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MIC2159 Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MIC2159 Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 17 page Micrel MIC2159 October 2006 2 M9999-101206 Ordering Information Part Number Output Voltage Frequency Juction Temperature Range Package MIC2159YMME Adj 400KHz -40 °C to +125°C 10-lead ePAD MSOP Pin Configuration 10-lead e-PAD MSOP (MME) Pin Description Pin Number (MSOP-10) Pin Name Pin Function 1 VIN Supply voltage (Input): 3V to 14.5V 2 VDD 5V Internal Linear Regulator (Output): VDD is the external MOSFET gate drive supply voltage and an internal supply bus for the IC. When Vin is ≤5V, VDD should be connected to Vin. 3 CS Current Sense. Current-limit comparator non-inverting input. The current limit is sensed across the FET during the ON time. The current can be set by the resistor in series with the CS pin. 4 COMP/EN Compensation (Input): Dual function pin. Pin for external compensation. If this pin is pulled below 0.2V, with the reference fully up the device shuts down (50 µA typical current draw) 5 FB Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V. 6 GND Ground (Return) 7 LSD Low-Side Drive (Output): High-current driver output for external synchronous MOSFET. 8 VSW Switch (Return): High-side MOSFET driver return 9 HSD High-Side Drive (Output): High current output-driver for the high-side MOSFET. When Vin is below 5v, 2.5v threshold FETs should be used. At Vin > 5V, 4.5V threshold FETs should be used. 10 BST Boost (Input): Provides the drive voltage for the high-side MOSFET driver. The gate drive voltage is higher than the source voltage by VIN minus a diode drop. |
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