Texas Instruments LM5140RHA | Demoboard snva748

Description

The LM5140-Q1 is a dual synchronous buckcontroller intended for high voltage wide VIN stepdownconverter applications. The control method isbased on current mode control. Current mode controlprovides inherent line feed-forward, cycle-by-cyclecurrent limiting, and easier loop compensation.The LM5140-Q1 features adjustable slew rate controlto simplify compliance with the CISPR andautomotive EMI requirements. The LM5140-Q1operates at selectable switching frequencies of 2.2MHz or 440 kHz with the two controller channelsswitching 180º out of phase. In light or no-loadconditions, the LM5140-Q1 operates in skip cyclemode for improved low power efficiency. TheLM5140-Q1 includes a high voltage bias regulatorwith automatic switch-over to an external bias supplyto improve efficiency and reduce input current.Additional features include frequency synchronization,cycle-by-cycle current limit, hiccup mode faultprotection for sustained overloads, independentpower good outputs, and independent enable inputs.

Features

AEC-Q100 Grade 1 Qualified(TA = -40ºC to 125ºC)

• Input Operating Range from 3.8 V to 65 V (70 VAbsolute Maximum)
• Two Interleaved Buck Controllers with:– VOUT1 Fixed 3.3 V, 5 V, or Adjustablefrom 1.5 V – 15 V, Accuracy ±1%– VOUT2 Fixed 5 V, 8 V, or Adjustablefrom 1.5 V – 15 V, Accuracy ±1%
• Fixed 2.2 MHz or 440 kHz Switching Frequency,Accuracy ±7%
• Optional Synchronization to an External Clock
• SYNC Output Clock for Additional Converters
• Shutdown Mode Current: 9 μA Typical
• No Load Standby Current: 35 μA Typical (OneChannel Operating)
• Current Limit Threshold Programmable to 50 mVor 75 mV, Accuracy ±10%
• Independent Enable Inputs for VOUT1 andVOUT2
• Hiccup Mode Protection for Sustained Overload
• Independent Power Good Outputs
• High-side and Low-side Gate Drivers withAdjustable Slew Rate Control
• Selectable Diode Emulation or ContinuousConduction at Light Load
• VQFN-40 Package with Wettable Flanks

Typical applications

• Instrument Clusters
• Infotainment Systems
• Advanced Driver Assistance (ADAS)
• Automotive Electronics

More information

• Datasheet
• IC product information