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DC/DC 轉換器

LMQ644A2-Q1

現行

車用 36V、12A、低 IQ 雙輸出同步降壓轉換器

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產品規格表

LMQ644A2-Q1

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive Topology Buck Iout (max) (A) 12 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 20 Vout (min) (V) 0.8 Features Enable, Frequency synchronization, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, Wettable flanks package EMI features Fixed-frequency control, Integrated capacitors, Low parasitic packaging, Mitigated interference & noise technology – architecture 2 (MINT 2), Pinout optimization, Spread Spectrum, Switch-node waveshaping Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.00004 Duty cycle (max) (%) 98
Rating Automotive Topology Buck Iout (max) (A) 12 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 20 Vout (min) (V) 0.8 Features Enable, Frequency synchronization, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, Wettable flanks package EMI features Fixed-frequency control, Integrated capacitors, Low parasitic packaging, Mitigated interference & noise technology – architecture 2 (MINT 2), Pinout optimization, Spread Spectrum, Switch-node waveshaping Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.00004 Duty cycle (max) (%) 98
VQFN-FCRLF (RXA) 24 20 mm² (5 mm × 4 mm)
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Operation up to 150°C junction temperature
  • Functional Safety-Capable
  • Designed for Low EMI
    • Symmetrical input voltage pins with > 1mm clearance to ground
    • Four 22nF integrated VIN to GND bypass capacitors
      • Two bypass capacitors placed in series between each VIN and GND for high reliability
    • Pin selectable spread spectrum option
    • Pin selectable FPWM or auto mode operation
    • Enhanced HotRod™ QFN (25) package with wettable flanks
    • Switching frequency from 100kHz to 2.2MHz
    • Meets CISPR 25 class 5 EMI requirements
  • Single and dual-output features
    • Wide input voltage range of 3V to 36V
    • 1% accurate fixed 3.3V, 5V or adjustable outputs from 0.8V to 20V
    • Hiccup-mode overcurrent protection and thermal shutdown protection with hysteresis
    • Precision ENABLE and PGOOD functions
    • 50ns tON(min) for high VIN / VOUT ratio
    • 80ns tOFF(min) for low dropout
  • Versatile dual-output operation
    • Shutdown mode current: 0.5µA typical
    • No-load standby current: 9µA typical
    • Built-in compensation and 3ms soft start
    • Independent precision ENABLE and PGOOD
  • Adaptable single-output operation
    • > 95% efficient for an 8A load, single output, VIN =12V, VOUT = 5V
    • External compensation and adjustable soft start
    • PGOOD, SYNCIN, and SYNCOUT functions
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Operation up to 150°C junction temperature
  • Functional Safety-Capable
  • Designed for Low EMI
    • Symmetrical input voltage pins with > 1mm clearance to ground
    • Four 22nF integrated VIN to GND bypass capacitors
      • Two bypass capacitors placed in series between each VIN and GND for high reliability
    • Pin selectable spread spectrum option
    • Pin selectable FPWM or auto mode operation
    • Enhanced HotRod™ QFN (25) package with wettable flanks
    • Switching frequency from 100kHz to 2.2MHz
    • Meets CISPR 25 class 5 EMI requirements
  • Single and dual-output features
    • Wide input voltage range of 3V to 36V
    • 1% accurate fixed 3.3V, 5V or adjustable outputs from 0.8V to 20V
    • Hiccup-mode overcurrent protection and thermal shutdown protection with hysteresis
    • Precision ENABLE and PGOOD functions
    • 50ns tON(min) for high VIN / VOUT ratio
    • 80ns tOFF(min) for low dropout
  • Versatile dual-output operation
    • Shutdown mode current: 0.5µA typical
    • No-load standby current: 9µA typical
    • Built-in compensation and 3ms soft start
    • Independent precision ENABLE and PGOOD
  • Adaptable single-output operation
    • > 95% efficient for an 8A load, single output, VIN =12V, VOUT = 5V
    • External compensation and adjustable soft start
    • PGOOD, SYNCIN, and SYNCOUT functions

The LMQ644xx-Q1 is a 36V, synchronous, buck, DC/DC converter for high-current single or dual outputs. The device uses an interleaved, stackable, current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with an output clock supporting up to 6 phases for currents up to 36A. A high-side switch minimum on-time of 50ns gives large step-down ratios, enabling the direct conversion from 12V, 24V, or automotive inputs to low-voltage rails for reduced system complexity and design cost.

The LMQ644xx-Q1 incorporates spread spectrum in an optimized enhanced HotRod QFN package, with wettable flanks, and four 22nF high frequency integrated capacitors to minimize EMI. Dual Random Spread Spectrum (DRSS) frequency hopping is set to ±10% (typical), drastically reducing emissions through a combination of triangular and pseudo-random modulation. A bias pin allows the LMQ644xx-Q1 to save losses by powering the device from the output of the converter, achieving a 9µA no-load quiescent current to extend the operating run-time in battery-powered systems. The LMQ644xx-Q1 can maintain high efficiency light-load operation even when stacking multiple devices for high efficiency over the full load range.

The LMQ644xx-Q1 is a 36V, synchronous, buck, DC/DC converter for high-current single or dual outputs. The device uses an interleaved, stackable, current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with an output clock supporting up to 6 phases for currents up to 36A. A high-side switch minimum on-time of 50ns gives large step-down ratios, enabling the direct conversion from 12V, 24V, or automotive inputs to low-voltage rails for reduced system complexity and design cost.

The LMQ644xx-Q1 incorporates spread spectrum in an optimized enhanced HotRod QFN package, with wettable flanks, and four 22nF high frequency integrated capacitors to minimize EMI. Dual Random Spread Spectrum (DRSS) frequency hopping is set to ±10% (typical), drastically reducing emissions through a combination of triangular and pseudo-random modulation. A bias pin allows the LMQ644xx-Q1 to save losses by powering the device from the output of the converter, achieving a 9µA no-load quiescent current to extend the operating run-time in battery-powered systems. The LMQ644xx-Q1 can maintain high efficiency light-load operation even when stacking multiple devices for high efficiency over the full load range.

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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 LMQ644xx-Q1 3V to 36V, Low IQ , Dual 6/5/4A, Automotive Buck Converter Optimized for Power Density and Low EMI datasheet (Rev. A) PDF | HTML 2024/7/8
Product overview Mobileye EyeQ™6H – Discrete Power Tree PDF | HTML 2024/11/7
技術文章 Four power supply challenges in ADAS front camera designs PDF | HTML 2024/1/5
使用指南 LMQ644A2-Q1 6-Phase Buck Regulator Design for Automotive ADAS Applications PDF | HTML 2023/7/5
功能安全資訊 LMQ644xx-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 2023/6/27
證書 LMQ644A2QEVM-S2100 EU Declaration of Conformity (DoC) 2023/5/12
證書 LMQ644A2QEVM-D2100 EU Declaration of Conformity (DoC) 2023/5/11

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

LMQ644A2QEVM-D2100 — 適用於雙輸出同步降壓轉換器的 LMQ644A2-Q1 評估模組

LMQ644A2QEVM-D2100 評估模組 (EVM) 可運用整合式電源 MOSFET，評估 LMQ644A2-Q1 雙降壓 DC/DC 轉換器的功能和性能。EVM 提供雙 6 A 輸出。輸出電壓可個別編程至固定 3.3 V 和 5 V，也可使用外部反饋電阻進行調整。每個通道都可透過跨接器選擇來啟用和/或停用。

使用指南: PDF | HTML
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開發板

LMQ644A2QEVM-S2100 — 適用於單輸出同步降壓轉換器的 LMQ644A2-Q1 評估模組

LMQ644A2QEVM-S2100 評估模組 (EVM) 可運用整合式電源 MOSFET，評估 LMQ644A2-Q1 雙降壓 DC/DC 轉換器的功能和性能。EVM 提供 12 A 輸出。輸出電壓可個別編程至固定 3.3 V 和 5 V，也可使用外部反饋電阻進行調整。

使用指南: PDF | HTML
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模擬型號

LMQ644A2 PSPICE transient model

SNVMCC1.ZIP (249 KB) - PSpice 模型
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計算工具

LMQ644XX-DESIGN-CALC — LMQ644XX quick-start design tool

This stand-alone tool facilitates and assists with the design of a DC/DC buck regulator based on the LM(Q)64480/A0/A2-Q1 dual channel buck converter. The user can expeditiously arrive at an optimized design to meet the application requirements.
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參考設計

PMP23117 — 適合汽車應用的 3.3-V、24-A、四相參考設計

此四相參考設計可在 24 A 從 3.8-V 至 16-V 車用電源下提供 3.3 VOUT。此設計使用兩個以 500 kHz 額定切換頻率運作的 LMQ644A2-Q1 雙通道同步降壓穩壓器。用於輕負載運作的強制脈衝寬度調變 (FPWM) 或脈衝頻率調變 (PFM) 可選擇跨接器。為頻率同步、電源良好和頻率回應注入提供測試點。
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參考設計

PMP41085 — 具有功能安全功能的 100W 車用資訊娛樂顯示模組參考設計

此參考設計展示具有冷車啟動、負載突降及 FuSa 功能的 100W 車用資訊娛樂顯示模組電源參考設計。

LM74900-Q1 是設計的第一階段，扮演負極輸入電壓、欠電壓、鎖定輸出與過電流保護的防護角色。LM5152-Q1 是用作預升壓控制器的第二階段，如果啟動時電池電壓低，則可升壓至特定電壓。本裝置支援低至 4.2V 的電池電壓。在第三階段，此設計會使用 LMQ644A2-Q1、TPS62813-Q1 和 TPS745-Q1 為局部調光背光、TCON 和 SerDes 等子系統提供所需的電壓。最後，此設計會使用電壓監視器和比較器來監控每個電源軌，並輔助 ISO 26262 系統設計達成目標 (...)

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參考設計

TIPA-020000 — Mobileye EyeQ™6H 電源供應設計

此電源設計是適用於 Mobileye EyeQ™6H SoC 的離散式電源樹狀結構測試報告摘要。自動駕駛輔助系統 (ADAS) 等汽車應用採用 Mobileye EyeQ™6H 等 ADAS 網域控制器處理器。這些精密的處理器需要在極低的電壓下具有非常高的電流。這些處理器也需要非常快速的輸出電壓暫態響應，以因應處理器負載電流的步進變化。此德州儀器設計以有效率、符合成本效益的方式滿足快速暫態響應的嚴格要求。

這種離散式方法可實現負載點轉換器最佳放置，同時仍可提供具最小輸出電容的小型設計尺寸。

多通道電壓監控器用於監控所有 SoC 相關的電源軌。電源排序可透過任何外部安全 MCU 實作。

此電源設計的 (...)

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VQFN-FCRLF (RXA) 24 Ultra Librarian
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