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MCP1700T-2502ETO Datasheet(PDF) 11 Page - Microchip Technology |
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MCP1700T-2502ETO Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 24 page  © 2007 Microchip Technology Inc. DS21826B-page 11 MCP1700 4.0 DETAILED DESCRIPTION 4.1 Output Regulation A portion of the LDO output voltage is fed back to the internal error amplifier and compared with the precision internal bandgap reference. The error amplifier output will adjust the amount of current that flows through the P-Channel pass transistor, thus regulating the output voltage to the desired value. Any changes in input voltage or output current will cause the error amplifier to respond and adjust the output voltage to the target voltage (refer to Figure 4-1). 4.2 Overcurrent The MCP1700 internal circuitry monitors the amount of current flowing through the P-Channel pass transistor. In the event of a short-circuit or excessive output current, the MCP1700 will turn off the P-Channel device for a short period, after which the LDO will attempt to restart. If the excessive current remains, the cycle will repeat itself. 4.3 Overtemperature The internal power dissipation within the LDO is a function of input-to-output voltage differential and load current. If the power dissipation within the LDO is excessive, the internal junction temperature will rise above the typical shutdown threshold of 140°C. At that point, the LDO will shut down and begin to cool to the typical turn-on junction temperature of 130°C. If the power dissipation is low enough, the device will continue to cool and operate normally. If the power dissipation remains high, the thermal shutdown protection circuitry will again turn off the LDO, protecting it from catastrophic failure. FIGURE 4-1: Block Diagram. + - MCP1700 VIN VOUT GND +VIN Error Amplifier Voltage Reference Overcurrent Overtemperature |
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