Synchronous step-down regulator uses Silent Switcher architecture to reduce EMI while operating at high switching frequencies. The device supports a 3.4 V to 42 V input range and delivers 5 A continuous output current with 7 A peak transient capability. External compensation enables fast transient response and current sharing. The regulator provides Burst Mode operation, forced continuous mode, spread-spectrum operation, soft-start, power-good signaling, and synchronization from 200 kHz to 3 MHz. It is supplied in a 20-lead 4 mm by 3 mm LQFN package and includes automotive-qualified ordering options.
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| Regulator topology | Synchronous step-down |
| Input voltage range | 3.4 to 42V |
| Maximum continuous output current | 5A |
| Peak transient output current | 7A |
| Minimum input voltage | 3.0 min, 3.4 typV |
| LT8637 VIN quiescent current in sleep | 230 typ, 290 max with BIAS = 0 VuA |
| Feedback reference voltage | 0.970 typV |
| Feedback voltage line regulation | 0.004 typ, 0.02 max%/V |
| Minimum switch on-time | 30 typns |
| Minimum off-time | 80 typ, 110 maxns |
| Adjustable switching frequency | 200 to 3000kHz |
| Top power NMOS on-resistance | 66 typmOhm |
| Top power NMOS current limit | 7.5 min, 10 typ, 12.5 maxA |
| Bottom power NMOS on-resistance | 27 typmOhm |
| EN/UV rising threshold | 0.94 min, 1.0 typ, 1.06 maxV |
| Spread spectrum modulation frequency range | 22 typ% |
| Package | 20-lead 4 mm x 3 mm x 0.94 mm LQFN |
| Operating junction temperature range | -40 to 125 for E grade; -40 to 150 for J grade°C |
| RoHS | Compliant for PBF orderable parts |
| WEEE | Compliant for PBF orderable parts |
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