Description

The SC122 is a high efficiency, low noise, synchronous step-up DC-DC converter. It produces a fixed 3.3V output from a single cell alkaline or NiMH battery. It features an internal 1.2A switch and synchronous rectifier to achieve high efficiency and to eliminate the need for an external Schottky diode.

Features

■ Input voltage — 0.7V to 1.6V

■ Minimum start-up voltage — 0.85V

■ Output voltage fixed at 3.3V

■ Peak input current limit — 350mA typically

■ Output current 95mA at VIN = 1.6V, 50mA at VIN = 0.9V

■ Efficiency up to 80%

■ Internal synchronous rectifier

■ Switching frequency — 1.2MHz

■ Power save (voltage hysteretic) control

■ Anti-ringing circuit

■ Operating supply current (measured at OUT) — 40μA

■ No forward conduction path during shutdown

■ MLPD-UT-6 1.5 × 2.0 × 0.6 (mm) package

■ Lead-free and halogen-free

■ WEEE and RoHS compliant

Applications

■ Electric toothbrushes

■ Personal medical products

■ Single-cell alkaline, NiCd, or NiMH applications