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RT9277APF Datasheet(PDF) 5 Page - Richtek Technology Corporation |
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RT9277APF Datasheet(HTML) 5 Page - Richtek Technology Corporation |
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5 / 12 page  RT9277A/B Preliminary 5 DS9277A/B-02 March 2007 www.richtek.com Absolute Maximum Ratings (Note 1) Supply Voltage (VIN) -------------------------------------------------------------------------------------------------- −0.3 to 6V LX to GND --------------------------------------------------------------------------------------------------------------- − 0.3V to 16V The other pins ---------------------------------------------------------------------------------------------------------- − 0.3V to 6V Power Dissipation, PD @ TA = 70 °C MSOP-8 ----------------------------------------------------------------------------------------------------------------- 625mW Package Thermal Resistance (Note 4) MSOP-8, θJA------------------------------------------------------------------------------------------------------------ 160°C/W Junction Temperature ------------------------------------------------------------------------------------------------- 150 °C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260 °C Storage Temperature Range ---------------------------------------------------------------------------------------- − 65°C to 150°C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V Electrical Characteristics (VIN = 3V, FREQ left floating, TA = 25 °C, Unless Otherwise specification) Recommended Operating Conditions (Note 3) Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C Parameter Symbol Test Condition Min Typ Max Units System Supply Input Operation voltage Range VIN 2.5 -- 5.5 V Under Voltage Lock Out UVLO 1.9 2 2.1 V Power On Reset Hysteresis -- 100 -- mV VFB = 1.3V, No switching -- 250 350 μA Quiescent Current IQ VFB = 1.0V, Switching, No load -- 2 5 mA Shut Down Current ISHDN EN = GND -- -- 1 μA Soft start Current (RT9277B) ISS VSS = 1.2V 1.5 4 7 μA Switching Regulator Oscillator FREQ = GND 540 640 740 kHz Free Run Frequency fOSC FREQ = VIN -- 1200 -- kHz Maximum Duty Cycle 82 90 96 % Reference Voltage Feedback Reference Voltage VREF VCOMP = 1.24V 1.222 1.24 1.258 V Error Amplifier Transconductance Gm 70 140 240 μΩ Voltage Gain AV -- 700 -- V/V To be continued |
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