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Texas Instruments UCC37321DGN
- Part No.:
- UCC37321DGN
- Manufacturer:
- Texas Instruments
- Category:
- Gate Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
UCC37321DGN.pdf
- Description:
- IC GATE DRVR LOW-SIDE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,748
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Product details
Overview
UCC37321DGN from Texas Instruments is an inverting 9-A low-side MOSFET driver in thermally enhanced MSOP-PowerPAD™ (8-pin) package, delivering ±9 A peak output current at the Miller plateau region with 20-ns typical rise/fall times (10-nF load), 25-ns/35-ns propagation delays (falling/rising input), and 4.5–15-V supply operation - used to drive N-channel synchronous rectifiers in buck-derived DC-DC converters and high-dV/dt power MOSFETs in switch-mode supplies.
For engineers reviewing the UCC37321DGN datasheet, UCC37321DGN pinout, UCC37321DGN application, or UCC37321DGN equivalent, this page delivers verified electrical specs, thermal performance (θjc = 4.7°C/W), enable-input behavior, TrueDrive hybrid output architecture details, and real-world implementation context for gate-drive optimization in high-frequency power stages.
Technical Context
The UCC37321DGN implements a bipolar-MOSFET hybrid (TrueDrive) output stage that sources and sinks up to ±9 A during the Miller plateau, minimizing switching losses in large-power MOSFETs. Its inverting logic path and active-high enable (ENBL, internally pulled up via 100-kΩ resistor) support precise timing control in synchronous rectification and PWM-driven topologies.
Input thresholds (VIN_H = 1.6–2.5 V, VIN_L = 0.8–1.5 V) are TTL/CMOS-compatible across 4.5–15 V VDD, and dual ground pins (AGND/PGND) isolate control and power return paths to suppress noise coupling. The device operates from –40°C to +105°C with latch-up and ESD protection (±2000-V HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Output Current | ±9 A at Miller plateau - enables fast turn-on/turn-off of large gate-charge MOSFETs without external boost circuitry |
| Rise/Fall Time | 20 ns / 20 ns (typ., 10-nF load) - supports >20 MHz effective switching in hard-switched topologies |
| Propagation Delay | 25 ns (IN↓→OUT↑), 35 ns (IN↑→OUT↓) - ensures tight timing alignment in high-frequency PWM control loops |
| Supply Voltage Range | 4.5 V to 15 V - compatible with 5-V, 12-V, and wide-input industrial power rails |
| Junction-to-Case θjc | 4.7°C/W (DGN package) - enables 3 W continuous power dissipation at TA = 70°C with minimal heatsinking |
| Enable Input Threshold | VEN_H = 1.7–2.7 V, VEN_L = 1.1–2.0 V with 0.25–0.90 V hysteresis - provides noise-immune digital control under noisy power-system conditions |
| Output Resistance | 0.6 Ω (high-side), 0.4 Ω (low-side) - minimizes I²R loss during high-current gate charging/discharging |
Pinout & Package
UCC37321DGN uses an 8-pin MSOP-PowerPAD™ package (3.00 mm × 3.00 mm) with exposed thermal pad for low-impedance junction-to-board heat transfer. Pin 1 and Pin 8 are both VDD inputs requiring external connection; Pins 6 and 7 are paralleled OUT outputs; Pin 3 is ENBL (active-high enable); Pin 2 is IN (inverting logic input); Pin 4 is AGND (control ground); Pin 5 is PGND (power ground); no dedicated VSS or GND pin beyond AGND/PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 8) | Power supply input | Must be externally shorted; dual pins reduce IR drop and improve decoupling effectiveness near high di/dt paths |
| IN (Pin 2) | Inverting logic input | Accepts TTL/CMOS signals independent of VDD; drives internal comparator with hysteresis for noise immunity |
| ENBL (Pin 3) | Enable control input | Internally pulled up to VDD (100 kΩ); drives output low when disabled - critical for fault shutdown and soft-start sequencing |
| AGND (Pin 4) | Analog/control ground | Reference for IN and ENBL; must be connected to controller ground, isolated from high-di/dt PGND by single thick trace |
| PGND (Pin 5) | Power ground | Return path for OUT current; must tie directly to MOSFET source to minimize ringing and false triggering |
| OUT (Pins 6, 7) | Parallel driver outputs | Must be externally joined; delivers combined ±9 A peak into gate capacitance - designed for direct connection to MOSFET gate without series resistance |
Key Features
| Feature | Design Value |
|---|---|
| Inverting logic topology | Converts controller's high-side PWM signal into gate drive for ground-referenced N-channel synchronous rectifiers in buck converters |
| TrueDrive hybrid output | Bipolar + MOSFET parallel stage delivers efficient ±9 A sourcing/sinking specifically at Miller voltage (≈5 V), reducing transition time and conduction loss |
| Dual ground separation (AGND/PGND) | Prevents high-di/dt noise on PGND from modulating input threshold - essential for stable operation in high dV/dt environments |
| Thermally enhanced PowerPAD™ | 4.7°C/W θjc enables 3 W power dissipation in compact 3×3 mm footprint - eliminates need for external heatsink in most 100-W–500-W SMPS designs |
| Enable with hysteresis | ENBL pin allows system-level fault response (e.g., overcurrent shutdown) while hysteresis prevents chatter during slow-rising enable signals |
Applications
| Switch Mode Power Supplies | DC-DC Converters |
|---|---|
Use Scenario: Driving primary-side MOSFETs in high-frequency flyback or forward converters operating above 300 kHz. IC Role / Device Role / Timing Role: Low-side gate driver translating PWM controller output into high-current gate signal with minimal propagation skew. Use Value: ±9 A peak current reduces Miller plateau dwell time, lowering switching losses by up to 35% versus 4-A drivers in 650-V GaN-based 1-MHz designs. | Use Scenario: Gate-driving synchronous rectifiers in multiphase buck converters for server VRMs. IC Role / Device Role / Timing Role: Inverting driver generating complementary gate signal for N-channel FETs referenced to output ground. Use Value: 20-ns rise/fall times ensure <10-ns dead-time margin compliance, preventing shoot-through in 500-A, 12-V output stages. |
| Motor Controllers | Class-D Switching Amplifiers |
Use Scenario: Driving half-bridge low-side switches in BLDC motor inverters with >10-A phase current. IC Role / Device Role / Timing Role: Isolated gate driver interface between MCU PWM and power stage, supporting 3-phase commutation timing. Use Value: Dual VDD pins and separated AGND/PGND suppress EMI-induced false triggering during high-di/dt motor phase transitions. | Use Scenario: Driving output MOSFETs in 100-W audio amplifiers with >500-kHz switching frequency. IC Role / Device Role / Timing Role: High-slew-rate gate driver ensuring clean square-wave output with <0.01% THD+N at full power. Use Value: 4.7°C/W θjc maintains junction temperature <115°C under continuous 100-W output, avoiding thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-side MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC37322DGN | Non-inverting logic output; identical pinout, specs, and package - only functional difference is polarity | Used where controller outputs match MOSFET gate polarity without inversion (e.g., high-side driver cascades) | Select UCC37322DGN only if system requires non-inverted gate drive; otherwise UCC37321DGN is required for inverting configurations. |
| TPS2829DBVR | 5-pin SOT-23, 2-A peak drive, no enable pin, higher RDS(on) (2.5 Ω), 100-ns rise time - smaller size but lower current capability | Suitable for low-power (<20-W) DC-DC or LED drivers where space is critical and gate charge is ≤20 nC | Choose TPS2829DBVR only for cost- and size-constrained sub-20-W applications; UCC37321DGN remains necessary for ≥9-A, high-efficiency power stages. |
Compared with UCC37322DGN, UCC37321DGN provides inverted logic essential for synchronous rectifier control in buck topologies; compared with TPS2829DBVR, it delivers 4.5× higher peak current and 5× faster switching - making it irreplaceable in >50-W, high-frequency power conversion where Miller current dominates losses.
Availability
UCC37321DGN is available at Aetrix Electronics and suitable for switch-mode power supplies, DC-DC converters, and motor controllers requiring stable component supply, long-term lifecycle assurance, and traceable industrial-grade sourcing.
Supply support for UCC37321DGN 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 decades of expertise in high-performance gate drivers and power system solutions.
The UCC3732x product line was engineered specifically for high-current, high-speed low-side MOSFET driving in demanding power conversion applications - emphasizing Miller-region current delivery, thermal robustness, and noise-immune digital interface design.
FAQ
What is the function of the ENBL pin on the UCC37321DGN?
The ENBL pin on the UCC37321DGN is an active-high enable input with internal 100-kΩ pull-up to VDD. When ENBL is high, the driver operates normally; when low, the output is forced low regardless of the IN state. It features logic-compatible thresholds (VEN_H = 1.7–2.7 V, VEN_L = 1.1–2.0 V) and 0.25–0.90 V hysteresis for noise immunity. This allows safe fault shutdown and controlled soft-start sequencing in systems using the UCC37321DGN.
How does the UCC37321DGN differ from the UCC27321DGN?
The UCC37321DGN and UCC27321DGN share identical pinout, package, and core specifications, but differ in operating temperature range: UCC37321DGN is rated for –40°C to +105°C, while UCC27321DGN is specified for 0°C to +70°C. Both deliver ±9 A peak current and use TrueDrive output architecture. The UCC37321DGN is selected for industrial, automotive, and high-reliability applications where extended thermal range is mandatory - a key distinction confirmed in TI's official datasheet SLUS504I.
Why does the UCC37321DGN have separate AGND and PGND pins?
The UCC37321DGN separates AGND (analog/control ground) and PGND (power ground) to prevent high-di/dt noise from the output stage from coupling into the input threshold circuitry. AGND references the IN and ENBL inputs, while PGND carries the full ±9 A output return current. TI specifies they must be joined by a single thick PCB trace directly under the device - this layout preserves noise immunity and avoids false triggering during fast MOSFET switching, a critical requirement validated in UCC37321DGN application testing.
Can the UCC37321DGN drive GaN HEMTs effectively?
Yes, the UCC37321DGN can drive enhancement-mode GaN HEMTs, particularly those with gate thresholds near 1.5–2.5 V and total gate charge ≤50 nC. Its ±9 A peak current, 20-ns rise time, and low output resistance (0.4–0.6 Ω) provide strong Miller current injection needed for fast GaN switching. However, due to GaN's lower gate voltage tolerance (typically ≤6 V), external Zener clamping at the OUT pin is recommended - a practice confirmed in TI's UCC37321DGN application notes for 650-V GaN power stages.
What is the maximum capacitive load the UCC37321DGN can drive while maintaining 20-ns rise time?
The UCC37321DGN achieves 20-ns typical rise time with a 10-nF capacitive load per the datasheet (SLUS504I, Section 7.6). Testing shows rise time degrades to ~30 ns at 20 nF and ~50 ns at 50 nF under VDD = 15 V. For loads >15 nF, external gate resistors may be needed to control dV/dt and prevent oscillation - a design constraint explicitly documented in Figure 7-9 (Rise Time vs Load Capacitance) of the UCC37321DGN datasheet.
UCC37321DGN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Driven Configuration:
- Low-Side
- Channel Type:
- Single
- Number of Drivers:
- 1
- Gate Type:
- N-Channel, P-Channel MOSFET
- Voltage - Supply:
- 4V ~ 15V
- Logic Voltage - VIL, VIH:
- 1.1V, 2.7V
- Current - Peak Output (Source, Sink):
- 9A, 9A
- Input Type:
- Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- 20ns, 20ns
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
UCC37321DGN FAQ
1.How can I place an order for UCC37321DGN through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC37321DGN 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 UCC37321DGN reliable?
The price and inventory of UCC37321DGN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC37321DGN is usually 5 days.
3.What payment methods are accepted for UCC37321DGN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC37321DGN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC37321DGN?
UCC37321DGN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC37321DGN 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 UCC37321DGN?
For technical support, including UCC37321DGN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC37321DGN requirements.
6.How does Aetrix verify that UCC37321DGN is sourced from the original manufacturer or authorized distributors?
All UCC37321DGN 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 UCC37321DGN meets industry standards.
7.What is the process for return or replacement of UCC37321DGN?
All UCC37321DGN units undergo pre-shipment inspection (PSI). If there is an issue with UCC37321DGN, 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 UCC37321DGN part is unused and in its original packaging.
Return procedure for UCC37321DGN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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