Synchronous step-down DC/DC regulator operates from a 4.4 V to 105 V input range and delivers up to 1 A of output current. The output voltage is adjustable from 1 V to VIN, with pin-selectable fixed output settings from 1.2 V to 15 V. Constant-frequency average current-mode control supports programmable switching from 200 kHz to 2 MHz and synchronization to an external clock. Low EMI operation is supported with CISPR 25 compliance, 35 ns minimum on-time, 100% maximum duty cycle operation, current programming, and current monitoring. The device is supplied in a thermally enhanced 36-lead QFN package measuring 5 mm by 6 mm by 0.75 mm with exposed pad.
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| Regulator topology | Synchronous step-down |
| Input voltage range | 4.4 to 105V |
| Absolute maximum input voltage | 110V |
| Output current | 1A |
| Output voltage range | 1 to VINV |
| Fixed output voltage settings | 1.2, 1.8, 2.5, 3.3, 3.6, 5, 12, 15V |
| Quiescent current in regulation | 2 typical at 48VIN to 3.3VOUTµA |
| Minimum on-time | 35ns |
| Switching frequency range | 200 to 2000kHz |
| Low preset frequency | 300 typicalkHz |
| High preset frequency | 1 typicalMHz |
| Maximum duty cycle | 100% |
| Operating junction temperature range | -40 to 125°C |
| EMI/EMC compliance | CISPR 25 compliant |
| Package | 36-lead QFN with exposed pad, 5mm x 6mm x 0.75mm |
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Demonstration circuit for the LT7101 synchronous step-down regulator, delivering 12V/1A from a 12V to 100V input range with low EMI performance.
