FP6862ASOGTR datasheet(10/11 Pages) FITIPOWER

10 / 11 page

FP6862-1.6-JUN-2012

FP6862

85T

fitipower integrated technology lnc.

Application Information

The FP6862 is a dual, current-limited switch

designed

for

USB

applications.

has

two

independent switches, each with its own enable

control input.

Each switch has an error-flag output

to notify the USB controller when the current-limit,

short-circuit, under voltage lockout (UVLO) or

thermal shutdown occurs.

The FP6862 operates from 2.7V to 5.5V input

voltage range and guarantees a minimum 1A output

current.

Independent current-limit and thermal

shutdown circuits permit each switch to operate

independently, improving system robustness.

UVLO and Input-Voltage Requirement

Under Voltage Lockout (UVLO) circuit prevents the

output switch from turning on until input voltage

exceeds approximately 2.5V.

Reverse Current Blocking

The USB specification does not allow an output

device to source current back into the USB port.

However, the FP6862 are designed to safely power

noncompliant devices. When disable, each output is

switched

high-impedance

state,

blocking

reverse current flow from the output back to the

input.

The switch is bi-directional when enable.

Error Flag

The FP6862 provides an open drain error flag output

for each switch.

For most applications, connect

FLG and IN through a 10k

Ω pull-up resistor. FLG

goes low when any following conditions occur:

1. The input voltage is below the UVLO threshold.

2. The thermal shutdown occurs.

3. The switch is in current-limit and short-circuit

conditions.

Supply Filtering

A 0.1

μF to 1µF bypass capacitor positioned close to

VIN

and

GND

the

FP6862

strongly

recommended

control

supply

transients.

Without a bypass capacitor, an output short may

cause sufficient ringing on the input to damage

internal control circuitry.

Error Flag

An error flag is an open-drain output of an N-

channel MOS.

Flag output is pulled low to signal

the following fault conditions: Supply voltage under

UVLO threshold voltage, current limit, short circuit

or thermal shutdown.

Current Limit

The current limit threshold is preset internally.

protects the output switch from damage due to

undesirable short circuit conditions or excess inrush

current often encountered during hot plug-in.

Thermal Shutdown

Thermal shutdown is employed to protect the

device from damage when the die temperature

exceeds safe margins mainly due to short-circuit

or current-limit.

FP6862 features independent

thermal

shutdown

for

each

switch

channel,

allowing one switch to deliver power even if the

other switch has a fault condition.

Thermal

shutdown shuts off the output switch which in

current-limit or short-circuit and asserts the FLG

output if the die temperature reaches 140°C and

the other channel is not affected.

However, if the

die temperature exceeds 160°C, both channels

will be shut off.

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