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SC1592ISTRT Datasheet(PDF) 6 Page - Samtec, Inc |
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SC1592ISTRT Datasheet(HTML) 6 Page - Samtec, Inc |
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6 / 19 page  6 © 2011 Semtech Corporation www.semtech.com SC1592 POWER MANAGEMENT Application Information The SC1592 is a 3A low dropout high performance linear voltage regulator. The SC1592 can be used for voltage applications as low as 0.8V and is ideal for down conversion utilizing dual supply configuration. This allows for extremely low dropout voltages with excellent load and line regulation. The SC1592 can be utilized in high voltage applications, with V IN and VCNTL up to 16V, providing there is adequate thermal management. SC1592 is designed to meet stringent requirements of current generation microprocessors and other sensitive electronic devices. This is possible by employing an additional bias source, V CNTL. The voltage of this supply needs to be at least 1.5V greater than the output voltage in order to achieve low dropout, typically less then 300mV. Unlike most of the other high current linear regulators, the SC1592 provides a programmable current limit which can be set with a single resistor. The value of the programming resistor is: LIM OUT LIM R V 240 I • ≈ where I LIM = selected current limit value V OUT = regulated output voltage R LIM = programmable current limit resistor The SC1592 has a fast transient response that allows it to handle large load changes associated with high current applications. Proper selection of the of the output capacitor and it’s ESR value determines stable operation and optimizes performance. The typical application shown in Figure 2 was tested with a wide range of different capacitors. The circuit was found to be unconditionally stable with capacitor values from 47μF to 330μF and ESR ranging from 0.5m Ω to greater then 75m Ω. It’s recommended to maintain 5-10mA through the output divider network in order to have a tight load and line regulation. Initial accuracy of the internal voltage reference V REF = 0.8V ±1% over full temperature range. This commands the use of 0.5% or better accuracy resistors to build a precision power supply. C1 2.2uF C2 22uF R1 C3 100uF R3 R2 +1.8V Vout +3.3V Vcntl +2.5V Vin SC1592 CNTL IN OUT SENSE ILIM EN GND 10k 66.5 53 100 Figure 2 The circuit in Figure 2 shows a typical application of 2.5V to 1.8V conversion with a 3.3V control supply and the load range of up to 3A steady state. Considering the approximate 2W power being dissipated by the pass element of the SC1592, we are still able to choose an SO-8 EDP package with T JA = 36.5°C/W mount on the 1sq.in. copper pad allocated for adequate heat transfer. The ambient temperature in this case should not exceed 50°C. If this temperature range is too restrictive, then the DDPAK can be utilized, having T JA = 29°C/W mount on the same size copper pad. Input capacitor: A minimum of 10μF ceramic capacitor is recommended to be placed directly next to the Vin pin. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, bulk capacitance may be added closely to the input supply pin of the SC1592 to ensure that Vin does not sag, improving load transient response. Output capacitor: A minimum bulk capacitance of 33μF, along with a 0.1μF ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC1592 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors. . typ V 8 . 0 V V ) 3 R 2 R 1 ( V REF REF OUT = • + = |
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