LTC4446 - High Voltage High Side / Low Side N …

1 LTC444614446fTYPICAL APPLICATIONFEATURESAPPLICATIONSDESCRIPTI ONHigh Voltage High Side/Low Side N-Channel MOSFET DriverThe LTC 4446 is a high frequency high Voltage gate driver that drives two N-channel mosfets in a DC/DC converter with supply voltages up to 100V. The powerful driver ca-pability reduces switching losses in mosfets with high gate capacitance. The LTC4446 s pull-up for the top gate driver has a peak output current of and its pull-down has an output impedance of . The pull-up for the bot-tom gate driver has a peak output current of 3A and the pull-down has an output impedance of.

2 The LTC4446 is confi gured for two supply-independent inputs. The high side input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 114V above ground. The LTC4446 contains undervoltage lockout circuits that disable the external mosfets when activated. The LTC4446 is available in the thermally enhanced 8-lead MSOP LTC4446 does not have adaptive shoot-through pro-tection. For similar drivers with adaptive shoot-through protection, please refer to the chart ProtectionNoYesYesAbsolute Max TS100V100V100 VMOSFET Gate to to to UV+ UV Bootstrap Supply Voltage Up to 114Vn Wide VCC Voltage .

3 To Peak Top Gate Pull-Up Currentn 3A Peak Bottom Gate Pull-Up Currentn Top Gate Driver Pull-Downn Bottom Gate Driver Pull-Downn 5ns Top Gate Fall Time Driving 1nF Loadn 8ns Top Gate Rise Time Driving 1nF Loadn 3ns Bottom Gate Fall Time Driving 1nF Loadn 6ns Bottom Gate Rise Time Driving 1nF Loadn Drives Both High and Low Side N-Channel MOSFETsn Undervoltage Lockoutn Thermally Enhanced 8-Pin MSOP Packagen Distributed Power Architecturesn Automotive Power Suppliesn High Density Power Modulesn Telecommunication SystemsTwo Switch Forward ConverterLTC4446 Driving a 1000pF Capacitive LoadL, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

4 All other trademarks are the property of their respective owners. Protected by Patents including TO 72V(100V ABS MAX)GNDTSVCCTOSECONDARYCIRCUIT TINPLTC4446 BGPWM2(FROM CONTROLLER IC)PWM1(FROM CONTROLLER IC) TO TA01a BINP5V/DIVBG10V/DIVTINP5V/DIVTG-TS10V/DI V20ns/DIV4446 TA01bLTC444624446fPIN CONFIGURATIONABSOLUTE MAXIMUM RATINGSS upply Voltage VCC .. to 14V BOOST TS .. to 14 VTINP Voltage .. 2V to 14 VBINP Voltage .. 2V to 14 VBOOST Voltage .. to 114 VTS Voltage .. 5V to 100 VOperating Temperature Range (Note 2).

5 40 C to 85 CJunction Temperature (Note 3) .. 125 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) .. 300 C(Note 1)1234 TINPBINPVCCBG8765 TSTGBOOSTNCTOP VIEW9MS8E PACKAGE8-LEAD PLASTIC MSOPTJMAX = 125 C, JA = 40 C/W, JC = 10 C/W (NOTE 4)EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCBORDER INFORMATIONELECTRICAL CHARACTERISTICSSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSGate Driver Supply, VCCVCCO perating Supply Current TINP = BINP = 0V350550 AUVLOU ndervoltage Lockout ThresholdVCC RisingVCC Supply (BOOST TS)IBOOSTDC Supply CurrentTINP = BINP = AInput Signal (TINP, BINP)VIH(BG)

6 BG Turn-On Input ThresholdBINP Ramping (BG)BG Turn-Off Input ThresholdBINP Ramping (TG)TG Turn-On Input ThresholdTINP Ramping (TG)TG Turn-Off Input ThresholdTINP Ramping (BINP)Input Pin Bias Current 2 AHigh Side Gate Driver Output (TG)VOH(TG)TG High Output VoltageITG = 10mA, VOH(TG) = VBOOST (TG)TG Low Output VoltageITG = 100mA, VOL(TG) = VTG VTSl120220mVIPU(TG)TG Peak Pull-Up (TG)TG Pull-Down The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25 C.

7 VCC = VBOOST = 12V, VTS = GND = 0V, unless otherwise FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC4446 EMS8E#PBFLTC4446 EMS8E#TRPBFLTDPZ8-Lead Plastic MSOP 40 C to 85 CLTC4446 IMS8E#PBFLTC4446 IMS8E#TRPBFLTDPZ8-Lead Plastic MSOP 40 C to 85 CConsult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping LTC Marketing for information on non-standard lead based fi nish more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

8 Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LTC4446E is guaranteed to meet specifi cations from 0 C to 85 C. Specifi cations over the 40 C to 85 C operating temperature range are assured by design, characterization and correlation ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25 C.

9 VCC = VBOOST = 12V, VTS = GND = 0V, unless otherwise Side Gate Driver Output (BG)VOH(BG)BG High Output VoltageIBG = 10mA, VOH(BG) = VCC (BG)BG Low Output VoltageIBG = 100mAl55110mVIPU(BG)BG Peak Pull-Up Currentl23 ARDS(BG)BG Pull-Down Switching Time (BINP (TINP) is Tied to Ground While TINP (BINP) is Switching. Refer to Timing Diagram)tPLH(TG)TG Low-High (Turn-On) Propagation Delayl2545nstPHL(TG)TG High-Low (Turn-Off) Propagation Delayl2240nstPLH(BG)BG Low-High (Turn-On) Propagation Delayl1935nstPHL(BG)BG High-Low (Turn-Off) Propagation Delayl1430nstDM(BGTG)Delay Matching BG Turn-Off and TG Turn-Onl 151035nstDM(TGBG)Delay Matching TG Turn-Off and BG Turn-Onl 25 325nstr(TG)TG Output Rise Time10% 90%, CL = 1nF10% 90%, CL = 10nF880nsnstf(TG)TG Output Fall Time10% 90%, CL = 1nF10% 90%, CL = 10nF550nsnstr(BG)

10 BG Output Rise Time10% 90%, CL = 1nF10% 90%, CL = 10nF660nsnstf(BG)BG Output Fall Time10% 90%, CL = 1nF10% 90%, CL = 10nF330nsnswith statistical process controls. The LTC4446I is guaranteed over the full 40 C to 85 C operating temperature 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD JA C/W)Note 4: Failure to solder the exposed back side of the MS8E package to the PC board will result in a thermal resistance much higher than 40 PERFORMANCE CHARACTERISTICSVCC Supply Quiescent Current vs VoltageBOOST-TS Supply Quiescent Current vs VoltageVCC Supply Current vs TemperatureVCC SUPPLY Voltage (V)00 QUIESCENT CURRENT ( A)501502002506 7 8 9 10 11 12 134504446 G011001234514300350400 TINP = BINP = 0 VTINP(BINP) = 12 VTA = 25 CBOOST = 12 VTS = GNDBOOST SUPPLY Voltage (V)00 QUIESCENT CURRENT ( A)