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AC/DC 和 DC/DC 控制器 (外部 FET)

LM5148-Q1

現行

具有超低 IQ 的車用 80V 同步降壓 DC/DC 控制器

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產品規格表

LM5148-Q1

現行
產品規格表 立即訂購

產品詳細資料

Vin (min) (V) 3.5 Vin (max) (V) 80 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 55 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 9 Duty cycle (max) (%) 99 Number of phases 2
Vin (min) (V) 3.5 Vin (max) (V) 80 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Rating Automotive Vout (min) (V) 0.8 Vout (max) (V) 55 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 9 Duty cycle (max) (%) 99 Number of phases 2
VQFN (RGY) 19 15.75 mm² 4.5 x 3.5 VQFN (RGY) 24 19.25 mm² 5.5 x 3.5
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • 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 25 Class 5 requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5V to 80V
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current of 2.3µA
    • No-load sleep current of 9.5µA
    • Internal soft-start ramp of 3ms
    • Stackable up to two phases
    • Internal bootstrap diode
  • Switching frequency from 100kHz to 2.2MHz
    • SYNC in and SYNC out capability
  • 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
  • VQFN-24 package with wettable flanks
  • VQFN-19 package for increased high voltage pin spacing (Figure 5-2)
  • Create a custom design using the LM5148-Q1 with WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • 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 25 Class 5 requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5V to 80V
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current of 2.3µA
    • No-load sleep current of 9.5µA
    • Internal soft-start ramp of 3ms
    • Stackable up to two phases
    • Internal bootstrap diode
  • Switching frequency from 100kHz to 2.2MHz
    • SYNC in and SYNC out capability
  • 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
  • VQFN-24 package with wettable flanks
  • VQFN-19 package for increased high voltage pin spacing (Figure 5-2)
  • Create a custom design using the LM5148-Q1 with WEBENCH Power Designer

The LM5148-Q1 is a 80V, 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-Q1 can be set up in dual-phase mode (paralleled output) with accurate current sharing for high-current applications. The device can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed.

The LM5148-Q1 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-Q1 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 3ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5148-Q1 controller comes in 3.5mm × 5.5mm, 24-pin VQFN and a 19-pin VQFN, 4.50mm × 3.5mm thermally enhanced packages with wettable flank pins to facilitate optical inspection during manufacturing. For high voltage applications that require additional pin spacing between low voltage pins and high voltage pins, the pin spacing was increased to 0.6mm by removing a pin. To increase the spacing from VIN to the exposed pad, the exposed pad was reduced to 1.7mm × 2.3mm.

The LM5148-Q1 is a 80V, 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-Q1 can be set up in dual-phase mode (paralleled output) with accurate current sharing for high-current applications. The device can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed.

The LM5148-Q1 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-Q1 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 3ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5148-Q1 controller comes in 3.5mm × 5.5mm, 24-pin VQFN and a 19-pin VQFN, 4.50mm × 3.5mm thermally enhanced packages with wettable flank pins to facilitate optical inspection during manufacturing. For high voltage applications that require additional pin spacing between low voltage pins and high voltage pins, the pin spacing was increased to 0.6mm by removing a pin. To increase the spacing from VIN to the exposed pad, the exposed pad was reduced to 1.7mm × 2.3mm.
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類型 標題 日期
* Data sheet LM5148-Q1 80V, Automotive, Synchronous, Buck DC/DC Controller With Ultra-Low IQ and Dual Random Spread Spectrum datasheet (Rev. A) PDF | HTML 2025年 1月 23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-Q1 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)。

開發板

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

LM25149-Q1EVM-2100 高密度評估模組 (EVM) 的設計目的在於展示 LM25149-Q1 高性能、車用同步降壓 DC/DC 降壓控制器。此評估模組可以在 5.5 V 至 36 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 5-V 輸出。LM25149-Q1 提供先進 EMI 性能和超低 IQ。發生故障期間的穩壓器功能包括：電壓過低鎖定、內部緩啟動、Hiccup 模式過電流防護以及過熱自動關機。另外還提供開漏 PGOOD 指示器和 SYNC IN / SYNC OUT 模式功能。
使用指南: PDF | HTML
開發板

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。

使用指南: PDF | HTML
計算工具

LM5148-LM25148DESIGN-CALC — LM5148/-Q1 and LM25148/-Q1 controller quickstart design tool

Welcome to the quickstart design tool for the LM5148, LM5148-Q1, LM25148 and LM25148-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the above controller family. As such, the user can expeditiously arrive at an (...)
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產品
AC/DC 和 DC/DC 控制器 (外部 FET)
LM5148 — 3.5-V 至 80-V、電流模式同步降壓轉換器 LM5148-Q1 — 具有超低 IQ 的車用 80V 同步降壓 DC/DC 控制器 LM25148 — 具有超低 IQ 的 42-V 同步降壓 DC/DC 控制器 LM25148-Q1 — 具有超低 IQ 的車用 42-V 同步降壓 DC/DC 控制器
硬體開發
開發板
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 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
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PCB 佈局

LM25149-Q1EVM-2100 PCB Layout Files

SNVR501.ZIP (1990 KB)
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參考設計

PMP23392 — 使用 GaN FET 且適用於 48V 汽車應用的雙相位降壓轉換器參考設計

此參考設計運用兩個 LM5148-Q1 單相同步降壓控制器，以及四個配置為雙相位、交錯式、同步降壓轉換器的 LMG3100R017 GaN FET。轉換器會產生穩壓的 5V 輸出，能夠向負載提供額定 30A 電流，並且具備 60A 的峰值電流能力，可接受 24Vin 至 60Vin (額定 48Vin) 之間的輸入電壓。此設計以 6 層 PCB 為基礎，且六層各有 2-oz 的銅。評估板的尺寸為 5.0” x 3.4” (127.00mm x 86.36mm)，但實際的轉換器解決方案尺寸約為 53.5mm x (...)
Test report: PDF
參考設計

PMP23420 — 適合 48V 汽車應用的雙相交錯式同步降壓轉換器參考設計

此參考設計運用兩個 LM5148-Q1 單相同步降壓控制器，其配置為雙相位、交錯式、同步降壓轉換器。  轉換器會產生穩壓的 5V 輸出，能夠向負載提供額定 30A 電流，並且具備 60A 的峰值電流能力，可接受 24Vin 至 60Vin (額定 48Vin) 之間的輸入電壓。  此設計以 6 層 PCB 為基礎，且六層各有 2-oz 的銅。  評估板的尺寸為 5.2” x 3.4” (132.08mm x 86.36mm)，但實際的轉換器解決方案尺寸約為 55mm x 53mm。   此板經過最佳化，可在整個負載電流範圍內發揮高效率，若要達成此目標，只需設定轉換器在低負載時以脈衝頻率調變 (...)
Test report: PDF
參考設計

PMP31349 — 具有 GaN 開關的 30V 至 60V 輸入、240W 降壓轉換器參考設計

此參考設計為從額定 48V 電池輸入（範圍 30V 至 60V）產生穩壓 12V 輸出的電源供應器。電路專為 20A 連續輸出電流所設計。LM5148-Q1 降壓控制器透過整合式閘極驅動器，向 LMG2100R044 半橋 GaN 功率級提供切換訊號。
Test report: PDF
參考設計

PMP31252 — 適合車用的 150W 雙相同步降壓轉換器參考設計

本設計展示可當成雙輸出轉換器使用的低 EMI、雙相位降壓轉換器。作為雙相轉換器，此電路可提供 22A 的連續輸出電流和 30A 峰值電流，並具備 12V 至 5V 配置。
Test report: PDF
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VQFN (RGY) 24 Ultra Librarian
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