FPF2100 ONSEMI | Alldatasheet
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©2008 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FPF2100-FPF2107 Rev. H FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products tm August 2008 FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products
Features
1.8 to 5.5V Input Voltage Range Controlled Turn-On 200mA and 400mA Current Limit Options Undervoltage Lockout Thermal Shutdown <1µA Shutdown Current Auto restart Fast Current limit Response Time 3µs to Moderate Over Currents 20ns to Hard Shorts Fault Blanking RoHS Compliant
Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies General Description The FPF2100 through FPF2107 is a family of load switches which provide full protection to systems and loads which may encounter large current conditi ons. These devices contain a 0.125Ω current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V. 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 FPF2100-FPF2102 and FPF2104-FPF2106, if the constant current condition still persists after 10ms, these parts will shut off the switch and pull the fault signal pin (FLAGB) low. The FPF2100, FPF2101, FPF2104 and FPF2105, have an auto-restart feature which will turn the switch on again after 160ms if the ON pin is still active. The FPF2102 and FPF2106 do not have this auto-restart feature so the switch will remain off until the ON pin is cycled. For the FPF2103 and FPF2107, 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. For the FPF2100 through FPF2103, the minimum current limit is 200mA while that for the FPF2104 through FPF2107 is 400mA. These parts are available in a space-saving 5 pin SOT23 package.
Ordering Information
[mA] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2100 200 10 160 Active HI 2100 FPF2101 200 10 160 Active LO 2101 FPF2102 200 10 NA Active HI 2102 FPF2103 200 0 NA Active HI 2103 FPF2104 400 10 160 Active HI 2104 FPF2105 400 10 160 Active LO 2105 FPF2106 400 10 NA Active HI 2106 FPF2107 400 0 NA Active HI 2107
2 www.fairchildsemi.com FPF2100-FPF2107 Rev. H FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products Typical Application Circuit Functional Block Diagram Pin Configuration Pin Description Pin Name Function 1V IN Supply Input: Input to the power switch and the supply voltage for the IC
2 GND Ground
3 ON ON Control Input
4 FLAGB Fault Output: Active LO, open drain output which indicates an over current supply,
under voltage or over temperature state. 5V OUT Switch Output: Output of the power switch OFF ON ON VIN GND FPF2100 - FPF2107 FLAGB VOUT TO LOAD UVLO THERMAL SHUTDOWN CURRENT LIMIT CONTROL LOGIC VIN ON VOUT FLAGB GND VIN GND ON FLAGB VOUT SOT23-5
3 www.fairchildsemi.com FPF2100-FPF2107 Rev. H FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products Absolute Maximum Ratings Recommended Operating Range
Electrical Characteristics
VIN, VOUT, ON, FLAGB to GND -0.3 6 V Power Dissipation @ TA = 25°C (note 1) 667 mW Operating Junction Temperature -40 125 °C Storage Temperature -65 150 °C Thermal Resistance, Junction to Ambient 150 °C/W Electrostatic Discharge Protection HBM 4000 V MM 400 V Parameter Min Max Unit VIN 1.8 5.5 V Ambient Operating Temperature, TA -40 85 °C Parameter Symbol Conditions Min Typ Max Units Basic Operation Operating Voltage V IN 1.8 5.5 V Quiescent Current I Q IOUT = 0mA V IN = 1.8 to 3.3V 95 µA VON active V IN = 3.3 to 5.5V 110 200 Shutdown Current I SHDN 1µ A Latch-Off Current (note 2) I LATCHOFF VON = VIN, after an overcurrent fault 50 µA On-Resistance R ON VIN = 3.3V, IOUT = 50mA, TA = 25°C 125 160 mΩVIN = 3.3V, IOUT = 50mA, TA = 85°C 150 200 VIN = 3.3V, IOUT = 50mA, TA = -40°C to +85°C 65 200 ON Input Logic High Voltage V IH VIN = 1.8V 0.75 V VIN = 5.5V 1.30 ON Input Logic Low Voltage V IL VIN = 1.8V 0.5 V VIN = 5.5V 1.0 ON Input Leakage V ON = VIN or GND 1 µA Off Switch Leakage I SWOFF VON = 0V, VOUT = 0V @ VIN = 5.5V, TA = 85°C 1µ A VON = 0V, VOUT = 0V @ VIN = 3.3V, TA = 25°C 10 100 nA FLAGB Output Logic Low Voltage VIN = 5V, ISINK = 10mA 0.1 0.2 V VIN = 1.8V, ISINK = 10mA 0.15 0.3 FLAGB Output High Leakage Current V IN = 5V, Switch on 1 µA Protections Current Limit I LIM VIN = 3.3V, VOUT = 3.0V FPF2100, FPF2101, FPF2102, FPF2103 200 300 400 mA FPF2104, FPF2105, FPF2106, FPF2107 400 600 800 Thermal Shutdown Shutdown Threshold 140 °CReturn from Shutdown 130 Hysteresis 10
4 www.fairchildsemi.com FPF2100-FPF2107 Rev. H FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products Electrical Characteristics Cont. Note 1: Package power dissipation on 1 square inch pad, 2 oz. copper board. Note 2: Applicable only to FPF2102 and FPF2106. Latchoff current does not include current flowing into FLAGB. Parameter Symbol Conditions Min Typ Max Units Protections Under Voltage Shutdown UVLO V IN Increasing 1.5 1.6 1.7 V Under Voltage Shutdown Hysteresis 47 mV Dynamic Turn on time t ON RL = 500Ω, CL = 0.1µF 25 µs Turn off time t OFF RL = 500Ω, CL = 0.1µF 50 µs VOUT Rise Time t R RL = 500Ω, CL = 0.1µF 12 µs VOUT Fall Time t F RL = 500Ω, CL = 0.1µF 136 µs Over Current Blanking Time t BLANK FPF2100, FPF2101, FPF2102, FPF2104, FPF2105, FPF2106 51 0 2 0m s Auto-Restart Time t RSTRT FPF2100, FPF2101, FPF2104, FPF2105 80 160 320 ms Short Circuit Response Time VIN = VON = 3.3V. Moderate Over-Current Condition. 3µ s VIN = VON = 3.3V. Hard Short. 20 ns
9 www.fairchildsemi.com FPF2100-FPF2107 Rev. H FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products Description of Operation The FPF2100-FPF2107 are current limited switches that protect systems and loads which can be damaged or disrupted by the application of high currents. The core of each device is a 0.125Ω P-channel MOSFET and a controller capable of functioning over a wide input operating range of 1.8-5.5V. The controller protects against sys tem malfunctions through current limiting, under-voltage lockout and thermal shutdown. The current limit is preset for either 200mA or 400mA. On/Off Control The ON pin controls the state of the switch. Active HI and LO versions are available. Refer to the Ordering Information for details. Activating ON continuously holds the switch in the on state so long as there is no fault. For all versions, an under- voltage on V IN or a junction temperature in excess of 150°C overrides the ON control to turn off the switch. In addition, excessive currents will cause the switch to turn off in FPF2100- FPF2102 and FPF2104-FPF2107. The FPF2100, FPF2101, FPF2104 and FPF2105 have an Auto-Restart feature which will automatically turn the switch on again after 160ms. For the FPF2102 and FPF2106, the ON pin must be toggled to turn-on the switch again. The FPF2103 and FPF2107 do not turn off in response to a over current condition but instead remain operating in a constant current mode so long as ON is active and the thermal shutdown or under-voltage lockout have not activated. Fault Reporting Upon the detection of an over-current, an input under-voltage, or an over-temperature conditi on, the FLAGB signals the fault mode by activating LO. For the FPF2100-FPF2102 and FPF2104-FPF2106, the FLAGB goes LO at the end of the blanking time while FLAGB goes LO immediately for the FPF2103 and FPF2107. FLAGB remains LO through the Auto- Restart Time for the FPF2100, FPF2101 FPF2104 and FPF2105. For the FPF2102 and FPF2106, FLAGB is latched LO and ON must be toggled to release it.With the FPF2103 and FPF2107, FLAGB is LO during the faults and immediately returns HI at the end of the fault condition. FLAGB is an open- drain MOSFET which requires a pull-up resistor between VIN and FLAGB. During shutdown, the pull-down on FLAGB is disabled to reduce current draw from the supply. Current Limiting The current limit ensures that the current through the switch doesn't exceed a maximum value wh ile not limiting at less than a minimum value. For the FPF2100-FPF2103 the minimum current is 200mA and the maximum current is 400mA and for the FPF2104-FPF2107 the minimum current is 400mA and the maximum current is 800mA. The FPF2100-FPF2103 have a blanking time of 10ms, nominally, during which the switch will act as a constant current source. At the end of the blanking time, the switch will be turned-off and the FLAGB pin will activate to indicate that current limiting has occurred. The FPF2103 and FPF2107 have no current limit blanking period so immediately upon a current limi t condition FLAGB is activated. These parts will remain in a constant current state until the ON pin is deactivated or the thermal shutdown turns-off the switch. Reverse Voltage If the voltage at the V OUT pin is larger than the V IN pin, large currents may flow and can cause permanent damage to the device. FPF2100-FPF2107 is des igned to control current flow from VIN to VOUT. Under-Voltage Lockout The under-voltage lockout turns-off the switch if the input voltage drops below the under-voltage lockout threshold. With the ON pin active the input voltage rising above the under- voltage lockout threshold will c ause a controlled turn on of the switch which limits current over-shoots. Thermal Shutdown The thermal shutdown protects the part from internally or externally generated excessive temperatures. During an over- temperature condition the FLAGB is activated and the switch is turned-off. The switch automatically turns-on again if the temperature of the die drops below the threshold temperature.
10 www.fairchildsemi.com FPF2100-FPF2107 Rev. H FPF2100-FPF2107 IntelliMAX™ Advanced Load Management Products
Application Information
1.8V-5.5V C1 = 4.7µF R1 = 100KΩ C2 = 0.1µF R2 = 499Ω Input Capacitor To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns-on into a discharged load capacitor or a short-circuit, a capacitor needs to be placed between V IN and GND. A 4.7µF ceramic capacitor, CIN, must be placed close to the VIN pin. A higher value of CIN can be used to further reduce the voltage drop experienced as the switch is turned on into a large capacitive load. Output Capacitor A 0.1uF capacitor C OUT, should be placed between V OUT and GND. This capacitor will prev ent parasitic board inductances from forcing VOUT below GND when the switch turns-off. For the FPF2100-FPF2102 and the FPF2104-FPF2106, the total output capacitance needs to be kept below a maximum value, C OUT(max), to prevent the part from registering an over-current condition and turning off the switch. The maximum output capacitance can be determined from the following formula, Due to the integral body diode in the PMOS switch, a C IN greater than COUT is highly recommended. A COUT greater than CIN can cause V OUT to exceed V IN when the system supply is removed. This could result in current flow through the body diode from V OUT to VIN. Power Dissipation During normal operation as a switch, the power dissipation is small and has little effect on the operating temperature of the part. The parts with the higher cu rrent limits will dissipate the most power and that will only typically be, If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. For the FPF2100, FPF2101, FPF2104 and FPF2105, the powe r dissipation will scale by the Auto-Restart Time, t RSTRT, and the Over Current Blanking Time, t BLANK, so that the maximum power dissipated is typically, When using the FPF2102 and FPF2106 attention must be given to the manual resetting of the part. Continuously resetting the part at a high duty cycle when a short on the output is present can cause the temperature of the part to increase. The junction temperature will only be allowed to increase to the thermal shutdown threshold. Once th is temperature has been reached, toggling ON will not turn on the switch until the junction temperature drops. For the FPF2103 and FPF2107, a short on the output will cause the part to operate in a constant current state dissipating a worst case power as calculated in (3) until the thermal shutdown activates. It will then cycle in and out o f thermal shutdown so long as the ON pin is active and the short is present. Board Layout For best performance, all traces should be as short as possible. To be most effective, the input and output capacitors should be placed close to the device to mini mize the effects that parasitic trace inductances may have on normal and short-circuit operation. Using wide traces for V IN, VOUT and GND will help minimize parasitic el ectrical effects along with minimizing the case to ambient thermal impedance. Pm a x() tBLANK (1) (2) COUT max() ILIM max() tBLANK min()× VIN PI LIM() 2 RDS× 0.2() 2 0.125× 80mW== =
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