Dual-output automotive buck controller with wide input range
The Maxim Integrated MAX20034ATIS/VY+ is a dual-output step-down (buck) switching controller rated for automotive environments, carrying AEC-Q100 qualification. It accepts a supply voltage from 3.5 V to 36 V, making it suitable for 12 V and 24 V vehicle electrical systems with margin for load-dump transients. The part integrates two independent controller channels in a single 28-TQFN (5x5 mm) package with a wettable flank for automated optical inspection of solder joints.
Switching frequency and clock synchronization
The switching frequency is programmable from 220 kHz to 2.2 MHz. Operating at the lower end maximises efficiency by reducing switching losses; the upper end shrinks the inductor and output capacitor footprint. The part also accepts an external clock synchronisation signal, which lets the designer phase-shift multiple converters to spread the EMI spectrum — a common requirement when passing CISPR 25 Class 5 radiated emissions tests.
Temperature range and automotive deployment
The operating temperature range spans -40°C to 125°C, covering under-hood, engine bay, and exterior-mounted electronics. The 99% maximum duty cycle allows the output to stay in regulation through cold-crank events where the battery voltage dips below 6 V. Synchronous rectification is built in, so no external Schottky diode is needed for the low-side switch — that saves one component per output and improves efficiency at high load.
Control features and output configuration
Each output is independently enabled, and the controller includes current limiting. The output configuration is positive, meaning the IC drives external N-channel MOSFETs on both the high-side and low-side positions. The transistor-driver output type is compatible with standard logic-level and standard-level FETs.