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SP6200 Datasheet(PDF) 13 Page - Exar Corporation |
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SP6200 Datasheet(HTML) 13 Page - Exar Corporation |
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13 / 17 page  S SP P6 62 20 00 0 / / S SP P6 62 20 01 1 1 10 00 0m mA A/ /2 20 00 0m mA A M Miic crro op po ow we err C CM MO OS S L LD DO O R Re eg gu ulla atto orrs s © 2012 Exar Corporation 13/17 Rev. 2.1.0 PROTECTION Current limit behavior is very well controlled, providing less than 10% variation in the current limit threshold over the entire temperature range for both SP6200 and SP6201. The SP6200 has a current limit of 140mA, while the SP6201 has a current limit of 420mA. Thermal shutdown activates at 162°C and deactivates at 147°C. Thermal shutdown is very repeatable with only a 2 to 3 degree variation from device to device. Thermal shutdown changes by only 1 to 2 degrees with Vin change from 4V to 7V. ENABLE (SHUTDOWN NOT) INPUT The LDOs are turned off by pulling the EN pin low and turned on by pulling it high. If it is not necessary to shut down the LDO, the EN (pin 3) should be tied to IN (pin 1) to keep the regulator output on at all time. The enable threshold is 0.9V and does not change more than 100mV over the entire temperature and VIN voltage range. The lot to lot variations in Enable Threshold are also within 100mV. Shutdown current is guaranteed to be <1µA without requiring the user to pull enable all the way to 0V. Standard TTL or CMOS levels will transition the device from totally on to totally off. RESET NOT (VOUT GOOD) OUTPUT An accurate VOUT good indicator is provided on all the fixed output version devices, pin 4 (RSN), Figure 1. This is an open drain, logic output that can be used to hold a microprocessor or microcontroller in a RESET condition when its power supplied by VOUT is 4% out of nominal regulation. A 1% hysteresis is included in the Reset Not function, so that false alarms are not issued as a result of LDO's output noise. The Reset Not function reacts in 10 to 50μs. ADJUSTABLE OUTPUT VERSION The adjustable version can be programmed to any voltage from 2.7V to 6V for the industrial temperature range; 2.5V to 6V for the commercial temperature range. The output cannot be programmed below 2.5V due a headroom restriction. Since the bandgap is bootstrapped to the output, the output voltage must be above the minimum bandgap supply voltage. The bandgap requires 2.7V or greater at -40°C and requires 2.5V or greater at 0°C. The regulator's output can be adjusted to a specific output voltage by using two external resistors, see block diagram. The resistor's set the output voltage based on the following equation: Resistor values are not critical because the ADJ node has a high input impedance, but for best results use resistors of 470kΩ or less. A capacitor from ADJ to VOUT pin provides improved noise performance as is shown in the following plot. Fig. 42: Noise Performance 10Hz to 100kHz INPUT CAPACITOR A small capacitor, 1μF or higher, is required from VIN to GND to create a high frequency bypass for the LDO amplifier. Any ceramic or tantalum capacitor may be used at the input. Capacitor ESR (effective series resistance) should be smaller than 3Ω. OUTPUT CAPACITOR An output capacitor is required between VOUT and GND to prevent oscillation; a capacitance as low as 0.22μF can fulfill stability requirements in most applications. A 1μF capacitor will ensure unconditional stability from no load to full load over the entire input voltage, output voltage and temperature range. Larger capacitor values improve the |
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