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AAT1230ITP Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1230ITP Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 21 page  AAT1230/1230-1 18V 100mA Step-Up Converter 1230.2007.06.1.6 9 responds by increasing the peak inductor current, resulting in higher average current in the inductor. Alternatively, decreased output load results in an increase in the output feedback voltage (FB1 or FB2 pin). The controller responds by decreasing the peak inductor current, resulting in lower aver- age current in the inductor. At light load, the inductor OFF interval current goes below zero and the boost converter enters discon- tinuous mode operation. Further reduction in the load results in a corresponding reduction in the switching frequency. The AAT1230/1230-1 provide pulsed frequency operation which reduces switching losses and maintains high efficiency at light loads. Operating frequency varies with changes in the input voltage, output voltage, and inductor size. Once the boost converter has reached continuous mode, further increases in the output load will not significantly change the operating frequency. A small 2.2µH (±20%) inductor is selected to maintain high frequency switching (up to 2MHz) and high efficiency operation for outputs from 10V to 18V. Output Voltage Programming The output voltage may be programmed through a resistor divider network located from output capaci- tor to FB1/FB2 pins to ground. Pulling the SEL pin high activates the FB1 pin which maintains a 1.2V reference voltage, while the FB2 reference is dis- abled. Pulling the SEL pin low activates the FB2 pin which maintains a 0.6V reference, while the FB1 reference is disabled. This function allows dynam- ic selection between two distinct output voltages across a 2X range (maximum). An additional resis- tor between FB1 and FB2 allows the designer to program the outputs across a reduced <2X range. Alternatively, the output voltage may be dynamical- ly programmed to any of 16 voltage levels using the S 2Cwire serial digital input. The single wire S2Cwire interface provides high-speed output voltage pro- grammability across a 2X output voltage range. S 2Cwire functionality is enabled by pulling the SEL pin low and providing S 2Cwire digital clock input to the EN/SET pin. Table 2 details the FB2 reference voltage versus S 2Cwire rising clock edges. Soft Start / Enable The input disconnect switch is activated when a valid input voltage is present and the EN/SET pin is pulled high. The slew rate control on the P-chan- nel MOSFET ensures minimal inrush current as the output voltage is charged to the input voltage, prior to switching of the N-channel power MOS- FET. Monotonic turn-on is guaranteed by the built- in soft-start circuitry. Soft-start eliminates output voltage overshoot across the full input voltage range and all loading conditions. Fast and slow start-up time options are available. The AAT1230 provides start-up to regulated output voltage within 0.35ms of a low-to-high transition on the EN/SET pin. Alternatively, the AAT1230-1 pro- vides start-up to regulated output voltage within 3.5ms of a low-to-high transition on the EN/SET pin, which dramatically reduces inrush current. A longer soft-start, or turn-on, time is a preferred fea- ture in battery-powered systems that exhibit higher source impedances. Some applications may require the output to be active when a valid input voltage is present. In these cases, add a 10k Ω resistor between the VIN, VP, and EN/SET pins to avoid startup issues. Current Limit and Over-Temperature Protection The switching of the N-channel MOSFET termi- nates when current limit of 3.0A (typical) is exceed- ed. This minimizes power dissipation and compo- nent stresses under overload and short-circuit con- ditions. Switching resumes when the current decays below the current limit. Thermal protection disables the AAT1230/1230-1 when internal dissipation becomes excessive. Thermal protection disables both MOSFETs. The junction over-temperature threshold is 140°C with -15°C of temperature hysteresis. The output voltage automatically recovers when the over-temperature or over-current fault condition is removed. Under-Voltage Lockout Internal bias of all circuits is controlled via the V IN input. Under-voltage lockout (UVLO) guarantees sufficient V IN bias and proper operation of all inter- nal circuitry prior to soft start. |
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