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MIC5190 Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC5190 Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 13 page MIC5190 Micrel April, 2004 6 M9999-042804 Functional Diagram Figure 1. MIC5190 Block Diagram Functional Description VIN The VIN pin is connected to the N-Channel drain. VIN is the input power being supplied to the output. This pin is also used to power the internal current limit comparator and compare the ISENSE voltage for current limit. The voltage range is from 0.9V min to 5.5V max. ISENSE The ISENSE pin is the other input to the current limit com- parator. The output current is limited when the ISENSE pin's voltage is 50mV less than the VIN pin. In cases where there is a current limited source and there isn’t a need for current limit, this pin can be tied directly to VIN. Its operating voltage range, like the VIN pin, is 0.9V min to 5.5V max. VCC1, VCC2 VCC1 supplies the error amplifier and internal reference, while VCC2 supplies the output gate drive. For this reason, ensure these pins have good input capacitor bypassing for better performance. The operating range is from 4.5V to 13.2V and both VCC pins should be tied together. Ensure that the voltage supplied is greater than a gate-source threshold above the output voltage for the N-Channel MOSFET se- lected. Output The output drives the external N-Channel MOSFET and is powered from V CC. The output can sink and source over 150mA of current to drive either an N-Channel MOSFET or an external NPN transistor. The output drive also has short circuit current protection. Enable The MIC5190 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a low off-mode- current state. Forcing the enable pin high enables the output voltage. The enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. FB The feedback pin is used to sense the output voltage for regulation. The feedback pin is compared to an internal 0.5V reference and the output adjusts the gate voltage accordingly to maintain regulation. Since the feedback biasing current is typically 13 µA, smaller feedback resistors should be used to minimize output voltage error. COMP COMP is the external compensation pin. This allows com- plete control over the loop to allow stability for any type of output capacitor, load currents and output voltage. A detailed explanation of how to compensate the MIC5190 is in the “Designing with the MIC5190” section. SGND, PGND SGND is the internal signal ground which provides an iso- lated ground path from the high current output driver. The signal ground provides the grounding for noise sensitive circuits such as the current limit comparator, error amplifier and the internal reference voltage. PGND is the power ground and is the grounding path for the output driver. OUTPUT CONTROL AND LEVEL SHIFT CURRENT LIMIT AMPLIFIER ERROR AMPLIFIER ENABLE VIN IS VCC2 OUT PGND FB 0.5V 50mV SGND EN VCC1 COMP INTERNAL VOLTAGE REGULATOR |
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