MIC2033 Evaluation Board High-Accuracy, High-Side, Fixed Current Limit Power Switch General Description Getting Started The MIC2033 is a high-side MOSFET power distribution 1. Connect an external supply to the V terminal. IN switch providing increased system reliability using 5% Apply the desired input voltage to the V and ground IN current limit accuracy. terminals of the evaluation board, paying careful The MIC2033 has an operating input voltage range from attention to polarity and supply voltage. The user can 2.5V to 5.5V, is internally current limited, and has thermal place an ammeter between the input supply and the shutdown to protect the device and system. The MIC2033 V terminal to the evaluation board. Make sure that IN is offered with either active-high or active-low logic level the supply voltage is monitored at the V terminal. The IN enable input controls. It has an open drain fault status ammeter and/or power lead resistance can reduce the output flag with a built-in 32ms delay that asserts low voltage supplied to the input. during overcurrent or thermal shutdown conditions. 2. Connect the load to the V and ground terminals. OUT The MIC2033 is available with several different fixed The load can be either passive (resistive) or active (as current limit options: 0.5A, 0.8A, 1A, and 1.2A. A in an electronic load). The user can place an ammeter capacitor-adjustable soft-start circuit minimizes inrush between the load and the V terminal. Make sure OUT current in applications using high capacitive loads. that the output voltage is monitored at the V OUT The MIC2033 is offered in both 6-pin SOT-23 and 6-pin terminal. 2mm x 2mm thin DFN packages. It has an operating 3. Enable the switch junction temperature range of 40C to +125C. The MIC2033-12AYxx evaluation boards are Requirements configured for default enable using a 10k pull-up resistor from the ENABLE pin to VIN. To disable the The MIC2033 evaluation board requires a single power switch, place a jumper short across the jumper pins at supply to provide V . The V power supply must be able IN IN TP2. The MIC2033-05BYxx evaluation boards are to deliver a minimum of 2.5V and more than 1.5A configured for default disable. To enable the switch, capability. The output load can either be active or passive. place a jumper short across the jumper pins at TP2. Precautions 4. Fault detection The evaluation board does not have reverse polarity The MIC2033 is equipped with an error flag, FAULT/. protection. Applying a negative voltage to the V terminal IN TP3 is provided to monitor the FAULT/ pin. can damage the device. In addition, the maximum V IN operating voltage of the MIC2033 evaluation board is 5.5V. Exceeding 5.5V on V can permanently damage the IN Ordering Information device. Part Number Description Evaluation board featuring the MIC2033-05BYM6 EV MIC2033-05BYM6 500mA Switch Evaluation board featuring the MIC2033-12AYM6 EV MIC2033-12AYM6 1.2A Switch Evaluation board featuring the MIC2033-05BYMT EV MIC2033-05BYMT 500mA Switch Evaluation board featuring the MIC2033-12AYMT EV MIC2033-12AYMT 1.2A Switch Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2033 Evaluation Board Application Information Soft-Start Output Voltage Soft-start reduces the power supply input surge current The MIC2033 evaluation board is available with either a at startup by controlling the output voltage rise time. The 0.5A or 1.2A fixed current limit. If the output current input surge appears while the output capacitor is exceeds the current limit, the MIC2033 switch enters charged up. A slower output rise time draws a lower constant current limit mode. The maximum allowable input surge current. current limit can be less than the full specified and/or expected current if the MIC2033 is not mounted on a During soft-start, an internal current sink discharges the circuit board with sufficiently low thermal resistance. The external capacitor at CSLEW to ground to control the MIC2033 responds to short circuits within 10s to limit ramp of the output voltage. The output voltage rise time the output current. It also provides an output fault flag depends on the value of C , the input voltage, CSLEW that asserts (low) for an overcurrent condition that lasts output voltage, and the current limit. Micrel recommends longer than the overcurrent fault response delay time that the value of the CSLEW external capacitor be in the (t ), which is typically 32ms. FAULT/ range of 0.1F to 1F. For the MIC2033 evaluation board, CSLEW = C3 = 0.1F. September 2012 2 M9999-092812-A