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AAT1146IJS-1.8-T1 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT1146IJS-1.8-T1 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 20 page  AAT1146 Fast Transient 400mA Step-Down Converter SwitchRegTM PRODUCT DATASHEET 10 1146.2008.06.1.6 www .analogictech.com Control Loop The AAT1146 is a peak current mode step-down con- verter. The current through the P-channel MOSFET (high side) is sensed for current loop control, as well as short circuit and overload protection. A fixed slope compensa- tion signal is added to the sensed current to maintain stability for duty cycles greater than 50%. The peak cur- rent mode loop appears as a voltage-programmed cur- rent source in parallel with the output capacitor. The output of the voltage error amplifier programs the current mode loop for the necessary peak switch current to force a constant output voltage for all load and line conditions. Internal loop compensation terminates the transconductance voltage error amplifier output. For fixed voltage versions, the error amplifier reference volt- age is internally set to program the converter output voltage. For the adjustable output, the error amplifier reference is fixed at 0.6V. Soft Start / Enable Soft start limits the current surge seen at the input and eliminates output voltage overshoot. When pulled low, the enable input forces the AAT1146 into a low-power, non-switching state. The total input current during shut- down is less than 1μA. Current Limit and Over-Temperature Protection For overload conditions, the peak input current is limit- ed. To minimize power dissipation and stresses under current limit and short-circuit conditions, switching is terminated after entering current limit for a series of pulses. Switching is terminated for seven consecutive clock cycles after a current limit has been sensed for a series of four consecutive clock cycles. Thermal protection completely disables switching when internal dissipation becomes excessive. The junction over-temperature threshold is 140°C with 15°C of hys- teresis. Once an over-temperature or over-current fault conditions is removed, the output voltage automatically recovers. Under-Voltage Lockout Internal bias of all circuits is controlled via the VIN input. Under-voltage lockout (UVLO) guarantees sufficient VIN bias and proper operation of all internal circuitry prior to activation. L1 CDRH3D16-4R7 4.7µH L1 10µF C1 4.7µF C2 U1 AAT1146 SC70JW-8 C1 10µF 10V 0805 X5R C2 4.7µF 10V 0805 X5R VOUT GND VIN 1 2 3 Enable LX EN 1 OUT 2 VIN 3 LX 4 AGND 5 PGND 6 PGND 7 PGND 8 AAT1146 U1 GND2 118k R1 CFF 59k R2 Figure 1: Enhanced Transient Response Schematic. |
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