LPW5202 datasheet(9/14 Pages) POWER

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LPW5202

LPW5202 Rev1.7 June-2022

Function Description

LPW5202 series are current limited switches that protect

systems and loads which can be damaged or disrupted by

the application of high currents. The devices all contain a

70mΩ P-channel MOSFET and a controller capable of

working over a wide input operating range of 2.4V to 6V.

The controller protects against system malfunctions

through current limiting, under-voltage lockout and thermal

shutdown. The current limit is adjustable from 200mA to

2.5A through an external resistor, or fixed value typical

1.35A, 1.6A or 2.35A to allow 1.1A, 1.5A or 2.1A

applications.

Enable control

The EN pin controls the state of the switch. When EN is

pulled high, the load switch is turned on. Activating EN

continuously holds the switch in the on state so long as

there is no fault. For all versions, an under-voltage on IN

or a junction temperature in excess of 150°C overrides the

EN control to turn off the switch. The LPW5202 does not

turn off in response to an over current condition but instead

remains operating in a constant current mode as long as

EN is active and the thermal shutdown or under-voltage

lockout have not activated.

The enable pin

EN’s control voltage and IN pin have

independent recommended operating ranges. The EN pin

voltage can be driven by a voltage level higher than the

input voltage.

Reverse Voltage Protection

The LPW5202 has a reverse voltage protection feature

that protects the input when output voltage is higher than

the input. For a standard USB power design, this is an

important feature to protect the USB host from being

damaged due to the current flow from VBUS.

When the load switch is OFF, no current flows from the

output to the input. If the switch is turned on and VOUT - VIN

is higher than VRVP, this feature is activated and turns off

the switch. This prevents any current flow from output to

input. The reverse voltage protection feature will be

deactivated if the VOUT is smaller than VIN. FLAGB

operation is independent of the reverse voltage protection

and does not report a fault condition if this feature is

activated

Current Limit

The current limit ensures that the current through the

switch doesn't exceed a maximum value while not limiting

at less than a minimum value. The current at which the

parts will limit is fixed (LPW5202F/S) or adjustable through

the selection of an external resistor connected to ISET

(LPW5202A). The LPW5202F have a de-bounce time of

10ms, nominally, for indicator pin. At the end of this time,

the FLAGB will be internally pulled down. As long as the

heavy load condition continued, the LPW5202 will remain

in a constant current state until the EN pin is deactivated

or the thermal shutdown turns-off the switch.

Under-Voltage Lockout

The under-voltage lockout turns-off the switch if the input

voltage drops below the under-voltage lockout threshold.

With the EN pin active, the input voltage rising above the

under-voltage lockout threshold will cause a controlled

turn-on of the switch which limits current over-shoots.

Thermal Shutdown

The thermal shutdown protects the die from internally or

externally generated excessive temperatures. During an

over temperature condition, the switch is turned off. The

switch automatically turns on again if the temperature of

the die drops below the threshold temperature.

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