UCC27511A - 4A/8A Low-Side Gate Driver | Texas Instruments
MPN： UCC27511A ✓ 啟用中UCC27511A 概覽
A low-side gate driver is a type of power management IC that amplifies control signals from a controller to efficiently switch a ground-referenced power transistor. It sits between the PWM controller and the gate of a MOSFET or IGBT, providing the high peak currents needed to charge and discharge the gate capacitance quickly. This reduces switching losses and improves efficiency in power converters. The UCC27511A belongs to the gate driver family, which is a subset of power management ICs essential for modern power electronics.
Key features include a 13-ns propagation delay, 4-A source and 8-A sink peak currents, and a 5-V UVLO (undervoltage lockout) with hysteresis. The split outputs allow independent control of rise and fall times, enabling designers to optimize switching performance and reduce EMI. The device also features a robust design that minimizes shoot-through current, enhancing reliability in noisy environments.
Technically, the UCC27511A uses a CMOS-based architecture that provides rail-to-rail output swing and high noise immunity. The input stage can handle 5-V logic signals directly, simplifying interface with microcontrollers and PWM controllers. The device is available in a SOT-23-6 package, which is compact and suitable for space-constrained designs.
Typical applications include switch-mode power supplies, DC-to-DC converters, and companion gate-driver circuits for power modules. Its high-speed performance makes it ideal for synchronous rectification, active clamping, and other high-frequency topologies.
When designing with the UCC27511A, ensure proper decoupling of the VDD pin with a 1-uF ceramic capacitor placed close to the device. The split outputs allow tuning of gate drive strength; use separate resistors on OUTH and OUTL to adjust rise and fall times independently.
直接替換替代品，適用於 UCC27511A — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
UCC27511
✅ 直接替換📋 參考替代品（不在目錄中）
UCC27511AQDBVRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
UCC27531
✅ 直接替換📋 參考替代品（不在目錄中）
1EDN7550
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
UCC27517
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
UCC27511A 最大額定值與電氣特性
| Number of Channels | 1 |
| Peak Source Current | 4 A |
| Peak Sink Current | 8 A |
| Propagation Delay | 13 ns |
| 輸入電壓範圍 | 4.5 V to 18 V |
| UVLO Threshold | 5 V (typical) |
| 輸出配置 | Split outputs (OUTH, OUTL) |
| Input Logic Compatibility | 5 V |
| 工作溫度範圍 | -40°C to +140°C |
| 封裝 | SOT-23-6 |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| 致能腳位 | Yes |
UCC27511A 腳位配置
| 腳位 1 | IN — Input signal |
| 腳位 2 | GND — Ground |
| 腳位 3 | EN — Enable (active high) |
| 腳位 4 | OUTL — Low-side output (sink) |
| 腳位 5 | OUTH — High-side output (source) |
| 腳位 6 | VDD — Power supply |
典型應用
UCC27511A 適用於 6 應用s: Switch-Mode Power Supplies, DC-to-DC Converters, Companion Gate-Driver Circuits, Motor Drives, GaN Power Devices, Solar Inverters.
Switch-Mode Power Supplies
The UCC27511A is ideal for driving the power MOSFET in switch-mode power supplies (SMPS). Its 4-A source and 8-A sink currents enable fast switching, reducing switching losses and improving efficiency. The 13-ns propagation delay ensures precise timing, critical for synchronous rectification and active clamping. The wide input voltage range (4.5V to 18V) accommodates various control ICs, and the split outputs allow independent tuning of turn-on and turn-off speeds to optimize EMI and efficiency.
推薦
DC-to-DC Converters
In DC-to-DC converters, the UCC27511A drives the low-side MOSFET in buck, boost, and buck-boost topologies. Its high peak currents ensure rapid gate charging, minimizing dead time and reducing body diode conduction losses. The 5-V UVLO ensures reliable operation during startup, and the enable pin allows power sequencing in multi-rail systems. The compact SOT-23-6 package is ideal for space-constrained designs, and the 13-ns propagation delay supports high switching frequencies up to several MHz.
推薦
Companion Gate-Driver Circuits
The UCC27511A serves as a companion gate driver for power modules and discrete switches in various applications. It can be used to boost the drive capability of a PWM controller, providing the high peak currents needed for large gate capacitances. The split outputs allow independent control of rise and fall times, enabling designers to tailor switching behavior for specific applications. Its robust design minimizes shoot-through current, enhancing reliability in noisy industrial environments.
推薦
Motor Drives
The UCC27511A can be used in motor drive applications to drive the low-side MOSFETs in inverter stages. Its fast propagation delay and high peak currents enable efficient switching at high PWM frequencies, reducing losses and improving motor control accuracy. The enable pin allows for safe shutdown during fault conditions. The device's wide operating temperature range (-40°C to +140°C) makes it suitable for industrial motor drives operating in harsh environments.
推薦
GaN Power Devices
The UCC27511A is rated for driving GaN power devices, which require fast, high-current gate drive to minimize switching losses. Its 4-A source and 8-A sink currents provide the necessary charge for GaN gates, and the 13-ns propagation delay ensures precise timing. The split outputs allow independent control of turn-on and turn-off, which is critical for GaN devices to avoid overshoot and ringing. The device's low output impedance and rail-to-rail swing are well-suited for GaN's low threshold voltage.
推薦
Solar Inverters
In solar inverters, the UCC27511A drives the low-side MOSFETs in boost converters and inverter stages. Its high peak currents and fast switching reduce losses, improving overall system efficiency. The wide input voltage range allows operation from various control ICs, and the enable pin enables safe shutdown during grid faults. The device's robust design ensures reliable operation in outdoor environments with wide temperature variations.
推薦
推薦產品摘要
工程參考資料，適用於 UCC27511A — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | UCC27511 | UCC27511AQDBVRQ1 | UCC27531 | 1EDN7550 |
|---|---|---|---|---|---|
| Package | SOT-23-6 | SOT-23-6 | SOT-23-6 | SOT-23-6 | SOT-23-6 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Infineon |
| Peak Source Current | 4 A | 4 A | 4 A | 4 A | 4 A |
| Peak Sink Current | 8 A | 8 A | 8 A | 8 A | 8 A |
主要差異化特點
- Enhanced noise immunity (對比UCC27511)
- 5-V input handling (對比UCC27511)
- Automotive grade option (對比UCC27511A)
設計說明
Place a 1-uF ceramic capacitor as close as possible to the VDD pin to ensure stable operation and minimize voltage dips during switching. Use a low-inductance ground connection to reduce ringing. The split outputs (OUTH and OUTL) allow independent gate resistors; use separate resistors to tune rise and fall times for optimal EMI and efficiency.
The UCC27511A in SOT-23-6 package has limited thermal dissipation capability. At high switching frequencies and large gate charges, power dissipation can be significant. Ensure adequate copper area on the PCB for heat sinking. For high-power applications, consider using a driver with a larger package or external heat management.
Do not exceed the absolute maximum supply voltage of 18V. The enable pin can handle 5V logic, but ensure the input signal does not exceed the VDD voltage. When driving GaN devices, pay attention to the gate loop inductance; keep the driver close to the transistor to minimize parasitic effects.
合規資訊
RoHS compliant per TI product page. AEC-Q100 qualified variant available (UCC27511AQDBVRQ1).
