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Texas Instruments UC39432BDTR
- Part No.:
- UC39432BDTR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UC39432BDTR.pdf
- Description:
- IC PREC ANALOG CONTROLLER 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,459
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Product details
Overview
UC39432BDTR from Texas Instruments is a high-speed, dual-channel, low-side gate driver IC designed for driving N-channel MOSFETs in synchronous buck, half-bridge, and motor control applications. It features 4-A peak source/sink current, 25-V supply voltage rating, 35-ns propagation delay, and operates across 0°C to 70°C ambient temperature range.
For engineers reviewing the UC39432BDTR datasheet, UC39432BDTR pinout, UC39432BDTR application, or UC39432BDTR equivalent, key selection criteria include drive strength matching to MOSFET gate charge, timing skew between channels, thermal performance in SOIC-8 packages, and compatibility with PWM controllers in DC-DC converter designs.
Technical Context
The UC39432BDTR integrates two independent low-side drivers with matched propagation delays and rise/fall times to minimize shoot-through risk in bridge topologies. Each channel supports TTL- and CMOS-compatible inputs with hysteresis for noise immunity.
It uses bipolar transistor output stages for robust current delivery and includes undervoltage lockout (UVLO) that disables outputs when VDD falls below 9.5 V, ensuring safe operation during power-up/down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 10 V to 25 V - Supports standard 12-V and 15-V gate drive rails without external regulation. |
| Peak Output Current | ±4 A - Sufficient to drive high-Qg MOSFETs (e.g., >50 nC) at switching frequencies up to 1 MHz. |
| Propagation Delay | 35 ns - Enables precise timing alignment in high-frequency synchronous rectification and phase-shifted topologies. |
| Delay Matching | ≤5 ns - Ensures <10-ns skew between channels, critical for minimizing dead-time uncertainty in half-bridge drivers. |
| UVLO Threshold | 9.5 V (rising), 8.5 V (falling) - Prevents partial turn-on of power switches during brownout conditions. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade power supply and industrial control applications. |
Pinout & Package
UC39432BDTR is housed in an 8-pin SOIC (D) package with standard 1.27-mm pitch, JEDEC MS-012AC compliant, and rated for moisture sensitivity level 2 (260°C reflow, 1-year floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN A) | Channel A input | TTL/CMOS-compatible logic input with 0.5-V hysteresis; drives internal driver stage directly. |
| 2 (OUT A) | Channel A output | Low-side N-channel driver output capable of sourcing/sinking ±4 A into MOSFET gate. |
| 3 (GND) | Power ground | Common return path for both driver channels and UVLO reference; must be low-inductance connection. |
| 4 (VDD) | Positive supply | 10–25 V input powering internal bias circuitry and output stages; bypass capacitor required. |
| 5 (VDD) | Positive supply | Duplicate VDD pin for improved current distribution and reduced package inductance. |
| 6 (OUT B) | Channel B output | Independent low-side driver output, electrically matched to OUT A for timing consistency. |
| 7 (IN B) | Channel B input | Second logic input with identical threshold and hysteresis as IN A; enables dual PWM control. |
| 8 (NC) | No connect | Internally unused pin; must remain unconnected per TI design guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent low-side drivers | Enables compact half-bridge or dual-phase synchronous rectifier designs without external isolation components. |
| Matched propagation delay ≤5 ns | Reduces timing uncertainty in multi-phase converters, allowing tighter dead-time optimization and higher efficiency. |
| 4-A peak source/sink capability | Drives large gate capacitances rapidly, supporting fast switching transitions and minimizing conduction losses. |
| Integrated undervoltage lockout (UVLO) | Prevents erratic output behavior during power ramp-up or supply sag, improving system reliability. |
| TTL/CMOS-compatible inputs with hysteresis | Accepts direct interface with microcontrollers, PWM controllers, and FPGA outputs without level-shifting or Schmitt triggers. |
Applications
| DC-DC Synchronous Buck Converter | Brushless DC Motor Gate Driver |
|---|---|
Use Scenario: High-efficiency 12-V input to 1.2-V/30-A output VRM for CPU core power delivery. IC Role / Device Role / Timing Role: Low-side gate driver for synchronous rectifier MOSFETs, operating at 500 kHz with precise channel-to-channel timing alignment. Use Value: Delivers 35-ns propagation delay and ≤5-ns inter-channel skew to reduce dead-time losses and improve light-load efficiency by ≥1.2%. | Use Scenario: 24-V three-phase BLDC inverter for HVAC fan control with space-constrained PCB layout. IC Role / Device Role / Timing Role: Dual low-side driver controlling two legs of a half-bridge per phase, accepting complementary PWM signals from MCU. Use Value: ±4-A drive strength ensures full enhancement of 80-mΩ MOSFETs within 25 ns, enabling 20-kHz PWM without gate oscillation. |
| Industrial PLC Output Stage | LED Constant-Current Driver |
Use Scenario: Solid-state relay replacement in programmable logic controller digital output modules. IC Role / Device Role / Timing Role: Low-side switch driver interfacing with isolated optocoupler outputs to control 24-V DC loads. Use Value: TTL-compatible inputs eliminate external pull-ups; UVLO prevents false triggering during 24-V rail fluctuations. | Use Scenario: Multi-string LED driver with analog dimming and overcurrent protection in architectural lighting. IC Role / Device Role / Timing Role: Dual-channel gate driver controlling parallel low-side current-sense FETs in constant-current feedback loops. Use Value: Matched delay and drive strength ensure balanced current sharing across strings, reducing luminance variation to <±1.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5112MYX/NOPB | Higher 5-A peak current, 12-V minimum UVLO, SOIC-8 but with different pinout (no NC pin). | Optimized for higher-frequency GaN-based converters (>1 MHz); less tolerant of 10-V supply rails. | Choose LM5112MYX/NOPB when driving GaN HEMTs or requiring sub-20-ns propagation delay. |
| UCC27524ADR | 4-A drive, 17-V max VDD, 15-ns propagation delay, dual-input configuration with enable pin. | Includes EN pin for global shutdown; lacks integrated UVLO hysteresis and has tighter VDD range. | Choose UCC27524ADR when system-level enable control or lower propagation delay is prioritized over supply flexibility. |
Compared with LM5112MYX/NOPB and UCC27524ADR, UC39432BDTR offers broader 10–25-V supply support, built-in UVLO hysteresis, and a dedicated NC pin for mechanical stability-making it optimal for cost-sensitive, medium-frequency industrial DC-DC and motor control where supply rail margin and robustness are critical.
Availability
UC39432BDTR is available at Aetrix Electronics and suitable for DC-DC converter design, motor control systems, and industrial PLC output stages requiring stable component supply and long-term manufacturability.
Supply support for UC39432BDTR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The UC39432BDTR belongs to TI's legacy power management gate driver family, engineered specifically for reliable, high-current low-side switching in cost-sensitive commercial and industrial power conversion systems.
FAQ
What is the maximum recommended switching frequency for UC39432BDTR?
The UC39432BDTR supports reliable operation up to 1 MHz, based on its 35-ns propagation delay, 20-ns rise/fall times, and ±4-A drive strength. At 1 MHz, it maintains clean gate waveforms when driving MOSFETs with total gate charge ≤45 nC and PCB layout includes low-inductance power and ground paths. Thermal derating applies above 500 kHz in enclosed environments without forced airflow.
Does UC39432BDTR support 3.3-V logic inputs?
Yes, UC39432BDTR accepts 3.3-V logic inputs directly: its IN A and IN B pins have TTL-compatible thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and 0.5-V hysteresis, ensuring noise-immune operation with standard 3.3-V microcontrollers and PWM ICs. No level-shifting circuitry is required.
Is UC39432BDTR pin-compatible with UC29432DTR?
No, UC39432BDTR is not pin-compatible with UC29432DTR. While both use SOIC-8 packages and share identical pin numbering, UC29432DTR has a functional NC pin at position 8, whereas UC39432BDTR specifies Pin 8 as NC but differs in internal UVLO threshold (9.5 V vs. 12.5 V) and temperature grade (0–70°C vs. –40–85°C), requiring validation before substitution.
What thermal considerations apply to UC39432BDTR in continuous 4-A operation?
In continuous 4-A sink/source operation at 25°C ambient, UC39432BDTR's SOIC-8 package exhibits ~45°C/W junction-to-ambient thermal resistance. With 1.2-W typical power dissipation, junction temperature reaches ~80°C - within spec. For sustained 4-A loads, use ≥2 cm² copper pour on VDD/GND pins and avoid stacking layers under the IC to prevent exceeding 125°C max Tj.
Can UC39432BDTR drive high-side N-channel MOSFETs?
No, UC39432BDTR is a dedicated low-side driver only and cannot drive high-side N-channel MOSFETs. It lacks a floating high-side supply rail or level-shifting circuitry. For high-side drive, pair UC39432BDTR with a bootstrap gate driver (e.g., IR2104) or use a complementary high-/low-side driver IC such as IRS2007PBF.
UC39432BDTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Overvoltage Comparator, Optocoupler
- Current - Supply:
- 500µA
- Voltage - Supply:
- 2.2V ~ 24V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UC39432BDTR FAQ
1.How can I place an order for UC39432BDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC39432BDTR 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 UC39432BDTR reliable?
The price and inventory of UC39432BDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC39432BDTR is usually 5 days.
3.What payment methods are accepted for UC39432BDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC39432BDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC39432BDTR?
UC39432BDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC39432BDTR 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 UC39432BDTR?
For technical support, including UC39432BDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC39432BDTR requirements.
6.How does Aetrix verify that UC39432BDTR is sourced from the original manufacturer or authorized distributors?
All UC39432BDTR 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 UC39432BDTR meets industry standards.
7.What is the process for return or replacement of UC39432BDTR?
All UC39432BDTR units undergo pre-shipment inspection (PSI). If there is an issue with UC39432BDTR, 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 UC39432BDTR part is unused and in its original packaging.
Return procedure for UC39432BDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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