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SC632 Datasheet(PDF) 11 Page - Semtech Corporation |
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SC632 Datasheet(HTML) 11 Page - Semtech Corporation |
11 / 14 page SC632 11 Short-Circuit Current Protection Short-circuit current protection is provided to limit the current that can be sourced when the output is shorted to ground. When a short circuit forces V OUT to drop below 2V, the SCCP detects the condition and limits the output current to 600mA (typical). Over-Temperature Protection The over-temperature circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 165°C, the device is disabled. It remains disabled until the junction tempera- ture drops below this threshold. Hysteresis is included that prevents the device from re-enabling until the junc- tion temperature is reduced by 20°C. Capacitor Selection The SC632 is designed to use low-ESR ceramic capacitors for the input and output bypass capacitors as well as the charge pump bucket capacitors. Ideal performance is achieved when the bucket capacitors are exactly equal. The value of input and output decoupling capacitors will vary with system requirements. For best ripple perfor- mance C IN and C OUT are normally 22μF and the bucket capacitors C 1 and C 2 are 2.2μF. For low profile designs, two 10μF capacitors may be used in place of each 22μF. Applications Information (continued) When selecting capacitors for an application, first consider the DC voltage characteristic of the capacitor. The value of capacitance at the DC operating voltage may be con- siderably lower than the rated value. The following table lists recommended capacitor values which have been chosen to minimize the impact of this limitation. Table 1 — Recommended Capacitors Capacitor Value μF Case Size Notes C IN , C OUT 22 0805 Typical output V PP ≤ 20mV in all charge pump modes Typical input ripple ≤ 100mV in all charge pump modes C BUCKET 2.2 0603 Required for the full rated output current C BUCKET 2.2 0402 Useful for load current up to 300mA NOTE: Use only X5R type capacitors, with a 6.3V rating or higher The highest capacitance values in the smallest package sizes will tend to have poor DC voltage characteristics. The highest value 0402 size capacitor retains as little as 35% of its rated value at 5VDC. The same value chosen in the next larger package size, 0603, will retain about 60% of its rated value at 5VDC. |
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