LM25149 42-V Synchronous Buck DC/DC Controller with Ultra-Low IQ and Integrated Active EMI Filter

1 Features

Functional Safety-Capable
- Documentation available to aid functional safety system design
Two integrated EMI mitigation mechanisms
- Active EMI Filter for enhanced EMI performance at lower frequencies
- Selectable 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 input filter size by 50% and lowers systems cost
- Optimized for CISPR 32 Class B requirements
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, or adjustable output from 0.8 V to 36 V
- 150°C maximum junction temperature
- Shutdown mode current: 2.3 µA
- No-load sleep current: 9.5 µA
- Stackable up to two phases
- Advanced dropout with frequency foldback
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 with WEBENCH® Power Designer