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AC/DC 和 DC/DC 控制器 (外部 FET)

LM5148

現行

3.5-V 至 80-V、電流模式同步降壓轉換器

立即訂購
產品規格表

LM5148

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 Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 55 Iq (typ) (A) 0.000009 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 Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 55 Iq (typ) (A) 0.000009 Duty cycle (max) (%) 99 Number of phases 2
VQFN (RGY) 24 19.25 mm² 5.5 x 3.5
  • 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
  • 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.

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.
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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 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)。

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
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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
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計算工具

LM5148-LM25148DESIGN-CALC — LM5148 和 LM25148 控制器快速入門設計工具

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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PCB 佈局

LM25149-Q1EVM-2100 PCB Layout Files

SNVR501.ZIP (1990 KB)
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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 檢視選項
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