Texas Instruments LM25149-Q1

Description

The LM25149-Q1 is a 42-V synchronous buck DC/DC controller for high-current single-output applications. Refer to the Errata. The device uses peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25149-Q1 can be set up in interleaved mode (paralleled output) with accurate current sharing for high-current applications. The LM25149-Q1 can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed. The LM25149-Q1 has two unique EMI reduction features: active EMI filter and Dual Random Spread Spectrum (DRSS). Active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the noise or ripple voltage. DRSS combines a low-frequency triangular and high-frequency random modulation to optimize EMI preformance in the low-frequency and high-frequency radio frequency bands.

Features

• AEC-Q100 qualified for automotive applications:– Device temperature grade 1: –40°C to +125°Cambient operating temperature
• Two integrated EMI mitigation mechanisms– Active EMI filter for enhanced EMI performance at lower frequencies– Dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands– EMI reduced by an average of 25 dBµV– Reduces the external differential-mode filter size by 50% and lowers systems cost
• Versatile synchronous buck DC/DC controller– Wide input voltage range of 3.5 V to 42 V– 1% accurate, fixed 3.3-V, 5-V, 12-V, oradjustable outputs from 0.8 V to 36 V– 150°C maximum junction temperature– Shutdown mode current: 2.2 µA– No-load standby current: 9 µA
• Switching frequency from 100 kHz to 2.2 MHz– SYNC in and SYNC out capability
• Inherent protection features for robust design– Internal hiccup-mode overcurrent protection– ENABLE and PGOOD functions– VCC, VDDA, and gate-drive UVLO protection– Internal or external loop compensation– Thermal shutdown protection with hysteresis
• Create a custom design using the LM25149-Q1 with WEBENCH® Power Designer

Typical applications

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

More information

• Datasheet