TC115
PFM/PWM Step-Up DC/DC Converter
Features Package Type
SOT-89-5 High Efficiency at Low Output Load Currents via
PFM Mode Assured Start-up at 0.9V 80 ВµA (Typ) Supply Current 85% Typical Efficiency at 100 mA 140 mA Typical Output Current @ VIN пЂЅ 2.0V Low Power Shutdown Mode No External Switching Transistor Needed Space-Saving SOT-89 Package PS
5 4 GND LX
TC115 NC PS 1 2 SHDN
3 Applications General Description The TC115 is a high-efficiency step-up DC/DC
converter for small, low input voltage or batterypowered systems. This device has a start-up voltage
of 0.9V and a typical supply current of 80 ВµA. Phase
compensation and soft-start circuitry are included onchip. Unlike conventional PWM step-up converters,
the TC115 automatically shifts to pulse frequency
modulation (PFM) at low loads, resulting in reduced
supply current and improved efficiency. Pagers
Cellular Phones
Palmtops
1-Cell to 3-Cell Battery Powered Systems
Cameras, Video Recorders
Local +3V to +5V Supplies The TC115 requires only an external diode, an inductor
and a capacitor, while supporting typical output currents of 140 mA. Supply current is reduced to less than
0.5 ВµA (max) when SHDN input is brought low.
Small size, low installed cost and low supply current
make the TC115 step-up converter ideal for use in a …
