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TC2054 データシート(PDF) 4 Page - Microchip Technology |
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TC2054 データシート(HTML) 4 Page - Microchip Technology |
4 / 16 page TC2054/2055/2186 DS21663B-page 4 © 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC2054, TC2055 and TC2186 are precision fixed output voltage regulators. (If an adjustable version is desired, please see the TC1070, TC1071 or TC1187 data sheets.) Unlike bipolar regulators, the TC2054, TC2055 and TC2186 supply current does not increase with load current. In addition, V OUT remains stable and within regulation over the entire 0mA to maximum out- put current operating load range. Figure 3-1 shows a typical application circuit. The reg- ulator is enabled any time the shutdown input (SHDN) is at or above VIH, and shutdown (disabled) when SHDN is at or below VIL. SHDN maybecontrolled bya CMOS logic gate, or I/O port of a microcontroller. If the SHDN input is not required, it should be connected directly to the input supply. While in shutdown, supply current decreases to 0.05 µA(typical), VOUT falls to zero volts, and ERROR is open-circuited. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 ERROR Open Drain Output ERROR is driven low whenever VOUT falls out of regu- lation by more than -5% (typical). This condition may be caused by low input voltage, output current limiting or thermal limiting. The ERROR threshold is 5% below rated VOUT regardless of the programmed output volt- age value (e.g. ERROR =VOL at 4.75V (typ.) for a 5.0V regulator and 2.85V (typ.) for a 3.0V regulator). ERROR output operation is shown in Figure 4-2. Note that ERROR is active when VOUT falls to VTH,and inactive when VOUT rises above VTH by VHYS. As shown in Figure 3-1, ERROR can be used as a bat- tery low flag or as a processor RESET signal (with the addition of timing capacitor C2). R1 x C2 should be chosen to maintain ERROR below VIH of the processor RESET input for at least 200msec to allow time for the system to stabilize. Pull-up resistor R1 can be tied to VOUT,VIN or any other voltage less than (VIN +0.3V). The ERROR pin sink current is self-limiting to approxi- mately 18mA. FIGURE 3-2: ERROR OUTPUT OPERATION 3.2 Output Capacitor A1 µF(min) capacitor from VOUT to ground is required. The output capacitor should have an effective series resistance of 0.01 Ω.to 5Ω for VOUT = 2.5V, and 0.05Ω. to 5 Ω for VOUT <2.5V. A1µF capacitor should be con- nected from VIN to GND if there is more than 10 inches of wire between the regulator and the AC filter capaci- tor, or if a battery is used as the power source. Ceramic, tantalum and aluminum electrolytic capacitors can be used. (Since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalums are rec- ommended for applications operating below -25°C). When operating from sources other than batteries, sup- ply-noise rejection and transient response can be improved by increasing the value of the input and out- put capacitors and employing passive filtering tech- niques. 1µF C1 0.2µF C2 R1 1M V+ C2 Required Only if ERROR is used as a Processor RESET Signal (See Text) Shutdown Control (to CMOS Logic or Tie to V IN if unused) BATTLOW or RESET TC2054 TC2055 TC2186 VIN BATTERY VOUT ERROR SHDN GND VOUT 1µF VIH VOL ERROR V TH V OUT HYSTERESIS (V HYS) |
同様の部品番号 - TC2054 |
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同様の説明 - TC2054 |
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