描述 Description

The LM5012 non-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 LM5012 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial applications.

With integrated high-side power MOSFET, the LM5012 delivers up to 2.5 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 LM5012 include ultra-low IQ and a innovative peak 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 LM5012 is available in a 8-pin SO PowerPAD? integrated circuit package. The device 1.27-mm pin pitch provides adequate spacing for high-voltage applications.

特性 Features

? Designed for reliable and rugged applications
? Wide input voltage range of 6 V to 100 V
? –40°C to +125°C junction temperature range
? Fixed 3-ms internal soft-start timer
? Peak current-limit protection
? Input UVLO and thermal shutdown protection

? Functional Safety-Capable
? Documentation available to aid functional safety system design

? Optimized for ultra-low EMI requirements
? Meets CISPR 25 Class 5 standard

? Suited for scalable industrial power supplies
? Pin-to-pin compatible with the LM5163 and LM5164 (100 V, 0.5 A or 1 A), and LM5013-Q1 (100 V, 3.5A)
? 50-ns low minimum on and off times
? Diode emulation for high light-load efficiency
? 10-μA no-load sleep current
? 3.1-μA shutdown quiescent current

? Integration reduces solution size and cost
? COT mode control architecture
? Integrated 100-V 0.25-Ω power MOSFET
? 1.2-V internal voltage reference
? No loop compensation components
? Internal VCC bias regulator and boot diode

? Create a custom regulator design using WEBENCH Power Designer