MAXIM MAX15023ETG+T

The MAX15023 dual, synchronous step-down controller operates from a 5.5V to 28V or 5V±10% input voltage range and generates two independent output voltages. Each output is adjustable from 85% of the input voltage down to 0.6V and supports loads of 12A or higher. Input voltage ripple and total RMS input ripple current are reduced by interleaved 180° out-of-phase operation. The MAX15023 offers the ability to adjust the switching frequency from 200kHz to 1MHz with an external resis- tor. The MAX15023’s adaptive synchronous rectification eliminates the need for external freewheeling Schottky diodes. The device also utilizes the external low-side MOSFET’s on-resistance as a current-sense element, eliminating the need for a current-sense resistor. This pro- tects the DC-DC components from damage during output overloaded conditions or output short-circuit faults without requiring a current-sense resistor. Hiccup-mode current limit reduces power dissipation during short-circuit con- ditions. The MAX15023 includes two independent pow- er-good outputs and two independent enable inputs with precise turn-on/turn-off thresholds, which can be used for supply monitoring and for power sequencing. Additional protection features include cycle-by-cycle, low-side, sink peak current limit, and thermal shutdown. Cycle-by-cycle, low-side, sink peak current limit prevents reverse inductor current from reaching dangerous levels when the device is sinking current from the output. The MAX15023 also allows prebiased startup without dis- charging the output and features adaptive internal digital soft-start. This new proprietary feature enables monotonic charging of externally large output capacitors at startup, and achieves good control of the peak inductor current during hiccup-mode short-circuit protection. The MAX15023 is available in a space-saving and ther- mally enhanced 4mm×4mm, 24-pin TQFN-EP package. The device operates over the -40℃ to +85℃ extended temperature range.

• 5.5V to 28V or 5V±10% Input Supply Range
• 0.6V to (0.85×VIN) Adjustable Outputs
• Adjustable 200kHz to 1MHz Switching Frequency
• Guaranteed Monotonic Startup into a Prebiased Load
• Lossless, Cycle-by-Cycle, Low-Side, Source Peak Current Limit with Adjustable, Temperature-Compensated Threshold
• Cycle-by-Cycle, Low-Side, Sink Peak Current-Limit Protection
• Proprietary Adaptive Internal Digital Soft-Start
• ±1% Accurate Voltage Reference
• Internal Boost Diodes
• Adaptive Synchronous Rectification Eliminates External Freewheeling Schottky Diodes
• Hiccup-Mode Short-Circuit Protection and Thermal Shutdown
• Power-Good Outputs and Analog Enable Inputs for Power Sequencing

• Switches/Routers
• Power Modules
• DSP Power Supplies
• Point-of-Load Regulators
• Set-Top Boxes
• LCD TV Secondary Supplies