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6 page 
RT9248A Preliminary 6 DS9248A-06 March 2006 www.richtek.com Absolute Maximum Ratings (Note 1) Supply Voltage, VCC ------------------------------------------------------------------------------------------- 7V Input, Output or I/O Voltage ---------------------------------------------------------------------------------- GND -0.3V to V CC+0.3V Package Thermal Resistance TSSOP-28, θJA -------------------------------------------------------------------------------------------------- 45°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 Recommended Operating Conditions (Note 3) Supply Voltage, VCC ------------------------------------------------------------------------------------------- 5V ± 10% Ambient Temperature Range --------------------------------------------------------------------------------- 0 °C to 70°C Junction Temperature Range --------------------------------------------------------------------------------- 0 °C to 125°C Electrical Characteristics To be continued Parameter Symbol Test Conditions Min Typ Max Units VCC Supply Current Nominal Supply Current ICC PWM 1,2,3 Open -- 12 -- mA Power-On Reset POR Threshold VCCRTH VCC Rising 4.0 4.2 4.5 V Hysteresis VCCHYS 0.2 0.5 -- V Trip (Low to High) VDVDTP Enable 0.9 1.0 1.1 V VDVD Threshold Hysteresis VDVDHYS -- 70 -- mV Oscillator Free Running Frequency fOSC RRT = 12kΩ 170 200 230 kHz Frequency Adjustable Range fOSC_ADJ 50 -- 400 kHz Ramp Amplitude ΔV OSC RRT = 12kΩ -- 1.9 -- V Ramp Valley VRV -- 1.0 -- V Maximum On-Time of Each Channel 62 66 75 % RT Pin Voltage VRT RRT = 12kΩ 0.94 1.0 1.06 V Reference and DAC VRD10, VDAC ≥ 1V −1 -- +1 % DACOUT Voltage Accuracy ΔV DAC_10 VRD10, VDAC < 1V −10 -- +10 mV DACOUT Voltage Accuracy ΔV DAC_9 VRM9 −1 -- +1 % (VCC = 5V, TA = 25°C, unless otherwise specified) |
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