FEATURES DESCRIPTIO U - analog.com

1 1 LTC1693-5 FEATURESAPPLICATIO SUDESCRIPTIOUTYPICAL APPLICATIOUHigh Speed SingleP-Channel MOSFET DrivernSingle MOSFET Driver in MSOP Peak Output Currentn16ns Rise/Fall Times at VCC = 12V, CL = 1nFnWide VCC Range: to Compatible Input with HysteresisnInput Threshold Is Independent of VCCnDriver Input Can Be Driven Above VCCnUndervoltage LockoutnThermal ShutdownThe LTC 1693-5 drives power P-channel MOSFETs athigh speed. The peak output current reduces switch-ing losses in MOSFETs with high gate LTC1693-5 is a single driver with an output polarityselect pin. The MOSFET driver offers VCC independentCMOS input thresholds with of typical hysteresis. Itcan level-shift the input logic signal up or down to the rail-to-rail VCC drive for the external LTC1693-5 contains an undervoltage lockout circuitand a thermal shutdown circuit that disables the externalP-channel MOSFET gate drive if LTC1693-5 comes in an 8-lead MSOP SuppliesnHigh Side DriversnMotor/Relay ControlnLine DriversnBattery ChargersHigh Efficiency Li-Ion Battery Charger, LTC and LT are registered trademarks of Linear Technology 73Si2305 DSMBRS130LT3 MBRS130LT3 VIN5V TO 6V22 FCDRH6D38-220NC1-CELLLi-Ion BATTERY1693-5 TA01100 F8+ + FAVX 0603ZC104 KAT1 AUSE LOW TEMPERATURECOEFFICIENT CAPACITORCHARGE RATE (DEPENDING ON VIN AND BATTERY VOLTAGE)

2 POSITION CAPACITOR CLOSE TO LTC1732 POSITION CAPACITOR CLOSE TO SENSE RESISTORBAT3 CHRGTIMER104 ACPR332 FSEL8 VCCLTC17325 GND22 FCERAMIC332 1 F2 LTC1693-5 Note 1: Absolute Maximum Ratings are those values beyond which the lifeof a device may be 2: All AC timing specificatons are guaranteed by design and are notproduction MAXIMUM RATINGSWWWUS upply Voltage (VCC) .. 14 VInputs (IN, PHASE) .. to 14 VDriver Output .. to VCC + Temperature .. 150 COperating Temperature Range .. 0 C to 70 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) .. 300 CPACKAGE/ORDER INFORMATIONWUU1234 INNCPHASEGND8765 VCCOUTNCNCTOP VIEWMS8 PACKAGE8-LEAD PLASTIC MSOPTJMAX = 150 C, JA = 200 C/ WORDER PARTNUMBERMS8 PARTMARKINGLTC1693-5 CMS8 LTSGELECTRICAL CHARACTERISTICSThe l denotes specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25 C.

3 VCC = 12V, unless otherwise noted.(Note 1)Consult factory for parts specified with wider operating temperature Voltage CurrentPHASE = 12V, IN = 0Vl200360550 AICC(SW)Switching Supply CurrentCOUT = , fIN = Input Input Pin Bias Currentl 10 AVPHPHASE Pin High Input Pin Pull-Up CurrentPHASE = 0Vl102045 AOutputVOHHigh Output VoltageIOUT = Output VoltageIOUT = 10mAl3075mVRONLO utput Pull-Down RONHO utput Pull-Up IPKLO utput Low Peak High Peak Timing (Note 2)tRISEO utput Rise TimeCOUT = = Fall TimeCOUT = = Low-High Propagation DelayCOUT = = High-Low Propagation DelayCOUT = 1nFl3270nsCOUT = PERFOR A CE CHARACTERISTICS UWIN Threshold Voltage vs VCCAMBIENT TEMPERATURE ( C)

4 50 INPUT THRESHOLD HYSTERESIS (V) = 12 VVIH-VILIN Threshold Hysteresisvs Ambient TemperatureIN Threshold Voltagevs Ambient TemperatureVCC (V) THRESHOLD VOLTAGE (V)VIHVILTA = 25 CAMBIENT TEMPERATURE ( C) 50 INPUT THRESHOLD VOLTAGE (V) = 12 VPHASE Threshold Voltage vs VCCRise/Fall Time vs VCCVCC (V)5182024810tRISEtFALL1693-5 G0516146791112121022 TIME (ns)TA = 25 CCOUT = 1nFfIN = 100kHzRise/Fall Time vs COUTP ropagation Delay vs AmbientTemperaturePropagation Delay vs VCCVCC (V)5 PHASE THRESHOLD VOLTAGE (V)4568101693-5 G0432679111210TA = 25 CVPH(H)VPH(L)AMBIENT TEMPERATURE ( C) 5010 TIME (ns)111314152017050751693-5 G0612181916 2525100125 VCC = 12 VCOUT = 1nFfIN = 100kHztRISEtFALLRise/Fall Time vs AmbientTemperatureVCC (V)510 TIME (ns)152530357551693-5 G0820689111012tPLHtPHL404550TA = 25 CCOUT = 1nFfIN = 100kHzAMBIENT TEMPERATURE ( C) 50 TIME (ns)40455025751693-5 G093530 25050tPLHtPHL1001252520 VCC = 12 VCOUT = 1nFfIN = 100kHzCOUT (pF)20 TIME (ns)40608010011001000100001693-5 G07 010120TA = 25 CVCC = 12 VfIN = 100kHztRISEtFALL4 LTC1693-5 Switching Supply Current vs COUTVOH vs Output CurrentCOUT (pF)20 SWITCHING SUPPLY CURRENT (mA)406050801001030709011001000100001693 -5 G13010750kHz500kHz200kHz100kHz25kHzTA = 25 CVCC = 12 VOUTPUT CURRENT (mA)00 VOH (mV)

5 501502002503501050701693-5 G15100300409010020306080 VOHTA = 25 CVCC = 12 VVOL vs Output CurrentOUTPUT CURRENT (mA)0 VOL (mV)10020030050150250204060801693-5 G1410010030507090TA = 25 CVCC = 12 VVOLAMBIENT TEMPERATURE ( C) 550 POWER DISSIPATION (mW)20060080010006585 10514001693-5 G16400 35 15525451251200TJ = 125 CThermal Derating CurveTYPICAL PERFOR A CE CHARACTERISTICS UWOutput Saturation Voltagevs TemperaturePropagation Delay vs COUTTEMPERATURE ( C) 550 OUTPUT SATURATION VOLTAGE (mV)50100150200 35 155251693-5 G11456585 105 125 VOH (50mA) wrt VCCVOH (10mA) wrt VCCVOL (50mA)VOL (10mA)VCC = 12 VQuiescent Current vs VCCCOUT (pF)30 TIME (ns)405011001000100001693-5 G102010TA = 25 CVCC = 12 VfIN = 100kHztPLHtPHLVCC (V)56100 QUIESCENT CURRENT ( A)20035079101693-5 G1215030025081112TA = 25 CVIN = 0V5 LTC1693-5 PIN FUNCTIONSUUUIN (Pin 1): Driver Input.

6 The input has VCC independentthresholds with hysteresis to improve noise (Pins 2, 5, 6): No (Pin 3): Output Polarity Select. Connect this pin toVCC or leave it floating for noninverting operation. Groundthis pin for inverting operation. The typical PHASE pininput current when pulled low is 20 (Pin 4): Driver Ground. Connect to a low impedanceground. The VCC bypass capacitor should connect directlyto this (Pin 7): Driver (Pin 8): Power Supply Input. The source of the exter-nal P-MOSFET should also connect directly to this minimizes the AC current path and improves I G DIAGRAUWWVIH90%10%90%10%trtfINPUTNONINVE RTINGOUTPUT OPERATIONINVERTINGOUTPUT OPERATIONINPUT RISE/FALL TIME < 10nsVILtftPLHtPHLtPLH1693-5 TDtrtPHL6 LTC1693-5 APPLICATIONS INFORMATIONWUUUO verviewThe LTC1693-5 single driver allows 3V- or 5V-based digi-tal circuits to drive power P-channel MOSFETs at highspeeds.

7 A power MOSFET s gate-charge loss increases withswitching frequency and transition time. The LTC1693-5is capable of driving a 1nF load with 16ns rise and fall timesusing a VCC of 12V. This eliminates the need for highervoltage supplies, such as 18V, to reduce the gate LTC1693-5 s 360 A quiescent current is an order ofmagnitude lower than most other drivers/buffers. Thisimproves system efficiency in both standby and switchingoperation. Since a power MOSFET generally accounts forthe majority of power loss in a converter, addition of theLT1693-5 to a high power converter design greatly im-proves efficiency, using very little board StageThe LTC1693-5 employs 3V CMOS compatible input thresh-olds that allow a low voltage digital signal to drive standardpower P-channel MOSFETs.

8 The LTC1693-5 incorporatesa 4V internal regulator to bias the input buffer. This allowsthe 3V CMOS compatible input thresholds (VIH = , VIL= ) to be independent of variations in VCC. The between VIH and VIL eliminates false triggeringdue to ground noise during switching transitions. TheLTC1693-5 s input buffer has a high input impedance anddraws less than 10 A during StageThe LTC1693-5 s output stage is essentially a CMOS inverter, as shown by the P- and N-channel MOSFETs inFigure 1 (P1 and N1). The CMOS inverter swings rail-to-rail, giving maximum voltage drive to the load. This largevoltage swing is important in driving external powerP-channel MOSFETs, whose RDS(ON) is inversely propor-tional to its gate overdrive voltage (VGS VT).

9 P1 CGSPOWERMOSFETCGDOUTGNDLTC1693-5 LOAD1693-5 F01N1 VCCF igure 1. Capacitance Seen by OUT During SwitchingThe LTC1693-5 s peak output currents are (P1) (N1) respectively. The N-channel MOSFET (N1) hashigher current drive capability so it can charge the powerMOSFET s gate capacitance during high-to-low signaltransitions. When the power MOSFET s gate is pulled highby the LTC1693-5, its drain voltage is pulled low by its load( , a resistor or inductor). The slew rate of the drainvoltage causes current to flow back to the MOSFETs gatethrough its gate-to-drain capacitance. If the MOSFET driver does not have sufficient source current capability(low output impedance), the current through the powerMOSFET s Miller capacitance (CGD) can momentarily pullthe gate low, turning the MOSFET back TimeSince the power MOSFET generally accounts for the ma-jority of power lost in a converter, it s important to quicklyturn it either fully on or off thereby minimizing the tran-sition time in its linear region.

10 The LTC1693-5 has rise andfall times on the order of 16ns, delivering about to peak current to a 1nF load with a VCC of only LTC1693-5 rise and fall times are determined by thepeak current capabilities of P1 and N1. The predriver,shown in Figure 1 driving P1 and N1, uses an adaptivemethod to minimize cross-conduction currents. This isdone with a 6ns nonoverlapping transition time. N1 is fullyturned off before P1 is turned-on and vice-versa using this6ns buffer time. This minimizes any cross-conductioncurrents while N1 and P1 are switching on and off yet isshort enough to not prolong their rise and fall and Thermal ShutdownThe LTC1693-5 s UVLO detector disables the input bufferand pulls the output pin to VCC if VCC < 4V.