FPF2172 IntelliMAX™ Advanced Load Management Products tm Features General Description 1.8 to 5.5V Input Voltage Range The FPF2172 is a load switch which combines the functionality of the IntelliMAXTM series load switch with a very low forward voltage drop Schottky barrier rectifier. The integrated solution provides full protection to systems and loads which may encounter large current conditions in a very compact MLP 3x3 package. This device contain a 0.125Ω current-limited Pchannel MOSFET which can operate over an input voltage range of 1.8-5.5V. The Schottky diode acts as a barrier so that no reverse current can flow 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 200mA Current Limit Option Undervoltage Lockout Thermal Shutdown <1µA Shutdown Current Fast Current limit Response Time 3µs to Moderate Over Currents 20ns to Hard Shorts Integrated very low VF Schottky Diode for Reverse Current Blocking RoHS Compliant Applications When the switch current reaches the current limit, the part operates in a constant-current mode to prohibit excessive currents from causing damage. 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 switch will remain off until the ON pin is cycled. The minimum current limit is 200mA. PDAs Cell Phones GPS Devices MP3 Players Digital Cameras These parts are available in a space-saving 6L MLP 3x3 package. Peripheral Ports Hot Swap Supplies Typical Application Circuit TO LOAD VOUT VIN FPF2172 OFF ON ON FLAGB GND Ordering Information Part Current Limit [mA] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2172 200 10 NA Active HI 2172 ©2008 Fairchild Semiconductor Corporation FPF2172 Rev. I 1 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products August 2008 VIN UVLO CONTROL LOGIC ON CURRENT LIMIT VOUT THERMAL SHUTDOWN FLAGB GND Pin Configuration 1 8 6 3 2 7 5 4 3x3 MLP BOTTOM VIEW Pin Description Pin Name 1 VIN Supply Input: Input to the power switch and the supply voltage for the IC 2, 8 NC No Connect 3, 7 VOUT 4 FLAGB 5 GND 6 ON FPF2172 Rev. I Function 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 2 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Functional Block Diagram Parameter Min Max Unit VIN, ON, FLAGB to GND -0.3 6 V VOUT to GND -0.3 20 V - 1.4 W Operating Temperature Range Power Dissipation @ TA = 25°C (note 1) -40 85 °C Storage Temperature -65 150 °C - 70 °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 V Basic Operation Operating Voltage 1.8 - 5.5 IOUT = 0mA VIN = 1.8 to 3.3V - 95 - VON ACTIVE VIN = 3.3 to 5.5V - 110 200 - - 1 µA VIN µA Quiescent Current IQ Shutdown Current ISHDN Latch-off Current ILATCHOFF VON = VIN, after and overcurrent fault - 50 - µA IR VOUT = 20V, VIN = VON = 0V, TA = 25°C - 10 100 µA 20 - - V - 0.3 0.4 0.23 - - 0.36 - Reverse Block Leakage Current Reverse Breakdown Voltage IOUT = 250mA TA = 25°C, IOUT = 150mA Dropout Voltage VDROP TA = 85°C, IOUT = 150mA TA = -40°C, IOUT = 150mA ON Input Logic High Voltage (ON) ON Input Logic Low Voltage VIH VIL ON Input Leakage Off Switch Leakage FLAGB Output Logic Low Voltage FLAGB Output High Leakage Current FPF2172 Rev. I ISWOFF VIN = 1.8V 0.75 - - VIN = 5.5V 1.3 - - V V VIN = 1.8V - - 0.5 VIN = 5.5V - - 1.0 VON = VIN or GND - - 1 µA 1 µA 10 100 nA VON = 0V, VOUT = 0V @ VIN = 5.5V, TA = 85°C VON = 0V, VOUT = 0V @ VIN = 3.3V, TA = 25°C VIN = 5V, ISINK = 10mA - - 0.2 VIN = 1.8V, ISINK = 10mA - - 0.3 VIN = 5V, Switch on - - 1 3 V V µA www.fairchildsemi.com FPF2172 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 200 300 400 mA - 140 - Return from Shutdown - 130 - Hysteresis - 10 - 1.5 1.6 1.7 V - 47 - mV Protections Current Limit ILIM VIN = 3.3V, VOUT = 2.0V Shutdown Threshold Thermal Shutdown Under Voltage Shutdown UVLO VIN Increasing Under Voltage Shutdown Hysteresis °C Dynamic Turn on time tON RL = 500Ω, CL = 0.1µF - 22 - µs Turn off time tOFF RL = 500Ω, CL = 0.1µF - 20 - µs VOUT Rise Time tR RL = 500Ω, CL = 0.1µF - 13 - µs VOUT Fall Time tF RL = 500Ω, CL = 0.1µF Over Current Blanking Time tBLANK Short Circuit Response Time - 117 - µs 5 10 20 ms VIN = VON = 3.3V. Moderate Over-Current Condition. - 3 - µs VIN = VON = 3.3V. Hard Short. - 20 - ns Note 1: Package power dissipation on 1 square inch pad, 2 oz. copper board. FPF2172 Rev. I 4 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Electrical Characteristics Cont. 100 120 VON = VIN SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) 110 95 90 85 100 VIN = 5.5V 90 VIN = 1.8V 80 VIN = 3.3V 70 80 1 2 3 4 SUPPLY VOLTAGE (V) 5 60 -40 6 Figure 1. Quiescent Current vs. Input Voltage 10 35 60 TJ, JUNCTION TEMPERATURE (oC) 0.6 SUPPLY CURRENT (uA) 1.6 1.2 0.8 VIN = 5.5V 0.4 0.2 VIN = 5.5V 0.4 VIN = 3.3V VIN = 3.3V 0 -40 -15 10 35 60 TJ, JUNCTION TEMPERATURE (oC) 0 -40 85 Figure 3. ISHUTDOWN Current vs. Temperature -15 10 35 60 TJ, JUNCTION TEMPERATURE (oC) 85 Figure 4. ISWITCH-OFF Current vs. Temperature 1.8 60 VIN = 3.3V 1.6 1.4 55 ON THRESHOLD (V) SUPPLY CURRENT (uA) 85 Figure 2. Quiescent Current vs. Temperature 2 SUPPLY CURRENT (uA) -15 50 45 1.2 1.0 0.8 0.6 0.4 0.2 40 -40 0.0 -15 10 35 60 TJ, JUNCTION TEMPERATURE (oC) 1.5 85 Figure 5. Latchoff current vs. Temperature FPF2172 Rev. I 2 2.5 3 3.5 4 4.5 VIN, INPUT VOLTAGE (V) 5 5.5 6 Figure 6. Input Voltage vs. On Threshold Voltage 5 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Typical Characteristics 400 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 400 350 300 250 2 2.5 3 3.5 4 4.5 VIN, INPUT VOLTAGE (V) 5 5.5 350 300 250 200 -40 200 1.5 VIN = 3.3V 6 -15 Figure 7. Current Limit vs. Output Voltage 85 VIN = 3.3V IOUT = 150mA DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 60 400 IOUT = 150mA 325 300 275 1 2 3 4 VIN, INPUT VOLTAGE (V) 5 350 300 250 200 -40 250 6 35 60 85 Figure 10. Drop Voltage vs. Temperature 1000 TURN ON/OFF TIMES (us) VIN = 3.3V 30 tON 20 tOFF -15 10 35 60 o TJ, JUNCTION TEMPERATURE ( C) tFALL 100 10 1 -40 85 Figure 11. TON/TOff vs. Temperature FPF2172 Rev. I 10 o VIN = 3.3V 10 -40 -15 TJ, JUNCTION TEMPERATURE ( C) Figure 9. Drop Voltage vs. Input Voltage DELAY TIMES (us) 35 Figure 8. Current Limit vs. Temperature 350 40 10 TJ, JUNCTION TEMPERATURE (oC) tRISE -15 10 35 60 o TJ, JUNCTION TEMPERATURE ( C) 85 Figure 12. TRISE/TFALL vs. Temperature 6 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Typical Characteristics 15 FLAG-BLANKING TIME (ms) VIN = 3.3V 13 V DRV 2V/DIV 11 FLAGB 2V/DIV 9 IOUT 200mA/DIV 7 VOUT 2V/DIV 5 -40 -15 10 35 60 o TJ, JUNCTION TEMPERATURE ( C) 85 5ms/DIV Figure 13. TBLANK vs. Temperature VON 2V/DIV Figure 14. TBLANK Response VON 2V/DIV CIN = 10µF CL = 0.1µF RL = 500Ω IOUT 10mA/DIV 100µs/DIV Figure 15. TON Response Figure 16. TOFF Response VIN 2V/DIV CIN = 10µF CL = 0.1µF CIN = 10µF CL = 0.1µF VON 2V/DIV IOUT 5A/DIV VOUT 2V/DIV IOUT 200mA/DIV 50µs/DIV 20µs/DIV Figure 17. Short Circuit Response Time (Output Shorted to GND) FPF2172 Rev. I CIN = 10µF CL = 0.1µF RL = 500Ω IOUT 10mA/DIV 100µs/DIV VIN 2V/DIV CIN = 10µF CL = 0.1µF RL = 500Ω Figure 18. Current Limit Response Time (Output has a 4.7Ω load) 7 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Typical Characteristics Current Limiting The current limit guarantees that the current through the switch doesn't exceed a maximum value while not limiting at less than a minimum value. The minimum current is 200mA and the maximum current is 400mA. The device 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 FPF2172 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 0.125Ω P-channel MOSFET and a controller capable of functioning over a wide input operating range of 1.8-5.5V paired with a low forward voltage drop Schottky diode for reverse blocking. The controller protects against system malfunctions through current limiting, under-voltage lockout and thermal shutdown. The current limit is preset for 200mA. 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 undervoltage lockout threshold will cause a controlled turn-on of the switch which limits current over-shoots. On/Off Control The ON pin controls the state of the switch. Activating ON continuously holds the switch in the on state so long as there is no under-voltage on VIN or a junction temperature in excess of 150°C. ON is active HI and has a low threshold making it capable of interfacing with low voltage signals. When the MOSFET is off, the Schottky diode acts as a barrier so that no reverse current can flow when VOUT is greater than VIN. Thermal Shutdown The thermal shutdown protects the die from internally or externally generated excessive temperatures. During an overtemperature 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 under-voltage, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. The FLAGB goes LO at the end of the blanking time and is latched LO and ON must be toggled to release it. 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. FPF2172 Rev. I 8 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Description of Operation Typical Application VOUT VIN FPF2172 Battery 5.5V OFF ON C1 = 4.7µF ON R1 = 100KΩ R2 = 110Ω FLAGB GND 5.5V MAX C2 = 0.1µF 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 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 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 be typically, P = I LIM × V DROP = 0.4 × 0.4 = 160mW (1) When using the part, 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 this temperature has been reached, toggling ON will not turn-on the switch until the junction temperature drops. 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. FPF2172 Rev. I 9 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products Application Information FPF2172 IntelliMAX™ Advanced Load Management Products Dimensional Outline and Pad Layout Package MLP06H FPF2172 Rev. 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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. I35 FPF2172 Rev. I 11 www.fairchildsemi.com FPF2172 IntelliMAX™ Advanced Load Management Products TRADEMARKS 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.