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DC/DC 轉換器

LM70880

現行

高密度、4.5V 至 80V 輸入、8A 低 EMI 同步 DC/DC 降壓轉換器

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產品規格表

LM70880

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 8 Vin (max) (V) 80 Vin (min) (V) 4.5 Vout (max) (V) 55 Vout (min) (V) 0.8 Features Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Soft Start Fixed, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000065 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Buck Iout (max) (A) 8 Vin (max) (V) 80 Vin (min) (V) 4.5 Vout (max) (V) 55 Vout (min) (V) 0.8 Features Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Soft Start Fixed, Stackable, Thermal shutdown, UVLO adjustable EMI features Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000065 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
VQFN (RRX) 29 36 mm² (6 mm × 6 mm)
  • Functional Safety-Capable
  • Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs
    • Wide input voltage range: 4.5V to 80V
    • Shutdown mode current: 2.3µA
    • No-load IQ regulating 48V to 5V: 8.2µA
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 55V
    • Dual-phase operation enabling output currents up to 16A
  • Designed for low EMI requirements
    • Facilitates CISPR 11 Class B compliance
    • Pin-selectable ±8% dual-random spread spectrum reduces peak emissions
    • Switching frequency: 200kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
  • Inherent protection features for robust design
    • Internal hiccup-mode overcurrent protection
    • Enable, power good, and thermal shutdown
    • Internal or external loop compensation
  • 6mm × 6mm thermally optimized, RoHS compliant, QFN-29 package with Pb-free plating
  • Create a custom design using the LM708x0 with the WEBENCH Power Designer
  • Functional Safety-Capable
  • Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs
    • Wide input voltage range: 4.5V to 80V
    • Shutdown mode current: 2.3µA
    • No-load IQ regulating 48V to 5V: 8.2µA
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 55V
    • Dual-phase operation enabling output currents up to 16A
  • Designed for low EMI requirements
    • Facilitates CISPR 11 Class B compliance
    • Pin-selectable ±8% dual-random spread spectrum reduces peak emissions
    • Switching frequency: 200kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
  • Inherent protection features for robust design
    • Internal hiccup-mode overcurrent protection
    • Enable, power good, and thermal shutdown
    • Internal or external loop compensation
  • 6mm × 6mm thermally optimized, RoHS compliant, QFN-29 package with Pb-free plating
  • Create a custom design using the LM708x0 with the WEBENCH Power Designer

The LM708x0 is a family of low-IQ, wide-VIN synchronous buck converters designed for an input voltage range of 4.5V to 80V and delivering up to 8A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM708x0 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM708x0 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16A of output current.

The LM708x0 features a unique Dual Random Spread Spectrum (DRSS) function that combines low-frequency triangular and high-frequency cycle-by-cycle random modulations for improved EMI performance across a wide range of frequency bands.

Additional features of the LM708x0 include 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 2.8ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM708x0 converter comes in a 6mm × 6mm thermally-optimized, 29-pin QFN package. The three die-attach pads (VIN, SW, and PGND) improve thermal performance and board level reliability (BLR).

The LM708x0 is a family of low-IQ, wide-VIN synchronous buck converters designed for an input voltage range of 4.5V to 80V and delivering up to 8A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM708x0 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM708x0 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16A of output current.

The LM708x0 features a unique Dual Random Spread Spectrum (DRSS) function that combines low-frequency triangular and high-frequency cycle-by-cycle random modulations for improved EMI performance across a wide range of frequency bands.

Additional features of the LM708x0 include 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 2.8ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM708x0 converter comes in a 6mm × 6mm thermally-optimized, 29-pin QFN package. The three die-attach pads (VIN, SW, and PGND) improve thermal performance and board level reliability (BLR).
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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 LM708x0 80V, 8A/6A/4A, High-Efficiency Buck Converters Designed for High Power Density datasheet PDF | HTML 2024/9/19
應用說明 Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 2024/10/2
功能安全資訊 LM70880, LM70860, and LM70840 Functional Safety FIT Rate, FMD, and Pin FMA PDF | HTML 2024/9/19
應用說明 Reducing Conducted EMI in a Buck Converter for 48 V Automotive Applications PDF | HTML 2023/12/13
電子書 An Engineer’s Guide to Low EMI in DC/DC Regulators 2021/4/21
技術文章 Using DC/DCs buck converters to power modern safety features in commercial vehicle PDF | HTML 2020/7/27
技術文章 How to meet European Commission ADAS requirements with TI DC/DC converters PDF | HTML 2019/5/9
技術文章 Top three qualities to consider when designing a video doorbell power supply PDF | HTML 2018/9/25
Application brief Improving RF Power Amplifier Efficiency in 5G Radio Systems 2018/9/5
白皮書 An overview of radiated EMI specifications for power supplies 2018/6/5
技術文章 Effects of IC package on EMI performance PDF | HTML 2018/5/22
白皮書 An overview of conducted EMI specifications for power supplies 2018/2/1

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

LM706A0QEVM — LM706A0-Q1 評估模組

LM706A0-Q1 高密度評估模組 (EVM) 設計為使用從 8V 至 65V 的穩壓或非穩壓高電壓輸入軌，可在最高 10A 的負載電流下產生嚴格穩壓的 3.3V 輸出電壓。這款 VIN 範圍廣泛的 DC/DC 解決方案提供超大額定電壓與運作裕度，可承受供應軌電壓暫態。自由運轉切換頻率為 400kHz，並且能與頻率較高或較低的外部時脈訊號同步。為這款 EVM 選擇的動力系統被動元件符合汽車 AEC-Q200 標準，且可從多個元件廠商購買。

使用指南: PDF | HTML
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開發板

LM70880QEVM — LM70880-Q1 評估模組

LM70880QEVM 高密度評估模組設計用於使用 8V 至 72V 範圍的穩壓或非穩壓高電壓輸入軌，在負載電流高達 8A 時產生嚴格穩壓的 5V 輸出電壓。LM70880-Q1 具有高轉換效率、卓越的熱性能和先進的 EMI 抑制功能。
使用指南: PDF | HTML
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模擬型號

LM70880-Q1 PSpice Transient model (Rev. A)

SNVMCD7A.ZIP (3292 KB) - PSpice 模型
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模擬工具

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI 是有助於評估類比電路功能的設計和模擬環境。這款全功能設計和模擬套件使用 Cadence® 的類比分析引擎。PSpice for TI 包括業界最大的模型庫之一，涵蓋我們的類比和電源產品組合，以及特定類比行為模型，且使用無需支付費用。

PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前，建立完整的終端設備設計和解決方案原型，進而縮短上市時間並降低開發成本。 

在 PSpice for TI 設計與模擬工具中，您可以搜尋 TI (...)
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計算工具

LM70XX0-CALC — LM70XX0 quickstart design tool calculator

Quickstart calculator for LM70XX0
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參考設計

PMP31291 — 27W 反相降壓升壓參考設計

此參考設計是靈活且精巧的電源供應器，可提供負輸出電壓軌。此設計包括 LM70880-Q1 裝置 (80V、8A 高效率降壓轉換器)。輸出電壓值可在三個預先定義的設定中選擇：-7V/-10V/-11V。

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VQFN (RRX) 29 Ultra Librarian
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