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MAX15046A

MAX15046A

40V, High-Performance, Synchronous Buck Controller

40V Industrial Controller Operates at 1MHz

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Overview

Description

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.
MAX15046: Typical Operating Circuit MAX15046: Typical Operating Circuit Enlarge+

Key Features

  • Input Voltage Ranges from 4.5V to 40V or 5V ±10%
  • Adjustable Outputs from 0.85 x VIN 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

Applications/Uses

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

Parametric Specs

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX15046 4.5400.636Resistor25ExternalYesYes11000EE-Sim
QSOP/16
$1.59 @1k
See All Step-Down Switching Regulators (404)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


MAX15046BEVKIT: Evaluation Kit for the MAX15046B

Technical Documents

Tutorial 5133 Power-Supply Solutions for Altera FPGAs
Tutorial 5132 Power-Supply Solutions for Xilinx FPGAs

Quality and Environmental Data

Request Reliability Report for: MAX15046A 
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Reference Designs

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Evaluation Board6381MAX15046BEVKIT Evaluation Kit for the MAX15046B