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MIC2230-GWYML Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MIC2230-GWYML Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 18 page  Micrel, Inc. MIC2230 April 2010 10 M9999-040810-C Functional Block Diagram Functional Description VIN VIN provides power to the MOSFETs for the switch mode regulator section, along with the current limiting sensing. Due to the high switching speeds, a 10µF capacitor is recommended close to VIN and the power ground (PGND) pin for bypassing. Please refer to layout recommendations. AVIN Analog VIN (AVIN) provides power to the analog supply circuitry. AVIN and VIN must be tied together. Careful layout should be considered to ensure high frequency switching noise caused by VIN is reduced before reaching AVIN. A 1µF capacitor as close to AVIN as possible is recommended. See layout recommendations for detail. EN1 Enable 1 controls the on and off state of regulator 1. A high logic on Enable 1 (EN1) activates regulator 1 while a low logic deactivates regulator 1. MIC2230 features built-in soft-start circuitry that reduces in-rush current and prevents the output voltage from overshooting at start up. EN2 Enable 2 controls the on and off state of regulator 2. A high logic on Enable 2 (EN2) activates regulator 2 while a low logic deactivates regulator 2. MIC2230 features built-in soft-start circuitry that reduces in-rush current and prevents the output voltage from overshooting at start up. /FPWM The Forced PWM Mode selects the mode of operation for this device. Grounding this pin forces the device to stay in constant frequency PWM mode only. Pulling this pin high enables automatic selection of Trickle or PWM mode operation, depending on the load. While /FPWM is high and the load is below 100mA, the device will go into Trickle Mode™. If the load is above 100mA, PWM mode will automatically be selected. Do not leave this pin floating. PGOOD The Power Good Output is pulled down unless the regulator 1 output voltage is within +6.25% or -8.5% of regulation. When the output voltage is in regulation, the PGOOD capacitor will be charged to AVIN by an internal 5 μA current source through a 1kΩ resistor. The charge |
Similar Part No. - MIC2230-GWYML |
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Similar Description - MIC2230-GWYML |
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