FPF2125

FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products

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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products

September 2006

FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Features
1.8 to 5.5V Input Voltage Range Controlled Turn-On 0.15-1.5A Adjustable Current Limit Undervoltage Lockout Thermal Shutdown 2uA Shutdown Current Auto Restart Fast Current limit Response Time 3us to Moderate Over Currents 20ns to Hard Shorts Fault Blanking Reverse Current Blocking

General Description
The FPF2123, FPF2124, and FPF2125 are a series of load switches which provide full protection to systems and loads which may encounter large current conditions. These devices contain a 0.125 current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V. The current limit is settable using an external resistor. 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 parts operate in a constant-current mode to prohibit excessive currents from causing damage. For the FPF2123 and FPF2124 if the constant current condition still persists after 10ms, these parts will shut off the switch. The
FPF2123 has an auto-restart feature which will turn the switch on again after 160ms if the ON pin is still active. The FPF2124 does not have this auto-restart feature so the switch will remain off after a current limit fault until the ON pin is cycled. The FPF2125 will not turn off after a current limit fault, but will rather remain in the constant current mode indefinitely. The minimum current limit is 150mA. These parts are available in a space-saving 5 pin SOT23 package

Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies

Typical Application Circuit
TO LOAD VIN VOUT

FPF2123 - FPF2125
OFF ON ON GND ISET

Ordering Information
Current Limit [A]
0.15 - 1.5 0.15 - 1.5 0.15 - 1.5

Part
FPF2123 FPF2124 FPF2125

Current Limit Blanking Time [ms]
5/10/20 5/10/20 Infinite

Auto-Restart Time [ms]
80/160/320 NA NA

ON Pin Activity
Active HI Active HI Active HI

Top Mark
2123 2124 2125

2006 Fairchild Semiconductor Corporation FPF2123-FPF2125 Rev. C4

www.fairchildsemi.com