General Description

The HT77XX series is a set of PFM step-up DC/DC con verter 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, 2.2V, 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, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V

• Output current up to 100mA

• Ultra low supply current IDD2: 4μA (Typ.)

• Low ripple and low noise

• Low shutdown current: 0.5μA (Typ.)

• TO92, SOT89, SOT23 and SOT23-5 package

Applications

• Palmtops/PDAs

• Portable communicators/Smartphones

• Cameras/Camcorders

• Battery-powered equipment