LT3790 - 60V Synchronous 4-Switch Buck-Boost Controller

1 LT379013790faFor more information APPLICATION FEATURESDESCRIPTION60V Synchronous 4-Switch Buck-Boost ControllerThe LT 3790 is a Synchronous 4-Switch Buck-Boost volt-age/current regulator Controller . The LT3790 can regulate output voltage, output current, or input current with input voltages above, below, or equal to the output voltage. The constant-frequency, current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top FET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3790 is ideal for voltage regulator, bat-tery/super-capacitor charger applications in automotive, industrial, telecom, and even battery-powered LT3790 provides input current monitor, output current monitor, and various status flags, such as C/10 charge termination and shorted output , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

2 All other trademarks are the property of their respective (24V 5A) Buck-Boost Voltage RegulatorAPPLICATIONS n4- switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT nSynchronous Switching: Up to Efficiency nWide VIN Range: to 60V n2% Output Voltage Accuracy: VOUT < 60V n6% Output Current Accuracy: 0V VOUT < 60V nInput and Output Current Regulation with Current Monitor Outputs nNo Top FET Refresh in Buck or Boost nVOUT Disconnected from VIN During Shutdown nC/10 Charge Termination and Output Shorted Flags nCapable of 100W or Greater per IC nEasy Parallel Capability to Extend Output Power n38-Lead TSSOP with Exposed PadEfficiency vs Load Current nAutomotive, Telecom, Industrial Systems nHigh Power Battery-Powered SystemLOAD CURRENT (A)01 EFFICIENCY (%)

3 90951003790 TA01b8070608575652345 VIN = 12 VVIN = 24 VVIN = 54 VVIN12V TO58 VINTVCCTG1BG1 SNSPSNSNBST1 BST2BG2 PGNDSW2TG2 RTLT3790 SWISHORTC/10 CCM470nFIVINNVINIVINPIVINMONISMONCLKOUTP WMOUTEN/UVLOOVLOVREFPWMCTRL147k200kHzVCS YNCSSSGND1 F33nF33nF3790 F10 F50V F100V47 +220 F35V+ 51 LT379023790faFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSS upply VoltagesInput Supply (VIN) ..60 VSW1, SW2 .. 5V to 60VC/10, SHORT ..15 VEN/UVLO, IVINP, IVINN, ISP, ISN ..60 VINTVCC, (BST1-SW1), (BST2-SW2) ..6 VCCM, SYNC, RT, CTRL, OVLO, PWM ..6 VIVINMON, ISMON, FB, SS, VC, VREF.

4 6 VIVINP-IVINN, ISP-ISN, SNSP-SNSN .. , SNSN .. Junction Temperature (Notes 2, 3) LT379 0E/LT379 0I .. 40 C to 125 C LT379 0H .. 40 C to 150 C LT379 0MP .. 55 C to 150 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) ..300 C (Note 1)12345678910111213141516171819 TOP VIEWFE PACKAGE38-LEAD PLASTIC TSSOP38373635343332313029282726252423222 120 CTRLSSPWMC/10 SHORTVREFISMONIVINMONEN/UVLOIVINPIVINNVI NINTVCCTG1 BST1SW1 PGNDBG1BG2 OVLOFBVCRTSYNCCLKOUTCCMPWMOUTSGNDTEST1 SNSNSNSPISNISPTG2 NCBST2SW2 PGND39 SGND JA = 28 C/W EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCBELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2).

5 VIN = 12V, VEN/UVLO = 12V unless otherwise INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3790 EFE#PBFLT3790 EFE#TRPBFLT3790FE38-Lead Plastic TSSOP 40 C to 125 CLT3790 IFE#PBFLT3790 IFE#TRPBFLT3790FE38-Lead Plastic TSSOP 40 C to 125 CLT3790 HFE#PBFLT3790 HFE#TRPBFLT3790FE38-Lead Plastic TSSOP 40 C to 150 CLT3790 MPFE#PBFLT3790 MPFE#TRPBFLT3790FE38-Lead Plastic TSSOP 55 C to 150 CConsult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to.

6 Some packages are available in 500 unit reels through designated sales channels with #TRMPBF Operating Shutdown IQVEN/UVLO = AVIN Operating IQ (Not Switching)FB = , RT = more information CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise InputsEN/UVLO Falling Rising Hysteresis15mVEN/UVLO Input Low VoltageIVIN Drops Below 1 Pin Bias Current LowVEN/UVLO = 1V234 AEN/UVLO Pin Bias Current HighVEN/UVLO = Threshold Input Bias CurrentVCTRL = 1V2050nACTRL Latch-Off ThresholdRising455055mVCTRL Latch-Off Hysteresis13mVOVLO Rising Shutdown Falling Hysteresis75mVRegulationVREF Line Regulation < VIN < (ISP-ISN)

7 ThresholdVCTRL = 2V, VISP = 12 l58 5660 6062 64mV mVVCTRL = 1V, VISP = 12 l48 4650 5052 54mV mVVCTRL = 600mV, VISP = 12 l28 2630 3032 34mV mVVCTRL = 100mV, VISP = 12 l1 mVISP Bias CurrentVISP = 12V, VISN = AISN Bias CurrentVISP = 12V, VISN = AOutput Current Sense Common Mode Range060 VOutput Current Sense Amplifier gm1650 SISMON Monitor VoltageV(ISP-ISN) = Current Sense Threshold V(IVINP-IVINN)3V VIVINP mVIVINP Bias CurrentVIVINP = VIVINN = 12V90 AIVINN Bias CurrentVIVINP = VIVINN = 12V20 AInput Current Sense Common Mode Range360 VInput Current Sense Amplifier Monitor VoltageV(IVINP-IVINN) = Regulation Voltage VFB Line < VIN < Amplifier gm565 SFB Pin Input Bias CurrentFB in Regulation100200nAVC Standby Input Bias CurrentPWM = 0V 2020nAVSENSE(MAX) (VSNSP-SNSN)

8 Boost Buckl l42 5651 39mV mVFaultSS Pull-Up CurrentVSS = 0V14 ASS Discharge ALT379043790faFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25 C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise Falling Threshold (V(ISP-ISN))VFB = Falling Threshold (VFB)380400450mVC/10 Pin Output SHORT Pin Output SS Latch-Off Reset FrequencyRT = 147k RT = RT = 380 665200 400 700210 420 735kHz kHz kHzSYNC Frequency200700kHzSYNC Pin Resistance to GND90k SYNC Threshold VCC RegulatorINTVCC Regulation (VIN INTVCC)

9 IINTVCC = 10mA, VIN = 5V240350mVINTVCC Undervoltage Lockout Current LimitVINTVCC = 4V67mAPWMPWM Threshold Pin Resistance to GND90k PWMOUT Pull-Up Resistance1020 PWMOUT Pull-Down Resistance510 NMOS DriversTG1, TG2 Gate Driver On-Resistance Gate Pull-Up Gate Pull-DownVBST VSW = 5V BG1, BG2 Gate Driver On-Resistance Gate Pull-Up Gate Pull-DownVINTVCC = 5V 3 TG Off to BG On DelayCL = 3300pF60nsBG Off to TG On DelayCL = 3300pF60nsTG1, TG2, tOFF(MIN)RT = 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

10 Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LT3790E is guaranteed to meet performance from 0 C to 125 C junction temperature. Specification over the -40 C to 125 C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3790I is guaranteed to meet performance specifications over the 40 C to 125 C operating junction temperature range. The LT3790H is guaranteed to meet performance specifications over the 40 C to 150 C operating junction temperature range.