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TC1268-2.5VOA Folha de dados(PDF) 4 Page - Microchip Technology |
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TC1268-2.5VOA Folha de dados(HTML) 4 Page - Microchip Technology |
4 / 12 page TC1268 DS21379B-page 4 © 2002 Microchip Technology Inc. 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 3.0 DETAILED DESCRIPTION The TC1268 is a precision, fixed output LDO. Unlike bipolar regulators, the TC1268 supply current does not increase with load current. In addition, VOUT remains stable and within regulation over the entire 0mA to ILOAD MAX load current range, (an important consideration in RTC and CMOS RAM battery back-up applications). Figure 3-1 shows a typical application circuit. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 Turn On Response The turn on response is defined as two separate response categories, Wake-up Time (TWK) and Settling Time (TS). The TC1268 has a fast Wake-up Time (5 µsec typical) when released from shutdown. See Figure 3-2 for the Wake-up Time designated as TWK.The Wake-up Time is defined as the time it takes for the output to rise to 2% of the VOUT value after being released from shutdown. The total turn on response is defined as the Settling Time (TS), seeFigure 3-2. Settling Time(inclusivewith TWK) is defined as the condition when the output is within 2% of its fully enabled value (15 µsec typical) when released from shutdown. The settling time of the output voltage is dependent on load conditions and output capacitance on VOUT (RC response). The Wake-up Time (TWK) is an important parameter to consider when using the TC1268 in RAMBUS applications. In this application, the bus voltage is held at 2.5V by a switching regulator during normal power conditions and can be switched to low power mode, where the TC1268 takes over and supplies the same 2.5V, but at a much lower current (300mA). In order to not see the bus voltage drop during the transition from high power to low power, the TC1268 has a very fast wake-uptimeof 5 µsec to support the 2.5V rail. This makes the TC1268 ideal for applications involving RAMBUS. FIGURE 3-2: WAKE-UP RESPONSE TIME Pin No. (8-Pin SOIC) Symbol Description 1VOUT Regulated voltage output. 2 GND Ground terminal. 3 NC No connect. 4 BYPASS Reference bypass input. Connecting a 470pF to this input further reduces output noise. 5 ERROR Out-of-Regulation Flag. (Open drain output). This output goes low when VOUT is out-of-tolerance by approximately -5%. 6 SHDN Shutdown control input. The regulator is fully enabled when a logic high is applied to this input. The regulator enters shutdown when a logic low is applied to this input. During shutdown, output voltage falls to zero and supply current is reduced to 5 µA(typical). 7 NC No connect. 8VIN Unregulated supply input. CIN 1 µF Battery TC1268 VIN VOUT V+ C1 COUT 1 µF CBYP 10nF GND BYP SHDN OFF ON C1 required only if ERROR is used as a processor RESET signal (See Text) VOUT 0.2 µF R1 1M SHDN ERROR + + + + – VIH TS TWK VOUT 98% 2% VIL SHDN |
Nº de peça semelhante - TC1268-2.5VOA |
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Descrição semelhante - TC1268-2.5VOA |
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