LMQ62440CPPQRJRRQ1

LMQ62440-Q1 is a high-performance DC/DC synchronous buck converter with integrated bypass capacitors. The device features integrated high-side and low-side MOSFETs, capable of delivering up to 4A output current over a wide input voltage range of 3.0V to 36V; it withstands 42V and supports load dump events of 400 ms duration. The device performs soft recovery on the voltage differential, eliminating output overshoot. The device is specifically designed to reduce EMI. It features pseudo-random spread spectrum, integrated bypass capacitors, adjustable SW node rise time, and low EMI, housed in a VQFN-HR package with low switching node ringing and optimized pin layout for ease of use. Switching frequency can be synchronized from 200kHz to 2.2MHz to avoid noise-sensitive frequency bands. The frequency can also be selected to improve efficiency at lower operating frequencies or reduce solution size at higher operating frequencies. Auto mode enables frequency foldback during light-load operation, achieving a no-load quiescent current of only 7μA (typical) and high light-load efficiency. Seamless transitions between PWM and PFM modes, combined with ultra-low MOSFET on-resistance and an external bias input, ensure excellent efficiency across the full load range. The device is housed in a 14-pin VQFN-HR package with wettable flanks. Electrical characteristics are rated for a junction temperature range of –40°C to +150°C.

Applications

• Automotive infotainment systems and instrument clusters: head units, media hubs, USB chargers, displays
• Automotive ADAS and body electronics

Key features

• AEC-Q100 qualified for automotive applications, temperature grade 1: -40°C to +150°C, TJ
• Functional Safety documentation available to support functional safety system design
• Optimized for ultra-low EMI requirements
• CISPR25 Class 5 compliant
• Hotrod package minimizes switching node ringing
• Internal bypass capacitor reduces EMI
• Parallel input paths minimize parasitic inductance
• Spread spectrum reduces peak emissions
• Adjustable switching node rise time
• Designed for demanding automotive applications
• 42V load dump support
• 0.4V dropout voltage at 4A load (typical)
• High-efficiency power conversion across all loads
• 7μA no-load quiescent current at 13.5VIN, 3.3VOUT
• 90% PFM efficiency at 1mA, 13.5VIN, 5VOUT
• Low MOSFET on-resistance
• RDS_ON_HS = 41mΩ (typical)
• RDS_ON_LS = 21mΩ (typical)
• External bias option for improved efficiency
• Pin-compatible with LM62440-Q1 (36V, 4A)