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AATIAN31 Datasheet(PDF) 1 Page - SiGe Semiconductor, Inc. |
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AATIAN31 Datasheet(HTML) 1 Page - SiGe Semiconductor, Inc. |
1 / 5 page EV-110 AAT1157 EVAL 1MHz 1.4A Buck Regulator Introduction The AAT1157 evaluation board demonstrates performance, along with the suggested size and placement of external components, for the AAT1157 integrated buck regulator. The external components are selected for minimum size and optimum operation up to 1.4A output current. Resistors R3 and R4 set the output voltage. Please refer to the AAT1157 product datasheet for more details about this product. Layout As with all switching power supplies, board layout for the AAT1157 is critical (see Figure 1). Special care has been taken with the placement of the external components. The input capacitor (C1) placement is critical. It must be located immediately adjacent to the AAT1157. As shown in Figure 2, the LX node trace has been rout- ed under C1 in order to facilitate a close placement of C1 next to the IC. The output voltage feedback trace has been routed on the portion of the back side of the board which has a ground plane on the top side (see Figure 3). The trace is also routed to avoid the LX node and associated noise. Figure 1: AAT1157 Evaluation Board Schematic. Table 1: AAT1157 Evaluation Board Specification. Specification Test Conditions Min Typ Max Units Input Voltage 2.7 3.6 5.5 V Output Error Voltage ±3 % Output Current 0 1.4 A 3.0 µH L1 2x 22 µF C3-C7 10 µF C1 100 Ω R1 0.1 µF C2 VOUT+ VIN+ LX 14 LL 6 EN 7 VCC 9 VP 10 N/C 8 LX 13 PGND 3 VP 12 VP 11 FB 4 LX 15 PGND 2 PGND 1 SGND 5 N/C 16 AAT1157 U1 100k Ω R6 R3 59k Ω R4 100k Ω R2 Enable LX GND GND LL EV-110.2005.04.1.1 1 |
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