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TC1305 Datasheet(PDF) 5 Page - Microchip Technology |
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TC1305 Datasheet(HTML) 5 Page - Microchip Technology |
5 / 18 page © 2002 Microchip Technology Inc. DS21526A-page 5 TC1305 3.0 DETAILED DESCRIPTION The TC1305 is a precision fixed output voltage regulator that contains two fully independent 150mA regulator outputs. The device features separate shutdown modes for low-power operation, and a common bypass pin that can be used to further reduce output noise. The Select Mode™ operation allows the user to select VOUT1 and VOUT2 from three different values (2.5V, 2.8V, 3.0V), therefore providing high design flexibility. The CMOS construction of the TC1305 results to a very low supply current, which does not increase with load changes. In addition, VOUT remains stable and within regulation at no load currents. The TC1305 also features an integrated microproces- sor supervisor that monitors power-up, power-down, and brown-out conditions. The active low RESET signal is asserted when the detected voltage VDET falls below the reset voltage threshold (2.63V). The RESET output remains low for 300msec (typical) after VDET rises above the reset threshold. The RESET output of the TC1305 is ensured valid down to VDET = 1V and is optimized to reject fast transient glitches on the monitored power supply line. 4.0 TYPICAL APPLICATIONS 4.1 Input and Output Capacitor The TC1305 is stable with a wide range of capacitor values and types. A capacitor with a minimum value of 1 µFfrom VOUT to Ground is required. The output capacitor should have an effective series resistance (ESR) of 0.1 Ω to 10Ω for a 1µF capacitor and 0.01Ω to 10 Ω for a 10µF capacitor. A 1µF capacitor should be connected from the VIN to GND if there is more than 10 inches of wire between the regulator and the AC filter capacitor, or if a battery is used as the power source. Aluminum electrolytic or tantalum capacitor types can be used. (Since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalums are recommended for applications operating below -20°C). When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 4.2 Bypass Capacitor A0.01 µF capacitor connected from the bypass input to ground reduces noise present on the internal reference, which in turn significantly reduces output noise. If output noise is not a concern, this input may be left unconnected. Larger capacitor values may be used, but result in a longer time period to rated output voltage when power is initially applied. 4.3 Shutdown Mode Applying a logic high to each of the shutdown pins turns on the corresponding output. Each regulator enters shutdown mode when a logic low is applied in the corresponding input. During shutdown mode, the out- put voltage falls to zero, and regulator supply current is reducedto0.5 µA (max). If shutdown mode is not necessary, the pins should be connected to VIN. |
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