データシートサーチシステム |
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SC622A データシート(PDF) 15 Page - Semtech Corporation |
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SC622A データシート(HTML) 15 Page - Semtech Corporation |
15 / 23 page SC622A 15 Applications Information (continued) Programmable LDO Outputs Two low dropout (LDO) regulators are provided for camera module I/O and core power. Each LDO has at least 100mA of available load current with ±3.5% accuracy. The minimum current limit is 200mA, so outputs greater than 100mA are possible at somewhat reduced accuracy. A 1μF, low ESR capacitor should be used as a bypass capacitor on each LDO output to reduce noise and ensure stability. In addition, it is recommended that a minimum 22nF capacitor be connected from the BYP pin to ground to minimize noise and achieve optimum power supply rejection. A larger capacitor can be used for this function, but at the expense of increasing turn- on time. Capacitors with X7R or X5R ceramic dielectric are strongly recommended for their low ESR and superior temperature and voltage characteristics. Y5V capacitors should not be used as their temperature coefficients make them unsuitable for this application. Shutdown State The device is disabled when the EN pin is low. All registers are reset to default condition when EN is low. Sleep Mode When the LED is off, sleep mode is activated. This is a reduced current mode that helps minimize overall current consumption by turning off the clock and the charge pump while continuing to monitor the serial interface for commands. Both LDOs can be powered up while in sleep mode. I2C Compatible Interface Functions All device functions can be controlled via the I2C compatible interface. The interface is described in detail in the Serial Interface section of the datasheet. Protection Features The SC622A provides several protection features to safeguard the device from catastrophic failures. These features include: Output Open Circuit Protection Over-Temperature Protection Charge Pump Output Current Limit LDO Current Limit LED Float Detection Output Open Circuit Protection Over-Voltage Protection (OVP) is provided at the VOUT pin to prevent the charge pump from producing an excessively high output voltage. In the event of an open circuit at VOUT, the charge pump runs in open loop and the voltage rises up to the OVP limit. OVP operation is hysteretic, meaning the charge pump will momentarily turn off until V OUT is sufficiently reduced. The maximum OVP threshold is 6.0V, allowing the use of a ceramic output capacitor rated at 6.3V with no fear of over-voltage damage. Over-Temperature Protection The Over-Temperature (OT) protection circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 160°C, the device goes into thermal shutdown with all outputs disabled until the junction temperature is reduced. All register information is retained during thermal shutdown. • • • • • |
同様の部品番号 - SC622A |
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同様の説明 - SC622A |
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