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LP2985-10 Datasheet(PDF) 13 Page - Texas Instruments |
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LP2985-10 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 29 page VOUT VIN Schottky LP2985 VOUT VIN LP2985 www.ti.com SLVS522O – JULY 2004 – REVISED JANUARY 2015 Application Information (continued) 8.1.3.2 Output Capacitor (COUT) As an advantage over other regulators, the LP2985 permits the use of low-ESR capacitors at the output, including ceramic capacitors that can have an ESR as low as 5 m Ω. Tantalum and film capacitors also can be used if size and cost are not issues. The output capacitor also should be located within 1 cm of the output pin and be returned to a clean analog ground. As with other PNP LDOs, stability conditions require the output capacitor to have a minimum capacitance and an ESR that falls within a certain range. • Minimum COUT: 2.2 μF (can be increased without limit to improve transient response stability margin) • ESR range: see Figure 18 through Figure 20 It is critical that both the minimum capacitance and ESR requirement be met over the entire operating temperature range. Depending on the type of capacitors used, both these parameters can vary significantly with temperature (see capacitor characteristics). 8.1.3.3 Noise Bypass Capacitor (CBYPASS) The LP2985 allows for low-noise performance with the use of a bypass capacitor that is connected to the internal bandgap reference via the BYPASS pin. This high-impedance bandgap circuitry is biased in the microampere range and, thus, cannot be loaded significantly, otherwise, its output – and, correspondingly, the output of the regulator – changes. Thus, for best output accuracy, dc leakage current through CBYPASS should be minimized as much as possible and never should exceed 100 nA. A 10-nF capacitor is recommended for CBYPASS. Ceramic and film capacitors are well suited for this purpose. 8.1.3.4 Reverse Input-Output Voltage There is an inherent diode present across the PNP pass element of the LP2985. With the anode connected to the output, this diode is reverse biased during normal operation, since the input voltage is higher than the output. However, if the output is pulled higher than the input for any reason, this diode is forward biased and can cause a parasitic silicon-controlled rectifier (SCR) to latch, resulting in high current flowing from the output to the input. Thus, to prevent possible damage to the regulator in any application where the output may be pulled above the input, or the input may be shorted to ground, an external Schottky diode should be connected between the output and input. With the anode on output, this Schottky limits the reverse voltage across the output and input pins to ∼0.3 V, preventing the regulator’s internal diode from forward biasing. Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 |
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