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MAX15046A

40V, High-Performance, Synchronous Buck Controller

40V Industrial Controller Operates at 1MHz

Data Sheet

Please check latest availability status for a specific part variant.

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

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Key Features

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

Applications/Uses

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

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

Power Good Signal

DC-DC Outputs

Oper. Freq.
(kHz)

Design Tools

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX15046

4.5

0.6

Resistor

External

Yes

1000

EE-Sim

QSOP/16

$1.51 @1k

See All Step-Down Switching Regulators (378)

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

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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