ML4770

The ML4770 is a continuous conduction mode boost regulator designed for DC to DC conversion in multiple cell battery power systems. Continuous conduction allows the regulator to maximize output current for a given inductor. The maximum switching frequency can exceed 200kHz, allowing the use of small, low cost inductors. The ML4770 is capable of start-up with input voltages as low as 1.8V. The output voltage can be set anywhere between 3.0V and 5.5V by an external resistor divider connected to the SENSE pin.

An integrated synchronous rectifier ML4770 eliminates the need for an external Schottky diode and provides a lower forward voltage drop, resulting in higher conversion efficiency. In addition, low quiescent current and variable frequency operation result in high efficiency even at light loads. The ML4770 requires only a few external components to build a very small regulator capable of achieving conversion efficiencies approaching 85%.

The SHDN input of ML4770 allows the user to stop the regulator fromswitching, and provides complete isolation of the load from the battery.