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1 LTC441114411faLTC4411 SCHOTTKYDIODECONSTANT IONCONSTANTRONCONSTANTVONVFWDFORWARD VOLTAGE (V)LTC4411 FO1bSLOPE1/RONSLOPE1/RFWDIOCIMAXIFWDCURR ENT (A) FSTATUS OUTPUT IS LOW WHEN WALL ADAPTER IS SUPPLYING LOAD CURRENTBATTERYCELL(S)470k4411 F01 VCCTYPICAL APPLICATIOUAPPLICATIO SUDESCRIPTIOUFEATURES, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Low Loss Replacement for PowerPathTMOR ing Diodes Small Regulated Forward Voltage (28mV) Maximum Forward Current Low Forward ON Resistance (140m Max) Low Reverse Leakage Current (<1 A) to Operating Range Internal Current Limit Protection Internal Thermal Protection No External Active Components Pin-Compatible Monolithic Replacementfor the LTC4412 Low Quiescent Current (40 A) Low-Profile (1mm)

2 5-lead SOT-23 Low LossIdeal Diode in ThinSOTTMThe LTC 4411 is an ideal diode IC, capable of supplying upto from an input voltage between and TheLTC4411 is housed in a 5-lead 1mm profile LTC4411 contains a 140m P-channel MOSFET con-necting IN to OUT. During normal forward operation, thedrop across the MOSFET is regulated to as low as current is less than 40 A for load currents up to100mA. If the output voltage exceeds the input voltage, theMOSFET is turned off and less than 1 A of reverse currentflows from OUT to IN. Maximum forward current is limitedto a constant (typical) and internal thermal limiting cir-cuits protect the part during fault open-drain STAT pin indicates conduction status.

3 TheSTAT pin can be used to drive an auxiliary P-channelMOSFET power switch connecting an alternate powersource when the LTC4411 is not conducting active-high control pin turns off the LTC4411 andreduces current consumption to less than 25 A. Whenshut off, the LTC4411 indicates this condition with a lowvoltage on the status 1. Automatic Switchover of LoadBetween a Battery and a Wall Adapter Cellular Phones Handheld Computers Digital Cameras USB Peripherals Uninterrupted Supplies Logic Controlled Power SwitchLTC4411 vs Schottky DiodeForward Voltage Characteristics2 LTC44114411faIN, OUT, STAT, CTL Voltage.

4 To 6 VOperating Ambient Temperature Range(Note 2) .. 40 C to 85 COperating Junction Temperature(Note 3) .. 40 C to 125 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) .. 300 CContinuous Power Dissipation(Derate 10mW/ C above 70 C) .. 500mWORDER PARTNUMBERS5 PARTMARKINGTJMAX = 125 C, JA = 250 C/W (Note 3)LTAENLTC4411ES5 ABSOLUTE AXI U RATI GSWWWUPACKAGE/ORDER I FOR ATIOUUW(Note 1)Consult LTC Marketing for parts specified with wider operating temperature CHARACTERISTICS5 OUT4 STATIN 1 TOP VIEWS5 PACKAGE5-LEAD PLASTIC SOT-23 GND 2 CTL 3 The denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25 C.

5 (Note 6)SYMBOLPARAMETERCONDITIONSMINTYPMAXUNIT SVIN, VOUTO perating Supply Range Current in Forward RegulationVIN = , ILOAD = 100mA40 A(Note 4)IQ(Off)Quiescent Current in ShutdownVIN = , VSTAT = 0V, VCTL > VIH 2225 AIQRINQ uiescent Current While in ReverseVIN = ATurn-Off. Current Drawn from VINVOUT = Current While in ReverseVIN = 141723 ATurn-Off. Current Drawn from VOUTVOUT = Current When VOUT Supplies PowerVIN = 0V, VOUT = 11 AVFWDF orward Turn-On Voltage (VIN VOUT)VIN = 81728 mV VRTOR everse Turn-Off Voltage (VOUT VIN)VIN = 4514mVRFWDF orward ON Resistance, (VIN-VOUT)/ (ILOAD)VIN = , 100mA < ILOAD < 500mA 100140m RONON Resistance in Constant RON ModeVIN = , ILOAD = 1000mA 140245m UVLOU ndervoltage LockoutVIN Rising, 0 C < TA < 85 Rising Falling OutputIS(SNK)STAT Pin Sink CurrentVIN = , VOUT > VIN + VRTO,71118 AVCTL > VTH + VHYSTIS(OFF)

6 STAT Pin Off CurrentVIN = , VOUT < VIN VFWD, 1 1 AVCTL < VTH VHYSTtS(ON)STAT Pin Turn-On stS(OFF)STAT Pin Turn-Off sCTL InputVTHCTL Input Threshold VoltageVTH = (VIL + VIH)/2 390460530mVVHYSTCTL Input HysteresisVHYST = (VIH VIL)90mVICTLCTL Input Pull-Down CurrentVOUT < VIN = , VCTL = AShort-Circuit ResponseIOCC urrent LimitVIN = (Note 5) Current While inVIN = , IOUT = AOvercurrent OperationLTC441134411faMeasured Thermal Resistance (2-Layer Board*)COPPER AREABOARDTHERMAL RESISTANCETOPSIDEBACKSIDEAREAJUNCTION-TO -AMBIENT2500mm22500mm22500mm2125 C/W1000mm22500mm22500mm2125 C/W225mm22500mm22500mm2130 C/W100mm22500mm22500mm2135 C/W50mm22500mm22500mm2150 C/W*Each layer uses one ounce copperLOAD CURRENT (A) G01 QUIESCENT CURRENT ( A)0 LOAD CURRENT (A)LOAD CURRENT (A) = 40 CTA = 0 CTA = 40 CTA = 80 CTA = 120 CFORWARD VOLTAGE (V)4411 G020 RESISTANCE ( )

7 = 40 CTA = 0 CTA = 40 CTA = 80 CTA = 120 CTA = 40 CTA = 0 CTA = 40 CTA = 80 CTA = 120 CELECTRICAL CHARACTERISTICSThe denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25 C. (Note 6)TYPICAL PERFOR A CE CHARACTERISTICS UWTypical IQF vs ILOAD at VIN = vs ILOAD at VIN = 1: Absolute Maximum Ratings are those values beyond which the lifeof a device may be 2: The LTC4411E is guaranteed to meet performance specificationsfrom 0 C to 70 C. Specifications over the 40 C to 85 C ambientoperating temperature range are assured by design, characterization andcorrelation with statistical process 3: TJ is calculated from the ambient temperature TA and powerdissipation PD according to the following formula:TJ = TA + (PD 150 C/W)The following table lists thermal resistance for several different board sizesand copper areas.

8 All measurements were taken in still air on 3/32" FR-4board with the device mounted on 4: Quiescent current increases with load current, refer to plot of IQFvs 5: This IC includes overtemperature protection that is intended toprotect the device during momentary overload conditions. Junctiontemperature will exceed 125 C when overtemperature protection is operation above the specified maximum operating junctiontemperature may impair device 6: Current into a pin is positive and current out of a pin is voltages are referenced to and RON vs ILOAD atVIN = FU CTIO SIN (Pin 1): Ideal Diode Anode and Positive Power Supplyfor LTC4411.

9 When operating LTC4411 as a switch it mustbe bypassed with a low ESR ceramic capacitor of 1 F. X5 Rand X7R dielectrics are preferred for their superior voltageand temperature (Pin 2): Power and Signal Ground for the (Pin 3): Controlled Shutdown Pin. Weak (3 A) Pull-Down. Pull this pin high to shut down the IC. Tie to GNDto enable. Can be left floating when not in (Pin 4): Status Condition Indicator. This pin indi-cates the conducting status of the LTC4411. If the part isforward biased (VIN > VOUT + VFWD) this pin will be the part is reverse biased (VOUT > VIN + VRTO), then thispin will pull down 10 A through an open-drain.

10 Whenterminated to a high voltage through a 470k resistor, ahigh voltage indicates diode conducting. May be leftfloating or grounded when not in (Pin 5): Ideal Diode Cathode and Output of theLTC4411. Bypass OUT with a nominal 1m ESR capacitorof at least F. The LTC4411 is stable with ESRs downto . However stability improves with higher PERFOR A CE CHARACTERISTICS UWRFWD vs VSUPPLYRFWD vs Temperature atVIN = vs VREVERSE at VIN = 0V01 234 56 REVERSE VOLTAGE (V)LEAKAGE CURRENT (A)10 1 100n10n4411 G07TA = 60 CTA = 80 CTA = 100 CTA = 120 CSUPPLY VOLTAGE (V) ( ) ( C) 40 RFWD ( )1204411 G050 2020100406080 REVERSE VOLTAGE (V)01 234 56 IQROUT CURRENT (A)