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MIC2177BWM Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MIC2177BWM Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 16 page MIC2177 Micrel MIC2177 2 April 1999 Ordering Information Part Output Switching Temperature Number Voltage Frequency Range Package MIC2177-3.3BWM 3.3V 200kHz –40 °C to +85°C 20-lead wide SOP MIC2177-5.0BWM 5.0V 200kHz –40 °C to +85°C 20-lead wide SOP MIC2177BWM adj. 200kHz –40 °C to +85°C 20-lead wide SOP Pin Description Pin Number Pin Name Pin Function 1, 2, 9 VIN Supply Input: Controller and switch supply. Unregulated supply input to internal regulator, output switches, and control circuitry. Requires bypass capacitor to PGND. All three pins must be connected to V IN. 3,8 SW Switch (Output): Internal power MOSFET switch output. Both pins must be externally connected together. 4,5,6,7 PGND Power Ground: Output stage ground connections. Connect all pins to a common ground plane. 10 OUT Output Voltage Sense (Input): Senses output voltage to determine minimum switch current for PWM operation. Connect directly to V OUT. 11 AUTO Automatic Mode: Connect 2.2nF timing capacitor for automatic PWM-/skip- mode switching. Regulator operates exclusively in PWM mode when pin is pulled low. 12 FB Feedback (Input): Error amplifier inverting input. For adjustable output version, connect FB to external resistive divider to set output voltage. For 3.3V and 5V fixed output versions, connect FB directly to output. 13 COMP Compensation: Internal error amplifier output. Connect to capacitor or series RC network to compensate the regulator control loop. 14,15,16,17 SGND Signal Ground: Ground connection of control section. Connect all pins to common ground plane. 18 SYNC Frequency Synchronization (Input): Optional clock input. Connect to external clock signal to synchronize oscillator. Leading edge of signal above 1.7V terminates switching cycle. Connect to SGND if not used. 19 BIAS Bias Supply: Internal 3.3V bias supply output. Decouple with 0.01 µF bypass capacitor to SGND. Do not apply any external load. 20 EN Enable (Input): Logic high enables operation. Logic low shuts down regulator. Do not allow pin to float. Pin Configuration 2 VIN 3 SW 4 PGND 5 PGND 6 PGND 7 PGND 1 VIN 8 SW 9 VIN EN 20 BIAS 19 SYNC 18 SGND 17 SGND 16 SGND 15 10 OUT 14 13 12 11 AUTO FB COMP SGND 20-Lead Wide SOP |
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