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DC/DC 轉換器

LM61440

現行

3V 至 36V、4A、低雜訊同步降壓轉換器

立即訂購
產品規格表

LM61440

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 4 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000007 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
Rating Catalog Topology Buck Iout (max) (A) 4 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000007 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
VQFN-HR (RJR) 14 14 mm² (4 mm × 3.5 mm)
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Parallel input path minimizes parasitic inductance
    • Adjustable SW node rise time
  • Designed for reliable and rugged applications
    • Supports 42-V transients
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN
    • 0.3-V dropout with 3-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • Low MOSFET ON resistance
      • RDS_ON_HS = 41 mΩ (typical)
      • RDS_ON_LS = 21 mΩ (typical)
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
    • Pin compatible with:
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Parallel input path minimizes parasitic inductance
    • Adjustable SW node rise time
  • Designed for reliable and rugged applications
    • Supports 42-V transients
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN
    • 0.3-V dropout with 3-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • Low MOSFET ON resistance
      • RDS_ON_HS = 41 mΩ (typical)
      • RDS_ON_LS = 21 mΩ (typical)
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
    • Pin compatible with:

The LM61440 is a high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The LM61440 implements soft recovery from dropout eliminating overshoot on the output.

The LM61440 is specifically designed for minimal EMI. The device incorporates adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be set or synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.

The LM61440 is a high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; tolerant of 42 V, easing input surge protection design. The LM61440 implements soft recovery from dropout eliminating overshoot on the output.

The LM61440 is specifically designed for minimal EMI. The device incorporates adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be set or synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.
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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 LM61440 3-V to 36-V, 4-A, Low EMI Synchronous Step-Down Converter datasheet (Rev. C) PDF | HTML 2021/6/22
選擇指南 Buck Converter Quick Reference Guide (Rev. B) 2021/4/8
功能安全資訊 LM61x0 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 2020/10/8

設計與開發

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開發板

LM61460EVM — 36-V、低 EMI 6-A、5-V 同步、400-kHz、降壓轉換器評估模組

LM61460 評估模組 (EVM) 是完全組裝且經過測試的電路，用於評估 LM61460 同步降壓轉換器。  LM61460 在小型解決方案尺寸中提供卓越的效率、低 IQ 和低 EMI。
使用指南: PDF | HTML
支援產品和硬體
模擬型號

LM61440AAN PSpice Transient Model

SNVMBY8.ZIP (142 KB) - PSpice 模型
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模擬型號

LM61440AAN-Q1 PSpice Transient Model

SNVMBZ0.ZIP (142 KB) - PSpice 模型
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計算工具

SNVR479 — LM61460 Design Tool

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
VQFN-HR (RJR) 14 Ultra Librarian
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