LM5149

現行

具超低 IQ 和整合式主動 EMI 濾波器的 80-V 同步降壓 DC/DC 控制器

立即訂購

產品規格表

document-pdfAcrobat LM5149 80-V, Synchronous, Buck, DC/DC Controller with Ultra-Low IQ and Integrated Active EMI Filter datasheet (Rev. A) (英文) PDF | HTML

LM5149

現行

立即訂購

產品詳細資料

Rating

Catalog

Topology

Buck

Iout (max) (A)

20

Vin (max) (V)

80

Vin (min) (V)

3.5

Vout (max) (V)

55

Vout (min) (V)

0.8

Control mode

current mode

Features

Adjustable current limit, Enable, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable

EMI features

Active EMI filter, Spread Spectrum

Duty cycle (max) (%)

99

Iq (typ) (A)

0.0000095

Number of phases

2

Operating temperature range (°C)

-40 to 150

Rating

Catalog

Topology

Buck

Iout (max) (A)

20

Vin (max) (V)

80

Vin (min) (V)

3.5

Vout (max) (V)

55

Vout (min) (V)

0.8

Control mode

current mode

Features

Adjustable current limit, Enable, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable

EMI features

Active EMI filter, Spread Spectrum

Duty cycle (max) (%)

99

Iq (typ) (A)

0.0000095

Number of phases

2

Operating temperature range (°C)

-40 to 150

VQFN (RGY)

24

19.25 mm² (5.5 mm × 3.5 mm)

Functional Safety-Capable
- Documentation available to aid functional safety system design
Two integrated EMI mitigation mechanisms
- Active EMI Filter for enhanced EMI performance at lower frequencies
- Selectable dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
- EMI reduced by an average of 25 dBµV
- Reduces the external differential-mode input filter size by 50% and lowers systems cost
- 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
- Shutdown mode current: 2.3 µA
- No-load sleep current: 9.5 µA
- Stackable up to two phases
- Advanced dropout with frequency foldback
Switching frequency from 100 kHz to 2.2 MHz
- 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
Create a custom design using the LM5149 with WEBENCH Power Designer

Functional Safety-Capable
- Documentation available to aid functional safety system design
Two integrated EMI mitigation mechanisms
- Active EMI Filter for enhanced EMI performance at lower frequencies
- Selectable dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
- EMI reduced by an average of 25 dBµV
- Reduces the external differential-mode input filter size by 50% and lowers systems cost
- 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
- Shutdown mode current: 2.3 µA
- No-load sleep current: 9.5 µA
- Stackable up to two phases
- Advanced dropout with frequency foldback
Switching frequency from 100 kHz to 2.2 MHz
- 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
Create a custom design using the LM5149 with WEBENCH Power Designer

The LM5149 is a 80-V, ultra-low I_Q 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 LM5149 can be set up in interleaved dual-phase mode with accurate current sharing for high-current applications. The device can operate with V_IN as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM5149 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI 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 LM5149 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 and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5149- controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with an exposed pad to aid in thermal dissapation.

The LM5149 is a 80-V, ultra-low I_Q 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 LM5149 can be set up in interleaved dual-phase mode with accurate current sharing for high-current applications. The device can operate with V_IN as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM5149 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI 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 LM5149 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 and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5149- controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with an exposed pad to aid in thermal dissapation.

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重要文件	類型	標題	格式選項
*	資料表	LM5149 80-V, Synchronous, Buck, DC/DC Controller with Ultra-Low IQ and Integrated Active EMI Filter datasheet (Rev. A)	PDF \| HTML	2023/1/24
	應用說明	Power Supply Designs for eBike That Meet the New GB42295 National Standard		2025/7/10
	應用說明	Controller to Converter – Design Considerations for 24V and 48V Systems	PDF \| HTML	2024/10/2
	應用說明	How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck	PDF \| HTML	2023/8/16
	功能安全資訊	LM5149 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA	PDF \| HTML	2022/12/16
	電子書	An Engineer’s Guide to Low EMI in DC/DC Regulators		2021/4/21

設計與開發

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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 I_Q。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。