ML4875

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
V_OUT ........................................................................................ 7V
Voltage on any other pin .................. GND 0.3V to V_OUT + 0.3V
Peak Switch Current, I_(PEAK) ................................................ 1.5A
Average Switch Current, I_(AVG) ......................................... 300mA
Junction Temperature ........................................................ 150°C
Storage Temperature Range ............................ 65°C to 150°C
Lead Temperature (Soldering 10 sec.) ............................... 260°C
Thermal Resistance (_JA) Plastic SOIC ........................... 160°C/W

The ML4875 is a boost regulator designed for DC to DC conversion in 1 to 3 cell battery powered systems. The combination of BiCMOS process technology, internal synchronous rectification, variable frequency operation, and low supply current make the ML4875 ideal for 1 cell applications. The ML4875 is capable of start-up with input voltages as low as 1V and is available in 5V, 3.3V, and 3V output versions with an output voltage accuracy of ±3%.

Unlike regulators using external Schottky diodes, the ML4875 isolates the load from the battery when the SHDN pin is high. This is accomplished by an integrated synchronous rectifier which eliminates the need for an external Schottky diode and provides a lower forward voltage drop, resulting in higher conversion efficiency. In addition, low quiescent battery current and variable frequency operation result in high efficiency even at light loads. The ML4875 requires only one inductor and two capacitors to build a very small regulator circuit capable of achieving conversion efficiencies in excess of 90%.

The circuit of ML4875 contains a RESET output which goes low when the DETECT input drops below 200mV.