LM51571-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C T A
- Functional Safety-Capable
- Suited for wide operating range for car battery applications
- 2.9-V to 45-V input operating range
- 48-V maximum output (50-V abs max)
- Minimum boost supply voltage of 1.5 V when BIAS ≥ 2.9 V
- Input transient protection up to 50 V
- Minimized battery drain
- Low shutdown current (I Q ≤ 2.6 µA)
- Low operating current (I Q ≤ 700 µA)
- Small solution size and low cost
- Maximum switching frequency up to 2.2 MHz
- 16-pin QFN package (3 mm × 3 mm) with wettable flanks
- Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
- Minimized undershoot during cranking (start-stop application)
- Accurate current limit (see the Device Comparison Table)
- EMI mitigation
- Selectable dual random spread spectrum
- Lead-less package
- Higher efficiency with low-power dissipation
- 45-mΩ R DSON switch
- Fast switching, small switching loss
- Avoid AM band interference and crosstalk
- Optional clock synchronization
- Dynamically programmable wide switching frequency from 100 kHz to 2.2 MHz
- Integrated protection features
- Constant current limiting over input voltage
- Selectable hiccup mode overload protection
- Programmable line UVLO
- OVP protection
- Thermal shutdown
- Accurate ±1% accuracy feedback reference
- Adjustable soft start
- PGOOD indicator
- Create a custom design using the LM5157x-Q1 with the WEBENCH Power Designer
The LM5157x-Q1 device is a wide input range, non-synchronous boost converter with integrated 50-V, 6.5-A (LM5157-Q1) or 50-V, 4.33-A (LM51571-Q1) power switch.
The device can be used in boost, SEPIC, and flyback topologies. The device can start up from a single-cell battery with a minimum of 2.9 V. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 2.9 V.
技術文件
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| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum datasheet (Rev. B) | PDF | HTML | 2023/5/9 | ||
| 白皮書 | Isolated Bias Power Supply Architecture for HEV and EV Traction Inverters | PDF | HTML | 2023/10/11 | |||
| 應用說明 | How to Implement the Soft Start in a Flyback | PDF | HTML | 2023/7/10 | |||
| 應用說明 | How to Design an Isolated Flyback Converter Using LM5157x/LM5158x (Rev. A) | PDF | HTML | 2023/3/16 | |||
| 應用說明 | Basic Calculation of a Coupled Inductor SEPIC Power Stage | PDF | HTML | 2023/3/13 | |||
| 應用說明 | EMI Reduction Technique, Dual Random Spread Spectrum (Rev. A) | 2022/10/19 | ||||
| 功能安全資訊 | LM5157x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) | PDF | HTML | 2022/2/11 | |||
| 應用說明 | How to Design a Boost Converter Using LM5157x, LM5158x | PDF | HTML | 2021/11/11 | |||
| 技術文章 | Lowering audible noise in automotive applications with TI’s DRSS technology | PDF | HTML | 2021/3/18 | |||
| 類比設計期刊 | The pros and cons of spread‐spectrum implementation methods in buck regulators | 2021/3/18 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
開發板
LM5157EVM-BST — LM5157 升壓轉換器評估模組
LM5157EVM-BST 評估模組展示 LM5157 裝置的功能和性能，此裝置為具備雙隨機展頻的寬輸入電壓升壓轉換器。標準配置的設計可在 3 V 至 9 V 輸入 (從 < 6 V 輸入起負載降低一半)、2.1 MHz 切換頻率時，在 1.6 A 時提供 12 V 的穩壓輸出。
開發板
LM5157EVM-FLY — LM5157 返馳升壓轉換器評估模組
LM5157EVM-FLY 評估模組展示 LM5157 做為返馳式轉換器的功能和性能，可為三相逆變器閘極驅動器偏壓電源的典型應用產生多重輸出電壓軌。 標準配置專為從 8-V 至 16-V 輸入在 250mA 提供 10-V 的穩壓輸出，以及分別在 75mA、75mA 及 150mA 提供三個隔離式 20-V 軌設計。 切換頻率為 250kHz。
開發板
LM5157EVM-SEPIC — 適用於 SEPIC 的 LM5157 評估模組
LM5157EVM-SEPIC 評估模組展示了 LM5157 作為寬輸入非同步 SEPIC 轉換器的功能和性能。標準配置的設計可在 4 V 至 32 V 輸入，在 2.1 MHz 下切換時，在最高 1 A 時提供 12 V 的穩壓輸出。
計算工具
SNVR508 — LM515x Quickstart Calculator for Flyback Regulator Design
計算工具
SNVR511 — LM5157 and LM5158 Quickstart Calculator for Boost Regulator Design
計算工具
SNVR512 — LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RTE) | 16 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。