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MIC2172 Arkusz danych(PDF) 2 Page - Micrel Semiconductor |
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MIC2172 Arkusz danych(HTML) 2 Page - Micrel Semiconductor |
2 / 17 page MIC2172/3172 Micrel, Inc. M9999-042205 2 April 2005 Ordering Information Part Number Temperature Standard Pb-Free Range Package MIC2172BN MIC2172YN –40°C to +85°C 8-pin plastic DIP MIC2172BM MIC2172YM –40°C to +85°C 8-lead SOIC MIC3172BN MIC3172YN –40°C to +85°C 8-pin plastic DIP MIC3172BM MIC3172YM –40°C to +85°C 8-lead SOIC 8-lead SOIC (M) 1 2 3 4 S GND COMP P GND 1 FB *SYNC/†EN VSW VIN P GND 2 8 7 6 5 MIC2172*/3172† Pin Configuration 1 2 3 4 S GND COMP P GND 1 FB *SYNC/†EN VSW VIN P GND 2 8 7 6 5 MIC2172*/3172† Pin Description Pin Number Pin Name Pin Function 1S GND Signal Ground: Internal analog circuit ground. Connect directly to the input filter capacitor for proper operation (see applications info). Keep separate from power grounds. 2 COMP Frequency Compensation: Output of transconductance type error amplifier. Primary function is for loop stabilization. Can also be used for output voltage soft-start and current limit tailoring. 3FB Feedback: Inverting input of error amplifier. Connect to external resistive divider to set power supply output voltage. 4 (MIC2172) SYNC Synchronization/Frequency Adjust: Capacitively coupled input signal greater than device’s free running frequency (up to 135kHz) will lock device’s oscillator on falling edge. Oscillator frequency can be trimmed up to 135kHz by adding a resistor to ground. If unused, pin must float (no connection). 4 (MIC3172) EN Enable: Apply TTL high or connect to V IN to enable the regulator. Apply TTL low or connect to ground to disable the regulator. Device draws only leakage current (<1µA) when disabled. 5V IN Supply Voltage: 3.0V to 40V 6P GND 2 Power Ground #2: One of two NPN power switch emitters with 0.3Ω current sense resistor in series. Required. Connect to external inductor or input voltage ground depending on circuit topology. 7V SW Power Switch Collector: Collector of NPN switch. Connect to external inductor or input voltage depending on circuit topology. 8P GND 1 Power Ground #1: One of two NPN power switch emitters with 0.3Ω current sense resistor in series. Optional. For maximum power capability connect to P GND 2. Floating pin reduces current limit by a factor of two. 8-pin DIP (N) |
Podobny numer części - MIC2172_05 |
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Podobny opis - MIC2172_05 |
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