LTP2884 - ANALOG DEVICES - Datasheet.Live

ltp2884fa

PRODUCT MANUAL LTP2884

Description

USB Isolator

The LT P 2884 is a complete USB isolator solution, ideal

for any application requiring ground isolation, protection

from large common mode voltage variations, or protection

from spikes and surges. Built with convenience in mind,

this robust isolator brings comprehensive protection to

a wide variety of applications without the need for any

configuration or additional software.

At the heart of the LT P 2884 is the LTM2884, an isolated

USB 2.0 compatible µModule

transceiver with isolated

power and automatic USB bus speed selection. Isolator

µModule technology uses coupled inductors and an iso-

lated power transformer to provide 2500VRMS of isolation

between the upstream and downstream USB interface. All

accessible lines on the LT P 2884 carry additional surge

protection and ESD protection up to ±20kV. Uninterrupted

communication is guaranteed for common mode transients

greater than 30kV/µs.

The LTP2884 is compatible with USB 2.0 full speed

(12Mbps) and low speed (1.5Mbps) operation. Automatic

L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

speed selection configures integrated pull-up resistors on

the upstream port to match those sensed on the down-

stream device.

By default, downstream devices are powered

(up to 1W) by the upstream bus through an isolated DC/

DC converter. Optionally, a wall adapter can be used, in-

creasing available power to downstream devices to 2.5W.

The LT P 2884 has additional features which help to ensure

reliable operation. Status LEDs indicate the presence of

auxiliary and USB bus power. Warning LEDs indicate

overcurrent on the upstream bus and undervoltage on

the downstream bus, making it clear when an application

requires auxiliary power. High retention USB connectors

protect against accidental unplugging during operation.

Design files for this circuit board are available at

http://www.linear.com/demo

Features

n 2.5kVRMS Rated Dielectric Isolation Voltage for One

Minute

n USB 2.0 Full Speed and Low Speed Support

n Bus Powered with Optional External Supply

n Hot Plug Protection

n No Drivers or Software Required

n 400VRMS Continuous Working Voltage

n ±20kV ESD Protection

n High Common Mode Transient Immunity

n Small Rugged Enclosure

n LED Status and Warning Indicators

n High Retention USB Connectors

ltp2884fa

PRODUCT MANUAL LTP2884

speciFications

MIN TYP MAX UNITS

Power

Operating Supply Range (Bus Power Mode) 4.4 5 5.5 V

Operating Supply Range (Auxiliary Power Mode) 9.6 12 14.4 V

Regulated Output Voltage 4.75 5 5.25 V

Downstream VBUS Source Current (Bus Power Mode) 200 mA

Downstream VBUS Source Current (Auxiliary Power Mode) 500 mA

USB Interface

Low Speed Data Rate 1.5 Mbps

Full Speed Data Rate 12 Mbps

Protection

Rated Dielectric Insulation Voltage 2500 VRMS

Maximum Continuous Working Voltage (Upstream to Downstream) 560

400

VPEAK

VRMS

Common Mode Transient Immunity 30 kV/µs

ESD Immunity ±20 kV

Mechanical

Dimensions 3.1 × 2.2 × 0.8 in

Weight 51 grams

ltp2884fa

PRODUCT MANUAL LTP2884

connections anD inDicators

Auxiliary 12V DC: Power supply input for support of

>200mA downstream load applications. Power connec-

tor is standard 4mm type with positive center pin. Input

voltage range is 9.6V to 14.4V.

Upstream: High retention USB type B connector.

Connect with a standard USB cable to a computer or USB

host.

Downstream: High retention USB type A connector. Con-

nect with a standard USB cable to any USB 2.0 full speed

or low speed peripheral.

LED Indicators

VBUS: Green LED indicates the presence of VBUS voltage

on the upstream bus.

12V: Green LED indicates the presence of voltage on the

12V Auxiliary power input.

ILIM: Red LED shows when current on the up-stream VBUS

is near or exceeds the maximum allowed to guarantee

proper regulation of the downstream VBUS. If this LED is

on, the LT P 2884 needs to be powered from the 12V wall

adapter for the current application, increasing available

downstream power.

GOOD: This green LED indicates that the downstream

VBUS is above the minimum operating voltage of 4.75V.

LOW: This red LED indicates that downstream VBUS has

dropped below 4.75V. If on, it is an indicator that the current

load of the downstream device is too high for the current

configuration: >200mA for bus powered applications or

>500mA for 12V powered applications.

Note: 1. In bus powered hub applications the available

downstream current is limited to 100mA. The LT P 2884

would only be able to supply a few mA on its downstream

side if connected to a bus powered hub.

ltp2884fa

PRODUCT MANUAL LTP2884

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 4 C1, C2, C3, C5 CAP, CHIP, X7R, 0.1µF, 5% , 50V, 0603 AVX, 06035C104JAT2A

2 1 C4 CAP, TANT, 100µF, 10V, 20%, C AVX, TPSC107M010R0150

3 3 D5, D6, D8 LED, GREEN, SMD, 0805 KINGBRIGHT, APT2012ZGC

4 2 D7, D9 LED, RED, SMD, 0805 KINGBRIGHT, CRCW06031R00JNEA

5 3 F1, F2, F3 PTC RESETABLE FUSE, 1.10A, 6V, 1206 BOURNS, MF-NSMF110-2

6 1 J1 USB-B RECEPTACLE, HIGH RETENTION SAMTEC, USBR-B-S-S-O-TH

7 1 J2 POWER RECEPTABLE, 2mm x 6mm CUI INC, PJ-047AH

8 1 J3 USB-A RECEPTACLE, HIGH RETENTION SAMTEC, USBR-A-S-S-O-TH

9 1 Q1 MOSFET, N-CH 30V 5.1A SC70-6 VISHAY, SI1470DH-T1-E3

10 1 Q2 MOSFET, P-CH 30V 2.7A SC70-6 VISHAY, SI1471DH-T1-E3

11 1 Q3 MOSFET, N-CH D-S 30V 8-SOIC VISHAY, SI4214DDY-T1-GE3

12 2 R1, R9 RES, CHIP, 1Ω, 5%, 1/10W, 0603 VISHAY, CRCW06031R00JNEA

13 1 R2 RES, CHIP, 1.15k, 1%, 1/10W, 0603 VISHAY, CRCW06031K15FKEA

14 1 R3 RES, CHIP, 4.42k, 1%, 1/10W, 0603 VISHAY, CRCW06034K42FKEA

15 1 R4 RES, CHIP, 5.62k, 1%, 1/10W, 0603 VISHAY, CRCW06035K62FKEA

16 1 R5 RES, CHIP, 169k, 1%, 1/10W, 0603 VISHAY, CRCW0603169KFKEA

17 1 R6 RES, CHIP, 19.6k, 1%, 1/10W, 0603 VISHAY, CRCW060319K6FKEA

18 1 R7 RES, CHIP, 100k, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA

19 3 R8, R10, R13 RES, CHIP, 3.65k, 1%, 1/10W, 0603 VISHAY, CRCW06033K65FKEA

20 1 R11 RES, CHIP, 0.1Ω, 1%, 1/4W, 0805 VISHAY, WSL0805R1000FEA18

21 1 R12 RES, CHIP, 100Ω, 1%, 1/10W, 0603 VISHAY, CRCW0603100RFKEA

22 6 TVS1 TO 3, 5 TO 7 DIODE TVS ARRAY, 5V, SOD323 BOURNS, CDSOD323-T05

23 1 TVS4 DIODE TVS ARRAY, 12V, SOD323 BOURNS, CDSOD323-T12

24 1 U1 IC, LTC4360-2 LINEAR LTC4360ISC8-2#PBF

25 1 U2 IC, LTC4412 LINEAR LTC4412IS6#PBF

26 1 U3 IC, LTC6108-2 LINEAR LT6108IMS8-2#PBF

27 1 U4 IC, LTC4365 LINEAR LTC4365ITS8-2#PBF

28 1 U5 IC, LTM2884 LINEAR LTM2884IY

29 1 U6 IC, LTC2906 LINEAR LTC2906ITS8#PBF

30 1 LIGHTPIPE LUMEX, LPA-C081301S-10

Optional Components

31 1 WALL ADAPTER, 12VDC. 7.2W VOLGEN, KTPS05-12006U

ltp2884fa

PRODUCT MANUAL LTP2884

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

schematic Diagram

ltp2884fa

PRODUCT MANUAL LTP2884

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0514 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

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If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

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