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TC1173-5.0VUA Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC1173-5.0VUA Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 7 page 3 300mA CMOS LDO With Shutdown, ERROR Output, And Bypass TC1173 TC1173-2 2/2/00 SHDN may be controlled by a 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 and ERROR is disabled. ERROR 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 regard- less of the programmed output voltage 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 2. Note that ERROR is active when VOUT is at or below VTH, and inactive when VOUT is above VTH + VH. As shown in Figure 1, ERROR can be used as a battery low flag, or as a processor RESET signal (with the addition of timing capacitor C2). R1 x C3 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.) Output Capacitor A 1 µF (min) capacitor from VOUT to ground is recom- mended. The output capacitor should have an effective series resistance of 5 Ω or less. A 1µF capacitor should be connected from 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 electro- lytic 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 – 25 °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. DETAILED DESCRIPTION The TC1173 is a fixed output, low drop-out regulator. Unlike bipolar regulators, the TC1173 supply current does not increase with load current. In addition, VOUT remains stable and within regulation at very low load currents (an important consid- eration in RTC and CMOS RAM battery back-up applications). TC1173 pin functions are detailed below: PIN DESCRIPTIONS Pin No. 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 Out- put). 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 0.05 µA (typical). 7 NC No connect 8VIN Unregulated supply input Figure 1 shows a typical application circuit. The regula- tor is enabled any time the shutdown input (SHDN) is above VIH, and shutdown (disabled) when SHDN is at or below VIL. Figure 1: Typical Application Circuit Figure 2: ERROR Output Operation VOUT VTH VIH Hysteresis (VH) VOL ERROR TC1173 1 2 3 4 5 6 7 8 VOUT VOUT Shutdown Control (from Power Control Logic) C1 1 µF GND NC VIN NC SHDN Bypass CBYPASS 470pF (Optional) ERROR R3 1M VIN ERROR |
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