LM5163QDDARQ1

1 Features

• AEC-Q100-qualified for automotive applications

– Device temperature grade 1: –40°C to +125°C, ambient temperature range

• Designed for reliable and rugged applications

– Wide input voltage range of 6 V to 100 V – Junction temperature range: –40°C to +150°C – Fixed 3-ms internal soft-start timer

– Peak and valley current-limit protection

– Input UVLO and thermal shutdown protection

• Suited for scalable automotive power supplies

– Low minimum on- and off-times of 50 ns

– Adjustable switching frequency up to 1 MHz

– Diode emulation for high light-load efficiency

– 10.5-µA no-load input quiescent current

– 3-µA shutdown quiescent current

– Optimized for CISPR 25 EMI standard

• Integration reduces solution size and cost

– COT mode control architecture

– Integrated 0.725-Ω NFET buck switch supports wide duty cycle range

– Integrated 0.34-Ω NFET synchronous rectifier eliminates external Schottky diode

– 1.2-V internal voltage reference

– No loop compensation components

– Internal VCC bias regulator and boot diode

• Create a custom design using WEBENCH® power designer

2 Applications

• Automotive 48-V mild hybrid ECU bias supplies

• Automotive DC/DC converters

• Automotive HVAC compressors and PTC heaters

3 Description

The LM5163-Q1 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. A minimum controllable on-time of 50 ns facilitates large step-down conversion ratios, enabling the direct step-down from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5163-Q1 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for highperformance 48-V battery automotive applications and MHEV/EV systems.

With integrated high-side and low-side power MOSFETs, the LM5163-Q1 delivers up to 0.5-A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. Additional features of the LM5163-Q1 include ultra-low IQ and diode emulation mode operation for high light-load efficiency, innovative peak and valley overcurrent protection, integrated VCC bias supply and bootstrap diode, precision

enable and input UVLO, and thermal shutdown protection with automatic recovery. An open-drain PGOOD indicator provides sequencing, fault reporting, and output voltage monitoring.

The LM5163-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 8-pin SO PowerPAD™ package. Its 1.27-mm pin pitch provides adequate spacing for high-voltage applications.

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