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MIC24420YML Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MIC24420YML Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 34 page Micrel, Inc. MIC24420/MIC24421 June 2012 2 M9999-062012-C Ordering Information Part Number Voltage Switching Frequency Temperature Range Package Lead Finish MIC24420YML Adj 1MHz -40 °C to +125°C 24-Pin 4mm x 4mm MLF ® Pb-Free MIC24421YML Adj 500kHz -40 °C to +125°C 24-Pin 4mm x 4mm MLF ® Pb-Free Notes: 1. MLF ® is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. 2. MLF ® = Pin 1 identifier Pin Configuration 24-Pin 4mm x 4mm MLF (ML) Pin Description Pin Number Pin Name Pin Description 1 BST1 Boost 1 (Input): Provides voltage for high-side internal MOSFET for channel 1. Connect a 0.01µF capacitor from SW1 to BST1 pin and a diode to PVDD. 2 LSD1 Low-side Drive 1 (Output): External low-side N-Channel MOSFET driver. Use 4.5V rated MOSFETs. 3 PGND1 Power Ground 1 (Input). 4 CS1 Current Sense 1 (Input): Place a resistor from SW1 to this pin to program the current limit point from 0.5A to 2.7A. 5 PG1 Power Good 1 (Output): Open drain. Device is in the OFF state. i.e. high when output is within 90% of regulation. 6 EN/DLY1 Enable/Delay 1 (Input): This pin can be used to disable VOUT1. When used to disable VOUT1, this pin must be pulled down to ground in less than 1µs for proper operation. It is also used for soft- start of the output. Soft start capacitor range is 4.7nF to 22nF. See Functional Description section for additional information. 7 COMP1 Compensation 1 (Input): Pin for external compensation, Channel 1. 8 FB1 Feedback 1 (Input): Input to Ch1 error amplifier. Regulates to 0.7V. 9 AVDD 5V Internal Linear Regulator (Output): Connect to an external 4.7µF bypass capacitor. When VIN is <6V, this regulator operates in drop-out mode. Connect AVDD to VIN when VIN <6V. 10 AGND Analog Ground (Input): Control section ground. Connect to PGND. 11 FB2 Feedback 2 (Input): Input to Channel 2 error amplifier. Regulates to 0.7V. 12 COMP2 Compensation 2 (Input): Pin for external compensation, Channel 2. |
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