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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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RT7253A 데이터시트(PDF) 4 Page - Richtek Technology Corporation |
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RT7253A 데이터시트(HTML) 4 Page - Richtek Technology Corporation |
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4 / 14 page  RT7253A 4 DS7253A-02 March 2011 www.richtek.com Electrical Characteristics (VIN = 12V, TA = 25 °C, unless otherwise specified) Absolute Maximum Ratings (Note 1) Supply Voltage, VIN ------------------------------------------------------------------------------------------------- −0.3V to 18.7V Input Voltage, SW --------------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V) VBOOT - VSW ----------------------------------------------------------------------------------------------------------- −0.3V to 6V Other Pin Voltages ------------------------------------------------------------------------------------------------- −0.3V to 6V Power Dissipation, PD @ TA = 25 °C SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 1.333W Package Thermal Resistance (Note 2) SOP-8 (Exposed Pad), θJA ---------------------------------------------------------------------------------------- 75°C/W SOP-8 (Exposed Pad), θJC --------------------------------------------------------------------------------------- 15°C/W Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260 °C Junction Temperature ----------------------------------------------------------------------------------------------- 150 °C Storage Temperature Range -------------------------------------------------------------------------------------- −65°C to 150°C ESD Susceptibility (Note 3) HBM (Human Body Mode) ---------------------------------------------------------------------------------------- 2kV MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V Recommended Operating Conditions (Note 4) Supply Voltage, VIN ------------------------------------------------------------------------------------------------- 4.5V to 17V Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 85°C Parameter Symbol Test Conditions Min Typ Max Unit Shutdown Supply Current VEN = 0V -- 0.5 3 μA Supply Current VEN = 3 V, VFB = 0.9V -- 0.8 1.2 mA Feedback Voltage VFB 4.5V ≤ VIN ≤ 17V 0.788 0.8 0.812 V Error Amplifier Transconductance GEA ΔI C = ± 10μA -- 940 -- μA/V High Side Switch On-Resistance RDS(ON)1 -- 120 -- m Ω Low Side Switch On-Resistance RDS(ON)2 -- 120 -- m Ω High Side Switch Leakage Current VEN = 0V, VSW = 0V -- 0 10 μA Upper Switch Current Limit Min. Duty Cycle, VBOOT−VSW = 4.8V -- 5.1 -- A Lower Switch Current Limit From Drain to Source -- 1.3 -- A COMP to Current Sense Transconductance GCS -- 4.7 -- A/V Oscillation Frequency fOSC1 300 340 380 kHz Short Circuit Oscillation Frequency fOSC2 VFB = 0V -- 100 -- kHz Maximum Duty Cycle DMAX VFB = 0.7V -- 93 -- % Minimum On Time tON -- 100 -- ns To be continued |
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