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Analog Devices MAX25203 Dual-Phase Synchronous Boost Controller enables automotive infotainment systems to stay in regulation during cold-crank or start-stop operation all the way down to a battery input of 1.8V. The MAX25203 can also be used to generate voltage for display backlights and Class D audio amplifiers. This device can start with an input voltage supply from 4.5V to 42.0V and can operate down to 1.8V after start-up, and has a low 5µA shutdown supply current. The MAX25203 operates at up to 2.1MHz frequency to allow small external components and reduced output ripple and guarantee no AM band interference. The switching frequency is resistor adjustable from 220kHz to 2100kHz. The device can also be synchronized on the fly to an external clock and has a spread-spectrum option for frequency modulation to minimize EMI interference. A 90° out-of-phase clock output enables synchronizing a second MAX25203 for quad-phase operation.
The pass-through operation has over 98% efficiency when the supply voltage exceeds the output regulation voltage. Programmable current-limit blanking handles high peak loads without oversizing the inductor. The MAX25203 features a power-OK monitor and under-voltage lockout. Protection features include a cycle-by-cycle current limit and thermal shutdown. It operates over the -40°C to +125°C automotive temperature range. Analog Devices MAX25203 Synchronous Boost Controller is offered in a 32-pin TQFN-EP package with side-wettable flanks to enable optical inspection and increase reliability.
