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SC8863-330CSKTRT Datasheet(PDF) 7 Page - Semtech Corporation |
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SC8863-330CSKTRT Datasheet(HTML) 7 Page - Semtech Corporation |
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7 / 11 page  7 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC8863 Theory Of Operation The SC8863 is intended for applications where very low dropout voltage, low supply current and low output noise are critical. It provides a very simple, low cost solution that uses very little pcb real estate. Fixed output voltage options require the use of only two external capacitors for operation. Each voltage option has both fixed and adjustable output voltage modes. Grounding the SET pin (pulling it below the Sense/Select threshold of 55mV) will connect the internal resistor divider to the error amplifier resulting with the internally preset output voltage. If SET is pulled above this threshold, then the Sense/Select switch will connect the SET pin to the error amplifier. The output will be regulated such that the voltage at SET will equal V SET, the SET reference voltage (typically 1.250V). An active high enable pin (EN) is provided to allow the customer to shut down the part and enter an extremely low power Off-state. A logic Low signal will reduce the supply current to 0.1nA. Component Selection - General Output capacitor: Semtech recommends a minimum capacitance of 1µF at the output with an equivalent series resistance (ESR) of <1 Ω over temperature. Ceramic capacitors are ideal for this application. Increasing the bulk capacitance will further reduce output noise and improve the overall transient response. Input capacitor: Semtech recommends the use of a 1µF ceramic capacitor at the input. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, input droop due to load transients is reduced, improving load transient response. Component Selection - Externally Set Output Please refer to Figure 1 below. The output voltage can be externally adjusted anywhere within the range from 1.25V to (V IN(MIN) - VD(MAX)). The output voltage will be in accordance with the following equation: + • = 2 R 1 R 1 250 . 1 V OUT C2 2.2uF Ceramic U1 SC8863 1 2 3 4 5 EN GND IN OUT SET R1 R2 10k C1 1uF Ceramic Figure 1: Externally set output 0.01 0.1 1 10 0.1 1 10 100 f (kHz) SC8863-2.8 VIN = 3.6V IOUT = 50mA TJ = 25°C COUT = 1µF COUT = 100µF 20 30 40 50 60 70 80 -50 -25 0 25 50 75 100 125 TJ (°C) VIN = 3.6V Sense/Select Threshold vs. Junction Temperature Output Spectral Noise Density vs. Frequency Typical Characteristics (Cont.) Applications Information |
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