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7440530047 データシート(PDF) 10 Page - Skyworks Solutions Inc. |
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7440530047 データシート(HTML) 10 Page - Skyworks Solutions Inc. |
10 / 19 page 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201998B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 AAT1162 12V, 1.5A Step-Down DC/DC Converter DATA SHEET High efficiency is maintained under light load conditions by automatically switching to variable frequency Light Load control. In this condition, transition losses are reduced by operating at a lower frequency at light loads. Short-Circuit Protection The AAT1162 uses a cycle-by-cycle current limit to pro- tect itself and the load from an external fault condition. When the inductor current reaches the internally set 3.0A current limit, the P-channel MOSFET switch turns off and the N-channel synchronous rectifier is turned on, limiting the inductor and the load current. During an overload condition, when the output voltage drops below 50% of the regulation voltage (0.3V at FB), the AAT1162 switching frequency drops by a factor of 4. This gives the inductor current ample time to reset dur- ing the off time to prevent the inductor current from rising uncontrolled in a short-circuit condition. Thermal Protection The AAT1162 includes thermal protection that disables the regulator when the die temperature reaches 140ºC. It automatically restarts when the temperature decreas- es by 25ºC or more. Applications Information Setting the Output Voltage Figure 1 shows the basic application circuit for the AAT1162 and output setting resistors. Resistors R1 and R2 program the output to regulate at a voltage higher than 0.6V. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for R2 is 5.9kΩ. Although a larger value will further reduce quies- cent current, it will also increase the impedance of the feedback node, making it more sensitive to external noise and interference. Table 1 summarizes the resistor values for various output voltages with R2 set to either 5.9kΩ for good noise immunity or 59kΩ for reduced no load input current. PGND AGND LX LX IN IN EN DGND FB AAT1162 C6 10μF VIN 4.5V- 13.2V L1 3.8μH C1 100pF C3 22μF R3 432k Ω R6 59k Ω VOUT 5V, 1.5A 3 5 4 6 9 2 1 11 10 AIN 7 DGND LDO DGND COMP LX DGND R5 24k Ω C7 330pF C9 1μF C2 0.1μF R4 10 Ω 14 8 13 16 EP1 EP2 C8 1μF Figure 1: Typical Application Circuit. The adjustable feedback resistors, combined with an external feed forward capacitor (C1 in Figure 1), deliver enhanced transient response for extreme pulsed load applications. The addition of the feed forward capacitor typically requires a larger output capacitor C3 for stabil- ity. Larger C1 values reduce overshoot and undershoot during startup and load changes. However, do not exceed 470pF to maintain stable operation. |
同様の部品番号 - 7440530047 |
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同様の説明 - 7440530047 |
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