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MIC2003-0.5YM5 Datasheet(PDF) 21 Page - Micrel Semiconductor |
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MIC2003-0.5YM5 Datasheet(HTML) 21 Page - Micrel Semiconductor |
21 / 30 page Micrel, Inc. MIC20xx Family August 2011 21 M9999-080211-D Functional Description VIN and VOUT VIN is both the power supply connection for the internal circuitry driving the switch and the input (Source connection) of the power MOSFET switch. VOUT is the Drain connection of the power MOSFET and supplies power to the load. In a typical circuit, current flows from VIN to VOUT toward the load. Since the switch is bi- directional when enabled, if VOUT is greater than VIN, current will flow from VOUT to VIN. When the switch is disabled, current will not flow to the load, except for a small unavoidable leakage current of a few microamps. However, should VOUT exceed VIN by more than a diode drop (~0.6 V), while the switch is disabled, current will flow from output to input via the power MOSFET’s body diode. If discharging CLOAD is required by your application, consider using MIC20X4 or MIC20X7; these MIC20XX family members are equipped with a discharge FET to insure complete discharge of CLOAD. Current Sensing and Limiting MIC20XX protects the system power supply and load from damage by continuously monitoring current through the on-chip power MOSFET. Load current is monitored by means of a current mirror in parallel with the power MOSFET switch. Current limiting is invoked when the load exceeds the set over-current threshold. When current limiting is activated the output current is constrained to the limit value, and remains at this level until either the load/fault is removed, the load’s current requirement drops below the limiting value, or the switch goes into thermal shutdown. Kickstart™ 2003 2004 2005X 2006 2007 2008 2009X 2013 2014 2015 2016 2017 2018 2019X Only parts in bold have Kickstart™. (Not available in 5-pin SOT-23 packages) The MIC201X is designed to allow momentary current surges (Kickstart™) before the onset of current limiting, which permits dynamic loads, such as small disk drives or portable printers to draw the energy needed to overcome inertial loads without sacrificing system safety. In this respect, the Kickstart™ parts (MIC201X) differs markedly from the non-Kickstart™ parts (MIC200X) which immediately limit load current, potentially starving the motor and causing the appliance to stall or stutter. During this delay period, typically 128ms, a secondary current limit is in effect. If the load demands a current in excess the secondary limit, MIC201X acts immediately to restrict output current to the secondary limit for the duration of the Kickstart™ period. After this time the MIC201X reverts to its normal current limit. An example of Kickstart™ operation is shown in Figure 3. Figure 3. Kickstart™ Operation Figure 3 Label Key: A. MIC201X is enabled into an excessive load (slew rate limiting not visible at this time scale) The initial current surge is limited by either the overall circuit resistance and power supply compliance, or the secondary current limit, whichever is less. B. RON of the power FET increases due to internal heating (effect exaggerated for emphasis). C. Kickstart™ period. D. Current limiting initiated. FAULT/ goes LOW. E. VOUT is non-zero (load is heavy, but not a dead short where VOUT = 0V. Limiting response will be the same for dead shorts). F. Thermal shutdown followed by thermal cycling. G. Excessive load released, normal load remains. MIC201X drops out of current limiting. H. FAULT/ delay period followed by FAULT/ going HIGH. Undervoltage Lock-Out Undervoltage lock-out insures no anomalous operation occurs before the device’s minimum input voltage of UVLOTHRESHOLD which is 2V minimum, 2.25V typical, and 2.5V maximum had been achieved. Prior to reaching this voltage, the output switch (power MOSFET) is OFF and no circuit functions, such as FAULT/ or ENABLE, are considered to be valid or operative. |
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