LM61440AASQRJRRQ1

The LM61440-Q1 is an automotive-grade, high-performance synchronous DC/DC buck converter. The device features integrated high-side and low-side MOSFETs, capable of delivering up to 4A of output current over a wide input voltage range of 3.0V to 36V, with 42V transient tolerance to simplify input inrush protection design. The LM61440-Q1 features soft recovery of voltage drop-out, eliminating output overshoot. The LM61440-Q1 is specifically designed to reduce EMI. The device features pseudo-random spread spectrum, adjustable SW node rise time, and low EMI, housed in a VQFN-HR package with low switching node ringing and an easy-to-use, optimized pin layout. The switching frequency can be set or synchronized in the range of 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 switching between PWM and PFM modes, combined with ultra-low MOSFET on-resistance and an external bias input, ensures excellent efficiency across the full load range. The LM61440-Q1 is AEC-Q100 Grade 1 qualified and housed in a 14-pin VQFN-HR package with wettable flanks. Electrical characteristics are rated over 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 compliant
• Temperature Grade 1: -40°C to 150°C, TJ
• Functional Safety capable
• Optimized for ultra-low EMI requirements
• HotRod package minimizes switching node ringing
• Parallel input paths minimize parasitic inductance
• Spread spectrum reduces peak emissions
• Adjustable SW node rise time
• Designed for automotive applications
• Supports 42V automotive load dump
• ±1% total output voltage regulation accuracy
• VOUT adjustable from 1V to 95% of VIN
• 0.3V dropout voltage at 3A load (typical)
• High-efficiency power conversion at all loads
• 7μA no-load quiescent current at 13.5VIN, 3.3VOUT
• 83% PFM efficiency at 1mA, 13.5VIN, 5VOUT
• External bias option for improved efficiency
• Scalable power supply compatible
• Pin-compatible with LM61460-Q1 (36V, 6A, adjustable fSW) and LM61435-Q1 (36V, 3.5A, adjustable fSW)