©2007 Fairchild Semiconductor Corporation

1

www.fairchildsemi.com

FPF2140/42/43/44/46/47 Rev. D

tm

October 2007

FPF2140/42/43/44/46/47

Full Function Load Switch with Reverse Current Blocking

Features

1.8 to 5.5V Input Voltage Range

Controlled Turn-On

200mA and 400mA Current Limit Options

Undervoltage Lockout

Thermal Shutdown

<2µA Shutdown Current

Auto Restart

Fast Current limit Response Time

5µs to Moderate Over Currents

30ns to Hard Shorts

Fault Blanking

Reverse Current Blocking

Power Good Function

RoHS Compliant

Applications

PDAs

Cell Phones

GPS Devices

MP3 Players

Digital Cameras

Peripheral Ports

Hot Swap Supplies

General Description

The FPF2140/42/43/44/46/47 is a series of load switches which

provides full protection to systems and loads which may

encounter large current conditions. These devices contain a

0.12Ω current-limited P-channel MOSFET which can operate

over an input voltage range of 1.8-5.5V. Internally, current is

prevented from flowing when the MOSFET is off and the output

voltage is higher than the input voltage. Switch control is by a

logic input (ON) capable of interfacing directly with low voltage

control signals. Each part contains thermal shutdown protection

which shuts off the switch to prevent damage to the part when a

continuous over-current condition causes excessive heating.

When the switch current reaches the current limit, the part

operates in a constant-current mode to prohibit excessive

currents from causing damage. For the FPF2140/42/44/46, if

the constant current condition still persists after 30ms, the part

will shut off the switch and pull the fault signal pin (FLAGB) low.

The FPF2140/44 have an auto-restart feature which will turn the

switch on again after 450ms if the ON pin is still active. The

FPF2142/46 do not have this auto-restart feature so the switch

will remain off until the ON pin is cycled. For the FPF2143/47, a

current limit condition will immediately pull the fault signal pin

low and the part will remain in the constant-current mode until

the switch current falls below the current limit. The minimum

current limit is 200mA for the FPF2140/42/43 while that for the

FPF2144/46/47 is 400mA.

These parts are available in a space-saving 6 pin 2X2 MLP

package.

Ordering Information

Part

Current Limit

[mA]

Current Limit

Blanking Time

[ms]

Auto-Restart

Time

[ms]

ON Pin

Activity

FPF2140

200/300/400

15/30/60

225/450/900

Active HI

FPF2142

200/300/400

15/30/60

NA

Active HI

FPF2143

200/300/400

0

NA

Active HI

FPF2144

400/600/800

15/30/60

225/450/900

Active HI

FPF2146

400/600/800

15/30/60

NA

Active HI

FPF2147

400/600/800

0

NA

Active HI

BOTTOM

TOP

Pin 1