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UCS81003

Features

•Port Power Switch with Two Current Limit Behaviors

-2.9V to 5.5V Source Voltage Range

-Up to 3.0A Current (2.85A typical) with

55 m on Resistance

-Overcurrent Trip or Constant Current Limiting

-Soft Turn-On Circuitry

-Programmable Current Limit

-Dynamic Thermal Management

-Undervoltage and Overvoltage Lockout

-Back-Drive, Back-Voltage Protection

-Latch or Auto-Recovery (Low Test Current)

Fault Handling

-Selectable Active-High or Active-Low Power

Switch Enable

-BC1.2 VBUS Discharge Port Renegotiation

Function

•Selectable/Automatic Cycling of Universal Serial

Bus (USB) Data Line Charger Emulation Profiles

-USB-IF BC1.2 Charging Downstream Port

(CDP) and Dedicated Charging Port (DCP)

modes, Chinese Telecommunications Industry

Standard YD/T 1591-2009 and most Apple

®

Inc. and RIM® Protocols Standard; others as

defined via the SMBus 2.0/I

2C Protocol

-Supports 12W Charging Emulation

-USB 2.0 Compliant High-Speed Data Switch

(in Data Pass-Through, SDP and CDP modes)

-Nine Preloaded Charger Emulation Profiles

for Maximum Compatibility Coverage of the

Peripheral Devices

-One Custom-Programmable Charger

Emulation Profile for Portable Device Support

for Fully Host-Controlled Charger Emulation

•Supports Active Cables

•Self-Contained Current Monitoring and Rationing

for Power-Allocation Applications

•Low-Power Attach Detection and Open-Drain

(A_DET#) Pin

•Ultra Low-Power Sleep State

•Optional Split Supply Support for VSand VDD for

Low-Power in System Standby States

•Wake on Attach USB

•SMBus 2.0/I2C Communications

-Supports Block Write and Read

-Multiple SMBus Addresses

•Wide Operating Temperature Range: -40°C to +85°C

•IEC61000-4-2 8/15kV Electrostatic Discharge

(ESD) Immunity

•Passes Automotive AEC-Q100 Reliability Testing

General Description

The UCS81003 provides a USB port power switch for

precise control of up to 3.0A continuous current

(2.85Atypical) with Overcurrent Limit (OCL), dynamic

thermal management, latch or auto-recovery (low-test

current) fault handling, selectable active-low or active-

high enable, undervoltage and overvoltage lockout,

back-drive protection and back-voltage protection.

Split supply support for VS and VDD is an option for low

power in system standby states. This gives battery-

operated applications (such as on-board computers)

the ability to detect attachments from a Sleep or OFF

state. After the Attach Detection is flagged, the system

can decide to wake-up or provide charging, or both.

In addition to Power Switching and Current Limiting

modes, the UCS81003 automatically charges a wide

variety of portable devices, including USB-IF BC1.2,

YD/T-1591 (2009), most Apple Inc. and RIM, and many

others. Nine preloaded charger emulation profiles

maximize the compatibility coverage of the peripheral

devices. Additionally, a customizable charger

emulation profile is available to accommodate unique

existing and future portable device

handshaking/signature requirements.

The UCS81003 also provides current monitoring to

enable intelligent management of system power and

charge rationing for controlled delivery of current,

regardless of the host power state. This is especially

important for battery-operated applications to provide

power and not to excessively drain the battery.

The UCS81003 is available in a 5 mm x 5 mm

28-pin VQFN package.

The UCS81003 is AEC-Q100 qualified for automotive

applications.

Applications

•DC Power Socket Replacement

•Consumer USB Port Protection

•Consumer Device Charging Port

•Auxiliary Box Charging Feature

•Rear Seat Entertainment Consumer Access Point

Automotive USB Port Power Controller with Charger Emulation

Product specificaties