LM5163DDAR

1 Features

• 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 Industrial power supplies and battery packs

– 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

• Ultra–low EMI emission

– Optimized for CISPR 25 class 5 standard

• Integration reduces solution size and cost

– COT mode control architecture

– Integrated 0.725-Ω NFET buck switch

– 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

– Open-drain power good indicator

– 8-Pin SOIC package with PowerPAD™ 

• Create a custom regulator design using WEBENCH® power designer

2 Applications

• Industrial battery pack (≥10S)

• Battery pack – e-bike/e-scooter/LEV

• Motor drives, drones, communications equipment

3 Description

The LM5163 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 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for wide input supply range industrial and high cell count battery pack applications.

With integrated high-side and low-side power MOSFETs, the LM5163 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 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 is available in a thermally-enhanced, 8-pin SO PowerPAD™ package. Its 1.27-mm pin pitch provides adequate spacing for high-voltage applications.

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