This is an automatic buck-boost module based on LM3488.
The design parameters are:
Input voltage: 5~24V
Output voltage: 12V
Output current: 1A
In the actual test (output 12V@1A, input 5~24V continuous test) the highest efficiency is about 86%, and the lowest efficiency is about 75%.
If a damping resistor and a fast turn-off diode are added to the MOS tube gate, the efficiency will be improved.
The inductor uses 1260 coupled inductor;
The sampling resistor and compensation circuit parameters can be modified according to your own needs.
Figure 1 Schematic diagram
Figure 2 PCB Layout
Table 1 Bill of Materials
| Item Number | Value | Footprint | Quantity | Part Reference |
| 1 | 1uF/35V | 0603 | 1 | C1 |
| 2 | 820pF/50V | 0603 | 1 | C2 |
| 3 | 100nF/50V | 0603 | 1 | C3 |
| 4 | 100pF/50V | 0603 | 1 | C4 |
| 5 | 100nF/50V | 0805 | 1 | C5 |
| 6 | 100uF/35V | Case D8 | 2 | C6, C7 |
| 7 | MKDS-1/2-3,81 | 3.81-2P | 2 | CN1, CN2 |
| 8 | B560C | SMC | 1 | D1 |
| 9 | Red | 0603 | 1 | D2 |
| 10 | DC-005-20A | DC-005-3P | 1 | J1 |
| 11 | 15uH/4.27A | 1260 | 1 | L1 |
| 12 | DMTH8028LPSW-13 | PowerPAK SO-8 | 1 | Q1 |
| 13 | 13mR/1% | 1210 | 1 | R1 |
| 14 | 100R/1% | 0603 | 1 | R2 |
| 15 | 46.4K/1% | 0603 | 1 | R3 |
| 16 | 1.24K/1% | 0603 | 1 | R4 |
| 17 | 20R/1% | 0805 | 1 | R5 |
| 18 | 10K/1% | 0603 | 2 | R6,R8 |
| 19 | 84.5K/1% | 0603 | 1 | R7 |
| 20 | LM3488MM/NOPB | VSSOP8 | 1 | U1 |
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