FPF2223

FPF2223 ONSEMI | Alldatasheet

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©2008 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com February 2009 FPF2223-FPF2225 Rev. C FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit

Features

1.8 to 5.5V Input Voltage Range Typical RDS(ON) = 140m @ VIN = 5.5V Typical RDS(ON) = 160m @ VIN = 3.3V 250-625mA (min) Adjustable Current Limit 5% Current Limit Tolerance @ 625mA (min) 72 (typ) Output Discharge Resistance ESD Protected, Above 8kV HBM and 2kV CDM

Applications

The FPF2223-FPF2225 are low R DS(ON) P-Channel MOSFET load switches with high precision current limit val ue. The input voltage range operates from 1.8V to 5.5V to fulfill today's Ultra Portable Device's supply requirement. Switch contro l is by a logic input (ON) capable of interfacing directly wi th low voltage control signal. On-chip pull-down is available for output quick discharge when switch is turned off. For the FPF2224, if the constant current condition still persists after 30ms, these parts will shut off the switch an d pull the fault signal pin (FLAGB) low. The FPF2223 has an auto-res tart feature, which will turn the switch on again after 450mS if the ON pin is still active. The FPF2224 do not have thi s auto-restart feature so the switch will remain off until the ON pin is cycled. For the FPF2225, a current limit condition will imm ediately pull the fault signal pin low and the part will remain i n the constant- current mode until the switch current falls below t he current limit. For the FPF2223 through FPF2225, the current limit is set by an external resistor and the minimum current lim it is 250mA.

Ordering Information

(mA) Current Limit Blanking Time (mS) Auto-Restart Time (mS) ON Pin Activity FPF2223 250-625 30 450 Active HI FPF2224 250-625 30 NA Active HI FPF2225 250-625 NA NA Active HI BOTTOM TOP Pin 1

2 www.fairchildsemi.com FPF2223-FPF2225 Rev. C FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit Typical Application Circuit Functional Block Diagram OFF ON ON VIN GND FPF2223/4/5 ISET VOUT TO LOAD FLAGB UVLO THERMAL SHUTDOWN CURRENT LIMIT CONTROL LOGIC VIN ON ISET FLAGB GND VOUT Output Discharge

3 www.fairchildsemi.com FPF2223-FPF2225 Rev. C FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit Pin Configuration Pin Description Absolute Maximum Ratings Recommended Operating Range

Electrical Characteristics

1 I SET Current Limit Set Input : A resistor from I SET to ground sets the current limit for the switch

2 V IN Supply Input: Input to the power switch and the sup ply voltage for the IC

3 V OUT Switch Output: Output of the power switch

4 FLAGB Fault Output: Active LO, open drain output which in dicates an over current, supply

under voltage or over temperature state

5 GND Ground

6 ON ON/OFF Control Input

Parameter Min. Max. Unit VIN, VOUT, ON, FLAGB TO GND -0.3 6 V ISET TO GND -0.3 0.3 V Power Dissipation @ TA = 25° C 1.2 W Operating and Storage Junction Temperature -65 125 ° C Thermal Resistance, Junction to Ambient 86 ° C/W Electrostatic Discharge Protection HBM 8000 V MM 400 V CDM 2000 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=VON=1.8V, RSET=36K 45 75 AIOUT=0mA, VIN=VON=3.3V, RSET=36K 50 80 IOUT=0mA, VIN=VON=5.5V, RSET=36K 55 95 VIN Shutdown Current V ON=0V, VIN=5.5V, VOUT=short to GND 2.5 A FLAGB GND ISET1 VIN VOUT ON MicroFET 2x2 6L (BOTTOMVIEW)

4 www.fairchildsemi.com FPF2223-FPF2225 Rev. C FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit VOUT Shutdown Current V ON=0V, VOUT=5.5V, VIN=short to GND 1 A On-Resistance R ON VIN=5.5V, IOUT=200mA, TA=25° C 140 185 m VIN=3.3V, IOUT=200mA, TA=25° C 160 210 VIN=1.8V, IOUT=200mA, TA=25° C 230 300 VIN=3.3V, IOUT=200mA, TA=-40 to +80° C 90 265 Output Discharge Resistance V IN=3.3V, VON=0V, IOUT=10mA 72 105 ON Input Logic High Voltage (ON) V IH VIN=1.8V 0.8 V VIN=5.5V 1.4 ON Input Logic Low Voltage (OFF) V IL VIN=1.8V 0.5 V VIN=5.5V 1.0 On Input Leakage V ON = VIN or GND -1 1 A FLAGB Output Logic Low Voltage VIN=5.5V, ISINK=100A 0.05 0.1 V VIN=1.8V, ISINK=100A 0.12 0.25 FLAGB Output High Leakage Current V IN=5.5V, Switch on 1 uA Protections Current Limit I LIM VIN=3.3V, VOUT = 3.0V, RSET=36K, TA=25° C 627 660 693 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 Turn On Time t ON RL=500, CL=0.001uF 70 S Turn Off Time t OFF RL=500, CL=0.001uF 600 nS VOUT Rise Time t RISE RL=500, CL=0.001uF 40 S VOUT Fall Time t FALL RL=500, CL=0.001uF 100 nS Over Current Blanking Time t BLANK FPF2223, FPF2224 15 30 60 mS Auto-Restart Time t RSTRT FPF2223 225 450 900 mS Current Limit Response Time VIN = VON = 3.3V. Over-Current Condition: RLOAD=VIN/(ILIMx4) 5 S Parameter Symbol Conditions Min. Typ. Max. Units

9 www.fairchildsemi.com FPF2223-FPF2225 Rev. C FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit Description of Operation The FPF2223, FPF2224, and FPF2225 are state of the art Adjustable High Precision Current Limit switches th at protect systems and loads which can be damaged or disrupted by the application of high currents. The core of each devi ce is a 0.16 P-channel MOSFET and a controller capable of functioning over an input operating range of 1.8- 5.5V. The controll er protects or offers current limiting, UVLO(undervoltage lockout) and thermal shutdown protection. The current limit is adjustabl e from 250mA to 625mA through the selection of an external resis tor. On/Off Control The ON pin is active high, and controls the state o f the switch. Applying a continuous high signal will hold the swi tch in the on state. The switch will move into the OFF state when the active high is removed, or if a fault is encountered. For all versions, an undervoltage on VIN or a junction temperature in ex cess 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 FPF2223 and FPF2224. The FPF2223 has an Auto-Re start feature which will automatically turn the switch on again after 450ms. For the FPF2224, the ON pin must be toggled to turn-on the switch again. The FPF2225 does not turn off in response to an over current condition but instead remains opera ting in a constant current mode so long as ON is active and t he thermal shutdown or UVLO have not activated. Fault Reporting Upon the detection of an over-current condition, an input UVLO, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. In the event of an over-curr ent condition for the FPF2223 and FPF2224, the FLAGB goes LO at t he end of the blanking time while FLAGB goes LO immediatel y for the FPF2225. If the over-current condition lasts longer than blanking time, FLAGB remains LO through the Auto-Re start Time for the FPF2223 while for the FPF2224, FLAGB i s latched LO and ON must be toggled to release it. With the F PF2225, FLAGB is LO during the faults and immediately retur ns HI at the end of the fault condition. FLAGB is an open-drain MOSFET which requires a pull-up resistor between VIN and F LAGB. During shutdown, the pull-down on FLAGB is disabled to reduce current draw from the supply. A 100K pull up resistor is recommended to be used in the application. Current Limiting The current limit ensures that the current through the switch doesn't exceed a maximum value while not limiting a t less than a minimum value. The current at which the parts wil l limit is adjustable through the selection of an external res istor connected to the ISET pin. The FPF2223 and FPF2224 have a blanking time of 30ms (nominal) during which the sw itch will act as a constant current source. At the end of the bla nking time, the switch will be turned-off. The FPF2225 has no c urrent limit blanking period so it will remain in a constant cur rent state until the ON pin is deactivated or the thermal shutdown t urns-off the switch. Undervoltage Lockout (UVLO) The undervoltage lockout turns-off the switch if the input voltage drops below the undervoltage lockout threshold. Wit h the ON pin active the input voltage rising above the under voltage lockout threshold will cause a controlled turn-on o f the switch which limits current over-shoots. Output Discharge Resistor The FPF2223/4/5 family contains an 80 on-chip load resistor for quick output discharge when the switch is turne d off. This features become more attractive when application re quires large output capacitor to be discharge when the swi tch tunrs off. However, V OUT pin should not be connected directly to the battery source due to the discharge mechanism of th e load switch. Thermal Shutdown The thermal shutdown protects the die from internal ly or externally generated excessive temperatures. During an over- temperature condition the FLAGB is activated and th e switch is turned-off. The switch automatically turns-on again if temperature of the die drops below the threshold te mperature.

10 www.fairchildsemi.com FPF2223-FPF2225 Rev. C FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit

Application Information

The FPF2223, FPF2224, and FPF2225 have adjustable h igh precision current limit which is set with an extern al resistor connected between ISET and GND. Please see the layo ut recommendation section of the application note for the recommended RSET layout. The R SET resistance is selected by using the following equation: For a particular I LIM(min) value, R SET can be calculated from below formula: FPF222X family has 5% precision at higher load curr ent. The I LIM (Max) and tolerance of current limit value can be determ ined using Figure 23 (ILIM vs RSET ) and the following formula: The table and figure below can be used to select R SET: 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-circuit, a capacitor is r ecommended to be placed between VIN and GND. A 1uF ceramic capacitor, CIN, placed close to the pins is usually sufficient. Hig her values of CIN can be used to further reduce the voltage drop. Output Capacitor A 0.1uF capacitor C OUT, should be placed between V OUT and GND. This capacitor will prevent parasitic board in ductances from forcing VOUT below GND when the switch turns-off. For the FPF2223 and FPF2224, the total output capacitance n eeds to be kept below a maximum value, C OUT(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: Power Dissipation During normal on-state operation, the power dissipa ted in the device will depend upon the level at which the curr ent limit is set. The maximum allowed setting for the current li mit is 625mA and will result in a power dissipation of: If the part goes into current limit, maximum power dissipation will occur when the output is shorted to ground. Fo r the FPF2223, the power dissipation will be scaled by th e Auto- Restart Time, t RSTRT, and the Over Current Blanking Time, tBLANK. Therefore, the maximum power dissipated is: RSET [k] Min. Current Limit [mA] Typ. Current Limit [mA] Max. Current Limit [mA] Tol [%] ILIM (Typ) (mA) = 23764 RSET (K) RSET (K) = 23764 ILIM (Min) (mA) + 25 + 4700 ILIM (Min) (mA) Tolerance (%) = 100 * ILIM (Typ) - ILIM (Min) ILIM (Typ) ILIM (Max) = ILIM (Typ) + ILIM (Typ) * Tolerance (%) 100 Table 1: RSET Selection Guide 240 300 360 420 480 540 600 660 720 34 42 50 58 66 74 82 RSET (KOhms) ILIMIT (mA) Max Min Typ Figure 23. ILIM vs RSET

0.05 C 0.05 C 2.0 2.0 PIN#1 IDENT A B SIDE VIEW RECOMMENDED LAND PATTERN BOTTOM VIEW SEATING PLANE 1 3 PIN #1 IDENT 0.65 1.30 1.21 0.52(6X) 0.90 0.42(6X)0.65 2.25 1.68 (0.40) (0.70) NOTES: A. PACKAGE DOES NOT FULLY CONFORM TO JEDEC MO-229 REGISTRATION B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 2009. D. LAND PATTERN RECOMMENDATION IS EXISTING INDUSTRY LAND PATTERN. E. DRAWING FILENAME: MKT-MLP06Krev5. (0.20)4X

0.10 C A B

0.05 C “ (6X) (6X) (0.60) 0.08 C

0.10 C “

“ C 1.72 0.15

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