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MCP1252 データシート(PDF) 8 Page - Microchip Technology |
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MCP1252 データシート(HTML) 8 Page - Microchip Technology |
8 / 20 page ![]() MCP1252/3 DS20001752C-page 8 2002-2014 Microchip Technology Inc. 3.0 PIN FUNCTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Open-Drain Power Good Output (PGOOD) PGOOD is a high-impedance when the output voltage is in regulation. A logic-low is asserted when the output falls 7% (typical) below the nominal value. The PGOOD output remains low until VOUT is within 3% (typical) of its nominal value. On start-up, this pin indicates when the output voltage reaches its final value. PGOOD is high-impedance when SHDN is low. 3.2 Regulated Output Voltage (VOUT) Bypass to GND with a filter capacitor. 3.3 Power Supply Input (VIN) It is recommended that VIN be tied to a ceramic bypass capacitor. 3.4 Ground (GND) It is recommended that the ground pin be tied to a ground plane for best performance. 3.5 Flying Capacitor Negative Terminal (C-) The charge pump capacitor (flying capacitor) is used to transfer charge from the input supply to the regulated output. It is recommended that a low ESR (equivalent series resistance) capacitor be used. 3.6 Flying Capacitor Positive Terminal (C+) The charge pump capacitor (flying capacitor) is used to transfer charge from the input supply to the regulated output. Proper orientation is imperative when using a polarized capacitor. 3.7 Shutdown Input (SHDN) A logic-low signal applied to SHDN disables the device. A logic-high signal applied to this pin allows normal operation. 3.8 Select (SELECT) Input or Feedback (FB) Input MCP1252-33X50, MCP1253-33X50: SELECT: Select Input Pin. Connect SELECT to VIN for 3.3V fixed output. Connect SELECT to GND for a 5.0V fixed output. MCP1252-ADJ, MCP1253-ADJ: FB: Feedback Pin. A resistor divider connected to this pin determines the adjustable VOUT value (1.5V to 5.5V). Pin No. Name Function 1 PGOOD Open-Drain Power GOOD Output 2VOUT Regulated Output Voltage 3VIN Power Supply Input 4 GND Ground Terminal 5 C- Flying Capacitor Negative Terminal 6 C+ Flying Capacitor Positive Terminal 7 SHDN Shutdown Mode, Active-Low Input 8 SELECT Output Voltage Select Pin (MCP1252-33X50, MCP1253-33X50) FB Feedback Input Pin for Adjustable Output (MCP1252-ADJ, MCP1253-ADJ) |
同様の部品番号 - MCP1252_14 |
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同様の説明 - MCP1252_14 |
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