LM1771SMMX

• Input voltage range from 2.8V to 5.5V
• 0.8V reference
• Precision enablement
• Any claim for compensation
• Constant frequency in the input range
• The low quiescent current is 400μA
• Internal soft start
• Short-circuit protection
• Small LLP-6 and MSOP-8 packages

illustrate

The LM1771 is a highly efficient synchronous step-down switching controller with precision activation without external compensation. The constant on-time control plan provides a simple compensating component design that allows for a minimum number of components and board space. The precision enable pins allow for multiple Rails sequencing and the flexibility of setting up UVLOs. The LM1771 also features a unique input feed-forward independent input voltage that maintains a constant frequency. The LM1771 has an optimized input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high-side PFET and a low-side nFET, it can provide high efficiency up to 95%.

Three versions of the LM1771 are available depending on the frequency required by the application. Rated switching frequency ranges from 100kHz to 1000kHz.

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• Simple design, high-efficiency boost switching regulator
• FPGAs, DSPs, and ASIC power supplies
• Stb
• Cable modem
• printer
• Digital Video Recorder
• server
• Graphics