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MCP1612T-ADJIMF Datasheet(PDF) 9 Page - Microchip Technology |
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MCP1612T-ADJIMF Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 22 page  © 2005 Microchip Technology Inc. DS21921B-page 9 MCP1612 3.0 MCP1612 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Input Voltage Pin (VIN) Connect the input voltage source to VIN. For normal operation, the voltage on VIN should be between +2.7V and +5.5V. A 10 µF bypass capacitor should be connected between VIN and PGND. 3.2 Analog Input Voltage Pin (VCC) VCC provides bias for internal analog functions. This voltage is derived by filtering the VIN supply. 3.3 Shutdown Input Pin (SHDN) Connect SHDN to a logic-level input in order to turn the regulator on or off. A logic-high (>45% of VIN) will enable the regulator. A logic-low (<15% of VIN) will force the regulator into Shutdown mode. When in shutdown, both the P-channel and N-channel switches are turned off. 3.4 Compensation Pin (COMP) COMP is the internal transconductance amplifier output pin. External compensation is connected to COMP for control-loop stabilization. 3.5 Feedback Pin (FB) Connect the output voltage of the buck converter through an external resistor divider to FB to regulate the output voltage. The nominal voltage compared to this input for pulse termination is 0.8V. 3.6 Analog Ground Pin (AGND) Tie all small-signal ground returns to AGND. Noise on AGND can effect the sensitive internal analog measurements. 3.7 Power Ground Pin (PGND) Connect all large-signal ground returns to PGND. These large-signal traces should have a small loop area and length to prevent coupling of switching noise to sensitive traces. 3.8 Buck Inductor Output Pin (LX) Connect LX directly to the buck inductor. This pin carries large signal-level currents; all connections should be made as short as possible. Pin No. Name Function 1VIN Input Voltage Pin 2VCC Analog Input Voltage Pin 3 SHDN Shutdown Control Input Pin 4 COMP Transconductance Amplifier Output Pin 5 FB Feedback Input Pin 6AGND Analog Ground Pin 7PGND Power Ground Pin 8LX Buck Inductor Output Pin |
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Similar Description - MCP1612T-ADJIMF |
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