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TC1017-3.3VCT 데이터시트(PDF) 10 Page - Microchip Technology |
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TC1017-3.3VCT 데이터시트(HTML) 10 Page - Microchip Technology |
10 / 22 page TC1017 DS21813B-page 10 2003 Microchip Technology Inc. 4.0 DETAILED DESCRIPTION The TC1017 is a precision, fixed-output, linear voltage regulator. The internal linear pass element is a P-Channel MOSFET. As with all P-Channel CMOS LDOs, there is a body drain diode with the cathode connected to V IN and the anode connected to VOUT (Figure 4-1). As is shown in Figure 4-1, the output voltage of the LDO is sensed and divided down internally to reduce external component count. The internal error amplifier has a fixed bandgap reference on the inverting input and the sensed output voltage on the non-inverting input. The error amplifier output will pull the gate voltage down until the inputs of the error amplifier are equal to regulate the output voltage. By sensing the current in the P-Channel MOSFET, the maximum current delivered to the load is limited to a typical average value of 120 mA, preventing excessive current from damaging the printed circuit board in the event of a shorted or faulted load. An internal thermal sensing device is used to monitor the junction temperature of the LDO. When the sensed temperature is over the set threshold of 160°C (typical), the P-Channel MOSFET is turned off. When the P-Channel is off, the power dissipation internal to the device is almost zero. The device cools until the junction temperature is approximately 150°C and the P-Channel is turned on. If the internal power dissipation is still high enough for the junction to rise to 160°C, it will again shut off and cool. The maximum operating junction temperature of the device is 125°C. Steady- state operation at or near the 160°C overtemperature point can lead to permanent damage of the device. The output voltage V OUT remains stable over the entire input operating voltage range (2.7V to 6.0V) and the entire load range (0 mA to 150 mA). The output voltage is sensed through an internal resistor divider and compared with a precision internal voltage reference. Several fixed-output voltages are available by changing the value of the internal resistor divider. Figure 4-2 shows a typical application circuit. The regulator is enabled any time the shutdown input pin is at or above V IH. It is shut down (disabled) any time the shutdown input pin is below V IL. For applications where the SHDN feature is not used, tie the SHDN pin directly to the input supply voltage source. While in shutdown, the supply current decreases to 0.006 µA (typical) and the P-Channel MOSFET is turned off. As shown in Figure 4-2, batteries have internal source impedance. An input capacitor is used to lower the input impedance of the LDO. In some applications, high input impedance can cause the LDO to become unstable. Adding more input capacitance can compensate for this. FIGURE 4-1: TC1017 Block Diagram. FIGURE 4-2: Typical Application Circuit. + -EA V OUT V REF SHDN V IN 5 4 R1 R2 1 2 3 SHDN GND V IN NC Current Limit Over Error Feedback Resistors Control Temp. Body Diode Amp V OUT 5 4 1 2 3 SHDN GND V IN NC R SOURCE C IN 1µF Ceramic C OUT 1µF Ceramic TC1017 Load |
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