FPF2165R FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
1.8 to 5.5V Input Voltage Range 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 Reverse Current Blocking RoHS Compliant
Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies General Description The FPF2165R is a load switch which provides full protection to systems and loads which may encounter large current conditions. These devic es contain a 0.12 Ω current-limited P- channel 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. When the switch current reaches the current limit, the parts operate in a constant-current mode to prohibit excessive currents from causing damage. T he 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. These parts are available in a space-saving 6 pin 2X2 MLP package.
Ordering Information
[mA] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2165R 150-1500 0 NA Active HI 65R BOTTOM TOP Pin 1
2 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit Typical Application Circuit Functional Block Diagram OFF ON ON VIN GND FPF2165R ISET VOUT TO LOAD FLAGB UVLO THERMAL SHUTDOWN CURRENT LIMIT CONTROL LOGIC VIN ON ISET FLAGB GND REVERSE CURRENT BLOCKING VOUT
3 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit Pin Configuration Pin Description Absolute Maximum Ratings Recommended Operating Range
Electrical Characteristics
1 ISET Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. 2V IN Supply Input: Input to the power switch and the supply voltage For the IC 3V OUT Switch Output: Output of the power switch
4 FLAGB Fault Output: Active LO, open drain output which indicates an over current supply under
voltage or over temperature state. 5, 7 GND Ground
6 ON ON Control Input
Parameter Min. Max. Unit VIN, VOUT, ON, FLAGB, ISET to GND -0.3 6 V Power Dissipation 1.2 W Operating and Storage Junction Temperature -65 150 °C Thermal Resistance, Junction to Ambient 86 °C/W Electrostatic Discharge Protection Jedec A114A HBM 4000 V Jedec C101C CDM 2000 V Jedec A115 MM 400 V IEC 61000-4-2 Air Discharge 15000 V Contact Discharge 8000 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 VIN = 1.8V 63 100 µAVIN = 3.3V 68 VIN = 5.5V 77 120 ISET VIN VOUTFLAGB ON 2X2 MicroFET-6 GND 7
4 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit Electrical Characteristics Cont. Note 1: Package power dissipation on 1square inch pad, 2 oz copper board. Parameter Symbol Conditions Min Typ Max Units On-Resistance R ON VIN = 3.3V, IOUT = 200mA, TA = 25°C 120 160 mΩ VIN = 3.3V, IOUT = 200mA, TA = 85°C 135 180 VIN = 3.3V, IOUT = 200mA, TA = -40°C to +85°C 65 180 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 58 143 ON Input Logic High Voltage (ON) VIH VIN = 1.8V 0.8 V VIN = 5.5V 1.4 ON Input Logic Low Voltage V IL VIN = 1.8V 0.5 V VIN = 5.5V 1 ON Input Leakage V ON = 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 VIN = 5V, ISINK = 10mA 0.05 0.2 V VIN = 1.8V, ISINK = 10mA 0.12 0.3 FLAGB Output High Leakage Current VIN = 5V, Switch on 1 µA Reverse Block V OUT Shutdown Current VON = 0V, VOUT = 5.5V, VIN = short to GND -2 2 µA Protections Current Limit I LIM 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 Thermal Shutdown Shutdown Threshold 140 °CReturn from Shutdown 130 Hysteresis 10 Under Voltage Shutdown UVLO V IN Increasing 1.55 1.65 1.75 V Under Voltage Shutdown Hysteresis 50 mV Dynamic Delay On Time td ON RL = 500Ω, CL = 0.1µF 25 µs Delay Off Time td OFF RL = 500Ω, CL = 0.1µF 45 µs VOUT Rise Time t RISE RL = 500Ω, CL = 0.1µF 10 µs VOUT Fall Time t FALL RL = 500Ω, CL = 0.1µF 110 µs Short Circuit Response Time VIN = VOUT = 3.3V. Moderate Over-Current Condition. 5µ s VIN = VOUT = 3.3V. Hard Short. 30 ns
7 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit Description of Operation 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. 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 V IN 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. The ON pin control voltage and V IN pin have independent recommended operating ranges. The ON pin voltage can be driven by a voltage level higher than the input voltage. 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-c onditioned 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. 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 c ontrolled turn-on of the switch which limits current over-shoots. 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 V BUS. The reverse current blocking feature is active when the load switch is turned off. 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 r eport a fault condition if this feature is activated. Thermal Shutdown 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.
8 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit
Application Information
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, 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. Current Limit Various RSET Values Input Capacitor 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-circui t, 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. Output Capacitor 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. 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, 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, 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. R SET [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 (1)ILIM = 340.1 x RSET -1.0278 (2)P = (ILIM)2 x RDS = (0.77)2 x 0.12 = 71.148mW (3)P(max) = VIN(max) x ILIM(max) = 5.5 x 0.77 = 4.235W OFF ON ON VIN GND FPF2165R ISET VOUT LOAD 1.8V-5.5V C1 = 4.7µF RSET C2 = 0.1µF R2 = 500Ω FLAGB
9 www.fairchildsemi.com FPF2165R Rev. A 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 V IN, VOUT and GND will help minimize parasitic el ectrical 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 (P D = (VIN - VOUT) x I LIM(max)) could exceed the maximum absolute power dissipation of 1.2W.
10 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit Dimensional Outline and Pad Layout
11 www.fairchildsemi.com FPF2165R Rev. A FPF2165R Full Function Load Switch with Adjustable Current Limit TRADEMARKS The following includes registered and unregistered trademarks and serv ice marks, owned by Fairchild Semiconductor and/or its gl obal subsidianries, and is not intended to be an exhaustive list of all such trademarks. * Trademarks of System General Corporation, used under license by Fairchild Semiconductor. DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITH OUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD°ØS WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. 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