrix verify that UCC24624DR is sourced from the original manufacturer or authorized distributors?
All UCC24624DR 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 UCC24624DR meets industry standards.
7.What is the process for return or replacement of UCC24624DR?
All UCC24624DR units undergo pre-shipment inspection (PSI). If there is an issue with UCC24624DR, 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 UCC24624DR part is unused and in its original packaging.
Return procedure for UCC24624DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC24624DR Tags
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ZXGD3009E6TA
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UCC27517DBVR
Texas Instruments
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IRS2005STRPBF
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2EDN7524RXTMA1
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