The MAX1765EEE+ is an 800mA, low-noise, step-up DC to DC converter with 500mA linear regulator in 16 pin QSOP package. It operates at a high 1MHz fixed frequency while maintaining an exceptionally low quiescent supply current (200μA). Its small external components and tiny package. The MAX1765 uses a synchronous-rectified pulse width modulation boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single lithium-ion cell. It significantly improves efficiency at low load currents while automatically transitioning to fixed-frequency PWM operation at medium to high load currents to maintain excellent full-load efficiency. Forced-PWM mode is available for applications that require constant-frequency operation at all load currents and the MAX1765 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.
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