General Description
The HT77XX series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 1.8V, 2.7V, 3.0V, 3.3V, 3.7V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells.

FEATUREs
• Low start-up voltage: 0.7V (Typ.), 0.9V (Max.)
• High efficiency: 85% (Typ.), VOUT ≥ 2.7V
• High output voltage accuracy: ±2.5%
• Output voltage: 1.8V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V
• Ultra low supply current IDD2: 4μA (Typ.)
• Low ripple and low noise
• Low shutdown current: 0.5μA (Typ.)
• TO-92, SOT-89, SOT-23 and SOT-25 package

APPLICATIONs
• Palmtops/PDAs
• Portable communicators/Smartphones
• Cameras/Camcorders
• Battery-powered equipment