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Texas Instruments UC3705NG4
- Part No.:
- UC3705NG4
- Manufacturer:
- Texas Instruments
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3705NG4.pdf
- Description:
- BUFFER/INVERTER BASED MOSFET DRI
- Quantity:
- Payment:
- Shipping:
Inventory:451
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Product details
Overview
UC3705NG4 from Texas Instruments is a high-speed dual-input power driver IC designed to interface low-level logic with high-power MOSFETs in switching power stages. It delivers ±1.5 A peak source/sink current, operates from 5 V to 40 V supply rails (VS and VC independently), and achieves 100 ns propagation delay with 40 ns rise/fall times into 1000 pF - enabling use in high-frequency DC-DC converters and motor gate drive circuits.
For engineers reviewing the UC3705NG4 datasheet, UC3705NG4 pinout, UC3705NG4 application, or UC3705NG4 equivalent, key selection criteria include its dual inverting/non-inverting inputs, thermal shutdown protection, low cross-conduction current spike, and compatibility with 0°C to 70°C industrial ambient operation in PDIP-8 packaging.
Technical Context
The UC3705NG4 integrates complementary Schottky bipolar output stages optimized for fast capacitive loading, supporting bidirectional 1.5 A transient current delivery without external boost components. Its dual-input architecture allows logic-level gating of either polarity, enabling flexible PWM control or strobe-based enable schemes in half-bridge drivers.
Independent VS (power switch supply) and VC (logic/control supply) rails permit level-shifting between 5 V logic and up to 40 V power domains. Internal thermal shutdown activates at 155°C, and quiescent supply current remains below 12 mA at 40 V - critical for efficiency-sensitive offline and isolated converter topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Output Current | ±1.5 A - drives power MOSFET gates with minimal external buffering in <100 kHz switching applications |
| Supply Voltage Range | 5 V to 40 V (VS and VC independent) - supports direct connection to buck/boost power rails without LDO pre-regulation |
| Propagation Delay | 100 ns - enables precise timing alignment in synchronous rectifier and phase-shifted full-bridge controllers |
| Rise/Fall Time | 40 ns into 1000 pF - ensures fast MOSFET turn-on/off with low switching loss in high-efficiency SMPS designs |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial power supplies and motor control modules |
| Input Logic Compatibility | CMOS/TTL - accepts standard 3.3 V or 5 V logic signals without level translation circuitry |
| Thermal Shutdown Threshold | 155°C - protects against latch-up during overload or heatsink failure in enclosed power assemblies |
Pinout & Package
UC3705NG4 is supplied in an 8-pin plastic dual in-line package (PDIP-8, package code P), with 0.3 inch body width and 0.1 inch lead pitch. The package is RoHS-compliant, lead-finished with NiPdAu, and rated for reflow per JEDEC Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N.I. IN) | Non-Inverting Input | Active-high logic input; output follows this signal when INV is high (truth table row 2) |
| 2 (INV. IN) | Inverting Input | Active-high logic input; output is inverted relative to N.I. IN when this pin is high (truth table row 1) |
| 3 (GND) | Logic Ground Reference | Return path for input logic and internal biasing; must be tied to system logic ground plane |
| 4 (OUT) | Power Output Terminal | High-current push-pull output capable of sourcing/sinking up to 1.5 A; connects directly to MOSFET gate |
| 5 (VC) | Control Supply Rail | Provides operating voltage for input logic and driver stage bias; independent of VS rail |
| 6 (VS) | Power Switch Supply Rail | Supplies output stage high-side and low-side transistors; decoupling required near pin |
| 7 (GND) | Power Ground Return | Separate return path for output stage current; should be star-connected to minimize ground bounce |
| 8 (NC) | No Connect | Internally unconnected; must remain floating - no external tie or trace routing |
Key Features
| Feature | Design Value |
|---|---|
| Dual logic inputs (inverting + non-inverting) | Enables flexible control architectures - e.g., PWM gating via INV while N.I. carries duty cycle, or OR-ed enable logic |
| Low cross-conduction current spike | Minimizes shoot-through risk during MOSFET transition in half-bridge configurations without external dead-time circuitry |
| Thermal shutdown protection | Self-protects under sustained overcurrent or poor heatsinking; auto-recovery on cooldown avoids system lockup |
| 1.5 A source/sink capability | Drives large gate capacitances (e.g., >5 nF) at high frequency without external buffer transistors |
| Wide 5–40 V dual-rail operation | Eliminates need for auxiliary bias supplies in systems where main rail powers both logic and power stages |
Applications
| Switch-Mode Power Supply Gate Drive | DC Motor H-Bridge Control |
|---|---|
|
Use Scenario: Driving high-side and low-side N-channel MOSFETs in synchronous buck converters operating at 50–200 kHz. IC Role / Device Role / Timing Role: High-speed gate driver translating PWM controller outputs into robust gate voltage swings with matched rise/fall characteristics. Use Value: Reduces MOSFET switching losses by delivering 1.5 A peak current to charge/discharge gate capacitance within 40 ns, improving overall converter efficiency by ≥1.2% at 12 V input. |
Use Scenario: Controlling bidirectional current flow in brushed DC motors used in industrial actuators and HVAC dampers. IC Role / Device Role / Timing Role: Dual-input driver enabling direction reversal via logic-selectable inverting/non-inverting paths while maintaining precise PWM duty control. Use Value: Eliminates need for discrete level shifters or dual-driver ICs - single UC3705NG4 supports full H-bridge logic with only two control lines and shared power rail. |
| Capacitive Line Driver | Isolated Flyback Controller Interface |
|
Use Scenario: Driving long PCB traces or cables acting as capacitive loads in test equipment and programmable power supplies. IC Role / Device Role / Timing Role: High-current line driver providing fast edge rates into distributed capacitance (>1 nF) without signal degradation. Use Value: Maintains clean 100 MHz-equivalent edge fidelity (40 ns rise time) across 1000 pF loads - enabling reliable digital signaling over 15 cm FR-4 traces. |
Use Scenario: Interfacing optocoupler-isolated feedback signals to primary-side PWM controllers in offline flyback adapters. IC Role / Device Role / Timing Role: Level-shifting and amplifying isolated error amplifier output to drive power MOSFET gate with precise timing alignment. Use Value: Independent VS/VC rails allow direct connection to 30 V primary rail (VS) while accepting 5 V opto-output (VC), reducing component count vs. discrete level shifter solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed power driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3705D | SOIC-8 package (vs. PDIP-8); same electrical specs, 0°C to 70°C rating, RoHS-compliant NiPdAu finish | Better suited for automated SMT assembly and space-constrained layouts; requires reflow-compatible PCB design | Select UC3705D for surface-mount production; UC3705NG4 remains optimal for through-hole prototyping or legacy board upgrades. |
| UCC37322P | Single-output, 4-A peak driver; 12 ns typical delay; 5 V to 15 V operation only; no dual-input logic flexibility | Limited to low-voltage (<15 V) gate drive; lacks independent VS/VC rails and thermal shutdown | Choose UCC37322P only for ultra-fast, single-channel, low-voltage applications where UC3705NG4's dual-input and wide voltage range are unnecessary. |
Compared with UC3705D and UCC37322P, UC3705NG4 uniquely combines through-hole manufacturability, 5–40 V dual-rail operation, dual logic inputs, and integrated thermal protection - making it the preferred choice for ruggedized industrial power modules requiring field-serviceable assembly and wide input adaptability.
Availability
UC3705NG4 is available at Aetrix Electronics and suitable for switch-mode power supply gate drive, DC motor H-bridge control, and capacitive line driver applications requiring stable component supply across extended product lifecycles.
Supply support for UC3705NG4 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 heritage in high-reliability industrial and automotive ICs.
The UC3705NG4 belongs to TI's legacy high-speed power driver family, engineered specifically for robust gate driving in industrial power conversion, motor control, and line-driving applications where wide supply range and thermal resilience are critical.
FAQ
What is the maximum continuous output current rating for UC3705NG4?
The UC3705NG4 is rated for ±500 mA steady-state output current per the Absolute Maximum Ratings table. Its ±1.5 A rating applies only to peak transient conditions (e.g., gate charging pulses). Continuous operation above ±500 mA risks thermal overload unless heatsinking and PCB copper area meet TI's recommended layout guidelines for the PDIP-8 package.
Does UC3705NG4 support independent logic and power supply rails?
Yes, UC3705NG4 features separate VC (control supply) and VS (power supply) pins, each configurable from 5 V to 40 V. This allows the logic inputs to operate from a 5 V microcontroller rail (VC) while the output stage switches a 24 V or 40 V MOSFET drain (VS), eliminating level-shifter components in mixed-voltage systems.
Can UC3705NG4 drive both N-channel and P-channel MOSFETs?
UC3705NG4 is optimized for N-channel MOSFET gate drive due to its push-pull output topology and high-side sourcing capability. While it can sink current for P-channel high-side drivers, it lacks bootstrap or charge-pump circuitry needed for efficient high-side N-MOSFET drive - use dedicated high-side drivers like UCC3732x for that topology.
What is the function of Pin 8 (NC) on UC3705NG4?
Pin 8 on UC3705NG4 is designated No Connect (NC) and is internally unconnected. It must remain electrically floating - do not tie to GND, VS, or any other node. Routing traces or vias to Pin 8 may introduce parasitic coupling or violate TI's validated package layout, potentially degrading noise immunity or thermal performance.
How does thermal shutdown behave in UC3705NG4 during overload?
UC3705NG4 activates thermal shutdown at 155°C junction temperature, disabling the output stage until junction temperature falls below the hysteresis threshold (~140°C). During shutdown, input logic remains active but OUT is forced high-impedance. This behavior prevents destructive latch-up and allows safe recovery without external reset circuitry - a key reliability feature in unattended industrial power systems.
UC3705NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Low-Side
- Channel Type:
- Single
- Number of Drivers:
- 1
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 5V ~ 40V
- Logic Voltage - VIL, VIH:
- 0.8V, 2.2V
- Current - Peak Output (Source, Sink):
- 1.5A, 1.5A
- Input Type:
- Inverting, Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- 60ns, 60ns
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
UC3705NG4 FAQ
1.How can I place an order for UC3705NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3705NG4 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 UC3705NG4 reliable?
The price and inventory of UC3705NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3705NG4 is usually 5 days.
3.What payment methods are accepted for UC3705NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3705NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3705NG4?
UC3705NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3705NG4 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 UC3705NG4?
For technical support, including UC3705NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3705NG4 requirements.
6.How does Aetrix verify that UC3705NG4 is sourced from the original manufacturer or authorized distributors?
All UC3705NG4 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 UC3705NG4 meets industry standards.
7.What is the process for return or replacement of UC3705NG4?
All UC3705NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3705NG4, 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 UC3705NG4 part is unused and in its original packaging.
Return procedure for UC3705NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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