TC105 Datasheet | Microchip Technology

Features - 57A (Typ) Supply Current - 1A Output Current - 0.5A Shutdown Mode - 300k Hz Switching Frequency for Small Inductor Size - Programmable Soft-Start - 92% Typical Efficiency - Small Package: 5-Pin SOT-23A Applications - Palmtops - Battery-Operated Systems - Portable Instruments - Positive LCD Bias Generators - Portable municators - Hand-Held Scanners - 5V to 3V Down Converters Device Selection Table Part Number Output Voltage (V)- Package Osc. Freq. (k Hz) Operating Temp. Range TC105503ECT 5.0 5-Pin SOT-23A 300 -40C to +85C TC105333ECT 3.3 5-Pin SOT-23A 300 -40C to +85C TC105303ECT 3.0 5-Pin SOT-23A 300 -40C to +85C - Other output voltages are available. Please contact Microchip Technology Inc. for details. Package Type 5-Pin SOT-23A VOUT 5 SHDN 4 1 EXT VDD GND NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A General Description The TC105 is a step-down (Buck) switching controller that furnishes output currents of up to 1A (max) while delivering a typical efficiency of 92%. The TC105 normally operates in pulse width modulation mode (PWM), but automatically switches to pulse frequency modulation (PFM) at low output loads for greater efficiency. Oscillator frequency is 300k Hz, allowing use of small (22H) inductors. Supply current draw is only 102A (max), and is reduced to less than 0.5A when the SHDN input is brought low. Regulator operation is suspended during shutdown. The TC105 accepts a maximum input voltage of 10V. The TC105 is available in a small 5-Pin SOT-23A package, occupies minimum board space and is ideal for a wide range of applications. Functional Block Diagram D1...