TC125

Obsolete Device TC125/TC126 PFM Step-Up DC/DC Regulators Features: Assured Start-up at 0.9V PFM (100 kHz Max. Operating Frequency) 40 μA Maximum Supply Current (VOUT = 3V @ 30 mA) 0.5 μA Shutdown Mode (TC125) Voltage Sense Input (TC126) Requires Only Three External Components 80 mA Maximum Output Current Small Package: 5-Pin SOT-23 Applications: Palmtops/PDAs Battery-Operated Systems Cameras Portable Communicators Device Selection Table Part Number Output Voltage (V)* Package Operating Temp. Range TC125501ECT 5.0 TC125331ECT 3.3 TC125301ECT 3.0 TC126501ECT 5.0 TC126331ECT 3.3 TC126301ECT 3.0 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 5-Pin SOT-23 -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C *Other output voltages are available. Please contact Microchip Technology Inc. for details. Package Type 5-Pin SOT-23 LX GND LX GND 5 4 5 4 General Description: The TC125/126 step-up (Boost) switching regulators furnish output currents to a maximum of 80 mA (VIN = 2V, VOUT = 3V) with typical efficiencies above 80%. These devices employ pulse frequency modulation (PFM) for minimum supply current at low loads. They are ideal for battery-operated applications powered from one or more cells. Maximum supply current is less than 70 μA at full output load, and less than 5 μA in standby (VOUT = 3V). Both devices require only an external inductor, diode, and capacitor to implement a compl...