Rainbow-electronics MAX4987BE Manual de usuario descargar pdf (Pagina 1)

General Description

The MAX4987AE/MAX4987BE are overvoltage protection

devices with built-in ESD protection for USB data lines.

These devices feature a low 100mΩ (typ) R

internal

nFET switch and protect low-voltage systems against volt-

age faults up to +28V. When the input voltage exceeds

the overvoltage threshold or decreases below the under-

voltage threshold, the internal nFET switch is turned off to

prevent damage to the protected components.

All switches feature a minimum 1.5A current-limit pro-

tection. During a short-circuit occurrence, the switch

operates in an autoretry mode where the internal nFET

switch is turned on to check if the fault has been

removed. The autoretry interval is 30ms, and if the fault

is removed, the nFET switch remains on.

The MAX4987AE/MAX4987BE feature low-capacitance

(3pF) ESD protection for USB data lines that allow

transmission of high-speed USB 2.0 signals.

The overvoltage threshold (OVLO) is preset to 6.15V.

The undervoltage thresholds (UVLO) are preset to 2.55V

(MAX4987AE) or 4.2V (MAX4987BE). When the input

voltage drops below the undervoltage (UVLO) thresh-

old, the devices enter a low-current standby mode.

All devices are offered in a small 2mm x 3mm, 8-pin

TDFN package and operate over the -40°C to +85°C

extended temperature range.

Applications

Cell Phones

Media Players

Features

o Input Voltage Protection Up to +28V

o Integrated Low R

(100mΩ) nFET Switch

o Internal Overcurrent Protection 1.5A (min)

o Overcurrent Protection (Autoretry)

o Enable Input

o Internal 30ms Startup Delay

o Low-Capacitance USB High-Speed Data Line ESD

Protection (3pF)

±15kV Human Body Model

±15kV IEC 61000-4-2 Air Gap

±6kV IEC 61000-4-2 Contact

o Thermal-Shutdown Protection

o 2mm x 3mm, 8-Pin TDFN Package

MAX4987AE/MAX4987BE

Overvoltage-Protection Controller

with USB ESD Protection

________________________________________________________________

Maxim Integrated Products

Ordering Information/Selector Guide

19-1059; Rev 0; 11/07

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.

Note: All devices are specified over the -40°C to +85°C operating temperature range.

Denotes a lead-free package.

Future product—contact factory for availability.

EP = Exposed paddle.

Typical Operating Circuit appears at end of data sheet.

PART

PIN-

PACKAGE

TOP MARK

PACKAGE

CODE

UVLO (V) OVLO (V)

OVERCURRENT

MODE

MAX4987AEETA+ 8 TDFN-EP** AAI T823-1 2.55 6.15 Autoretry

MAX4987BEETA+* 8 TDFN-EP** AAJ T823-1 4.2 6.15 Autoretry

Pin Configuration

134

865

OUT

MAX4987AE/

MAX4987BE

*CONNECT EXPOSED

PAD TO GND.

GND CD-CD+

TDFN-EP

2mm x 3mm

TOP VIEW

ENACOK

*EP

1 2 3 4 5 6 7 8 9 10

MAX4987AE/MAX4987BE 1

Indice de contenidos

Pagina 1 - MAX4987AE/MAX4987BE

General DescriptionThe MAX4987AE/MAX4987BE are overvoltage protectiondevices with built-in ESD protection for USB data lines.These devices feature a l

Pagina 2

MAX4987AE/MAX4987BEOvervoltage-Protection Controllerwith USB ESD ProtectionMaxim cannot assume responsibility for use of any circuitry other than circ

Pagina 3

MAX4987AE/MAX4987BEOvervoltage-Protection Controllerwith USB ESD Protection2 _________________________________________________________________________

Pagina 4

MAX4987AE/MAX4987BEOvervoltage-Protection Controllerwith USB ESD Protection___________________________________________________________________________

Pagina 5

MAX4987AE/MAX4987BEOvervoltage-Protection Controllerwith USB ESD Protection4 _________________________________________________________________________

Pagina 6

MAX4987AE/MAX4987BEOvervoltage-Protection Controllerwith USB ESD Protection___________________________________________________________________________

Pagina 7

MAX4987AE/MAX4987BEDetailed DescriptionThe MAX4987AE/MAX4987BE are overvoltage protec-tion devices with integrated ESD protection for USBdata lines. T

Pagina 8

Overvoltage Lockout (OVLO)The MAX4987AE/MAX4987BE have a 6.15V (typ) over-voltage threshold (OVLO). When VINis greater thanVOVLO, ACOK is high impedan

Pagina 9

MAX4987AE/MAX4987BEare specified for ±15kV Air-Gap Discharge and ±6kVContact Discharge IEC 61000-4-2 on the CD+ and CD-pins.The major difference betwe

Pagina 10

MAX4987AE/MAX4987BEOvervoltage-Protection Controllerwith USB ESD Protection___________________________________________________________________________

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