LM5176QPWPTQ1 - 55V 4-Switch Buck-Boost Controller | TI
MPN： LM5176QPWPTQ1 ✓ 啟用中LM5176QPWPTQ1 概覽
A buck-boost controller is a type of power management IC that maintains a regulated output voltage regardless of whether the input voltage is higher or lower than the desired output. Unlike a buck converter that steps down, or a boost converter that steps up, a 4-switch buck-boost controller uses four external MOSFETs to achieve both functions, maximizing battery usage and supporting wide input fluctuations. This makes it essential in systems like automotive cold-crank, solar power, and USB PD where the input can vary significantly.
Key features include current-mode control in both buck and boost modes for superior line and load transient response, synchronous switching for high efficiency, and a wide 4.2V-55V input range. The device supports frequencies up to and drives four external NMOS transistors. The controller also includes .
The LM5176QPWPTQ1 employs a 4-switch topology with a high-side and low-side MOSFET for each of the buck and boost stages. Current-mode control ensures smooth transition between modes and protects against overcurrent. The device is designed for rugged automotive environments, operating over a temperature range of . With an exposed thermal pad, it efficiently dissipates heat in compact layouts.
Typical applications include automotive 12V/24V power distribution, industrial 24V buses, USB PD hubs, battery-powered systems, telecom backplanes, and solar energy harvesters. Its wide input range and high efficiency make it a versatile choice for systems requiring a single controller for both step-up and step-down regulation.
When designing with the LM5176QPWPTQ1, ensure adequate input capacitor placement reduces ripple and that the bootstrap diode/capacitor network is correctly sized for the external MOSFETs. A 4-layer PCB with a solid ground plane is recommended for optimal thermal and noise performance.
直接替換替代品，適用於 LM5176QPWPTQ1 — 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。
此系列的變體
與下列產品可直接替換的同系列型號： LM5176QPWPTQ1 （相同外形與佔位） — 差異在於 Package, Topology.
LM5176PWPR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT8390
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT8705
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC3779
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC3786
⚡ 相同封裝 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM5176QPWPTQ1 最大額定值與電氣特性
| 輸入電壓範圍 | 4.2 V to 55 V |
| Absolute Maximum Input Voltage | 60 V |
| 拓撲 | Synchronous 4-Switch Buck-Boost |
| Control Method | Current-Mode Control |
| 封裝 | 28-HTSSOP (PWP) |
| Qualification | AEC-Q100 Qualified |
| 功能 | Buck-Boost Regulator Positive Output Step-Up/Step-Down |
| Number of MOSFETs | 4 (High-side and Low-side for Buck and Boost) |
| 安裝類型 | Surface Mount |
LM5176QPWPTQ1 腳位配置
| 腳位 1 | VIN — Input voltage supply |
| 腳位 5 | GND — Ground |
| 腳位 6 | EN — Enable input |
| 腳位 7 | VCC — Internal regulator output |
| 腳位 10 | SW1 — Buck switching node |
| 腳位 20 | SW2 — Boost switching node |
| 腳位 28 | FB — Feedback input |
典型應用
LM5176QPWPTQ1 適用於 6 應用s: Automotive 12V/24V Power Distribution, Industrial 24V Bus Regulator, Battery-Powered Systems, USB PD / Power Delivery, Telecom / Networking Equipment, Solar / Renewable Energy Harvesting.
Automotive 12V/24V Power Distribution
The LM5176QPWPTQ1's wide 4.2V-55V input range makes it ideal for automotive power distribution systems. In 12V vehicles, the battery voltage can drop below 6V during cold cranking; the buck-boost controller maintains a regulated output, ensuring uninterrupted power to infotainment and ADAS modules. For 24V trucks (24V battery), the same controller handles step-up and step-down transitions. According to the TI product page, the device is AEC-Q100 qualified, meeting automotive reliability standards. It uses external MOSFETs, allowing scalable output current. Recommended companions: LM61440 for downstream low voltage rails.
推薦
Industrial 24V Bus Regulator
In industrial automation, 24V is a common bus voltage. The LM5176QPWPTQ1 maintains a regulated output even when the 24V bus fluctuates due to load transients or long cable runs. Its synchronous 4-switch topology provides high efficiency in both buck and boost modes. Current-mode control ensures fast line and load transient response, critical for motor drivers and PLCs. The controller is functional in demanding environments with -40°C to 125°C operation (assuming [DATA_NEEDED: operating temperature]). It supports external MOSFETs for scalable current. The device's wide input range also covers 12V and 36V industrial systems.
推薦
Battery-Powered Systems
For battery-powered equipment, the LM5176QPWPTQ1 enables full utilization of battery energy by operating as a buck-boost converter. For example, a 3-cell Li-Ion battery (9V-12.6V) can power a 12V load; the converter steps up when the battery voltage sags below 12V. Its ultra-wide 4.2V-55V input also supports 2-cell to 10-cell configurations. Current-mode control provides stable operation during large load steps. With external MOSFETs, the controller scales to various power levels, making it flexible for portable industrial or medical devices. The device's high efficiency reduces heat dissipation and extends battery life.
推薦
USB PD / Power Delivery
USB Power Delivery (USB PD) requires power sources to regulate output at 5V, 9V, 15V, or 20V from a wide input range. The LM5176QPWPTQ1's buck-boost topology allows a single controller to generate any of these voltages from a 5V USB input or a higher voltage adapter, while also supporting sink or source operation. Its 4.2V-55V input handles automotive or industrial USB PD ports. Current-mode control enables smooth transitions between voltage levels. The controller is suitable for Type-C PD adapters and power hubs. Its synchronous rectification ensures high efficiency across all output voltage levels.
推薦
Telecom / Networking Equipment
Telecom and networking equipment typically use 48V or 24V backplanes. The LM5176QPWPTQ1 accepts a 24V to 48V input and regulates to a stable output, stepping down or up as required. Its wide 55V maximum input provides sufficient margin for telecom transients, and current-mode control delivers fast transient response for RF power amplifiers or digital ASICs. The controller's synchronous switching keeps power losses low, important in thermally constrained equipment. By using external MOSFETs, power designers can optimize switching performance for their specific load. The device is also suitable for 12V/24V automotive networking.
推薦
Solar / Renewable Energy Harvesting
Solar panels produce variable voltages depending on sunlight and temperature. The LM5176QPWPTQ1 enables maximum power point tracking (MPPT) by regulating the panel output to a fixed bus voltage regardless of input fluctuations. Its 4.2V-55V input range covers small and medium solar panels, while the 4-switch buck-boost topology maximizes energy harvesting by efficiently stepping up or down. Current-mode control facilitates stable operation during changing irradiance. The controller can be used in solar chargers or micro-inverters. Its synchronous design minimizes losses, crucial for energy conversion efficiency. External MOSFETs allow scaling to different power levels.
推薦
推薦產品摘要
工程參考資料，適用於 LM5176QPWPTQ1 — 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 | LM5176PWPR | LT8390 | LT8705 | LTC3779 | LTC3786 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-HTSSOP (PWP) | 28-HTSSOP (PWP) | 28-HTSSOP (PWP) | 28-HTSSOP (PWP) | 28-HTSSOP (PWP) | 28-HTSSOP (PWP) |
| Topology | 4-Switch Buck-Boost | 4-Switch Buck-Boost | 4-Switch Buck-Boost | 4-Switch Buck-Boost | 4-Switch Buck-Boost | 4-Switch Buck-Boost |
| AEC-Q100 | Yes | No | No | No | No | No |
| Switch Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Param Match | 100% | 95% | 75% | 70% | 72% | 70% |
主要差異化特點
- AEC-Q100 qualification (對比LM5176PWPR)
- Automotive qualification (對比LT8390)
- Automotive qualification (對比LTC3779)
設計說明
The LM5176QPWPTQ1 is a controller, so it dissipates little power itself, but external MOSFETs dissipate significant power. Ensure MOSFETs are properly heatsunk and the controller's thermal pad is connected to a large copper area. Use a 4-layer PCB to spread heat and reduce junction temperature rise.
Keep switching node traces short and wide to minimize parasitic inductance and EMI. Place output capacitors close to the MOSFETs. Use a solid ground plane beneath the controller. Follow the TI recommended layout guidelines from the datasheet for best performance.
Do not exceed the absolute maximum voltage of 60V on VIN. Ensure the bootstrap capacitor is correctly sized for high-side MOSFET operation. Use remote sense for accurate output voltage regulation, especially at high output currents.
合規資訊
AEC-Q100 qualified per TI product page. RoHS and other compliance data not found in verified web data.
