The inverting synchronous step-down regulator operates from a 3.4 V to 60 V input range and regulates outputs from 0 V to -28 V. It delivers up to 4 A of inductor current with integrated 110 mΩ top-side and 50 mΩ bottom-side N-channel MOSFETs. The switching frequency is resistor programmable from 300 kHz to 3 MHz and can synchronize over a ±50% range. Burst Mode and forced continuous operation support light-load efficiency or low output ripple, while peak current-mode control provides fast transient response and cycle-by-cycle current limiting. The device supports programmable soft-start, overtemperature protection, and board-ground-referenced RUN, PGOOD, and MODE/SYNC pins.
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| Regulator topology | Inverting synchronous step-down |
| Input voltage range | 3.4 to 60V |
| Output voltage range | 0 to -28V |
| Inductor current | 4A |
| Top-side MOSFET on-resistance | 110 typmΩ |
| Bottom-side MOSFET on-resistance | 50 typmΩ |
| Regulated quiescent current | 440 typµA |
| Shutdown quiescent current | 15 typµA |
| Switching frequency range | 300 to 3000kHz |
| Frequency synchronization range | 50 to 150 of programmed frequency% |
| Output voltage accuracy | ±0.8% |
| Peak current limit | 6 typA |
| Minimum on-time | 60 typns |
| RUN rising threshold | 1.2 typV |
| INTVCC LDO output voltage | 3.45 typV |
| Operating junction temperature range | -40 to 125°C |
| Efficiency | 92 with 12 V input and -5 V output% |
| Control architecture | Peak current mode |
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