MIC4043BM4 TR
MIC4043BM4 TR Datasheet
MIC4043
| Part | Datasheet |
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MIC4043BM4 TR |
MIC4043BM4 TR (pdf) |
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| MIC4043 Micrel MIC4043 Low-Voltage Secondary-Side Shunt Regulator Final Information The MIC4043 is a shunt regulator optimized for secondaryside regulation in low-voltage power supplies. Featuring an output stage guaranteed to swing within 400mV of ground, the MIC4043 can be used in power supplies operating down to 1.8V, even with optoisolators requiring greater than 1.2V of headroom. In power supply applications, the MIC4043 normally drives the LED of an optically isolated feedback circuit. The MIC4043 monitors a resistively-divided output voltage and sinks error current through the optoisolator’s LED secondary side the optoisolator’s transistor primary side provides this signal to the controller’s feedback input. The MIC4043 is also practical for other voltage-monitoring applications requiring an opencollector output. The MIC4043 replaces conventional ’431-type shunt regulators to allow low-voltage applications where there is inadequate headroom for a 2.5V regulator in series with an optoisolator. Replacing ’431-type devices requires only a minor change to the way that the resistive-divider values are calculated. • Ideal for 1.8V switching converters • Low-voltage operation 400mV maximum saturation over operating temperature range • Easy to use voltage in, current out • 2% voltage tolerance over operating temperature range • Optically isolated low-volage power supplies • Low-voltage discrete regulator control OPTICAL ISOLATION MIC4043 IN SNK GND FB MIC4043 Low-Side Feedback Control COMPENSATION VOUT R1 MIC38HC43BN 1 COMP VREF 8 VDD 7 3 ISNS VOUT 6 4 RT/CT GND 5 R2 Return VOUT 1.245V R2 R1 PRIMARY SIDE SECONDARY SIDE 200kHz DC-DC Flyback Converter Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 408 944-0800 • fax + 1 408 944-0970 • November 2000 MIC4043 MIC4043 Micrel Ordering Information Marking Voltage Tolerance Configuration MIC4043BM4 MIC4043YM4 RB1D 1.245V 1.245V Open Collector Open Collector Temperature Range to +85°C to +85°C Package SOT-143 SOT-143 Lead-Finish Leaded Pb-Free Pin Configuration RBxx MIC4043 Part Identification Pin Description Pin Number 1 2 3 4 Pin Name IN SNK GND FB Pin Function Input Supply voltage input. Sink Output NPN open collector output. Ground Feedback Input Feedback input from external voltage-divider network. Absolute Maximum Ratings Note 1 Input Voltage VIN +15V Output Voltage VSNK +15V Storage Temperature TS to +150°C ESD Rating, Note 3 human body model 2kV machine model 200V Operating Ratings Note 2 Input Voltage VIN +10V Output Voltage VSNK +10V Maximum Output Current ISNK 15mA Temperature Range TA to +85°C MIC4043 November 2000 MIC4043 Micrel Electrical Characteristics TA = 25°C, bold values indicate TA +85°C unless noted Parameter Condition Reference Voltage, Note 4 Reference Voltage Tolerance Supply Current Transconductance Output Transistor Saturation Voltage Output Leakage ISNK = 0mA 1mA < ISNK < 15mA ISNK = 15mA VSNK = 5V, output transistor off Min Typ Max Units |
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