MAX15026 Datasheet | Maxim Integrated

19-4108; Rev 0; 5/08 KIT ATION EVALU E L B A IL AVA Low-Cost, Small, 4.5V to 28V Wide Operating Range, DC-DC Synchronous Buck Controller .. General Description Features - 4.5V to 28V or 5V ±10% Input Supply Range - 0.6V to (0.85 x VIN) Adjustable Output - Adjustable 200k Hz to 2MHz Switching Frequency - Ability to Start into a Prebiased Load - Lossless, Cycle-by-Cycle Valley Mode Current Limit with Adjustable, Temperature-pensated Threshold - - - - - - - - - Sink-Mode Current-Limit Protection Adaptive Internal Digital Soft-Start ±1% Accurate Voltage Reference Internal Boost Diode Adaptive Synchronous Rectification Eliminates External Freewheeling Schottky Diode Hiccup-Mode Short-Circuit Protection Thermal Shutdown Power-Good Output and Enable Input for Power Sequencing ±5% Accurate Enable Input Threshold 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 200k Hz 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 ponents from damage during output overloaded conditions or output shortcircuit 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....