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MCP1801T-3302I/OT bảng dữ liệu(PDF) 11 Page - Microchip Technology |
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MCP1801T-3302I/OT bảng dữ liệu(HTML) 11 Page - Microchip Technology |
11 / 26 page © 2009 Microchip Technology Inc. DS22051C-page 11 MCP1801 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: MCP1801 PIN FUNCTION TABLE 3.1 Unregulated Input Voltage (VIN) Connect VIN to the input unregulated source voltage. Like all low dropout linear regulators, low source impedance is necessary for the stable operation of the LDO. The amount of capacitance required to ensure low source impedance will depend on the proximity of the input source capacitors or battery type. For most applications, 0.1 µF of capacitance will ensure stable operation of the LDO circuit. The type of capacitor used can be ceramic, tantalum, or aluminum electrolytic. The low ESR characteristics of the ceramic will yield better noise and PSRR performance at high-frequency. 3.2 Ground Terminal (GND) Regulator ground. Tie GND to the negative side of the output and the negative side of the input capacitor. Only the LDO bias current (25 µA typical) flows out of this pin; there is no high current. The LDO output regulation is referenced to this pin. Minimize voltage drops between this pin and the negative side of the load. 3.3 Shutdown Input (SHDN) The SHDN input is used to turn the LDO output voltage on and off. When the SHDN input is at a logic-high level, the LDO output voltage is enabled. When the SHDN input is pulled to a logic-low level, the LDO output voltage is disabled and the LDO enters a low quiescent current shutdown state where the typical quiescent current is 0.01 µA. The SHDN pin does not have an internal pull-up or pull-down resistor. The SHDN pin must be connected to either VIN or GND to prevent the device from becoming unstable. 3.4 Regulated Output Voltage (VOUT) Connect VOUT to the positive side of the load and the positive terminal of the output capacitor. The positive side of the output capacitor should be physically located as close to the LDO VOUT pin as is practical. The current flowing out of this pin is equal to the DC load current. Pin No. SOT-23-5 Name Function 1VIN Unregulated Supply Voltage 2 GND Ground Terminal 3 SHDN Shutdown Input 4 NC No Connection 5VOUT Regulated Voltage Output |
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