The MAX15026 synchronous step-down controller operates from a 4.5V to 28V input voltage range and generates an adjustable output voltage from 85% of the input voltage down to 0.6V while supporting loads up to 25A. The device allows monotonic startup into a prebiased bus without discharging the output and features adaptive internal digital soft-start. The MAX15026 offers the ability to adjust the switching frequency from 200kHz to 2MHz with an external resistor. The MAX15026’s adaptive synchronous rectification eliminates the need for an external freewheeling Schottky diode. 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 protects 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 conditions. The MAX15026 includes a power-good output and an enable input with precise turn-on/turn-off threshold, which can be used for input supply monitoring and for power sequencing. Additional protection features include sink-mode current limit and thermal shutdown. Sink-mode current limit prevents reverse inductor current from reaching dangerous levels when the device is sinking current from the output. The MAX15026 is available in a space-saving and thermally enhanced 3mm x 3mm, 14-pin TDFN.
The Maxim MAX15026 is a synchronous step‑down DC‑DC regulator that operates from 4.5 V to 28 V input and delivers up to 25 A output. It features an internal digital control loop, selectable switching frequency from 200 kHz to 2 MHz, and supports external MOSFETs for high‑current applications. The device includes protection features such as over‑current limit, thermal shutdown and soft‑start.
The datasheet provides absolute maximum ratings, detailed electrical characteristics, pin descriptions, typical efficiency curves, and package information for the 14‑pin TDFN‑EP package. It also outlines recommended external component values for optimal performance.
| Input Voltage Range | 4.5 V to 28 V |
|---|---|
| Output Voltage Range | 0.6 V to (0.85 × Vin) |
| Switching Frequency Range | 200 kHz to 2 MHz |
| Maximum Output Current | 25 A |
| Quiescent Supply Current (typical) | 1.75 mA – 2.75 mA |
The MAX15026 operates with an input voltage from 4.5 V up to 28 V.
It supports a selectable switching frequency between 200 kHz and 2 MHz.
The device can deliver up to 25 A of output current.