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MAX15046 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX15046 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 23 page _______________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 40V, High-Performance, Synchronous Buck Controller General Description The MAX15046 synchronous step-down controller oper- ates from a 4.5V to 40V input voltage range and gener- ates an adjustable output voltage from 85% of the input voltage down to 0.6V, 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 MAX15046 offers the ability to adjust the switching frequency from 100kHz to 1MHz with an external resis- tor. The MAX15046’s adaptive synchronous rectifica- tion 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 resis- tor. 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 MAX15046 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 pre- vents reverse inductor current from reaching dangerous levels when the device is sinking current from the output. The MAX15046 is available in a 16-pin QSOP or 16-pin QSOP-EP package and operates over the -40NC to +125NC temperature range. Features S Input Voltage Ranges from 4.5V to 40V or 5V Q 10% S Adjustable Outputs from 0.85 x VIN Down to 0.6V S Adjustable Switching Frequency (100kHz to 1MHz) with Q10% (1MHz) Accuracy S Adaptive Internal Digital Soft-Start S Up to 25A Output Capability S Cycle-by-Cycle Valley-Mode Current Limit with Adjustable, Temperature-Compensated Threshold (30mV to 300mV) S Monotonic Startup into Prebiased Output S Q 1% Accurate Voltage Reference S 3A-Peak Gate Drivers S Hiccup-Mode Short-Circuit Protection (Patent- Pending Architecture) S Overtemperature Shutdown S Power-Good (PGOOD) Output and Enable Input (EN) with Q5% Accurate Threshold S Thermally Enhanced 16-Pin QSOP Package Applications Industrial Power Supplies (PLC, Industrial Computers, Fieldbus Components, Fieldbus Couplers) Telecom Power Supplies Base Stations 19-4719; Rev 0; 7/09 Pin Configurations appear at end of data sheet. Ordering Information +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Typical Operating Circuit MAX15046 IN VCC DH CSP LX BST DL DRV PGND GND C1 Q1 Q2 PGOOD EN LIM COMP FB RT L1 0.6V TO 0.85V x VIN VOUT D1 R5 C4 C3 C2 R2 R3 R3 C6 C5 R4 4.5V TO 40V VIN ON OFF C7 R1 PART TEMP RANGE PIN-PACKAGE MAX15046AAEE+ -40°C to +125°C 16 QSOP MAX15046BAEE+ -40°C to +125°C 16 QSOP-EP* |
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