Shenzhen Meiyuxin Technology Co., Ltd. [supply integrated circuits] sells LM5149QRGYRQ1 80V automotive synchronous step-down DC/DC controller with ultra-low IQ and integrated active EMI filter Quality assurance! ! !

Product Description:

The LM5149QRGYRQ1 is an 80V ultralow IQ synchronous step-down DC/DC controller for high current single output applications. The controller uses a peak current mode control architecture for simple loop compensation, fast transient response, and excellent load and line regulation. The LM5149-Q1 can be programmed to operate in dual-phase mode for precise current sharing for high current applications. The device can operate from VIN as low as 3.5V and near 100% duty cycle if required.

The LM5149QRGYRQ1 has two unique EMI reduction features: an active EMI filter and dual random spread spectrum (DRSS). Active EMI filters detect any noise or ripple voltage on the DC input bus and inject out-of-phase cancellation signals to reduce interference. DRSS combines low-frequency triangular modulation with high-frequency random modulation to reduce EMI in the low-frequency and high-frequency bands, respectively. This hybrid technology complies with various resolution bandwidth (RBW) settings specified in industry-standard EMC tests.

Additional features of the LM5149QRGYRQ1 include 150°C maximum operating junction temperature, user-selectable diode emulation for reduced current consumption at light loads, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic Start-up to pre-biased load, integrated VCC bias supply regulator and bootstrap diode, 3ms internal soft-start time and thermal shutdown protection with auto-recovery.

Features:

• AEC-Q100 Qualified for Automotive Applications:

– Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range

• Functional safety

– Documentation to aid in functional safety system design

• Two Integrated EMI Mitigation Mechanisms

– Active EMI filter for improved EMI performance at low frequencies

– Optional Dual Random Spread Spectrum (DRSS) for enhanced EMI reduction performance on low and high frequency bands

– 25dBµV average reduction in EMI

– Reduces External Differential Mode Input Filter Size by 50% and Lowers System Cost

• Versatile Synchronous Buck DC/DC Controller

– Wide Input Voltage Range from 3.5V to 80V

– 1% Accurate, Fixed 3.3V/5V/12V or 0.8V to 55V Adjustable Output Voltage

– 150°C maximum junction temperature

– Shutdown Mode Current: 2.3µA

– No-load sleep current: 9.5 µA

– Up to two phases can be stacked

• Switching Frequency from 100kHz to 2.2MHz

– Sync In and Sync Out functions

• Inherent protection features for robust design

– Internal hiccup mode overcurrent protection

– Enable and PGOOD functions

– VCC, VDDA and gate drive UVLO protection

– Thermal Shutdown Protection with Hysteresis

Application

• Automotive electronic systems

• Infotainment system, instrument cluster, ADAS

• Body electronics

• High voltage battery powered system