FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Features General Description 1.8 to 5.5V Input Voltage Range The FPF2123, FPF2124, and FPF2125 are a series of load switches which provides full protection to systems and loads which may encounter large current conditions. These devices contain a 0.125Ω 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. 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 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. Reverse Current Blocking Applications PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports These parts are available in a space-saving 5 pin SOT23 package Hot Swap Supplies Typical Application Circuit TO LOAD VOUT VIN FPF2123 - FPF2125 OFF ON ON ISET GND ©2005 Fairchild Semiconductor Corporation FPF2123-FPF2125 Rev. C 1 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products August 2005 VIN UVLO REVERSE CONTROL LOGIC ON CURRENT BLOCKING CURRENT LIMIT VOUT THERMAL SHUTDOWN ISET GND Pin Configuration VIN 1 GND 2 ON 3 5 VOUT 4 ISET SOT23-5 Pin Description Pin Name 1 VIN 2 GND 3 ON Function Supply Input: Input to the power switch and the supply voltage for the IC Ground ON Control Input 4 ISET Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. 5 VOUT Switch Output: Output of the power switch FPF2123-FPF2125 Rev. C 2 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Functional Block Diagram Parameter Min. Max. -0.3 VIN, VOUT, ON, ISET to GND Power Dissipation @ TA = 25°C (note 1) Unit 6 V 667 mW Operating Temperature Range -40 125 °C Storage Temperature -65 150 °C 150 °C/W Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection HBM 4000 V MM 400 V Recommended Operating Range Parameter Min. Max. Unit VIN 1.8 5.5 V Ambient Operating Temperature, TA -40 85 °C Electrical Characteristics VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C. Parameter Symbol Conditions Min. Typ. Max Units Basic Operation 1.8 5.5 Operating Voltage VIN Quiescent Current IQ Shutdown Current ISHDN Reverse Block Leakage Current IBLOCK Latch-Off Current ILATCHOFF FPF2124 On-Resistance RON TA = 25°C, IOUT = 50mA 125 TA = -40 to +85°C, IOUT = 50mA 150 ON Input Logic High Voltage (ON) ON Input Logic Low Voltage VIH VIL ON Input Leakage IOUT = 0mA VIN = 1.8 to 3.3V 75 VIN = 3.3 to 5.5V 80 120 2 µA 1 µA 50 VIN = 1.8V 0.75 VIN = 5.5V 1.30 V µA µA 160 mΩ V VIN = 1.8V 0.5 VIN = 5.5V 1.0 V VON = VIN or GND 1 µA ISWOFF VON = 0V, VOUT = 0V 1 µA Current Limit ILIM VIN = 3.3V, VOUT = 3.0V, RSET=576Ω 1000 mA Min. Current Limit ILIM(min.) VIN = 3.3V, VOUT = 3.0V Off Switch Leakage Protections Thermal Shutdown 600 150 mA Shutdown Threshold 140 °C Return from Shutdown 130 10 Hysteresis Under Voltage Shutdown UVLO VIN Increasing Under Voltage Shutdown Hysteresis FPF2123-FPF2125 Rev. C 800 1.5 1.6 50 3 1.7 V mV www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Absolute Maximum Ratings VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C. Parameter Symbol Conditions Min. Typ. Max Units Dynamic Turn on time tON RL=500Ω, CL=0.1uF 25 µs Turn off time tOFF RL=500Ω, CL=0.1uF 70 µs VOUT Rise Time tR RL=500Ω, CL=0.1uF 12 µs VOUT Fall Time tF RL=500Ω, CL=0.1uF 200 µs Over Current Blanking Time tBLANK FPF2123, FPF2124 5 10 20 ms Auto-Restart Time tRESTART FPF2123 80 160 320 ms FPF2124, FPF2125 Short Circuit Response Time NA VIN = VON = 3.3V. Moderate Over-Current Condition. 3 µs VIN = VON = 3.3V. Hard Short. 20 ns Note 1: Package power dissipation on 1square inch pad, 2 oz copper board. FPF2123-FPF2125 Rev. C 4 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Electrical Characteristics Cont. 95 76 VON = VIN SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 74 72 70 68 66 85 75 VIN = 5.5V VIN = 3.3V 65 VIN = 1.8V 55 64 45 -40 62 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 -15 450 SUPPLY CURRENT (nA) SUPPLY CURRENT (nA) 500 VIN = 5.5V 1500 1000 VIN = 3.3V 500 -15 10 35 60 400 350 VIN = 5.5V 300 250 200 150 100 0 -40 85 VIN = 3.3V -15 10 35 60 85 TJ, JUNCTION TEMPERATURE (oC) TJ, JUNCTION TEMPERATURE ( C) Figure 3. ISHUTDOWN Current vs. Temperature Figure 4. ISWITCH-OFF Current vs. Temperature o 0.20 1.4 0.18 1.2 0.16 SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 85 I_SWOFF 50 0 -40 60 Figure 2. Quiescent Current vs. Temperature I_SHDN 2000 35 TJ, JUNCTION TEMPERATURE ( C) Figure 1. Quiescent Current vs. Input Voltage 2500 10 o SUPPLY VOLTAGE (V) 0.14 0.12 0.10 0.08 0.06 0.04 1 VIN = 5.5V 0.8 0.6 0.4 VIN = 3.3V 0.2 0.02 0 -40 0.00 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Figure 5. Reverse Current vs. VOUT FPF2123-FPF2125 Rev. C -15 10 35 60 85 TJ, JUNCTION TEMPERATURE (oC) SUPPLY VOLTAGE (V) Figure 6. Reverse Current vs. Temperature 5 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Typical Characteristics 900 55 VIN - VOUT = 0.3V RSET = 576Ω 53 OUTPUT CURRENT (mA) SUPPLY CURRENT (uA) 54 52 51 50 49 48 47 850 800 750 46 45 -40 700 -15 10 35 60 85 1.5 2 2.5 TJ, JUNCTION TEMPERATURE (oC) 3 3.5 4 4.5 5 5.5 6 VIN, INPUT VOLTAGE (V) Figure 7. ILATCH-OFF Current vs. Temperature Figure 8. Current Limit vs. Input Voltage 1600 900 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) RSET = 576Ω 850 800 750 -40 -15 10 35 60 1200 800 400 0 200 85 800 1400 2000 2600 TJ, JUNCTION TEMPERATURE ( C) RSET, (Ohms) Figure 9. Current Limit vs. Temperature Figure 10. Current Limit vs. Rest o 1.5 3200 170 160 150 R(ON) (mOhms) ON THRESHOLD (V) 1.2 0.9 0.6 140 130 120 110 0.3 100 0 90 1 2 3 4 5 1 6 Figure 11. VIH vs. VIN FPF2123-FPF2125 Rev. C 2 3 4 5 6 VIN, Input Voltage (V) VIN, Input Voltage (V) Figure 12. RON vs. VIN 6 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Typical Characteristics 100 200 ILOAD = 10mA VCC = 3.3V TURN-ON/OFF TIMES (uS) 180 VIN = 1.8V R(ON) (mOhms) 160 140 VIN = 3.3V 120 VIN = 5.5V 100 TD(OFF) TD(ON) 80 60 -40 -15 10 35 60 10 -40 85 -15 10 35 60 TJ, JUNCTION TEMPERATURE (oC) TJ, JUNCTION TEMPERATURE (oC) Figure 13. R(ON) vs. Temperature Figure 14. TON/TOff vs. Temperature 85 14 1000 ILOAD = 10mA T(FALL) FLAG-BLANKING TIME (mS) TURN-ON/OFF TIMES (uS) VCC = 3.3V 100 T(RISE) 10 1 -40 -15 10 35 60 13 12 11 10 9 8 -40 85 -15 10 35 60 TJ, JUNCTION TEMPERATURE (oC) TJ, JUNCTION TEMPERATURE ( C) Figure 15. TRISE/TFALL vs. Temperature Figure 16. TBLANK vs. Temperature 85 o 200 RESTART TIME (mS) 190 VDRV 2V/DIV 180 170 VOUT 2V/DIV 160 150 140 IOUT 400mA/DIV 130 120 -40 -15 10 35 60 85 TJ, JUNCTION TEMPERATURE (oC) Figure 17. TRESTART vs. Temperature FPF2123-FPF2125 Rev. C Figure 18. TBLANK Response 7 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Typical Characteristics VDRV 2V/DIV VON 2V/DIV VOUT 2V/DIV IOUT 10mA/DIV IOUT 400mA/DIV Figure 19. TRESTART Response Figure 20. TON Response VON 2V/DIV VIN 2V/DIV IOUT 10mA/DIV IOUT 4A/DIV VOUT 2V/DIV Figure 21. TOFF Response Figure 22. Short Circuit Response Time (Output Shorted to GND) VIN 2V/DIV VIN=VON 2V/DIV VON 2V/DIV IOUT 400mA/DIV IOUT 400mA/DIV Figure 23. Current Limit Response Time (Switch power up to hard short) FPF2123-FPF2125 Rev. C Figure 24. Current Limit Response Time (Output Shorted to GND by 2.2Ω, moderate short) 8 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Typical Characteristics 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. The FPF2123, FPF2124, and FPF2125 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 system malfunctions through current limiting under-voltage lockout and thermal shutdown. The current limit is adjustable from 150mA to 1.5A through the selection of an external resistor. 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. On/OffControl The ON pin controls the state of the switch. When ON is high, the switch is in the on state. 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 140°C overrides the ON control to turn off the switch. In addition, excessive currents will cause the switch to turn off in the FPF2123 and FPF2124. The FPF2123 has an Auto-Restart feature which will automatically turn the switch on again after 160ms. For the FPF2124, the ON pin must be toggled to turn-on the switch again. The FPF2125 does not turn off in response to an over current condition but instead remains operating in a constant current mode so long as ON is active and the thermal shutdown or under-voltage lockout have not activated. 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. The current at which the parts will limit is adjustable through the selection of an external resistor connected to ISET. Information for selecting the resistor is found in the Application Info section. The FPF2123 and FPF2124 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. The FPF2125 has no current limit blanking period so it will remain in a constant current state until the ON pin is deactivated or the thermal shutdown turns-off the switch. Ordering Information Part Current Limit [mA] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2123 0.15 - 1.5A 5/10/20 80/160/320 Active HI 2123 FPF2124 0.15 - 1.5A 5/10/20 NA Active HI 2124 FPF2125 0.15 - 1.5A Infinite NA Active HI 2125 FPF2123-FPF2125 Rev. C 9 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Description of Operation FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Application Information Typical Application LOAD VOUT VIN R2 = 499Ω FPF2123- FPF2125 Battery 1.8V-5.5V OFF ON ON ISET GND C2 = 0.1µF C1 = 10µF R1 = 100KΩ Setting Current Limit Current Limit Various RSET Values The FPF2123, FPF2124, and FPF2125 have a current limit which is set with an external resistor connected between ISET and GND. This resistor is selected by using the following equation, R SET 460 = I LIM (1) RSET is in Ohms and that of ILIM is Amps The table below can also be used to select RSET. A typical application would be the 500mA current that is required by a single USB port. Using the table below an appropriate selection for the RSET resistor would be 604Ω. This will ensure that the port load could draw 570mA, but not more than 950mA. Likewise for a dual port system, an RSET of 340Ω would always deliver at least 1120mA and never more than 1860mA. 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 capacitance 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. Output Capacitor FPF2123-FPF2125 Rev. C I LIM (max) ∗ t BLANK (min) V IN Min. Current Limit [mA] Typ. Current Limit [mA] Max. Current Limit [mA] 309 1120 1490 1860 340 1010 1350 1690 374 920 1230 1540 412 840 1120 1400 453 760 1010 1270 499 690 920 1150 549 630 840 1050 576 600 800 1000 604 570 760 950 732 470 630 790 887 390 520 650 1070 320 430 540 1300 260 350 440 1910 180 240 300 3090 110 150 190 Power Dissipation 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. For the FPF2123 and FPF2124, the total output capacitance needs to be kept below a maximum value, COUT(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, C OUT (max) = RSET [Ω] During normal operation as a switch, the power dissipated in the part will depend upon the level at which the current limit is set. The maximum allowed setting for the current limit is 1.5A and this will result in a typical power dissipation of, P = (I LIM ) 2 ∗ R ON = (1.5) 2 ∗ 0.125 = 2 81mW (3) If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. For the FPF2123 the power dissipation will scale by the Auto-Restart Time, tRESTART, and the Over Current Blanking Time, tBLANK, so that the maximum power dissipated is, (2) 10 www.fairchildsemi.com = FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products P(max)= t BLANK(max) ∗ VIN (max)∗ L LIM (max) t RESTART(min) + t BLANK(max) 20 ∗ 5 . 5 ∗ 1 . 5 = 1 . 65 W 80 + 20 (4) This is more power than the package can dissipate, but the thermal shutdown of the part will activate to protect the part from damage due to excessive heating. When using the FPF2124, attention must be given to the manual resetting of the part. Continuously resetting the part when a short on the output is present will cause the temperature of the part to increase. The junction temperature will only be able to increase to the thermal shutdown threshold. Once this temperature has been reached, toggling ON will not turn-on the switch until the junction temperature drops. For the FPF2125, a short on the output will cause the part to operate in a constant current state dissipating a worst case power of, P(max) = V IN (max) ∗ I LIM (max) = 5 . 5 ∗ 1.5 (5) = 8 . 25 W This large amount of power will activate the thermal shutdown and the part will 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. FPF2123-FPF2125 Rev. C 11 www.fairchildsemi.com FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Dimensional Outline and Pad Layout FPF2123-FPF2125 Rev. 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PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I16