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MIC3172BN Datasheet(PDF) 3 Page - Micrel Semiconductor |
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MIC3172BN Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 20 page Micrel MIC2172/3172 April 2006 3 M9999-041806 (408) 955-1690 Pin Description Pin Number Pin Name Pin Function 1 S 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. 3 FB 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 VIN to enable the regulator. Apply TTL low or connect to ground to disable the regulator. Device draws only leakage current (<1µA) when disabled. 5 VIN Supply Voltage: 3.0V to 40V 6 P GND 2 Power Ground #2: One of two NPN power switch emitters with 0.3 Ω current sense resistor in series. Required. Connect to external inductor or input voltage ground depending on circuit topology. 7 VSW Power Switch Collector: Collector of NPN switch. Connect to external inductor or input voltage depending on circuit topology. 8 P GND 1 Power Ground #1: One of two NPN power switch emitters with 0.3 Ω 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. |
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