Rainbow-electronics MAX15023 Bedienungsanleitung PDF herunterladen

General Description

The MAX15023 dual, synchronous step-down controller

operates from a 5.5V to 28V or 5V ±10% input voltage

range and generates two independent output voltages.

Each output is adjustable from 85% of the input voltage

down to 0.6V and supports loads of 12A or higher. Input

voltage ripple and total RMS input ripple current are

reduced by interleaved 180° out-of-phase operation.

The MAX15023 offers the ability to adjust the switching

frequency from 200kHz to 1MHz with an external resistor.

The MAX15023’s adaptive synchronous rectification elimi-

nates the need for external freewheeling Schottky diodes.

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

MAX15023 includes two independent power-good out-

puts and two independent enable inputs with precise

turn-on/turn-off thresholds, which can be used for supply

monitoring and for power sequencing.

Additional protection features include cycle-by-cycle,

low-side, sink peak current limit, and thermal shutdown.

Cycle-by-cycle, low-side, sink peak current limit prevents

reverse inductor current from reaching dangerous levels

when the device is sinking current from the output. The

MAX15023 also allows prebiased startup without dis-

charging the output and features adaptive internal digital

soft-start. This new proprietary feature enables monoton-

ic charging of externally large output capacitors at start-

up, and achieves good control of the peak inductor

current during hiccup-mode short-circuit protection.

The MAX15023 is available in a space-saving and ther-

mally enhanced 4mm x 4mm, 24-pin TQFN-EP pack-

age. The device operates over the -40°C to +85°C

extended temperature range.

Applications

Point-of-Load Regulators

Set-Top Boxes

LCD TV Secondary Supplies

Switches/Routers

Power Modules

DSP Power Supplies

Features

o 5.5V to 28V or 5V ±10% Input Supply Range

o 0.6V to (0.85 x V

) Adjustable Outputs

o Adjustable 200kHz to 1MHz Switching Frequency

o Guaranteed Monotonic Startup into a Prebiased

Load

o Lossless, Cycle-by-Cycle, Low-Side, Source Peak

Current Limit with Adjustable, Temperature-

Compensated Threshold

o Cycle-by-Cycle, Low-Side, Sink Peak Current-

Limit Protection

o Proprietary Adaptive Internal Digital Soft-Start

o ±1% Accurate Voltage Reference

o Internal Boost Diodes

o Adaptive Synchronous Rectification Eliminates

External Freewheeling Schottky Diodes

o Hiccup-Mode Short-Circuit Protection and

Thermal Shutdown

o Power-Good Outputs and Analog Enable Inputs

for Power Sequencing

MAX15023

Wide 4.5V to 28V Input, Dual-Output

Synchronous Buck Controller

________________________________________________________________

Maxim Integrated Products

*EP

*EXPOSED PAD (CONNECT TO GROUND).

EN1

PGOOD1

DL1

PGND1

FB1

FB2

PGOOD2

DL2

COMP2

PGND2

LIM2

456

1718 16 14 13

LIM1

COMP1

DH2

DH1

BST1

LX1

MAX15023

EN2

BST2

SGND

LX2

TQFN

TOP VIEW

Pin Configuration

Ordering Information

19-4219; Rev 0; 7/08

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-PACKAGE

MAX15023ETG+

-40°C to +85°C

24 TQFN-EP*

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad.

1 2 3 4 5 6 ... 26 27

Inhaltsverzeichnis

Seite 1 - Synchronous Buck Controller

General DescriptionThe MAX15023 dual, synchronous step-down controlleroperates from a 5.5V to 28V or 5V ±10% input voltagerange and generates two inde

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller10 _____________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller________________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller12 _____________________________________________________________________________

Seite 5

MAX15023The internal oscillator frequency is divided down toobtain separated clock signals for each regulator. Thephase difference of the two clock si

Seite 6

MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller14 _____________________________________________________________________________

Seite 7

MAX15023Each PGOOD_ goes high (high impedance) when thecorresponding regulator output increases above 92.5%of its nominal regulated voltage. Each PGOO

Seite 8

MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller16 _____________________________________________________________________________

Seite 9

MAX15023Setting the Output VoltageSet the MAX15023 output voltage on each channel byconnecting a resistive divider from the output to FB_ toSGND (Figu

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller18 _____________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller________________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller2 ______________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller20 _____________________________________________________________________________

Seite 14

MAX15023Type III Compensation Network (See Figure 5)If the output capacitor used is a low-ESR tantalum orceramic type, the ESR-induced zero frequency

Seite 15

MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller22 _____________________________________________________________________________

Seite 16

MAX15023To estimate the temperature rise of the die, use the fol-lowing equation:TJ= TA+ (PTx θJA)where θJAis the junction-to-ambient thermal resistan

Seite 17

MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller24 _____________________________________________________________________________

Seite 18

MAX15023Typical Application Circuits (continued)MAX1502322DH1 LIM29BST2 SGND1120DH2 IN1021LX2 RT1219BST1 LIM1823LX1 COMP1724514DL1 DL2415PGOOD1 PGOOD2

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller26 _____________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck ControllerMaxim cannot assume responsibility for use of any circuitry other than circuitry

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller________________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller4 ______________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller________________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller6 ______________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller________________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller8 ______________________________________________________________________________

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MAX15023Wide 4.5V to 28V Input, Dual-OutputSynchronous Buck Controller________________________________________________________________________________

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Rainbow-electronics MAX15023 Bedienungsanleitung

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Inhaltsverzeichnis

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