MAX20044F [MAXIM]

Passes 480Mbps USB Data Signals;


型号：	MAX20044F
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Passes 480Mbps USB Data Signals
文件：	总7页 (文件大小：309K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

General Description

Quick Start

The MAX20044F evaluation kit (EV kit) circuit demon-

strates the MAX20044F automotive USB protector switch

IC, featuring overvoltage protection (OVP), electrostatic

discharge (ESD) protection, and undervoltage lockout

(UVLO)/overcurrent protection (OCP) for automotive

USB applications.

Required Equipment

●

MAX20044F EV kit

5V, 2A DC power supply (supply A)

18V, 2A DC power supply (supply B)

Logic function generator

Oscilloscope

The IC protects the USB BUS, D+, and D- data lines from

overvoltage conditions, such as a short-to-battery and

ESD events. UVLO protects the BUS against low-voltage

conditions such as a short-to-ground. The BUS OCP uses

a blanking period allowing momentary BUS shorts to be

ignored. All faults can be monitored using the FAULT

output signal.

Procedure

The EV kit is fully assembled and tested. Follow the

steps below to verify board operation. Caution: Do not

turn on the power supplies until all connections are

completed.

The IC can pass high-speed USB differential (D+ and D-)

1) Verify that shunts are installed as follows:

signals up to 480Mbps and has a low 90mΩ R

ON(MAX)

●

JU1: Pins 1-2 (MAX20044F switches disabled)

for the BUS and a 4Ω R

) for the D+ and D-

ON(TYP)

JU2: Pins 1-2 (IN connected to on-board 3.3V

reference)

lines. The EV kit is powered by the USB BUS. An on-

board MAX15007A automotive regulator provides the IN

reference voltage. The MAX20044F EV kit can also evalu-

ate the MAX20042F and MAX20043F after IC replace-

ment of U1.

2) Set the supply A output to 5V, the supply B output to

18V, and disable both outputs.

3) Set the logic function generator as follows: 3V

P-P

1.5V DC offset square wave, 500kHz, and disable the

output.

Features

● Protects USB BUS, D+, and D- Signals from

4) Connect the supply A positive output to the red BUS

test point on the EV kit and connect the supply ground

to the nearby black GND test point.

Overvoltages Up to 18V and ESD Events

● USB BUS Undervoltage Lockout

● 1.3A (typ) USB BUS Overcurrent-Protection

5) Connect the supply B ground to the GND test point

close to the HVBUS test point on the EV kit. Connect

a voltage probe test lead to the supply B positive out-

put for later use.

Threshold

● 1ms Overcurrent Blanking Time

● Passes 480Mbps USB Data Signals

6) Connect the logic function generator output to the

white D+ test point and the ground to the black

SHIELD test point.

● Low On-Resistance

• BUS: 0.14mΩ (max)

• D+ and D-: 4Ω (typ)

7) Enable both power-supply outputs.

8) Enable the function generator output.

● FAULT Output Signal

● USB Powered

● Fully Assembled and Tested

Ordering Information appears at end of data sheet.

● Evaluates the MAX20042F, MAX20043F, and

MAX20044F ICs in a 16-Pin QSOP Package

19-7705; Rev 2; 2/17

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

9) Install a shunt on jumper JU1, pins 2-3 (MAX20044F

switches enabled).

Long USB wire lengths contribute to increased wiring

inductance, resulting in slow di/dt and dV/dt during a

“short to 18V” event. The IC includes internal circuitry that

switches off the switch between the HVBUS and BUS

during an overvoltage on the HVBUS for these long USB

wire conditions. Energy stored in the wiring inductance

can cause the HVBUS node to quickly increase. Zener

diode D1 clamps this ﬂyback voltage, absorbing the

energy in wiring inductance.

10) Use the oscilloscope to probe the HVBUS and HVD+

test points.

11) Verify that HVBUS is 5V and that the waveform on

HVD+ is a 500kHz square wave and is approximately

P-P

12) Momentarily touch the HVBUS test point on the EV

kit with the voltage probe from the supply B positive

output. The FAULT signal asserts a logic-low while

the fault is present.

Jumper Settings

Bus and Data Switch Enable (JU1)

Jumper JU1 on the EV kit enables the IC’s BUS and

data switches. PCB pads EN and GND are provided to

control U1’s enable signal with an external controller.

Refer to the Electrical Characteristics EN Input section

in the MAX20042F–MAX20044F IC data sheet for proper

EN logic levels when using an external controller. See

Table 1 for proper JU1 jumper settings.

Detailed Description of Hardware

The MAX20044F EV kit circuit demonstrates the

MAX20044F automotive USB protector switch IC,

featuring OVP, ESD protection, UVLO protection, and

OCP for automotive USB applications.

The IC protects the USB BUS, D+, and D- data lines from

overvoltage conditions, such as a short-to-battery up to

18V and ESD events up to 15kV (air) and 8kV (contact).

The OVP feature protects the D+ and D- lines against

high-voltage conditions such as a short-to-BUS. The

UVLO feature protects the BUS line against low-voltage

conditions such as a short-to-ground. The BUS OCP

threshold is ﬁxed at 1.3A (typ). A 1ms blanking period

allows momentary BUS shorts to be ignored, such as

those created by hot-swapping a capacitive load. All faults

can be monitored using the FAULT PCB pad, pulled up to

IN through resistor R1.

IN Reference Voltage Selection (JU2)

Jumper JU2 on the EV kit selects the reference voltage

for the IC’s IN pin. IN can either be supplied by the USB

BUS through the on-board automotive 3.3V regulator (U2,

MAX15007A), or by a user-supplied reference voltage.

PCB pads VIN and GND are provided to supply the IC

with an external 3V to 3.6V reference voltage. See Table

2 for proper JU2 jumper settings.

Evaluating the MAX20042F and MAX20043F

The MAX20044F EV kit can also evaluate the MAX20042F

and MAX20043F. Remove the MAX20044F (U1) and

replace it with the desired device. The MAX20042F and

MAX20043F are pin compatible with the MAX20044F.

Refer to the MAX20042F–MAX20044F IC data sheet for

additional information.

The IC can pass high-speed USB differential (D+ and D-)

signals up to 480Mbps, and has a low 90mΩ R

ON(MAX)

for BUS and a 4Ω R

for the D+ and D- data

ON(TYP)

lines. The EV kit is powered by the USB BUS. The 3.3V

automotive regulator (U2, MAX15007A) provides an on-

board IN reference voltage. A user can provide a 3V to

3.6V IN reference voltage across the VIN and GND PCB

pads. The MAX20044F (U1) IC’s automotive operating

temperature range is from -40°C to 105°C.

Optional Common-Mode Choke

PCB pads are provided on the EV kit for an optional

common-mode choke (L1). Cut the traces shorting L1’s

PCB pads before installing a choke.

Table 1. MAX20044F Enable (JU1)

Table 2. MAX20044F IN Reference Voltage

Selection (JU2)

SHUNT

MAX20044F

SWITCHES

EN PIN

POSITION

1-2

2-3

Connected to IN

Disabled

Enabled

SHUNT

POSITION

EV KIT

FUNCTION

IN PIN

Connected to GND

Connected to the

on-board 3.3V regulator

On-board reference

provided by U2

Not

installed

Connected to EN

PCB pad

EN externally

controlled

1-2

2-3

Connected to the VIN

PCB pad

External 3V to 3.6V

reference

Maxim Integrated

│ 2

www.maximintegrated.com

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

Component List

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

0.1μF ±10%, 25V X7R ceramic

capacitor (0603)

Murata GRM188R71E104K

20V, 500mW zener diode

(SOD123)

Fairchild MMSZ5250B

Not installed, ceramic capacitor

Black multipurpose test points

Keystone 5011

GND1, GND2

HVBUS, BUS

J1, J2

3.3μF ±10%, 16V X7R ceramic

capacitors (0805)

Murata GRM21BR71C335K

Red multipurpose test points

Keystone 5010

C3, C4

USB type-A receptacles

Assmann AU-Y1006-R

0.1μF ±10%, 16V X7R ceramic

capacitors (0603)

Murata GRM188R71C104K

C5, C7

3-pin headers, 2.54mm

Sullins PEC36SAAN

JU1, JU2

10μF ±20%, 25V X7R ceramic

capacitor (0805)

Murata GRM219R61E106KA12D

Optional common-mode choke

12nH inductors

Murata LQW15AN12NJ00D

L4, L5

100μF ±20%, 6.3V X7S ceramic

capacitor (1210)

Murata GRM32EC80J107M

4.7nH inductors

Murata LQW15AN4N7D00D

L6, L7

100kΩ ±5% resistors (0603)

10μF ±20%, 25V X7R ceramic

capacitor (1210)

TDK C3225X7R1E106M

R1, R2

USB automotive protector

(16 QSOP)

Maxim MAX20044FEGEEA/V+

6pF ±0.1pF, 50V C0G NP0

ceramic capacitors (0402)

Murata GRM1555C1H6R0BZ01D

C14, C15

C16, C17

3.3V automotive regulator

(8 SO-EP*)

Maxim MAX15007AASA+

2pF ±0.1pF, 50V C0G NP0

ceramic capacitors (0402)

Murata GRM1555C1H2R0BZ01D

Shunts

Kycon SX1100-B

—

PCB: MAX20044 EVALUATION

KIT#

/V denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Maxim Integrated

│ 3

www.maximintegrated.com

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

Figure 1. MAX20044F EV Kit Schematic

Maxim Integrated

│ 4

www.maximintegrated.com

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

Figure 2. MAX20044F EV Kit—Component Side

Figure 3. MAX20044F EV Kit PCB Layout—Component Side

Figure 4. MAX20044F EV Kit PCB Layout—Layer 2

Maxim Integrated

│ 5

www.maximintegrated.com

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

Figure 5. MAX20044F EV Kit PCB Layout—Layer 3

Figure 6. MAX20044F EV Kit PCB Layout—Solder Side

Ordering Information

PART

TYPE

MAX20044EVKIT#

#Denotes RoHS compliant.

EV Kit

Maxim Integrated

│ 6

www.maximintegrated.com

Evaluates: MAX20042F/

MAX20043F/MAX20044F

MAX20044F Evaluation Kit

Revision History

REVISION

NUMBER

REVISION

DATE

PAGES

CHANGED

DESCRIPTION

7/15

Initial release

—

Changed part numbers from MAX20042, MAX20043, and MAX20044 to

MAX20042F, MAX20043F, and MAX20044F

12/16

1–7

Changed ordering part number in Ordering Information from MAX20044FEVKIT#

to MAX20044EVKIT#

2/17

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and speciﬁcations without notice at any time.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

2017 Maxim Integrated Products, Inc.

│ 7

MAX20044F [MAXIM]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E