LM1770SMFX

• Input voltage range of 2.8V to 5.5V
• 0.8V reference voltage
• Precision enablement
• Any claims for compensation
• Constant frequency in the input range
• Low quiescent current of 400μA
• Internal soft start
• Short-circuit protection
• Small LLP-6 package and MSOP-8 package

illustrate

The LM1771 is a highly efficient synchronous buck switching controller with precision activation without the need for external compensation. The constant on-time control scheme provides a simple design of compensation components that minimize component count and board space. The precision enable pin allows flexibility for multiple Rails sequencing and setting UVLOs. The LM1771 also uses a unique input feed-forward independent input voltage to maintain a constant frequency. The LM1771 is optimized for a low voltage input range of 2.8V to 5.5V and provides adjustable outputs as low as 0.8V. Driving external high-side PFET and low-side nFETs, it can provide up to 95% high efficiency.

Three versions of the LM1771 can be switched at the required frequency depending on the application. The switching frequency is specified in the range of 100kHz to 1000kHz.

apply

• Simple design, high efficiency boost switching regulator
• FPGA, DSP and ASIC power supplies
• Stb
• Cable modem
• printer
• Digital video recorder
• server
• Graphics