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AAT1106ICB-0.6-T1 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1106ICB-0.6-T1 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 18 page  AAT1106 600mAStep-Down Converter 1106.2007.07.1.0 9 Functional Block Diagram PWM LOGIC DRV OSC SLOPE COMP BLANKING EA COMP 0.6V SW COUT FB/OUT VOUT 0.6V VIN REF EN VIN + - VIN2.7-5.5V IZERO COMP ISENSE COMP + - + - Q S R Q R RS LATCH SHUTDOWN 1 5 4 3 2 R1 R2* R2 R1 *For adjustable output R1 + R2 are external 0.65V + - OVDET + - - + GND Functional Description The AAT1106 is a high performance 600mA, 1.5MHz fixed frequency monolithic switch-mode step-down converter which uses a current mode architecture with an adaptive slope compensation scheme. It minimizes external component size and optimizes efficiency over the complete load range. Theadaptiveslopecompensationallowsthedevice to remain stable over a wider range of inductor val- ues so that smaller values (1µH to 4.7µH) with associatedlowerDCRcanbeusedtoachievehigh- er efficiency. Apart from the small bypass input capacitor, only a small L-C filter is required at the output. The fixed output version requires only three external powercomponents(CIN,COUT,andL).The adjustable version can be programmed with exter- nal feedback to any voltage, ranging from 0.6V to the input voltage. It uses internal MOSFETs to achieve high efficiency and can generate very low output voltage by using an internal reference of 0.6V.Atdropout,theconverterdutycycleincreases to100%andtheoutputvoltagetrackstheinputvolt- age minus the low RDS(ON) drop of the P-channel high-sideMOSFET. Theinputvoltagerangeis2.5V to 5.5V. The converter efficiency has been opti- mized for all load conditions, ranging from no load to 600mA at VIN = 3V. The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Current Mode PWM Control Slope compensated current mode PWM control provides stable switching and cycle-by-cycle cur- rent limit for excellent load and line response and protection of the internal main switch (P-channel MOSFET) and synchronous rectifier (N-channel MOSFET). During normal operation, the internal P- channel MOSFET is turned on for a specified time to ramp the inductor current at each rising edge of the internal oscillator, and is switched off when the feedback voltage is above the 0.6V reference volt- age. The current comparator, ICOMP, limits the peak inductor current. When the main switch is off, the synchronous rectifier turns on immediately and stays on until either the inductor current starts to reverse, as indicated by the current reversal com- parator, IZERO, or the beginning of the next clock cycle. |
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