Rainbow-electronics MAX5099 Manual de usuario descargar pdf

General Description

The MAX5099 offers a dual-output, high-switching-fre-

quency DC-DC buck converter with an integrated high-

side switch. The MAX5099 integrates two low-side

MOSFET drivers to allow each converter to drive an

external synchronous-rectifier MOSFET. Converter 1

delivers up to 2A output current, and converter 2 can

deliver up to 1A of output current. The MAX5099 inte-

grates load-dump protection circuitry that is capable of

handling load-dump transients up to 80V for automotive

applications. The load-dump protection circuit utilizes

an internal charge pump to drive the gate of an external

n-channel MOSFET. When an overvoltage or load-

dump condition occurs, the series protection MOSFET

absorbs the high voltage transient to prevent damage

to lower voltage components.

The DC-DC converter operates over a wide 4.5V to 19V

operating voltage range. The MAX5099 operates 180°

out-of-phase with an adjustable switching frequency to

minimize external components while allowing the ability

to make trade-offs between the size, efficiency, and

cost. The high switching frequency also allows these

devices to operate outside the AM band for automotive

applications. These regulators can be protected

against high voltage transients such as a load-dump

condition by using the integrated overvoltage controller.

This device utilizes voltage-mode control for stable

operation and external compensation, so that the loop

gain is tailored to optimize component selection and

transient response. The MAX5099 has a maximum duty

cycle of 92.5% and is synchronized to an external clock

fed at the SYNC input.

Additional features include internal digital soft-start,

individual enable for each DC-DC regulator (EN1 and

EN2), open-drain power-good outputs (PGOOD1 and

PGOOD2), and shutdown input (ON/OFF).

Other features of the MAX5099 include overvoltage pro-

tection and short-circuit (hiccup current limit) and ther-

mal protection. The MAX5099 is available in a thermally

enhanced, exposed pad 5mm x 5mm, 32-pin TQFN

package and operates over the automotive -40°C to

+125°C temperature range.

Applications

Automotive AM/FM Radio Power Supply

Automotive Instrument Cluster Display

Features

♦ Wide 4.5V to 5.5V or 5.2V to 19V Input Voltage

Range with 80V Load-Dump Protection

♦ Dual-Output DC-DC Converter with Integrated

Power MOSFETs

♦ Adjustable Outputs from 0.8V to 0.9V

♦ Output Current Capability Up to 2A and 1A

♦ Switching Frequency Programmable from 200kHz

to 2.2MHz

♦ Synchronization Input (SYNC)

♦ Individual Converter Enable Input and Power-

Good Output

♦ Low-I

(7µA) Standby Current (ON/OFF)

♦ Internal Digital Soft-Start and Soft-Stop

♦ Short-Circuit Protection on Outputs and

Maximum Duty-Cycle Limit

♦ Overvoltage Protection on Outputs with Auto

Restart

♦ Thermal Shutdown

♦ Thermally Enhanced 32-Pin TQFN Package

Dissipates Up to 2.7W at +70°C

MAX5099

Dual, 2.2MHz, Automotive Synchronous Buck

Converter with 80V Load-Dump Protection

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4112; Rev 0; 5/08

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.

Pin Configuration appears at end of data sheet.

EVALUATION KIT

AVAILABLE

Denotes a lead-free package.

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX5099ATJ+

-40°C to +125°C

32 TQFN-EP*

1 2 3 4 5 6 ... 26 27

Indice de contenidos

Pagina 1 - Ordering Information

General DescriptionThe MAX5099 offers a dual-output, high-switching-fre-quency DC-DC buck converter with an integrated high-side switch. The MAX5099 i

Pagina 2 - ELECTRICAL CHARACTERISTICS

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection10 ____________________________________________________________

Pagina 3

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection_______________________________________________________________

Pagina 4

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection12 ____________________________________________________________

Pagina 5 - Information

MAX5099Functional DiagramCONVERTER 1COMP1PGOOD1SOURCE1VDRVDL1DRAIN1V+BYPASSFSEL_1EN1SYNCOSCEN2DRAIN2PGOOD2CONVERTER 2VLVDRVCLK2LDOQSR0.2V0.74V0.8VTRAN

Pagina 6

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection14 ____________________________________________________________

Pagina 7

MAX5099ON/OFFThe MAX5099 provide an input (ON/OFF) to turn on andoff the external load-dump protection MOSFET. DriveON/OFF high for normal operation.

Pagina 8

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection16 ____________________________________________________________

Pagina 9

MAX5099Thermal-Overload ProtectionDuring continuous short circuit or overload at the output,the power dissipation in the IC can exceed its limit. TheM

Pagina 10

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection18 ____________________________________________________________

Pagina 11 - Pin Description

MAX5099Output CapacitorThe allowable output ripple voltage and the maximumdeviation of the output voltage during step load cur-rents determine the out

Pagina 12 - Pin Description (continued)

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection2 _____________________________________________________________

Pagina 13 - Functional Diagram

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection20 ____________________________________________________________

Pagina 14 - Detailed Description

MAX5099Calculate the temperature rise of the die using the fol-lowing equation:TJ = TCx (PT x θJC)where θJCis the junction-to-case thermal impedance o

Pagina 15

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection22 ____________________________________________________________

Pagina 16 - Enable (EN1, EN2)

MAX50992) Place a zerowhere RF≥ 10kΩ.3) Calculate CIfor a target crossover frequency, fC:where ωC= 2π x fC.4) Place a poleor 5 x fC, whichever is lowe

Pagina 17 - Applications Information

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection24 ____________________________________________________________

Pagina 18

MAX5099BST2/VDD2SOURCE2SOURCE2PGNDFB2COMP2PGOOD2EN2SYNC31132302967459C6D12625244328D2C7L1C20C9R9C8R6R22R7R8R12JU4C11C12 C13191821VOUT1PGNDSGND201712VL

Pagina 19 - Boost Converter

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection26 ____________________________________________________________

Pagina 20 - Power Dissipation

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump ProtectionMaxim cannot assume responsibility for use of any circuitry oth

Pagina 21 - Compensation

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection_______________________________________________________________

Pagina 22 - Boost Converter Compensation

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection4 _____________________________________________________________

Pagina 23 - Improving Noise Immunity

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection_______________________________________________________________

Pagina 24 - Layout Procedure

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection6 _____________________________________________________________

Pagina 25

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection_______________________________________________________________

Pagina 26 - Typical Application Circuit

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection8 _____________________________________________________________

Pagina 27 - Package Information

MAX5099Dual, 2.2MHz, Automotive Synchronous BuckConverter with 80V Load-Dump Protection_______________________________________________________________

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