Datasheet TC55 (Microchip) - 9

link to page 9
TC55 3.0 PIN DESCRIPTIONS 4.0 DETAILED DESCRIPTION
The descriptions of the pins are listed in Table 3-1. The TC55 is a low quiescent current, precision, fixed- output voltage LDO. Unlike bipolar regulators, the
TABLE 3-1: PIN FUNCTION TABLE
TC55 supply current does not increase proportionally with load current.
Pin No. Symbol Description
1 GND Ground Terminal
4.1 Output Capacitor
2 VOUT Regulated Voltage Output A minimum of 1 µF output capacitor is required. The 3 V output capacitor should have an effective series resis- IN Unregulated Supply Input tance (esr) greater than 0.1Ω and less than 5Ω, plus a
3.1 Ground Terminal (GND)
resonant frequency above 1 MHz. Larger output capacitors can be used to improve supply noise rejec- Regulator ground. Tie GND to the negative side of the tion and transient response. Care should be taken output and the negative side of the input capacitor. when increasing COUT to ensure that the input imped- Only the LDO bias current (1 µA typical) flows out of ance is not high enough to cause high input impedance this pin, there is no high current. The LDO output regu- oscillation. lation is referenced to this pin. Minimize voltage drops between this pin and the minus side of the load.
4.2 Input Capacitor 3.2 Regulated Voltage Output (V
A 1 µF input capacitor is recommended for most
OUT)
applications when the input impedance is on the order Connect VOUT to the positive side of the load and the of 10Ω. Larger input capacitance may be required for positive terminal of the output capacitor. The positive stability when operating off of a battery input, or if there side of the output capacitor should be physically is a large distance from the input source to the LDO. located as close to the LDO VOUT pin as is practical. When large values of output capacitance are used, the The current flowing out of this pin is equal to the DC input capacitance should be increased to prevent high load current. source impedance oscillations.
3.3 Unregulated Supply Input (VIN)
Connect the input supply voltage and the positive side of the input capacitor to VIN. The input capacitor should be physically located as close as is practical to VIN. The current flow into this pin is equal to the DC load current, plus the LDO bias current (1 µA typical.) © 2005 Microchip Technology Inc. DS21435F-page 9 Document Outline 1.0 Electrical Characteristics 2.0 Typical Performance Curves FIGURE 2-1: Output Voltage vs. Output Current (TC55RP3002). FIGURE 2-2: Output Voltage vs. Input Voltage (TC55RP3002). FIGURE 2-3: Output Voltage vs. Input Voltage (TC55RP3002). FIGURE 2-4: Dropout Voltage vs. Output Current (TC55RP3002). FIGURE 2-5: Output Voltage vs. Operating Temperature (TC55RP3002). FIGURE 2-6: Supply Current vs. Input Voltage (TC55RP3002). FIGURE 2-7: Supply Current vs. Operating Temperature (TC55RP3002). FIGURE 2-8: Load Transient Response (TC55RP3002). FIGURE 2-9: Output Voltage vs. Output Current (TC55RP5002). FIGURE 2-10: Output Voltage vs. Input Voltage (TC55RP5002). FIGURE 2-11: Output Voltage vs. Input Voltage (TC55RP5002). FIGURE 2-12: Dropout Voltage vs. Output Current (TC55RP5002). FIGURE 2-13: Output Voltage vs. Operating Temperature (TC55RP5002). FIGURE 2-14: Supply Current vs. Input Voltage (TC55RP5002). FIGURE 2-15: Supply Current vs. Operating Temperature (TC55RP5002). FIGURE 2-16: Input Transient Response, 1mA (TC55RP5002). FIGURE 2-17: Input Transient Response, 10mA (TC55RP5002). FIGURE 2-18: Load Transient Response (TC55RP5002). 3.0 Pin Descriptions TABLE 3-1: Pin Function Table 3.1 Ground Terminal (GND) 3.2 Regulated Voltage Output (VOUT) 3.3 Unregulated Supply Input (VIN) 4.0 Detailed Description 4.1 Output Capacitor 4.2 Input Capacitor 5.0 Thermal Considerations 5.1 Power Dissipation 6.0 Packaging Information 6.1 Package Marking Information Worldwide Sales and Service Trademarks Worldwide Sales