LMQ62440-Q1中文资料汽车类 3V 至 36V、4A、低噪声固定频率同步降压转换器数据手册TI规格书

描述 Description

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.

特性 Features

• AEC-Q100 qualified for automotive applications
• Functional Safety-Capable
• Optimized for ultra-low EMI requirements
• Hotrod™ package minimizes switch node ringing
• Parallel input path minimizes parasitic inductance
• Adjustable switch node rise time
• Designed for rugged Automotive applications
• 0.4-V dropout with 4-A load (typical)
• High efficiency power conversion at all loads
• 90% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
• RDS_ON_HS = 41 mΩ (typical)
• External bias option for improved efficiency
• LM62440-Q1 (36 V, 4 A)