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AIC164250XTB Datasheet(PDF) 10 Page - Analog Intergrations Corporation |
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AIC164250XTB Datasheet(HTML) 10 Page - Analog Intergrations Corporation |
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10 / 14 page  AIC1642 10 ■ APPLICATION INFORMATION GENERAL DESCRIPTION AIC1642 PFM (pulse frequency modulation) control- ler ICs combine a switch mode regulator, N-channel power MOSFET, precision voltage reference, and voltage detector in a single monolithic device. They offer extreme low quiescient current, high efficiency, and very low gate threshold voltage to ensure start- up with low battery voltage (0.8V typ.). Designed to maximize battery life in portable products, and minimize switching losses by only switching as needed service the load. PFM controllers transfer a discrete amount of en- ergy per cycle and regulate the output voltage by modulating switching frequency with the constant turn-on time. Switching frequency depends on load, input voltage, and inductor value, and it can range up to 100KHz. The SW on-resistance is typically 1.9 to 2.2 Ω to minimize switch losses. When the output voltage drops, the error compara- tor enables 100kHz oscillator that turns on the MOSFET around 7.5us and 2.5us off time. Turning on the MOSFET allows inductor current to ramp up, storing energy in a magnetic field. When MOSFET turns off that force inductor current through diode to the output capacitor and load. As the stored energy is depleted, the current ramp down until the diode turns off. At this point, inductor may ring due to re- sidual energy and stray capacitance. The output ca- pacitor stores charge when current flowing through the diode is high, and release it when current is low, thereby maintaining a steady voltage across the load. As the load increases, the output capacitor dis- charges faster and the error comparator initiates cy- cles sooner, increasing the switching frequency. The maximum duty cycle ensure adequate time for energy transfer to output during the second half each cycle. Depending on circuit, PFM controller can operate in either discontinuous mode or con- tinuous conduction mode. Continuous conduction mode means that the inductor current does not ramp to zero during each cycle. + VIN SW V OUT EXT I D I OUT Isw Ico I IN I PK I IN VEXT ISW IOUT TDIS Charge Co. V SW Discharge Co. I D t Discontinuous Conduction Mode |
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