Rainbow-electronics MAX15046B Uživatelský manuál stáhnout pdf (Strana 1)

_______________________________________________________________ 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

MAX15046

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

Q10%

S Adjustable Outputs from 0.85 x V

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 Q1% 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

CSP

BST

DRV

PGND

GND

PGOOD

LIM

COMP

0.6V TO 0.85V x V

OUT

4.5V TO 40V

OFF

PART TEMP RANGE PIN-PACKAGE

MAX15046AAEE+ -40

C to +125

C 16 QSOP

MAX15046BAEE+ -40

C to +125

C 16 QSOP-EP*

1 2 3 4 5 6 ... 22 23

Shrnutí obsahu

Strany 1 - MAX15046

_______________________________________________________________ Maxim Integrated Products 1For pricing, delivery, and ordering information, pleas

Strany 2

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Strany 6

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Strany 11

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Strany 12

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Strany 13

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Strany 14 - Inductor Selection

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Strany 15 - Output Capacitor

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Strany 16

40V, High-Performance, Synchronous Buck ControllerMAX15046Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely em

Strany 17 - (See Figure 4)

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Strany 18 - MOSFET Selection

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Strany 19

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Strany 20

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Strany 21 - TYPICAL APPLICATION CIRCUIT 1

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Strany 22 - TYPICAL APPLICATION CIRCUIT 2

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Strany 23

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