Other Parts Discussed in Thread: TPS61023
Hi,
I am working on a design for 2.4V - 3.3V input and output at 3.3V/200mA. I believe when operating at 3.3Vin down conversion mode is active, which explains the low efficiency. When I increase the output to be 3.37V, efficiency increases but is still lower than desired.
Efficiency data is below.
From my understanding the down conversion cannot be disabled. Is there a method for maximizing efficiency when Vin is very close to Vout? What efficiency should I expect under these conditions?
Or is this the wrong part for this application?
Thanks,
Ben
Vout = 3.25V
| Vin (V) | Iin (A) | Pin (W) | Vout (V) | Iout (A) | Pout(W) | Efficiency (%) |
| 3.326 | 0.027 | 0.09 | 3.256 | 0.020 | 0.07 | 72.52% |
| 3.319 | 0.054 | 0.18 | 3.246 | 0.040 | 0.13 | 72.44% |
| 3.316 | 0.079 | 0.26 | 3.229 | 0.060 | 0.19 | 73.71% |
| 3.313 | 0.103 | 0.34 | 3.223 | 0.078 | 0.25 | 73.58% |
| 3.309 | 0.130 | 0.43 | 3.217 | 0.098 | 0.31 | 73.21% |
| 3.304 | 0.158 | 0.52 | 3.211 | 0.118 | 0.38 | 72.52% |
| 3.299 | 0.185 | 0.61 | 3.238 | 0.138 | 0.45 | 73.11% |
| 3.294 | 0.216 | 0.71 | 3.233 | 0.160 | 0.52 | 72.48% |
| 3.290 | 0.243 | 0.80 | 3.229 | 0.179 | 0.58 | 72.14% |
| 3.284 | 0.274 | 0.90 | 3.225 | 0.201 | 0.65 | 71.90% |
Vout = 3.37V
| Vin (V) | Iin (A) | Pin (W) | Vout (V) | Iout (A) | Pout(W) | Efficiency (%) |
| 3.322 | 0.021 | 0.07 | 3.385 | 0.018 | 0.06 | 87.83% |
| 3.318 | 0.046 | 0.15 | 3.372 | 0.040 | 0.13 | 87.93% |
| 3.313 | 0.072 | 0.24 | 3.381 | 0.060 | 0.20 | 84.76% |
| 3.310 | 0.097 | 0.32 | 3.371 | 0.080 | 0.27 | 83.78% |
| 3.306 | 0.119 | 0.39 | 3.375 | 0.100 | 0.34 | 85.62% |
| 3.301 | 0.148 | 0.49 | 3.338 | 0.120 | 0.40 | 81.85% |
| 3.297 | 0.172 | 0.57 | 3.325 | 0.140 | 0.46 | 81.85% |
| 3.292 | 0.198 | 0.65 | 3.323 | 0.160 | 0.53 | 81.37% |
| 3.305 | 0.223 | 0.74 | 3.333 | 0.180 | 0.60 | 81.22% |
| 3.300 | 0.248 | 0.82 | 3.378 | 0.200 | 0.67 | 82.39% |
3.3Vin, 3.37Vout, 200mA Load, Zoom