UCS81003 datasheet(23/108 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS20005334A-page 23

UCS81003

5.0

GENERAL DESCRIPTION

The UCS81003 provides a single USB port power

switch for precise control of up to 3.0A continuous

current with overcurrent limit (OCL), dynamic thermal

management, latch or auto-recovery fault handling,

selectable active-low or -high enable, under and

overvoltage lockout, and back-voltage protection.

Split supply support for VBUS and VDD is an option for

low power in system standby states.

In addition to power switching and current limiting, the

UCS81003

provides

automatic

and

configurable

charger emulation profiles to charge a wide variety of

portable devices, including USB-IF BC1.2 (CDP or

DCP modes), YD/T-1591 (2009), 12W charging, most

Apple and RIM portable devices and many others.

The UCS81003 also provides current monitoring to

allow 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 that need to

provide power without excessively draining the battery,

that

require

power

allocation

depending

application activities.

Figure 5-1 shows a UCS81003 full-featured system

configuration in which the UCS81003 provides a port

power switch and low-power Attach Detection with

wake-up signaling (wake on USB). The current limit is

established at power-up. It can be lowered if required

after power-up via the SMBus/I2C. This configuration

also provides configurable USB data line-charger

emulation,

programmable

current

limiting

(as

determined by the accepted charger emulation profile),

active current monitoring and port charge rationing.

FIGURE 5-1:

UCS81003 System Configuration (with Charger Emulation, SMBus Control and USB

Host).

UCS81003

ALERT#

–5.5V

Device

DPOUT

DMOUT

VS1

VS2

A_DET#

5V Host

CBUS

USB Host

–5.5V

CIN

VDD

DPIN

DMIN

VDD

EM_EN

PWR_EN

SMDATA

SMCLK

SEL

COMM_SEL

/ILIM

GND

VDD

VS3

VBUS1

VBUS2

VBUS3

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