LTM2884

1

Rev. D

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Isolated USB Transceiver with Isolated Power

The LTM®2884 is a complete galvanically isolated USB

2.0 compatible μModule® (micromodule) transceiver.

An upstream supply powers both sides of the interface

through an integrated, isolated DC/DC converter.

The LTM2884 is ideal for isolation in host, hub, bus split-

ter or peripheral device applications. It is compatible with

USB 2.0 full speed (12Mbps) and low speed (1.5Mbps)

operation. Automatic speed selection configures inte-

grated pull-up resistors on the upstream port to match

those sensed on the downstream device.

The isolator µModule technology uses coupled induc-

tors and an isolated power transformer to provide isola-

tion between the upstream and downstream USB inter-

face. This device is ideal for systems requiring isolated

ground returns or large common mode voltage variations.

Uninterrupted communication is guaranteed for common

mode transients greater than 30kV/μs.

Enhanced ESD protection allows this part to withstand

up to ±15kV (human body model) on the USB transceiver

interface pins to local supplies and ±15kV through the

isolation barrier to supplies without latch-up or damage.

Powered 2.5W Isolated Hub Port

APPLICATIONS

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LTM2884: 2500VRMS for 1 Minute

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LTM2884(a): 3000VRMS for 1 Minute

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LTM2884: UL Recognized

File #E151738

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LTM2884(a): CSA Recognized

File #255632

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USB 2.0 Full Speed and Low Speed Compatible

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Integrated Isolated DC/DC Converter, External or

Bus Powered

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Auto-Configuration of Bus Speed

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2.5W (500mA at 5V) Output Power from External

Input Supply (VCC = 8.6V to 16.5V)

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1W (200mA at 5V) Output Power from USB Bus

Supply (VBUS)

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3.3V LDO Output Supply Signal References VLO, VLO2

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High Common Mode Transient Immunity: 30kV/μs

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ESD: ±15kV HBM on USB Interface Pins

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15mm × 15mm × 5mm Surface Mount BGA Package

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Isolated USB Interfaces

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Host, Hub, or Device Isolation

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Industrial/Medical Data Acquisition

Bus Powered 1W Isolated Peripheral Device

2884 TA01a

VLO

LTM2884

500mA AT 5V

ON

4.4V TO 16.5V

VBUS

VBUS2

8.6V TO 16.5V

100µF

VCC

SPNDPWR

D1+

D1–

VCC2

VLO2

D2+

DOWNSTREAM

USB PORT

D2–

GND2

GND

15k

15k

+

PWR

HUB

µC

2884 TA01b

VLO

ON

SPNDPWR

VCC2

VBUS

VBUS

GND

GND2

GND

UPSTREAM

USB PORT

VCC

LTM2884

200mA AT 5V

D1+

PERIPHERAL

D1–

VLO2

D2+

D2–

PWR

1.5k

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