General Description

The TS1909 is a high efficiency VFM Step-up DC/DC converter for small, low input voltage or battery powered systems with ultra low quiescent supply current. The TS1909 accept a positive input voltage from start-up voltage to VOUT and convert it to a higher output voltage in the 2.5 to 5V range.

The TS1909 combine ultra low quiescent supply current and high efficiency to give maximum battery life. The high switching frequency and the internally limited peak inductor current permits the use of small, low cost inductors. Only three external components are needed an inductor a diode and an output capacitor. The TS1909 is suitable to be used in battery powered equipment where low noise, low ripple and ultra low supply current are required.

Typical applications are pagers, cameras & video camera, cellular telephones, wireless telephones, palmtop computer, battery backup supplies, battery powered equipment.

Features

● Very Low Supply Current 22µA (Typ.)

● Maximum shutdown current <1µA

● Output Voltage Accuracy ±2.5

● Output Current up to 100mA

● Low Ripple and Low Noise

● Very Low Start-up Voltage

● High Efficiency Typ. 87 @ VOUT=5V

● Few External Components