FP6863 datasheet(7/10 Pages) FITIPOWER

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FP6863-1.2-FEB-2012

FP6863

85T

fitipower integrated technology lnc.

Functional Description

The FP6863 is a single, current-limited switch

designed for high-side load-switching applications.

It has one switch with enable control input.

The

switch has a moderate turn on slew rate feature,

which reduces inrush current when the MOSFET is

turned on.

The FP6863 operates from 2.0V to 5.5V input

voltage range and guarantees a minimum 1.5A

output current.

Independent current limit and

thermal shutdown circuit permit the switch to operate

independently and improve system robustness.

Input and Output

VIN is the power source connection to the internal

circuitry and the drain of the MOSFET.

VOUT is the

source of the MOSFET.

In normal application,

current flows through the switch from VIN to VOUT

toward the load.

If VOUT is greater than VIN,

current will flow from VOUT to VIN and cause the

MOSFET bidirectional.

There is no parasitic body

diode between drain and source of the MOSFET.

The FP6863 will prevent reverse current flow if

VOUT externally forced a higher voltage than VIN

when the device is disabled (VEN < 0.8V).

FP6863

Normal MOSFET

Under Voltage Lockout

Under voltage-lockout (UVLO) circuit prevents the

output switch from turning on until input voltage

exceeds approximately 1.8V.

Chip Enable Input

The switch will be disabled when the EN pin is

under logic low condition.

During this condition,

the internal circuitry and MOSFET will be turned off,

and reduce the supply current to 0.1

μA typical.

The maximum guaranteed voltage for logic low at

the EN pin is 0.8V.

A 2V minimum guaranteed

voltage at the EN pin will turn the FP6863 on.

Floating the EN input may cause unpredictable

operation.

Current Limiting and Short-Circuit Protection

The current limit circuitry prevents damage to the

MOSFET switch and the hub downstream port but

can deliver load current up to the current limit

threshold of minimum 1.5A through the switch of

FP6863.

When a heavy load or short circuit is

applied and a large transient current exceeds the

current limit threshold, the FP6863 will enter short

circuit protection to fold back the output current to

1.35A in typical until the fault is removed.

Shutdown Output Discharge

The FP6863 has a shutdown output discharge

circuit to rapidly turn off the output load when the

switch is disabled through the EN pin.

Thermal Shutdown

Thermal shutdown is employed to protect the device

from damage when the die temperature exceed safe

margins mainly due to short-circuit or current-limit.

Thermal shutdown function will shut off the switch if

the die temperature reaches 130ºC.

The power

switch will auto-recover when the IC is cooling

down.

The thermal hysteresis temperature is

about 20ºC.

FP6863 Datasheet(PDF) 7 Page - Fitipower Integrated Technology Inc.

FP6863 Datasheet(HTML) 7 Page - Fitipower Integrated Technology Inc.

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