MAX5073双通道降压转换器工作于2MHz开关频率的参考设计
时间：05-05
来源：美信
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| R3 | 4.7Ω | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R4, R8, R10 | 1.18kΩ | Resistors | SMD, 1%, 0.125W | 603 | Vishay | 3 |
| R5, R9 | 27.4kΩ | Resistors | SMD, 1%, 0.125W | 603 | Vishay | 2 |
| R6 | 10kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R7 | 12.7kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R12 | 2.2Ω | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R13 | 6.19kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| R14 | 8.76kΩ | Resistor | SMD, 1%, 0.125W | 603 | Vishay | 1 |
| U1 | MAX5073 | Dual buck converter | MAX5073ETI+ | 32-TQFN_EP (5mm x 5mm) | Maxim | 1 |
实际测量电路获得的数据给出了器件的效率指标，详细内容参见表2和表3。
表2. VOUT2禁止时的效率指标
fSW = 2MHz、LOUT = 4.7µH、COUT = 22µF/6.3V (陶瓷电容)
| VIN (V) | IIN (A) | VOUT1 (V) | IOUT1 (A) | Efficiency (%) |
| 14.007 | 0.065732 | 3.3371 | 0.1018 | 36.8973371 |
| 14.010 | 0.183690 | 3.3339 | 0.5122 | 66.3542117 |
| 14.005 | 0.267750 | 3.3321 | 0.8032 | 71.3722082 |
| 14.007 | 0.329490 | 3.3309 | 1.0112 | 72.9812485 |
| 14.005 | 0.449290 | 3.3298 | 1.4007 | 74.1230723 |
| 14.002 | 0.584520 | 3.3281 | 1.8203 | 74.0201375 |
| 14.001 | 0.650260 | 3.3267 | 2.0150 | 73.6279304 |
表3. VOUT1禁止时的效率指标
fSW = 2MHz、LOUT = 4.7µH、COUT = 22µF/6.3V (陶瓷电容)
| VIN (V) | IIN (A) | VOUT2 (V) | IOUT2 (A) | Efficiency (%) |
| 14.008 | 0.044533 | 2.5350 | 0.1075 | 43.6845979 |
| 14.008 | 0.067144 | 2.5337 | 0.2049 | 55.1967881 |
| 14.003 | 0.087638 | 2.5337 | 0.3010 | 62.1452787 |
| 14.004 | 0.109076 | 2.5337 | 0.4003 | 66.3986847 |
| 14.005 | 0.133680 | 2.5337 | 0.5122 | 69.3178710 |
| 14.005 | 0.155350 | 2.5338 | 0.6097 | 71.0058542 |
| 14.008 | 0.255976 | 2.5334 | 1.0001 | 70.6597037 |
在稳定性方面，图2和图3所示为每路输出的波特图，详细说明了每路输出的增益和相位。
图2. 3.3V/1.4A VOUTPUT波特图
图3. 2.5V/0.6A VOUTPUT波特图
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