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MIC2179 Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MIC2179 Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 16 page MIC2179 Micrel MIC2179 2 June 1998 Pin Description Pin Number Pin Name Pin Function 1, 2, 19, 20 PGND Power Ground: Connect all pins to central ground point. 3 SW Switch (Output): Internal power MOSFET output switches. 5 PWM PWM/Skip-Mode Control (Input): Logic-level input. Controls regulator operating mode. Logic low enables PWM mode. Logic high enables skip mode. Do not allow pin to float. 6 PWRGD Error Flag (Output): Open-drain output. Active low when FB input is 10% below the reference voltage (V REF). 7 FB Feedback (Input): Connect to output voltage divider resistors. 8 COMP Compensation: Output of internal error amplifier. Connect capacitor or series RC network to compensate the regulator control loop. 9–12 SGND Signal Ground: Connect all pins to ground, PGND. 13 SYNC Frequency Synchronization (Input): Optional. Connect an external clock signal to synchronize the oscillator. Leading edge of signal above 1.7V terminates switching cycle. Connect to SGND if not used. 14 BIAS Internal 3.3V Bias Supply: Decouple with 0.01 µF bypass capacitor to SGND. Do not apply any external load. 15 EN Enable (Input): Logic high enables operation. Logic low shuts down regulator. Do not allow pin to float. 16, 17 VIN Supply Voltage (Input): Requires bypass capacitor to PGND. Both pins must be connected to V IN. 4, 18 NC not internally connected. Pin Configuration 2 PGND 3 SW 4 NC 5 PWRGD 6 PWM 7 FB 1 PGND 8 COMP 9 SGND PGND 20 PGND 19 NC 18 VIN 17 VIN 16 EN 15 10 SGND 14 13 12 11 SGND SGND SYNC BIAS 20-Lead Wide SSOP Ordering Information Part Number Voltage Temperature Range Package MIC2179BSM Adjustable –40 °C to +85°C 20-lead SSOP MIC2179-3.3BSM 3.3V –40 °C to +85°C 20-lead SSOP MIC2179-5.0BSM 5.0V –40 °C to +85°C 20-lead SSOP |
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