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| www..com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products May 2005 FPF2108-FPF2110 IntelliMAXTM 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 <2uA Shutdown Current Fast Current limit Response Time 3us to Moderate Over Currents 20ns to Hard Shorts Reverse Current Blocking Fault Blanking General Description The FPF2108-FPF2110 is a series of load switches which provides full protection to systems and loads which may encounter large current conditions. This devices contain a 0.125 current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V. Internally, reverse current blocking prevents current 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 FPF2108, if the constant current condition still persists after 10ms, the part will shut off the switch and pull the fault signal pin (FLAGB) low. The switch will remain off until the ON pin is cycled. For the FPF2109 and FPF2110, 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 FPF2109 while that for the FPF2108 and FPF2110 is 400mA. 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 FPF2108 - FPF2110 OFF ON ON GND FLAGB (c)2005 Fairchild Semiconductor Corporation FPF2108-FPF2110 Rev. B 1 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Functional Block Diagram VIN UVLO ON CONTROL LOGIC REVERSE CURRENT BLOCKING CURRENT LIMIT THERMAL SHUTDOWN VOUT FLAGB GND Pin Configuration VIN 1 GND ON 2 3 SOT23-5 4 FLAGB 5 VOUT Pin Description Pin 1 2 3 4 5 Name VIN GND ON FLAGB VOUT Ground ON Control Input Function Supply Input: Input to the power switch and the supply voltage for the IC Fault Output: Active LO, open drain output which indicates an over current supply, under voltage or over temperature state. Switch Output: Output of the power switch FPF2108-FPF2110 Rev. B 2 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Absolute Maximum Ratings Parameter VIN, VOUT, ON, FLAGB to GND Power Dissipation @ TA = 25C (note 1) Operating Temperature Range Storage Temperature Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection HBM MM 4000 400 -40 -65 Min. -0.3 Max. 6 667 125 150 150 Unit V mW C C C/W V V Recommended Operating Range Parameter VIN Ambient Operating Temperature, TA Min. 1.8 -40 Max. 5.5 85 Unit V C Electrical Characteristics VIN = 1.8 to 5.5V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25C. Parameter Basic Operation Operating Voltage Quiescent Current Shutdown Current Reverse Block Leakage Current Latch-Off Current (note 2) On-Resistance ON Input Logic High Voltage ON Input Logic Low Voltage ON Input Leakage Off Switch Leakage FLAGB Output Logic Low Voltage FLAGB Output High Leakage Current Protections Current Limit Symbol VIN IQ ISHDN IBLOCK ILATCHOFF RON VIH VIL Conditions Min. 1.8 Typ. Max 5.5 Units V A IOUT = 0mA Von active VIN = 1.8 to 3.3V VIN = 3.3 to 5.5V 95 110 200 2 1 A A A m V VON = VIN, after an overcurrent fault TA = 25C, IOUT = 50mA TA = -40 to +85C, IOUT = 50mA VIN = 1.8V VIN = 5.5V VIN = 1.8V VIN = 5.5V VON = VIN or GND 0.75 1.30 50 125 150 160 0.5 1.0 1 1 0.1 0.15 0.2 0.3 1 FPF2109 FPF2108, FPF2110 200 400 300 600 140 130 10 1.5 1.6 47 1.7 400 800 V A A V A mA ISWOFF VON = 0V, VOUT = 0V VIN = 5V, ISINK = 10mA VIN = 1.8V, ISINK = 10mA VIN = 5V, Switch on ILIM VIN = 3.3V, VOUT = 3.0V Thermal Shutdown Shutdown Threshold Return from Shutdown Hysteresis C Under Voltage Shutdown Under Voltage Shutdown Hysteresis UVLO VIN Increasing V mV FPF2108-FPF2110 Rev. B 3 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Electrical Characteristics Cont. VIN = 1.8 to 5.5V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25C. Parameter Dynamic Turn on time Turn off time VOUT Rise Time VOUT Fall Time Over Current Blanking Time Short Circuit Response Time Symbol tON tOFF tR tF tBLANK Conditions RL=500 , CL=0.1uF RL=500 , CL=0.1uF RL=500 , CL=0.1uF RL=500 , CL=0.1uF FPF2108 VIN = VON = 3.3V. Moderate Over-Current Condition. VIN = VON = 3.3V. Hard Short. Min. Typ. 25 50 12 136 Max Units s s s s 5 10 3 20 20 ms s ns Note 1: Package power dissipation on 1square inch pad, 2 oz copper board. Note 2: Applicable only to FPF2108. Latchoff current does not include current flowing into FLAGB. FPF2108-FPF2110 Rev. B 4 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Typical Characteristics 120 VON = VIN 110 100 90 80 70 60 1.5 SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 150 130 110 VIN = 5.5V VIN = 3.3V 90 70 VIN = 1.8V 2 2.5 3 3.5 4 4.5 5 5.5 6 50 -40 -15 10 35 o 60 85 SUPPLY VOLTAGE (V) TJ, JUNCTION TEMPERATURE ( C) Figure 1. Quiescent Current vs. Input Voltage Figure 2. Quiescent Current vs. Temperature 2500 I_SHDN SUPPLY CURRENT (nA) 2000 I_SWOFF SUPPLY CURRENT (nA) 2000 VIN = 5.5V 1500 VIN = 5.5V 1500 1000 1000 500 VIN = 3.3V 500 VIN = 3.3V 0 -40 -15 10 35 o 60 85 0 -40 -15 10 35 o 60 85 TJ, JUNCTION TEMPERATURE ( C) TJ, JUNCTION TEMPERATURE ( C) Figure 3. ISHUTDOWN Current vs. Temperature Figure 4. ISWITCH-OFF Current vs. Temperature 0.20 0.18 SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 1.4 1.2 1 VIN = 5.5V 0.8 0.6 0.4 VIN = 3.3V 0.2 0 -40 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 -15 10 35 o 60 85 SUPPLY VOLTAGE (V) TJ, JUNCTION TEMPERATURE ( C) Figure 5. Reverse Current vs. VOUT Figure 6. Reverse Current vs. Temperature FPF2108-FPF2110 Rev. B 5 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Typical Characteristics 700 600 OUTPUT CURRENT (mA) 500 400 300 200 100 0 0.3 700 600 500 400 300 200 100 -40 FPF2109 OUTPUT CURRENT (mA) FPF2108, FPF2110 FPF2108, FPF2110 FPF2109 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 -15 10 35 o 60 85 VIN-VOUT (V) TJ, JUNCTION TEMPERATURE ( C) Figure 7. Current Limit vs. Output Voltage Figure 8. Current Limit vs. Temperature 200 180 ON THRESHOLD (V) 1.4 1.2 FPF2109, FPF2110 160 RON (mOhms) 140 120 VIN = 1.8V VIN = 3.3V VIN = 5.5V 1 FPF2108 0.8 0.6 0.4 0.2 0 100 80 60 -40 -15 10 35 o 60 85 1.5 2 2.5 3 3.5 4 4.5 5 5.5 TJ, JUNCTION TEMPERATURE ( C) VIN, INPUT VOLTAGE (V) Figure 9. R(ON) vs. Temperature Figure 10. VIH vs. VIN 100 ILOAD = 10mA VCC = 3.3V 1000 ILOAD = 10mA VCC = 3.3V T(FALL) TD(OFF) TURN-ON/OFF TIMES (uS) TURN-ON/OFF TIMES (uS) 100 TD(ON) T(RISE) 10 10 -40 -15 10 35 o 60 85 1 -40 -15 10 35 o 60 85 TJ, JUNCTION TEMPERATURE ( C) TJ, JUNCTION TEMPERATURE ( C) Figure 11. TON/TOff vs. Temperature Figure 12. TRISE/TFALL vs. Temperature FPF2108-FPF2110 Rev. B 6 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Typical Characteristics 12 FLAG-BLANKING TIME (mS) 11 10 9 8 7 6 5 4 -40 VDRV 2V/DIV VOUT 2V/DIV IOUT 200mA/DIV VFLAGB 2V/DIV -15 10 35 o 60 85 TJ, JUNCTION TEMPERATURE ( C) 5mS/DIV Figure 14. TBLANK Response (VDRV signal forces the device to go into overcurrent condition.) Figure 13. TBLANK vs. Temperature RL = 500, CL = 0.1uF VON 2V/DIV RL = 500, CL = 0.1uF VON 2V/DIV IOUT 10mA/DIV IOUT 10mA/DIV 100uS/DIV Figure 15. TON Response 200nS/DIV Figure 16. TOFF Response VIN 2V / DIV CIN = 10uF COUT = 0.1uF VIN/VON 2V/DIV VIN = VON IOUT 5A/DIV VOUT 2V/DIV 20uS/DIV Figure 17. Short Circuit Response Time (Output Shorted to GND) IOUT 200mA/DIV 50uS/DIV Figure 18. Current Limit Response (Switch power up to hard short) FPF2108-FPF2110 Rev. B 7 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Typical Characteristics VIN 2V/DIV VON 2V/DIV IOUT 200mA/DIV 50uS/DIV Figure 19. Current Limit Response Time (Output Shorted to GND by 10, moderate short) FPF2108-FPF2110 Rev. B 8 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Description of Operation The FPF2108-FPF2110 is a current limited switch that protects systems and loads which can be damaged or disrupted by the application of high currents. The core of the device is a 0.125 P-channel MOSFET and a controller capable of functioning over a wide input operating range of 1.8-5.5V. The controller protects against system malfunctions through current limiting, under-voltage lockout and thermal shutdown. The current limit is preset for either 200mA or 400mA. limit 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. 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 cause a controlled turn on of the switch which limits current over-shoots. On/OffControl 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 VIN or a junction temperature in excess of 150C overrides the ON control to turn off the switch. For FPF2108, the ON pin must be toggled to turn on the switch again. The FPF2109 and FPF2110 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. When the MOSFET is off, the body diode is disabled so no current can flow through it. 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. Fault Reporting Upon the detection of an over-current, an input under-voltage, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. For the FPF2108, the FLAGB goes LO at the end of the blanking time while FLAGB goes LO immediately for the FPF2109 and FPF2110. For the FPF2108, FLAGB is latched LO and ON must be toggled to release it.With the FPF2109 and FPF2110, 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 while not limiting at less than a minimum value. For the FPF2109 the minimum current is 200mA and the maximum current is 400mA and for the FPF2108 and FPF2110 the minimum current is 400mA and the maximum current is 800mA. The FPF2108 has 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 FPF2109 and FPF2110 have no current limit blanking period so immediately upon a current Ordering Information Part FPF2108 FPF2109 FPF2110 Current Limit [mA] 400 200 400 Current Limit Blanking Time [ms] 10 0 0 Auto-Restart Time [ms] NA NA NA ON Pin Activity Active LO Active HI Active HI Top Mark 2108 2109 2110 FPF2108-FPF2110 Rev. B 9 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Application Information Typical Application VIN Battery 1.8V-5.5V VOUT LOAD R1 = 100K R2 = 499 C2 = 0.1F FPF2108 - FPF2110 OFF ON C1 = 10F ON GND FLAGB 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 VIN and GND. A 0.1uF ceramic capacitor, CIN, placed close to the pins is usually sufficient. Higher values of CIN can be used to further reduce the voltage drop. A 0.1uF capacitor COUT, should be placed between VOUT and GND. This capacitor will prevent parasitic board inductances from forcing VOUT below GND when the switch turns-off. Output Capacitor 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 current limits will dissipate the most power and that will only typically be, P = (ILIM)2 RDS = (0.8)2 0.125 = 80mW When in current limit the maximum power dissipation will occur when the output is shorted to ground. A short on the output will cause the part to operate in a constant current state until the thermal shutdown activates. It will then cycle in and out of 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 minimize the effects that parasitic trace inductances may have on normal and short-circuit operation. Using wide traces for VIN, VOUT and GND will help minimize parasitic electrical effects along with minimizing the case to ambient thermal impedance. FPF2108-FPF2110 Rev. B 10 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products Dimensional Outline and Pad Layout FPF2108-FPF2110 Rev. B 11 www.fairchildsemi.com FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products FPF2108-FPF2110 Rev. B 12 www.fairchildsemi.com |
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