Rainbow-electronics MAX5090C Manual de usuario descargar pdf

General Description

The MAX5090A/B/C easy-to-use, high-efficiency, high-

voltage step-down DC-DC converters operate from an

input voltage up to 76V, and consume only 310µA qui-

escent current at no load. This pulse-width-modulated

(PWM) converter operates at a fixed 127kHz switching

frequency at heavy loads, and automatically switches

to pulse-skipping mode to provide low quiescent cur-

rent and high efficiency at light loads. The MAX5090

includes internal frequency compensation simplifying

circuit implementation. The device can also be syn-

chronized with external system clock frequency in a

noise-sensitive application. The MAX5090 uses an

internal low on-resistance and a high-voltage DMOS

transistor to obtain high efficiency and reduce overall

system cost. This device includes undervoltage lock-

out, cycle-by-cycle current limit, hiccup-mode output

short-circuit protection, and overtemperature shutdown.

The MAX5090 delivers up to 2A output current. External

shutdown is included, featuring 19µA (typ) shutdown

current. The MAX5090A/MAX5090B versions have fixed

output voltages of 3.3V and 5V, respectively, while the

MAX5090C features an adjustable 1.265V to 11V output

voltage.

The MAX5090 is available in a space-saving 16-pin thin

QFN package (5mm x 5mm) and operates over the

automotive temperature range (-40°C to +125°C).

Applications

Automotive

Industrial

Distributed Power

Features

♦ Wide Input Voltage Range: 6.5V to 76V

♦ Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)

Output-Voltage Versions

♦ 2A Output Current

♦ Efficiency Up to 92%

♦ Internal 0.26Ω High-Side DMOS FET

♦ 310µA Quiescent Current at No Load

♦ 19µA Shutdown Current

♦ Internal Frequency Compensation

♦ Fixed 127kHz Switching Frequency

♦ External Frequency Synchronization

♦ Thermal Shutdown and Short-Circuit Current Limit

♦ -40°C to +125°C Automotive Temperature Range

♦ 16-Pin (5mm x 5mm) Thin QFN Package

♦ Capable of Dissipating 2.67W at +70°C

MAX5090A/B/C

2A, 76V, High-Efficiency MAXPower Step-Down

DC-DC Converters

________________________________________________________________ Maxim Integrated Products 1

N.C.

ON/OFF

PGND

DRAIN

11 9

N.C.

SYNC

MA5090

BST SGND

DRAIN

TQFN

TOP VIEW

Pin Configuration

PGND

BST

SGND

OUT

5V/2A

100µH

BST

0.22µF

3.3µF

ON/OFF

OUT

100µF

SYNC

PDS5100H

DRAIN

0.047µF

68µF

BYPASS

0.47µF

10Ω

7.5V TO 76V

MAX5090B

Typical Operating Circuit

19-3872; Rev 0; 3/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP

RANGE

PIN-

PACKAGE*

OUTPUT

VOLTAGE

(V)

MAX5090AATE+

-40°C to +125°C 16 TQFN-EP**

3.3

MAX5090AATE

-40°C to +125°C 16 TQFN-EP**

3.3

MAX5090BATE+

-40°C to +125°C 16 TQFN-EP**

5.0

MAX5090BATE

-40°C to +125°C 16 TQFN-EP**

5.0

Ordering Information

Ordering Information continued at end of data sheet.

*The package code is T1655-3.

**EP = Exposed pad.

+Denotes lead-free package.

1 2 3 4 5 6 ... 16 17

Indice de contenidos

Pagina 1 - DC-DC Converters

General DescriptionThe MAX5090A/B/C easy-to-use, high-efficiency, high-voltage step-down DC-DC converters operate from aninput voltage up to 76V, and

Pagina 2

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters10 ___________________________________________________________________________

Pagina 3

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________

Pagina 4

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters12 ___________________________________________________________________________

Pagina 5

2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________________ 13M

Pagina 6

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters14 ___________________________________________________________________________

Pagina 7

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________

Pagina 8

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters16 ___________________________________________________________________________

Pagina 9

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConvertersMaxim cannot assume responsibility for use of any circuitry other than circuit

Pagina 10

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters2 ____________________________________________________________________________

Pagina 11

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________

Pagina 12

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters4 ____________________________________________________________________________

Pagina 13

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________

Pagina 14

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters6 ____________________________________________________________________________

Pagina 15

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________

Pagina 16

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters8 ____________________________________________________________________________

Pagina 17 - Package Information

MAX5090A/B/C2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters______________________________________________________________________________

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Rainbow-electronics MAX5090C Manual de usuario

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