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AAT1151IKS-1.0-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT1151IKS-1.0-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
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8 / 16 page  AAT1151 850kHz 700mA Synchronous Buck DC/DC Converter 8 1151.2005.11.1.4 Functional Block Diagram VP = 2.7V- 5.5V VCC EN SGND PGND LOGIC 1.0V REF Temp. Sensing OSC OP. AMP LX FB DH DL CMP 1M Ω Operation Control Loop The AAT1151 is a peak current mode buck con- verter. The inner, wide bandwidth loop controls the peak current of the output inductor. The output inductor current is sensed through the P-channel MOSFET (high side) and is also used for short-cir- cuit and overload protection. A fixed slope com- pensation signal is added to the sensed current to maintain stability. The loop appears as a voltage programmed current source in parallel with the out- put capacitor. The voltage error amplifier output programs the cur- rent loop for the necessary inductor current to force a constant output voltage for all load and line condi- tions. The voltage feedback resistive divider is inter- nal, dividing the output voltage to the error amplifier reference voltage of 1.0V. The voltage error amplifi- er does not have the large DC gain typical of most error amplifiers. This eliminates the need for exter- nal compensation components, while still providing sufficient DC loop gain for load regulation. The volt- age loop crossover frequency and phase margin are set by the output capacitor value only. PFM/PWM Operation Light load efficiency is maintained by way of Pulse Frequency Modulation (PFM) control. The AAT1151 PFM control forces the peak inductor current to a minimum level regardless of load demand. At medi- um to high load demand, this has no effect on circuit operation and normal PWM controls take over. PFM reduces the switching frequency at light loads, thus reducing the associated switching losses. Soft Start/Enable Soft start increases the inductor current limit point in discrete steps when the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. When pulled low, the enable input forces the AAT1151 into a low-power, non-switching state. The total input current during shutdown is less than 1µA. Power and Signal Source Separate small signal ground and power supply pins isolate the internal control circuitry from the noise associated with the output MOSFET switching. The low pass filter R1 and C2 in schematic Figure 1 fil- ters the noise associated with the power switching. |
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