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MCP1703A Datasheet(PDF) 11 Page - Microchip Technology |
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MCP1703A Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 30 page  © 2012 Microchip Technology Inc. DS25122A-page 11 MCP1703A 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. 3.1 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 (2.0 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. 3.2 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. 3.3 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, 1 µF of capacitance will ensure stable operation of the LDO circuit. For applications that have load currents below 100 mA, the input capacitance requirement can be lowered. 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. 3.4 Exposed Thermal Pad (EP) There is an internal electrical connection between the Exposed Thermal Pad (EP) and the VSS pin; they must be connected to the same potential on the Printed Circuit Board (PCB). TABLE 3-1: MCP1703A PIN FUNCTION TABLE 2x3 DFN SOT-223 SOT-23A SOT-89 Name Function 4 2,Tab 1 1 GND Ground Terminal 13 2 3 VOUT Regulated Voltage Output 81 3 2,Tab VIN Unregulated Supply Voltage 2, 3, 5, 6, 7 — — — NC No Connection 9 — — — EP Exposed Thermal Pad (EP); must be connected to VSS |
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