AIC6191 datasheet(8/9 Pages) AIC

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AIC6191

 APPLICATION INFORMATION

 Current Limit

Current limiting is invoked when the load exceeds

the set over-current threshold. It protects the

output MOSFET switches from damage resulting

from undesirable short circuit conditions or excess

inrush current, which is often encountered during

hot plug-in.

 Thermal Shutdown

When junction temperature of AIC6191 exceeds

145

C for any reasons, the thermal shutdown

function turns MOSFET switch off. A hysteresis of

C prevents the MOSFETs from turning back on

until the chip temperature drops below 125

C.

thermal shutdown circuit functions only when the

switch is enabled.

 Under-voltage Lockout

UVLO prevents the MOSFET switch from turning

on until input voltage exceeds 2.5V typically. After

the switch turns on, if input voltage drops below

2.3V typically, UVLO shuts off the output MOSFET.

 Supply Filtering

A 0.1

F to 1F bypass capacitor from IN to GND,

located near the device, is strongly recommended

to control supply transients. Without a bypass

capacitor, an output short may cause sufficient

ringing on the input (from supply lead inductance)

damage

internal

control

circuitry.

Input

transients must not exceed the maximum VIN

voltage for a short duration.

 Transient Requirements

USB supports dynamic attachment (hot plug-in) of

peripherals. A current surge is caused by the input

capacitance of downstream device. Ferrite beads

are recommended in series with all power and

ground connector pins. Ferrite beads reduce EMI

and limit the inrush current during hot-attachment

by filtering high-frequency signals.

 Printed Circuit Layout

The power circuitry of USB printed circuit boards

requires a customized layout to maximize thermal

dissipation and to minimize voltage drop and EMI.

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