The synchronous 4-switch buck-boost controller is optimized for automotive USB-C Power Delivery supplies. It operates from a 4 V to 40 V input range and supports a single Type-C output up to 100 W with up to 98% peak efficiency. The controller provides ±1.5% output voltage regulation, programmable switching frequency, external synchronization, and spread-spectrum operation. Protection functions include overcurrent, overvoltage, short-circuit protection, and a power-good flag. The automotive #W orderable version is supplied in a 28-lead 4 mm × 5 mm side-solderable QFN package for −40 °C to 150 °C operation.
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| Controller topology | Synchronous 4-switch buck-boost |
| Input voltage range | 4 to 40V |
| Output voltage range | 1 to 25V |
| Maximum output power | 100W |
| Peak efficiency | 98% |
| Output voltage regulation accuracy | ±1.5% |
| Typical oscillator frequency | 400kHz |
| External sync frequency range | 150 to 650kHz |
| FB regulation voltage | 1.0 typicalV |
| VREF regulation voltage | 2.0 typicalV |
| INTVCC regulation voltage | 5.0 typicalV |
| Buck current sense threshold | 50 typicalmV |
| Boost current sense threshold | 50 typicalmV |
| Operating junction temperature range | -40 to 150°C |
| Package dimensions | 4 x 5mm |
| Pin count | 28 |
| Thermal resistance, junction-to-ambient | 43°C/W |
| Thermal resistance, junction-to-case | 3.4°C/W |
| Aec-q100 | Qualified for automotive applications |
| Lead-free Finish | #WPBF automotive product orderable listed under lead-free finish |
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These are design resources that include the Analog LT8253JUFDM#WPBF
Demonstration circuit DC3004A features the LT8253 buck-boost controller for 60W automotive USB-C PD charging with CISPR 25 Class 5 EMI performance.
