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The LM63440AASQRYFRQ1 is an automotive-grade synchronous DC/DC buck converter with excellent efficiency and ultra-low IQ, featuring integrated high-side and low-side MOSFETs capable of delivering up to 6A of output current over a wide input voltage range of 3V to 36V, supporting load-dropout transients up to 42V. The converter provides soft recovery from voltage drops, eliminating the need to overshoot the output.

LM63440AASQRYFRQ1: Automotive-Grade 3V to 36V, 4A Low EMI Synchronous Buck Converter with Pin-Adjustable Switching Frequency 

Model Number: LM63440AASQRYFRQ1 

Package: VQFN-FCRLF-22 

Type: Synchronous Buck Converter 

The LM63440AASQRYFRQ1 integrates a number of features for excellent EMI performance, including spread spectrum rate modulation, a low EMI-enhanced HotRod QFN package that mitigates switching node ringing, and a symmetrical pin arrangement for ideal input capacitor placement. The switching frequency is settable between 200kHz and 2.2MHz to avoid sensitive bands, while efficiency or design size can be optimised according to application requirements.

LM63440AASQRYFRQ1 - Product Features: 

Multi-function Synchronous DC/DC Buck Converter 

- Wide input voltage range of 3V to 36V, withstanding sudden load drop transients up to 42V 

- 4A and 6A options available 

- 1% accuracy, adjustable output voltage (1V to 95% VIN) 

- 150°C maximum junction temperature - Uses 4A and 6A options. 150°C maximum junction temperature 

- Frequency adjustable from 200kHz to 2.2MHz with RT pin or SYNC signal 

Improved reliability through optimised pin arrangement design and adjacent pin short circuit test gaps 

Designed to meet low EMI requirements 

- Enhanced HotRod™ QFN package with dual input paths reduces switching node ringing 

- Spread Spectrum Frequency Modulation 

- Selection of FPWM or PFM at light loads Selectable FPWM or PFM modes 

High efficiency across the entire load range 

- 92.5% at 13.5V VIN, 5V VOUT, 6A, 2.1MHz 

- 7µA typical at 3.3VOUT no-load input current 

- 0.6µA typical shutdown quiescent current 

- Typical dropout at full load of 0.6V 

- External bias options available to improve efficiency

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