LM5148
- Functional Safety-Capable
- Integrated EMI mitigation
- Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
- Optimized for CISPR 32 Class B requirements
- Versatile synchronous buck DC/DC controller
- Wide input voltage range of 3.5 V to 80 V
- 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
- 150°C maximum junction temperature
- Lossless DCR or shunt current sensing
- Shutdown mode current of 2.3 µA
- No-load sleep current of 9.5 µA
- Internal soft-start ramp of 3 ms
- Stackable up to two phases
- Internal bootstrap diode
- Switching frequency from 100 kHz to 2.2 MHz
- SYNC in and SYNC out capability
- Selectable PFM or FPWM modes
- Inherent protection features for robust design
- Internal hiccup mode overcurrent protection
- ENABLE and PGOOD functions
- VCC, VDDA, and gate-drive UVLO protection
- Internal or external loop compensation
- Thermal shutdown protection with hysteresis
- Create a custom design using the LM5148 with WEBENCH Power Designer
The LM5148 is a 80-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5148 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.
The LM5148 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM5148 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM5148 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package.
技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | LM5148 80-V, Synchronous, Buck DC/DC Controller with Ultra-Low IQ and Dual Random Spread Spectrum datasheet | PDF | HTML | 2023年 2月 15日 |
Application note | Controller to Converter – Design Considerations for 24V and 48V Systems | PDF | HTML | 2024年 10月 2日 | |
Application note | How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck | PDF | HTML | 2023年 8月 16日 | |
Functional safety information | LM5148 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2023年 2月 15日 | |
User guide | LM25149-Q1 EVM User's Guide (Rev. A) | PDF | HTML | 2022年 4月 29日 |
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)。
LM25149-Q1EVM-2100 — LM25149-Q1 5.5-V 至 36-V 低 IQ、同步降壓 DC/DC 控制器評估模組
LM5149-Q1EVM-400 — 搭載主動式 EMI 濾波器的 72-V、低 IQ、同步降壓 DC/DC 控制器的 LM5149-Q1 評估模組
LM5149-Q1EVM-400 高密度評估模組 (EVM) 的設計目的在於展示 LM5149-Q1 高性能、車用同步降壓 DC/DC 降壓控制器。EVM 可在 15 V 至 72 V 的廣泛輸入電壓範圍內運作,可提供高於 1% 設定點準確度,及高達 8-A 輸出電流的固定 12-V 輸出。LM5149-Q1 提供先進的 EMI 性能、超低 IQ 保護功能,可在穩壓器故障狀況下提供防護,包括電壓過低鎖定、內部緩啟動、打嗝模式過電流保護,以及過熱自動關機。該設備還包括開漏 PGOOD 指示器和 SYNC IN 功能。
封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
---|---|---|
VQFN (RGY) | 24 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點