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Texas Instruments UC3705DTR
- Part No.:
- UC3705DTR
- Manufacturer:
- Texas Instruments
- Category:
- Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UC3705DTR.pdf
- Description:
- IC GATE DRVR LOW-SIDE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,431
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Product details
Overview
UC3705DTR from Texas Instruments is a high-speed dual-input power driver IC designed to interface low-level logic with power MOSFETs in switching applications. It delivers ±1.5 A peak source/sink drive, operates from 5 V to 40 V supply range, features 100 ns propagation delay, and supports both inverting and non-inverting inputs for flexible logic-level acceptance in motor gate drivers and DC-DC converters.
For engineers reviewing the UC3705DTR datasheet, UC3705DTR pinout, UC3705DTR application, or UC3705DTR equivalent, this device is selected for high-current gate driving where fast rise/fall times (40 ns into 1000 pF), thermal shutdown protection, and low cross-conduction current are critical in industrial power supplies and half-bridge configurations.
Technical Context
The UC3705DTR uses a high-speed Schottky bipolar process to achieve sub-100 ns delays and robust output drive capability. Its dual-input architecture allows independent control of inverting (INV) and non-inverting (N.I.) inputs, enabling logic gating, strobing, or polarity selection without external logic.
It features separate VS (power output supply) and VC (logic supply) rails, each independently configurable from 5 V to 40 V. Thermal shutdown activates at 155°C, and output saturation voltages remain ≤2.5 V at ±500 mA load - critical for minimizing conduction losses in high-frequency switching stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Drive | ±1.5 A peak source/sink - sufficient to rapidly charge/discharge large MOSFET gates in <100 ns |
| Supply Range | 5 V to 40 V on both VS and VC - enables direct use with 12 V/24 V industrial rails and 5 V logic |
| Propagation Delay | 100 ns max - ensures tight timing control in PWM-driven half-bridge and synchronous rectifier circuits |
| Rise/Fall Time | 40 ns into 1000 pF - minimizes switching transition losses and EMI generation |
| Input Logic Compatibility | CMOS/TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.2 V) - interoperable with microcontrollers and PWM controllers |
| Thermal Shutdown | 155°C activation - protects against latch-up or thermal runaway during overload or poor heatsinking |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial control and power conversion environments |
Pinout & Package
UC3705DTR is housed in an 8-pin SOIC (D) package (JEDEC MS-012AA), 3.9 mm wide, 4.9 mm long, 1.75 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-2 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INV) | Inverting input | Active-high logic input that inverts output state - used for complementary drive or enable inversion |
| 2 (N.I.) | Non-inverting input | Active-high logic input that directly controls output state - accepts standard PWM or gate signals |
| 3 (GND) | Logic ground reference | Common return for VC supply and input logic - must be low-impedance to minimize noise coupling |
| 4 (OUT) | Power output terminal | Push-pull output capable of ±1.5 A - drives MOSFET gate directly without external buffer stage |
| 5 (VS) | Power output supply | High-side supply rail for output stage - decoupled separately from VC to prevent supply rail coupling |
| 6 (VC) | Logic supply voltage | Independent bias for internal logic - allows level-shifting between 5 V control and 40 V power domains |
| 7 (NC) | No connect | Internally unused - must remain unconnected per TI design guidelines to avoid parasitic coupling |
| 8 (GND) | Power ground | Return path for output current - requires dedicated low-inductance trace to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Dual logic inputs (INV/N.I.) | Enables gated drive, polarity selection, or logic OR/AND functionality without external gates |
| Low cross-conduction current spike | ≤25 ns duration during output transitions - reduces shoot-through risk in bridge topologies |
| Separate VS and VC supplies | Allows independent optimization of logic integrity (VC) and power efficiency (VS) in mixed-voltage systems |
| Thermal shutdown protection | Auto-recovery after cooldown - prevents permanent damage during transient overloads or layout thermal bottlenecks |
| High-speed Schottky process | Delivers consistent 100 ns delay across full temperature and supply range - no timing drift in production environments |
Applications
| Motor Gate Driver | DC-DC Synchronous Rectifier |
|---|---|
Use Scenario: Driving high-side and low-side N-channel MOSFETs in BLDC motor inverters with 20–100 kHz PWM. IC Role / Device Role / Timing Role: High-current gate driver providing fast, matched turn-on/turn-off to minimize dead-time losses and prevent shoot-through. Use Value: ±1.5 A drive strength and 40 ns rise/fall ensure <100 ns effective dead time, improving inverter efficiency by >2% at 48 V/20 A loads. |
Use Scenario: Replacing Schottky diodes in isolated flyback or forward converters operating up to 500 kHz. IC Role / Device Role / Timing Role: Low-latency gate driver synchronizing MOSFET conduction precisely with primary-side switching edge. Use Value: 100 ns propagation delay and thermal shutdown allow reliable operation under dynamic load transients without external protection circuitry. |
| Industrial Power Supply Control | Capacitive Line Driver |
Use Scenario: Controlling power MOSFETs in programmable lab power supplies requiring precise voltage/current regulation. IC Role / Device Role / Timing Role: Interface between DAC-controlled PWM generator and power stage - maintains signal fidelity across 0–30 V output range. Use Value: 5–40 V dual-supply operation eliminates need for level shifters, reducing BOM count and PCB area by one active component. |
Use Scenario: Driving capacitive loads such as piezoelectric actuators or RF matching networks requiring bidirectional current pulses. IC Role / Device Role / Timing Role: Bidirectional current source/sink delivering controlled ±1.5 A pulses with nanosecond edge control. Use Value: Low quiescent current (<12 mA) and thermal shutdown enable safe repetitive pulsing without heat sink, reducing system size and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC2705D | Same pinout and electrical specs, but rated for –40°C to +85°C industrial temp range vs. UC3705DTR's 0°C to +70°C | Preferred for extended-temperature industrial equipment; not qualified for commercial-only designs with tighter thermal margins | Select UC2705D when ambient exceeds 70°C or when wider temp qualification is required for field reliability |
| UCC37322DR | Higher 4-A peak drive, 35 ns rise time, but single-input only and no thermal shutdown; SOIC-8 package | Suitable for ultra-fast, high-current gate drive where thermal protection is handled externally or via system-level monitoring | Choose UCC37322DR only when >2 A drive is mandatory and thermal safety is implemented at board/system level |
Compared with UC3705DTR, UC2705D extends operational temperature range without altering drive capability or pin compatibility, while UCC37322DR trades built-in protection for higher speed and current - making UC3705DTR optimal for cost-sensitive, thermally constrained commercial power systems requiring integrated safety.
Availability
UC3705DTR is available at Aetrix Electronics and suitable for motor gate drivers, DC-DC synchronous rectifiers, and industrial power supply control requiring stable component supply, tape-and-reel packaging for automated assembly, and long-term lifecycle support.
Supply support for UC3705DTR 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 UC3705DTR belongs to TI's legacy high-speed power driver family, engineered specifically for robust MOSFET gate interfacing in commercial-grade power conversion and motor control systems.
FAQ
What is the maximum continuous output current rating for UC3705DTR?
The UC3705DTR is rated for ±500 mA steady-state output current per its absolute maximum ratings. While it can deliver ±1.5 A peak transient current, sustained operation above ±500 mA requires careful thermal design and derating per the SOIC-8 package's 1 W power dissipation limit at 25°C ambient. Always verify junction temperature using θJA = 120°C/W in actual layout conditions.
Does UC3705DTR support independent voltage rails for logic and power sections?
Yes, UC3705DTR supports fully independent VS (power output supply) and VC (logic supply) rails, each configurable from 5 V to 40 V. This separation allows clean logic-level interfacing (e.g., 5 V MCU) while driving high-voltage MOSFETs (e.g., 36 V bus), eliminating level-shifters and reducing noise coupling between control and power domains in the UC3705DTR design.
Can UC3705DTR drive both N-channel and P-channel MOSFETs directly?
UC3705DTR is optimized for N-channel MOSFET gate driving due to its push-pull output stage and high-side referenced OUT pin. While it can sink current for P-channel high-side switches, it lacks a true high-side floating supply - so direct high-side P-channel drive requires external bootstrap or isolated bias. The UC3705DTR datasheet confirms use cases exclusively with N-channel devices in standard configurations.
What is the purpose of Pin 7 (NC) on UC3705DTR, and can it be grounded?
Pin 7 on UC3705DTR is designated No Connect (NC) and is internally unused. TI's datasheet explicitly states it must remain unconnected - grounding or routing it risks introducing parasitic coupling, noise injection, or unintended current paths that may degrade timing accuracy or cause erratic behavior. Leaving Pin 7 floating per the UC3705DTR layout guidelines ensures guaranteed performance compliance.
How does thermal shutdown function in UC3705DTR, and is it auto-recovering?
UC3705DTR incorporates a thermal shutdown circuit that disables the output stage when junction temperature reaches 155°C. Once temperature falls below the hysteresis threshold (~140°C), normal operation resumes automatically - no external reset or power cycle is needed. This auto-recovery behavior is confirmed in the SLUS370D datasheet and makes UC3705DTR suitable for transient-overload scenarios in unattended industrial systems.
UC3705DTR 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UC3705DTR FAQ
1.How can I place an order for UC3705DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3705DTR 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 UC3705DTR reliable?
The price and inventory of UC3705DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3705DTR is usually 5 days.
3.What payment methods are accepted for UC3705DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3705DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3705DTR?
UC3705DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3705DTR 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 UC3705DTR?
For technical support, including UC3705DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3705DTR requirements.
6.How does Aetrix verify that UC3705DTR is sourced from the original manufacturer or authorized distributors?
All UC3705DTR 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 UC3705DTR meets industry standards.
7.What is the process for return or replacement of UC3705DTR?
All UC3705DTR units undergo pre-shipment inspection (PSI). If there is an issue with UC3705DTR, 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 UC3705DTR part is unused and in its original packaging.
Return procedure for UC3705DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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