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LM8850 evaluation board application note

Posted: 20 Jun 2011     Print Version  Bookmark and Share

Keywords:evaluation board  super-capacitor 

The LM8850 evaluation board is a working demonstration of a step-up DC-DC converter that has been optimised for use with a super-capacitor. The super-capacitor protects a battery from power surges and enables new high-power applications in mobile device architectures. The LM8850 creates a rail from 3.6V to 5.7V from an input voltage range of 2.3V to 5.5V, VIN must be 10% lower than expected VOUT.

An I2C interface controlling multiple output voltage settings, input current limits, and load currents up to 1A provides superior

user flexibility. The LM8850 operates in Auto mode, where the converter is in PFM mode at light loads and switches to PWM mode at heavy loads or in forced PWM mode. Hysteretic PFM extends the battery life by reducing the quiescent current to 7µA (typ.) during light load and standby conditions. Synchronous operation provides true shutdown isolation and improves the efficiency at medium to full load conditions.

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