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MIC2174 Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MIC2174 Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 27 page Micrel, Inc. MIC2174/MIC2174C September 2010 2 M9999-091310-C Ordering Information Part Number Voltage Accuracy Switching Frequency Junction Temperature Range Package Lead Finish MIC2174-1YMM Adj. ±1% 300kHz –40° to +125°C 10-Pin MSOP Pb-Free MIC2174C-1YMM Adj. ±3% 270kHz –40° to +125°C 10-Pin MSOP Pb-Free Pin Configuration 10-Pin MSOP (MM) Pin Description Pin Number Pin Name Pin Function 1 HSD High-Side N-MOSFET Drain Connection (input): Power to the drain of the external high-side N- channel MOSFET. The HSD operating voltage range is from 3V to 40V. Input capacitors between HSD and the power ground (PGND) are required. 2 EN Enable (input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high or floating = enable, logic low = shutdown. In the off state, supply current of the device is greatly reduced (typically 0.8mA). 3 FB Feedback (input): Input to the transconductance amplifier of the control loop. The FB pin is regulated to 0.8V. A resistor divider connecting the feedback to the output is used to adjust the desired output voltage. 4 GND Signal ground. GND is the ground path for the device input voltage VIN and the control circuitry. The loop for the signal ground should be separate from the power ground (PGND) loop. 5 IN Input Voltage (input): Power to the internal reference and control sections of the MIC2174/MIC2174C. The IN operating voltage range is from 3V to 5.5V. A 2.2µF ceramic capacitors from IN to GND are recommended for clean operation. VIN must be powered up no earlier than VHSD to make the soft-start function behavior correctly. 6 DL Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving voltage swings from ground to IN. 7 PGND Power Ground. PGND is the ground path for the MIC2174/MIC2174C buck converter power stage. The PGND pin connects to the sources of low-side N-Channel MOSFETs, the negative terminals of input capacitors, and the negative terminals of output capacitors. The loop for the power ground should be as small as possible and separate from the Signal ground (GND) loop. 8 DH High-Side Drive (output): High-current driver output for external high-side MOSFET. The DH driving voltage is floating on the switch node voltage (LX). It swings from ground to VIN minus the diode drop. Adding a small resistor between DH pin and the gate of the high-side N-channel MOSFETs can slow down the turn-on and turn-off time of the MOSFETs. |
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