MAX15046B

40V, High-Performance, Synchronous Buck Controller

40V Industrial Controller Operates at 1MHz

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Overview

Input Voltage Ranges from 4.5V to 40V or 5V ±10%
Adjustable Outputs from 0.85 x V_IN Down to 0.6V
Adjustable Switching Frequency (100kHz to 1MHz) with ±10% (1MHz) Accuracy
Adaptive Internal Digital Soft-Start
Up to 25A Output Capability
Cycle-by-Cycle Valley-Mode Current Limit with Adjustable, Temperature-Compensated Threshold (30mV to 300mV)
Monotonic Startup into Prebiased Output
±1% Accurate Voltage Reference
90% Maximum Duty Cycle (MAX15046C)
3A-Peak Gate Drivers
Hiccup-Mode Short-Circuit Protection
Overtemperature Shutdown
Power-Good (PGOOD) Output and Enable Input (EN) with ±5% Accurate Threshold
Thermally Enhanced 16-Pin QSOP Package

The MAX15046 synchronous step-down controller operates from a 4.5V to 40V input voltage range and generates 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 resistor. The MAX15046'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 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 prevents reverse inductor current from reaching dangerous levels when the device is sinking current from the output.

The MAX15046A/MAX15046B feature soft-stop operation. Soft-stop operation is disabled in the MAX15046C.

The MAX15046 is available in a 16-pin QSOP or 16-pin QSOP-EP package and operates over the -40°C to +125°C temperature range.

Applications

Basestations
Industrial Power Supplies (PLC, Industrial Computers, Fieldbus Components, Fieldbus Couplers)
Telecom Power Supplies

Documentation

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX15046B

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Features and Benefits

5V to 40V (24V typ) Input Range
Optional 4.5V to 5.5V Input Range
3.3V at 10A Output
350kHz Switching Frequency
Enable Input
Power-Good Output
Fully Assembled and Tested

Product Details

The MAX15046B evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX15046B 10A synchronous step-down controller. The MAX15046 IC is available in a small 16-pin QSOP package with an exposed pad.

The MAX15046B EV kit requires a 5V to 40V input-voltage range power supply that provides up to 7A for normal operation. The MAX15046B EV kit output is configured to 3.3V and delivers up to 10A output current. The controller's switching frequency is programmed to 350kHz. The MAX15046B EV kit includes PCB pads to enable the circuit and to monitor the power-good output.

Applications

Basestations
Industrial Power Supplies (PLC, Industrial Computers, Fieldbus Components, Fieldbus Couplers)
Telecom Power Supplies

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Overview

Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 2