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MIC3838 Datasheet(PDF) 4 Page - Micrel Semiconductor |
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MIC3838 Datasheet(HTML) 4 Page - Micrel Semiconductor |
4 / 11 page MIC3838/3839 Micrel MIC3838/3839 4 April 2005 Electrical Characteristics (Note 5) TA = TJ = –40°C to +85°C, VDD=10V, Note 10,1µF capacitor from VDD to GND, R=22kΩ, C=330pF. Parameter Condition Min Typ Max Units Internal Reference Section Output voltage IOUT = 0mA 2.85 3.0 3.15 V Line Regulation MIC3838 9V ≤ VDD ≤12V 2 10 mV MIC3839 5V ≤ VDD ≤12V Load Regulation IOUT = 1mA 14 30 mV Oscillator Section Oscillator Frequency 180 200 220 kHz Oscillator Amplitude/VDD Note 6 0.44 0.5 0.56 V/VDD Error Amp Section Input Voltage COMP = 2V 1.95 2 2.05 V Input Bias Current –1 1 µA Open Loop Voltage Gain (Guaranteed by design) 60 80 dB COMP Sink Current FB = 2.2V, COMP = 1V 0.3 2.5 mA COMP Source Current FB = 1.3V, COMP = 3V, Note 7 –0.15 –0.5 mA COMP PM Clamp Voltage VFB = 0V 3.1 3.6 4.0 V PWM Section Maximum Duty Cycle Measured at OUTA or OUTB 48 49 50 % Minimum Duty Cycle COMP = 0V 0% Current Sense Section Gain Guaranteed by design, Note 8 1.9 2.2 2.5 V/V ILIM Maximum Input Signal Note 9 0.45 0.5 0.55 V ILIM to Output Delay COMP = 3V, ILIM from 0mV to 600mV 70 200 ns Ramp or ILIM Source Current –200 nA Ramp or ILIM Sink Current Ramp = ILIM = 0.5V, RC = 5.5V Note 10 510 mA ILIM Over Current Threshold 0.7 0.75 0.8 V COMP to Ramp Offset Ramp = ILIM = 0V 0.35 0.8 1.2 V Output Section OUT Low Level I = 100mA 0.5 1 V OUT High Level I = –50mA, VDD – OUT 0.5 1 V Rise Time CL = 1nF 25 60 ns Fall Time CL = 1nF 25 60 ns Absolute Maximum Rating (Note 1) Supply Voltage (IDD ≤10mA) ...................................... +15V Supply Current ........................................................... 20mA OUTA/OUTB Source Current (peak) ...................... –0.5A OUTA/OUTB Sink Current (peak) ............................ 1.0A COMP Pin .................................................................... VDD Analog Inputs (FB, ILIM, RAMP) ......... –0.3V to VDD +0.3V NOT TO EXCEED 6V Junction Temperature .............................. –55°C to +150°C Storage Temperature (TS) ....................... –65°C to +150°C Lead Temperature (soldering, 10 sec.) ................... +300°C ESD Rating, Note 3 ...................................................... 2kV Operating Ratings (Note 2) VDD Input Voltage (VDD) .......................................... Note 4 Oscillator Frequency (fOSC) ....................... 10kHz to 1MHz Ambient Temperature (TA) ......................... –40°C to +85°C Package Thermal Resistance MSOP-10 (θJA) ..................................................115°C/W |
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