LM1770SMF

• The input voltage range is 2.8V to 5.5V
• 0.8V reference voltage
• Claim any compensation
• Constant frequency in the input range
• Low quiescent current 400μA
• Internal soft start
• Short-circuit protection
• Miniature SOT - 23 package

illustrate

The LM1770 is a high-efficiency synchronous buck switching controller in a tiny SOT23 package. The fixed on-time control scheme design provides a simple free compensatory component to minimize the number of components and board space. It also employs a unique input feedforward to maintain a constant frequency independent of the input voltage. The optimized LM1770 has a low-voltage input range of 2.8V to 5.5V and provides an adjustable output as low as 0.8V. Drive the external high-voltage side and low-pressure side NFET PFET, which can provide efficiencies of up to 95%.

Three versions of the LM1770 are available for different switching frequencies as required by the application. The rated switching frequency ranges from 100kHz to 1000kHz.

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• Simple design, high efficiency boost of switching regulators
• Stb
• Cable modem
• printer
• Digital Video Recorder
• server