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TC105333ECT 데이터시트(PDF) 1 Page - Microchip Technology |
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TC105333ECT 데이터시트(HTML) 1 Page - Microchip Technology |
1 / 14 page 2001-2012 Microchip Technology Inc. DS21349C-page 1 TC105 Features •57 A (Typ) Supply Current • 1A Output Current •0.5 A Shutdown Mode • 300kHz 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 Communicators • Hand-Held Scanners • 5V to 3V Down Converters Device Selection Table *Other output voltages are available. Please contact Microchip Technology Inc. for details. Package Type 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 300kHz, allowing use of small (22 H) inductors. Supply current draw is only 102 A (max), and is reduced to less than 0.5A 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 Part Number Output Voltage (V)* Package Osc. Freq. (kHz) Operating Temp. Range TC105503ECT 5.0 5-Pin SOT-23A 300 -40 C to +85C TC105333ECT 3.3 5-Pin SOT-23A 300 -40 C to +85C TC105303ECT 3.0 5-Pin SOT-23A 300 -40 C to +85C TC105 1 23 5 4 VDD GND 5-Pin SOT-23A NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A VOUT SHDN EXT (From System Control Logic) 5 4 TC105333ECT 1 3 2 VDD EXT GND VOUT ON OFF SHDN 3.3V VOUT L1 22µH (Sumida CD54) D1 MA737 Si 9430 P VBATT 6V NiMH C1 10µF/16V RSS 470K CSS 0.033 µF C2 47 µF 10V Tantalum 3.3V Regulated Supply Using 6V NiMH Battery Pack Input + – PFM/PWM Step-Down DC/DC Controller |
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