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AOZ3011PI Datasheet(PDF) 6 Page - Alpha & Omega Semiconductors |
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AOZ3011PI Datasheet(HTML) 6 Page - Alpha & Omega Semiconductors |
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6 / 14 page  AOZ3011PI Rev. 0.6 August 2012 www.aosmd.com Page 6 of 14 Efficiency Detailed Description The AOZ3011PI is a current-mode step down regulator with an integrated high-side PMOS switch and a low-side NMOS switch. The AOZ3011PI operates from a 4.5 V to 18 V input voltage range and supplies up to 3 A of load current. Features include enable control, power-on reset, input under voltage lockout, output over voltage protection, external soft-start and thermal shut down. The AOZ3011PI is available in an exposed pad SO-8 package. Enable and Soft Start The AOZ3011PI has an external soft start feature to limit in-rush current and ensure the output voltage ramps up smoothly to regulation voltage. The soft start process begins when the input voltage rises to 4.1 V and voltage on the EN pin is HIGH. In the soft start process, the FB voltage is ramped to follow the voltage of the soft start pin until it reaches 0.8 V. The voltage of the soft-start pin is charged by an internal 5 µA current. The EN pin of the AOZ3011PI is active high. Connect the EN pin to VIN if the enable function is not used. Pulling EN to ground will disable the AOZ3011PI. Do not leave EN open. The voltage on the EN pin must be above 2 V to enable the AOZ3011PI. When the EN pin voltage falls below 0.6 V, the AOZ3011PI is disabled. Steady-State Operation Under heavy load steady-state conditions, the converter operates in fixed frequency and Continuous-Conduction Mode (CCM). The AOZ3011PI integrates an internal P-MOSFET as the high-side switch. Inductor current is sensed by amplifying the voltage drop across the drain to source of the high side power MOSFET. Output voltage is divided down by the external voltage divider at the FB pin. The difference of the FB pin voltage and reference voltage is amplified by the internal transconductance error amplifier. The error voltage, which shows on the COMP pin, is compared against the current signal, which is the sum of inductor current signal and ramp compensation signal, at the PWM comparator input. If the current signal is less than the error voltage, the internal high-side switch is on. The inductor current flows from the input through the inductor to the output. When the current signal exceeds the error voltage, the high-side switch is off. The inductor current is freewheeling through the internal low-side N-MOSFET switch to output. The internal adaptive FET driver guarantees no turn on overlap of both the high-side and the low-side switch. Efficiency (VIN = 12V, L = 4.7µH) vs. Load Current 100 95 90 85 80 75 70 65 60 55 50 0 0.5 1.0 1.5 2.0 2.5 3.0 Load Current (A) 5V OUTPUT 3.3V OUTPUT 1.8V OUTPUT 1.2V OUTPUT |
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