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AIC3417 Datasheet(PDF) 10 Page - Analog Intergrations Corporation |
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AIC3417 Datasheet(HTML) 10 Page - Analog Intergrations Corporation |
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10 / 13 page  AIC3417 10 APPLICATION INFORMATION The AIC3417 is a synchronous step-up DC-DC con- verter. It is based on constant Off Time/PSM controller topology. At the beginning of each clock cycle, the main switch (NMOS) is turned on and the inductor current starts to ramp. After the sense current signal equals the error amplifier (EA) output, the main switch is turned off and the synchronous switch (PMOS) is turned on. The device can operate with an input voltage below 2.5V; the typical start-up voltage is 0.9V. Current Limit Protection The over current protection can limit the main switch current. The output voltage will be dropped when over current is happened. The over current protection circuit will turn off the main switch once the current exceeds its threshold. Zero Current Detection The zero current comparator monitors the inductor current to the output and shuts off the synchronous rectifier when the inductor current reduces to zero. This prevents the inductor current from reversing in polarity and improves the efficiency at light load condition. Device Shutdown For the active high version, when EN is set logic high or floating, the AIC3417 is put into active mode operation. If EN is set logic low, the device is put into shutdown mode and consumes less than 1μA. At the shutdown mode, the synchronous switch will turn off and the output voltage of AIC3417 step-up converter will reduce to 0V. After start-up, the internal circuitry is supplied by VOUT. However, if shutdown mode is enabled, the internal circuitry will be supplied by the input source again. Low-Battery Detection AIC3417 contains an on-chip comparator with 10mV internal hysteresis for low battery detection. If the voltage at LBI falls below 0.5V, LBO (an open-drain output) sinks current to GND. The component value of resistor R5 connecting between LBO pin and VOUT pin should be larger than 1M . Power Good Indicator AIC3417 contains an on-chip comparator for power good detection. If the output voltage is lower than power good low threshold, PGOOD (an open-drain output) sinks current to GND. Adjustable Output Voltage An external resistor divider is used to set the output voltage. The output voltage of the switching regulator (VOUT) is determined by the following equation: 4 3 FB OUT R R 1 V V Where VFB is 0.5V reference voltage. Input Inductor Selection A 1 μH~3.3μH input inductor is recommended for most AIC3417 applications. Although small size and high efficiency are major concerns, the inductor should have low core losses at operation frequency and low DCR (copper wire resistance). It is important to ensure the inductor saturation current exceeding the peak inductor current in application to prevent core saturation. For CCM (Continuous Conduction Mode) operation, the peak inductor current can be calculated from: L f 2 D V I I S ) MAX ( ) MIN ( IN MAX IN PEAK L f 2 D V V V I S ) MAX ( ) MIN ( IN ) MIN ( IN OUT ) MAX ( OUT Input Capacitor Selection Surfaces mount 10 μF or greater, X5R or X7R, ceramic capacitor is suggested for the input capacitor. The input capacitor provides a low impedance loop for the edges of pulsed current drawn by the AIC3417. Low ESR/ESL X7R and X5R ceramic capacitors are ideal for this function. To minimize stray inductance, the capacitor should be placed as close as possible to the IC. This keeps the high frequency content of the input current |
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