The LMQ62440-Q1 is a high-performance, DC-DC synchronous buck converter with integrated bypass capacitors. 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; 42-V tolerance supports load dump for durations of 400 ms. The device implements soft recovery from dropout eliminating overshoot on the output.

The device is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, integrated bypass capacitors, 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 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.

The device is available in a 14-pin VQFN-HR package with wettable flanks. Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.

• AEC-Q100 qualified for automotive applications
  • Temperature grade 1: –40°C to +150°C, TJ
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Optimized for ultra-low EMI requirements
  • Meets CISPR25 class 5 standard
  • Hotrod? package minimizes switch node ringing
  • Internal bypass capacitors reduce EMI
  • Parallel input path minimizes parasitic inductance
  • Spread spectrum reduces peak emissions
  • Adjustable switch node rise time
• Designed for rugged Automotive applications
  • Supports 42-V load dump
  • 0.4-V dropout with 4-A load (typical)
• High efficiency power conversion at all loads
  • 7-μA no load current at 13.5 VIN, 3.3 VOUT
  • 90% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
  • Low MOSFET ON resistance
    • RDS_ON_HS = 41 m? (typical)
    • RDS_ON_LS = 21 m? (typical)
• External bias option for improved efficiency
• Pin compatible with:
  • LM62440-Q1 (36 V, 4A)

• Vin (Min) (V)
• 3
• Vin (Max) (V)
• 36
• Vout (Min) (V)
• 1
• Vout (Max) (V)
• 34
• Iout (Max) (A)
• 4
• Iq (Typ) (uA)
• 7
• Switching frequency (Min) (kHz)
• 2200
• Switching frequency (Max) (kHz)
• 2200
• Features
• Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable Flanks Package
• Rating
• Automotive
• Regulated outputs (#)
• 1
• Control mode
• Current Mode
• Duty cycle (Max) (%)
• 98

LMQ62440-Q1的完整型号有：LMQ62440APPQRJRRQ1、LMQ62440BPPQRJRRQ1、LMQ62440CPPQRJRRQ1，以下是这些产品的关键参数及官网采购报价：

LMQ62440APPQRJRRQ1，工作温度：-40 to 150，封装：VQFN-HR (RJR)-14，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：SN，TI官网LMQ62440APPQRJRRQ1的批量USD价格：1.841（1000+）

LMQ62440BPPQRJRRQ1，工作温度：-40 to 150，封装：VQFN-HR (RJR)-14，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：SN，TI官网LMQ62440BPPQRJRRQ1的批量USD价格：1.841（1000+）

LMQ62440CPPQRJRRQ1，工作温度：-40 to 150，封装：VQFN-HR (RJR)-14，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：SN，TI官网LMQ62440CPPQRJRRQ1的批量USD价格：1.841（1000+）

LMQ62440EVM — 36V 输入、低 EMI、4A/5V 输出、同步 2.1MHz 降压转换器评估模块

LMQ62440EVM 评估模块 (EVM) 是一款组装完备且经过测试的电路，用于评估 LMQ62440 同步降压转换器。LMQ62440 采用具有集成电容器的小尺寸解决方案，提供出色的效率、低 Iq 和低 EMI。

LMQ62440APP-Q1 PSpice Transient Model

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

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