FPF2165R Full Function Load Switch with Adjustable Current Limit tm Features General Description 1.8 to 5.5V Input Voltage Range The FPF2165R is a load switch which provides full protection to systems and loads which may encounter large current conditions. These devices contain a 0.12Ω current-limited Pchannel 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. Controlled Turn-On 0.15-1.5A Adjustable Current Limit +/- 10% Current Limit Accuracy versus Temperature Undervoltage Lockout Thermal Shutdown <2µA Shutdown Current Fast Current limit Response Time 5µs to Moderate Over Currents 30ns to Hard Shorts When the switch current reaches the current limit, the parts operate in a constant-current mode to prohibit excessive currents from causing damage. The FPF2165R 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 RoHS Compliant Applications PDAs These parts are available in a space-saving 6 pin 2X2 MLP package. Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies Pin 1 BOTTOM TOP Ordering Information Part Current Limit [mA] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2165R 150-1500 0 NA Active HI 65R ©2008 Fairchild Semiconductor Corporation FPF2165R Rev. A 1 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit April 2009 FPF2165R Full Function Load Switch with Adjustable Current Limit Typical Application Circuit TO LOAD VOUT VIN FPF2165R FLAGB OFF ON ON ISET GND Functional Block Diagram VIN UVLO REVERSE CURRENT BLOCKING CONTROL LOGIC ON CURRENT LIMIT VOUT ISET THERMAL SHUTDOWN FLAGB GND FPF2165R Rev. A 2 www.fairchildsemi.com ON 6 GND 5 FLAGB 4 7 1 ISET 2 VIN 3 VOUT 2X2 MicroFET-6 Pin Description Pin Name 1 ISET 2 VIN 3 VOUT 4 FLAGB 5, 7 GND 6 ON Function Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. Supply Input: Input to the power switch and the supply voltage For the IC Switch Output: Output of the power switch Fault Output: Active LO, open drain output which indicates an over current supply under voltage or over temperature state. Ground ON Control Input Absolute Maximum Ratings Parameter Min. VIN, VOUT, ON, FLAGB, ISET to GND Max. -0.3 Power Dissipation Operating and Storage Junction Temperature -65 6 V 1.2 W 150 °C 86 °C/W Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection Unit Jedec A114A HBM 4000 V Jedec C101C CDM 2000 V Jedec A115 MM IEC 61000-4-2 400 V Air Discharge 15000 V Contact Discharge 8000 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 Operating Voltage VIN Quiescent Current IQ FPF2165R Rev. A 1.8 IOUT = 0mA 3 5.5 VIN = 1.8V 63 VIN = 3.3V 68 VIN = 5.5V 77 V 100 µA 120 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Pin Configuration 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 VIN = 3.3V, IOUT = 200mA, TA = 25°C 120 VIN = 3.3V, IOUT = 200mA, TA = 85°C On-Resistance RON ON Input Logic High Voltage (ON) VIH ON Input Logic Low Voltage VIL VIN = 3.3V, IOUT = 200mA, TA = -40°C to +85°C Typ 135 65 Max Units 160 180 180 VIN = 5V, IOUT = 200mA, TA = 25°C 95 124 VIN = 5V, IOUT = 200mA, TA = 85°C 110 143 VIN = 5V, IOUT = 200mA, TA = -40°C to +85°C 58 VIN = 1.8V 0.8 VIN = 5.5V 1.4 mΩ 143 V VIN = 1.8V 0.5 VIN = 5.5V 1 V ON Input Leakage VON = VIN or GND -1 1 µA VIN Shutdown Current VON = 0V, VIN = 5.5V, VOUT = short to GND -2 2 µA FLAGB Output Logic Low Voltage FLAGB Output High Leakage Current VIN = 5V, ISINK = 10mA 0.05 0.2 VIN = 1.8V, ISINK = 10mA 0.12 0.3 VIN = 5V, Switch on V 1 µA 2 µA Reverse Block VON = 0V, VOUT = 5.5V, VIN = short to GND VOUT Shutdown Current -2 Protections Current Limit ILIM Thermal Shutdown Under Voltage Shutdown UVLO VIN = 3.3V, VOUT = 3.0V, RSET = 1840Ω 135 150 165 mA VIN = 3.3V, VOUT = 3.0V, RSET = 361Ω 720 800 880 mA VIN = 3.3V, VOUT = 3.0V, RSET = 196Ω 1350 1500 1650 mA Shutdown Threshold 140 Return from Shutdown 130 Hysteresis 10 VIN Increasing 1.55 Under Voltage Shutdown Hysteresis 1.65 °C 1.75 V 50 mV Dynamic Delay On Time tdON RL = 500Ω, CL = 0.1µF 25 µs Delay Off Time tdOFF RL = 500Ω, CL = 0.1µF 45 µs VOUT Rise Time tRISE RL = 500Ω, CL = 0.1µF 10 µs VOUT Fall Time tFALL RL = 500Ω, CL = 0.1µF 110 µs VIN = VOUT = 3.3V. Moderate Over-Current Condition. 5 µs VIN = VOUT = 3.3V. Hard Short. 30 ns Short Circuit Response Time Note 1: Package power dissipation on 1square inch pad, 2 oz copper board. FPF2165R Rev. A 4 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Electrical Characteristics Cont. 100 78 SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 95 76 74 72 70 68 90 85 80 VIN = 5.5V 75 VIN = 3.3V 70 VIN = 1.8V 65 60 55 66 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 50 6 -40 SUPPLY VOLTAGE (V) 35 60 85 Figure 2. Quiescent Current vs. Temperature 1.5 1.2 1.4 1.1 1.3 VON LOW VOLTAGE (V) VON HIGH VOLTAGE (V) 10 TJ, JUNCTION TEMPERATURE (°C) Figure 1. Quiescent Current vs. Input Voltage 1.2 1.1 1 0.9 0.8 1 0.9 0.8 0.7 0.6 0.7 0.5 0.6 1.5 2 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) 5 5.5 1.5 6 2 2.5 3 3.5 4 4.5 5 5.5 6 SUPPLY VOLTAGE (V) Figure 4. VON Low Voltage vs. Input Voltage Figure 3. VON High Voltage vs. Input Voltage 200 240 190 220 180 200 170 160 RON (mOhms) RON (mOhms) -15 150 140 130 120 110 VIN= 1.8V 180 160 140 VIN= 3.3V 120 100 100 VIN= 5.5V 80 90 80 1 2 3 4 5 60 -40 6 SUPPLY VOLTAGE(V) Figure 5. RON vs. VIN FPF2165R Rev. A -15 10 35 TJ, JUNCTION TEMPERATURE (°C) 60 85 Figure 6. RON vs. Temperature 5 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Typical Characteristics 1000 100 VIN = 3.3 V RL = 500 Ohms RISE / FALL TIME (uS) DELAY ON/OFF TIME (uS) VIN = 3.3 V RL = 500 Ohms COUT = 0.1uF tdOFF tdON 10 -40 -15 10 35 60 TF 100 TR 10 1 -40 85 -15 TJ, JUNCTION TEMPERATURE (°C) Figure 7. tdON / tdOFF vs. Temperature 10 35 TJ, JUNCTION TEMPERATURE (°C) CIN = 10µF COUT = 0.1µF VIN = 3.3V RL = 500Ω VON 2V/DIV CIN = 10µF COUT = 0.1µF VIN = 3.3V RL = 500Ω IOUT 10mA/DIV 85 Figure 8. TRISE / TFALL vs. Temperature VIN 2V/DIV VON 2V/DIV 60 IOUT 10mA/DIV VOUT 2V/DIV 100µs/DIV 500ns/DIV Figure 9. tdON Response VIN = VON 2V/DIV Figure 10. tdOFF Response CIN = 10µF VIN = VON = 3.3V VOUT = GND IOUT 500mA/DIV 20µs/DIV Figure 11. Current Limit Response Time (Switch is powered into a short) FPF2165R Rev. A 6 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Typical Characteristics Undervoltage Lockout The undervoltage lockout turns-off the switch if the input voltage drops below the undervoltage lockout threshold. With the ON pin active the input voltage rising above the undervoltage lockout threshold will cause a controlled turn-on of the switch which limits current over-shoots. The FPF2165R is a current limited switch that protect systems and loads which can be damaged or disrupted by the application of high currents. The core of each device is a 0.12Ω 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, undervoltage lockout and thermal shutdown. The current limit is adjustable from 0.15A to 1.5A through the selection of an external resistor. Reverse Current Blocking The FPF2165R family has a Reverse Current Blocking feature that protects input source against current flow from output to input. For a standard USB power design, this is an important feature which protects the USB host from being damaged due to reverse current flow on VBUS. The reverse current blocking feature is active when the load switch is turned off. On/Off Control 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. An undervoltage on VIN or a junction temperature in excess of 140°C overrides the ON control to turn off the switch. The FPF2165R 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 undervoltage lockout have not activated. If ON pin is LO and output voltage become greater than input voltage, no current can flow from the output to the input. The FLAGB operation is independent of the Reverse Current blocking feature and will not report a fault condition if this feature is activated. Thermal Shutdown The ON pin control voltage and VIN pin have independent recommended operating ranges. The ON pin voltage can be driven by a voltage level higher than the input voltage. The thermal shutdown protects the die 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 temperature of the die drops below the threshold temperature. Fault Reporting Upon the detection of an over-current, an input undervoltage, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. With the FPF2165R, 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. 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 FPF2165R 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. For preventing the switch from large power dissipation during heavy load a short circuit detection feature is introduced. Short circuit condition is detected by observing the output voltage. The switch is put into short circuit current limiting mode if the switch is loaded with a heavy load. When the output voltage drops below VSCTH, short circuit detection threshold voltage, the current limit value re-conditioned and short circuit current limit value is decreased to 62.5% of the current limit value. This keeps the power dissipation of the part below a certain limit even at dead short conditions at 5.5V input voltage. The VSCTH value is set to be 1V. At around 1.1V of output voltage the switch is removed from short circuit current limiting mode and the current limit is set to the current limit value. FPF2165R Rev. A 7 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Description of Operation Typical Application VIN FPF2165R LOAD VOUT FLAGB 1.8V-5.5V OFF ON ON R2 = 500Ω ISET C2 = 0.1µF GND C1 = 4.7µF RSET Setting Current Limit Input Capacitor The FPF2165R 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, To limit the voltage drop on the input supply caused by transient in-rush currents when the switch is turned on into a discharged load capacitor or a short-circuit, a capacitor needs to be placed between VIN 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. ILIM = 340.1 x RSET-1.0278 (1) The table below can 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 570Ω. Output Capacitor A 0.1uF capacitor COUT, should be placed between VOUT and Current Limit Various RSET Values GND. This capacitor will prevent parasitic board inductances RSET [Ω] Min. Current Limit [mA] Typ. Current Limit [mA] Max. Current Limit [mA] 1840 135 150 165 1391 180 200 220 937 270 300 330 708 360 400 440 632 405 450 495 570 450 500 550 478 540 600 660 411 630 700 770 361 720 800 880 322 810 900 990 290 900 1000 1100 265 990 1100 1210 243 1080 1200 1320 225 1170 1300 1430 209 1260 1400 1540 196 1350 1500 1650 FPF2165R Rev. A from forcing VOUT below GND when the switch turns-off. Power Dissipation 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 0.77A and this will result in a power dissipation of, P = (ILIM)2 x RDS = (0.77)2 x 0.12 = 71.148mW (2) If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. 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. A short on the output will cause the part to operate in a constant current state dissipating a worst case power of, P(max) = VIN(max) x ILIM(max) (3) = 5.5 x 0.77 = 4.235W 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. 8 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Application Information FPF2165R Full Function Load Switch with Adjustable Current Limit 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. The middle pad (pin 7) should be connected to the GND plate of PCB for improving thermal performance of the load switch. An improper layout could result higher junction temperature and triggering the thermal shutdown protection feature. This concern applies when the switch is set at higher current limit value and an overcurrent condition occurs. In this case power dissipation of the switch (PD = (VIN - VOUT) x ILIM(max)) could exceed the maximum absolute power dissipation of 1.2W. FPF2165R Rev. A 9 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit Dimensional Outline and Pad Layout FPF2165R Rev. A 10 www.fairchildsemi.com The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidianries, and is not intended to be an exhaustive list of all such trademarks. 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Obsolete Not In Production Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor. The datasheet is for reference information only. Rev. I40 FPF2165R Rev. A 11 www.fairchildsemi.com FPF2165R Full Function Load Switch with Adjustable Current Limit TRADEMARKS