The MAX20021/MAX20022 power management ICs (PMICs) from Maxim integrate four low-voltage, high-efficiency, step-down DC-DC converters.
Each of the four outputs is factory- or resistor-programmable between 1,0 V and 4,0 V and can deliver up to 1,0 A of current. The PMICs operate from 3,0 V to 5,5 V, making them well suited for automotive point-of-load and post-regulation applications.
The devices feature fixed-frequency PWM-mode operation with a switching frequency of 2,2 MHz or 3,2 MHz. High-frequency operation allows for an all-ceramic capacitor design and small external components. The low-resistance on-chip switches ensure high efficiency at heavy loads while minimising critical inductances, making the layout a much simpler task with respect to discrete solutions. Internal current sensing and loop compensation reduce board space and system cost.
The ICs offer a spread-spectrum option to reduce radiated emissions. Two of the four buck converters operate 180° out of phase with the internal clock, which feature reduces the necessary input capacitance and improves EMI as well. All four buck converters operate in constant-PWM mode outside the AM band. A SYNC input is offered to synchronise to an external clock. The chips provide individual enable inputs and power-good/reset outputs, as well as factory-programmable active-low reset times.
The PMICs offer several important protection features including input over-voltage protection, input under-voltage monitoring, input under-voltage lockout, cycle-by-cycle current limiting, and over-temperature shutdown. The input under-voltage monitor indicates a brownout condition by driving PG_ low when the input falls below the UVM threshold.
The MAX20021/MAX20022 are available in a 28-pin TQFN package with an exposed pad and are specified for operation over the -40°C to +125°C automotive temperature range.
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