Texas Instruments LM5143-Q1

Description

The LM5143-Q1 is a 65-V synchronous buck DC/DC controller for high-current single or dual outputs. The device uses an interleaved, stackable, current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on-time of 65 ns gives large step-down ratios, enabling the direct conversion from 12-V, 24-V, or 48-V automotive inputs to low-voltage rails for reduced system complexity and solution cost. The LM5143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

Features

• AEC-Q100 qualified for automotive applications:
• – Device temperature grade 1: –40°C to +125°C ambient operating temperature
• Versatile synchronous buck DC/DC controller
• – Wide input voltage range of 3.5 V to 65 V
• – 1% accurate, fixed 3.3-V, 5-V or adjustableoutputs from 0.6 V to 55 V
• – 150°C maximum junction temperature
• – Shutdown mode current: 4 µA typical
• – No-load standby current: 15 µA typical
• Two interleaved synchronous buck channels
• – Dual-channel or single-output multiphase
• – 65-ns tON(min) for high VIN/VOUT ratio
• – 60-ns tOFF(min) for low dropout
• Switching frequency from 100 kHz to 2.2 MHz
• – SYNC in and SYNC out capability
• Inherent protection features for robust design
• – Hiccup-mode overcurrent protection
• – Independent ENABLE and PGOOD functions
• – VCC, VDDA, and gate-drive UVLO protection
• – Thermal shutdown protection with hysteresis
• Optimized for ultra-low EMI requirements
• – Slew-rate controlled adaptive gate drivers
• – Spread spectrum reduces peak emissions
• – Meets CISPR 25 Class 5 standard
• VQFNP-40 package with wettable flank pins
• Create a custom design using the LM5143-Q1 with WEBENCH® Power Designer

Typical applications

• Automotive electronic systems
• High-voltage battery-operated systems
• Infotainment systems, instrument clusters, ADAS