Tem ommercial Extended C 70˚C to C 0˚ -2 ment dheld Equip an H e bl ta or for P
G FEATURIN ge perature Ran
July 2000
...
Tem ommercial Extended C 70˚C to C 0˚ -2 ment dheld Equip an H e bl ta or for P
G FEATURIN ge perature Ran
July 2000
ML4872
High Current Boost
Regulator with Shutdown
GENERAL DESCRIPTION
The ML4872 is a continuous conduction boost
regulator designed for DC to DC conversion in multiple cell battery powered 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 ML4872 is capable of start-up with input voltages as low as 1.8V and is available in 5V and 3.3V output versions with an output voltage accuracy of ±3%. An integrated synchronous rectifier 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 ML4872 requires only one inductor and two capacitors to build a very small
regulator circuit capable of achieving conversion efficiencies approaching 90%. The SHDN input allows the user to stop the
regulator from switching and powers down the control circuitry.
FEATURES
s
Guaranteed full load start-up and operation at 1.8V Input Continuous conduction mode for high output current Very low supply current (20µA output referenced) for micropower operation Pulse frequency modulation and internal synchronous rectification for high ...