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RT9261B42CX Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT9261B42CX Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 10 page  Preliminary RT9261B DS9261B-03 September 2001 www.richtek-ic.com.tw 3 Absolute Maximum Ratings Output Voltage 8V LX Pin Voltage 8V CE Pin Voltage (1) -0.3 to VOUT +0.3V LX Pin Output Current 400mA Power Dissipation, PD @ TA = 25 °C SOT-89 0.5W SOT-25 0.25W Package Thermal Resistance SOT-89, θJC 100 °C/W SOT-89, θJA 300 °C/W SOT-25, θJA 250 °C/W Operating Temperature Range -20 to +85 °C Storage Temperature Range -65 °C to 150°C Lead Temperature (Soldering, 10 sec.) 260 °C Notes: (1) Applicable to RT9261B-xxCB Electrical Characteristics (Refer to Fig. 1) Parameter Symbol Test Conditions Min Typ Max Units Output Voltage Accuracy ∆VOUT -2 -- +2 % Input Voltage VIN -- -- 7 V Start-up Voltage VST IOUT = 1mA, VIN: 0 → 2V -- 0.8 1 V Hold-on Voltage VHO IOUT = 1mA, VIN: 2 → 0V 0.7 -- -- V VOUT ≤ 3.5V (1) -- 24 36 Input Current 1 3.5V < VOUT ≤ 5V (2) To be measured at VIN in continuous switching -- 36 45 µA Input Current 2 (1) (2) To be measured at VOUT in switch off condition -- 6.5 10 µA VOUT ≤ 3.5V (1) -- 18 36 Input Current 3 3.5V < VOUT ≤ 5V (2) To be measured at VIN in no load (guaranteed by I1 and I2) -- 20 45 µA VOUT ≤ 3.5V (1) 120 -- -- LX Switching Current 3.5V < VOUT ≤ 5V (2) ISWITCHING VLX = 0.4V 160 -- -- mA LX Leakage Current ILEAKAGE VLX = 6V -- -- 0.5 µA Maximum Oscillator Frequency FMAX 140 190 240 KHz Oscillator Duty Cycle DOSC On (VLX “L”) side 65 75 85 % Efficiency -- 80 -- % VLX Voltage Limit LX switch on 0.65 0.8 1.0 V Notes: (1) VIN = 1.8V, VSS = 0V, IOUT = 1mA, Topt = 25 °C, and External Circuit of Typical Application (2) VIN = 3V, VSS = 0V, IOUT = 1mA, Topt = 25 °C, and External Circuit of Typical Application |
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