LT8362 (Rev. B) - Analog Devices

1 LT83621 Rev. BFor more information FeedbackDESCRIPTIONTYPICAL APPLICATION FEATURESLow IQ Boost/SEPIC/Inverting converter with 2A, 60V SwitchThe LT 8362 is a current mode DC/DC converter with a 60V, 2A switch operating from a to 60V input. With a unique single feedback pin architecture it is capable of boost, SEPIC or inverting configurations. Burst Mode operation consumes as low as 9 A quiescent current to maintain high efficiency at very low output currents, while keeping typical output ripple below 15mV. An external compensation pin allows optimization of loop bandwidth over a wide range of input and output volt-ages and programmable switching frequencies between 300kHz and 2 MHz. A SYNC/MODE pin allows synchroni-zation to an external clock. It can also be used to select between burst or pulse-skipping modes of operation with or without Spread Spectrum Frequency Modulation for low EMI.

2 For increased efficiency, a BIAS pin can accept a second input to supply the INTVCC regulator. Additional features include frequency foldback and programmable soft-start to control inductor current during start-up. The LT8362 is available in a thermally enhanced 10-lead 3mm 3mm DFN package or a thermally enhanced 16-lead MSOP package with four pins , 48V Output Boost ConverterAPPLICATIONS nWide Input Voltage Range: to 60V nUltralow Quiescent Current and Low Ripple Burst Mode Operation: IQ = 9 A n2A, 60V Power Switch nPositive or Negative Output Voltage Programming with a Single Feedback Pin nProgrammable Frequency (300kHz to 2 MHz) nSynchronizable to an External Clock nSpread Spectrum Frequency Modulation for Low EMI nBIAS Pin for Higher Efficiency nProgrammable Undervoltage Lockout (UVLO) nThermally Enhanced 10-Lead 3mm 3mm DFN and 16-Lead MSOP packages nAEC-Q100 Qualified for Automotive Applications nIndustrial and Automotive nTelecom nMedical Diagnostic Equipment nPortable ElectronicsAll registered trademarks and trademarks are the property of their respective owners.

3 Efficiency and Power Loss8362 FVINSWEN/UVLOLT8362 VIN8V TO 38 VVOUT48V200mA AT VIN = 8V320mA AT VIN = 12V700mA AT VIN = H1 LOSSVIN = 12 VVIN = 24 VLOAD CURRENT (A) (%)POWER LOSS (W)8362 TA01bLT83622 Rev. BFor more information ..60 VVIN, EN/UVLO ..60 VBIAS ..40 VEN/UVLO Pin Above VIN Pin, ..(Note 2)VC ..4 VORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT8362 EMSE#PBFLT8362 EMSE#TRPBF836216-Lead Plastic MSOP with 4 Pins Removed 40 C to 125 CLT8362 IMSE#PBFLT8362 IMSE#TRPBF836216-Lead Plastic MSOP with 4 Pins Removed 40 C to 125 CLT8362 HMSE#PBFLT8362 HMSE#TRPBF836216-Lead Plastic MSOP with 4 Pins Removed 40 C to 150 CLT8362 EDD#PBFLT8362 EDD#TRPBFLGWZ10-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT8362 IDD#PBFLT8362 IDD#TRPBFLGWZ10-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT8362 HDD#PBFLT8362 HDD#TRPBFLGWZ10-Lead (3mm 3mm) Plastic DFN 40 C to 150 CAUTOMOTIVE PRODUCTS** LT8362 EMSE#WPBFLT8362 EMSE#WTRPBF836216-Lead Plastic MSOP with 4 Pins Removed 40 C to 125 CLT8362 IMSE#WPBFLT8362 IMSE#WTRPBF836216-Lead Plastic MSOP with 4 Pins Removed 40 C to 125 CLT8362 HMSE#WPBFLT8362 HMSE#WTRPBF836216-Lead Plastic MSOP with 4 Pins Removed 40 C to 150 CLT8362 EDD#WPBFLT8362 EDD#WTRPBFLGWZ10-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT8362 IDD#WPBFLT8362 IDD#WTRPBFLGWZ10-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT8362 HDD#WPBFLT8362 HDD#WTRPBFLGWZ10-Lead (3mm 3mm) Plastic DFN 40 C to 150 CContact the factory for parts specified with wider operating temperature ranges.

4 *The temperature grade is identified by a label on the shipping and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these CONFIGURATIONABSOLUTE MAXIMUM RATINGS(Note 1)FBX .. 4 VOperating Junction Temperature (Note 3) LT8362E, LT8 362I .. 40 C to 125 C LT8362H .. 40 C to 150 CStorage Temperature Range .. 65 C to 150 C1 3 5678EN/UVLOVININTVCCNCBIASVC16 14 1211109SW1SW2 SYNC/MODESSRTFBXTOP VIEW17 PGND, GNDMSE PACKAGEVARIATION: MSE16 (12)16-LEAD PLASTIC MSOP JA = 45 C/W, JC = 10 C/W EXPOSED PAD (PIN 17) IS PGND AND GND, MUST BE SOLDERED TO PCBTOP VIEWDD PACKAGE10-LEAD (3mm 3mm) PLASTIC DFN JA = 43 C/W EXPOSED PAD (PIN 11) IS PGND AND GND, MUST BE SOLDERED TO PCB10967845321 SWSYNC/MODESSRTFBXEN/UVLOVININTVCCBIASVC 11 PGND,GNDLT83623 Rev.

5 BFor more information Operating Voltage Quiescent Current at ShutdownVEN/UVLO = l1 12 15 A AVEN/UVLO = l2 25 25 A AVIN Quiescent CurrentSleep Mode (Not Switching)SYNC = 0V l9 915 30 A AActive Mode (Not Switching)SYNC = 0V or INTVCC, BIAS = 0V l1200 12001600 1850 A ASYNC = 0V or INTVCC, BIAS = 5V l22 2240 65 A ABIAS ThresholdRising, BIAS Can Supply INTVCC Falling, BIAS Cannot Supply VVIN Falling Threshold to Supply INTVCCBIAS = 12 VBIAS 2 VVBIAS Falling Threshold to Supply INTVCCVIN = 12 VVINVFBX RegulationFBX Regulation VoltageFBX > 0V FBX < 0Vl VFBX Line RegulationFBX > 0V, < VIN < 60V FBX < 0V, < VIN < %/VFBX Pin CurrentFBX = , 1010nAOscillatorSwitching Frequency (fOSC)RT = 165k RT = RT = 20kl l l265 1 2327 MHz MHzSSFM Maximum Frequency Deviation( f/fOSC) 100, RT = 20k142028%Minimum On-TimeBurst Mode, VIN = 24V (Note 6) Pulse-Skip Mode, VIN = 24V (Note 6)70 6090 85ns nsMinimum Off-Timel5075nsSYNC/Mode, Mode Thresholds (Note 5)High (Rising) Low (Falling)l l VSYNC/Mode, Clock Thresholds (Note 5)Rising Fallingl l VfSYNC/fOSC Allowed RatioRT = Pin CurrentSYNC = 2V SYNC = 0V, Current Out of Pin10 1025 25 A ASwitchMaximum Switch Current Limit Overcurrent ThresholdDischarges SS RDS(ON)ISW = Switch Leakage CurrentVSW = AELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

6 VIN = 12V, EN/UVLO = 12V unless otherwise BFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VIN = 12V, EN/UVLO = 12V unless otherwise 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: INTVCC cannot be externally driven. No additional components or loading is allowed on this 3: The LT8362E is guaranteed to meet performance specifications from 0 C to 125 C junction temperature. Specifications over the 40 C to 125 C operating junction temperature range are assured by design, characterization and correlation with statistical process controls.

7 The LT8362I is guaranteed over the full 40 C to 125 C operating junction temperature range. The LT8362H is guaranteed over the full 40 C to 150 C operating junction temperature 4: The IC includes overtemperature protection that is intended to protect the device during overload conditions. Junction temperature will exceed 150 C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature will reduce 5: For SYNC/MODE inputs required to select modes of operation see the Pin Functions and Applications Information 6: The IC is tested in a Boost converter configuration with the output voltage programmed for LogicEN/UVLO Pin Threshold (Rising)Start Pin Threshold (Falling)Stop Pin CurrentVEN/UVLO = 5050nASoft-StartSoft-Start Charge CurrentSS = ASoft-Start Pull-Down ResistanceFault Condition, SS = Error AmplifierError Amplifier TransconductanceFBX = FBX = 60 A/V A/VError Amplifier Voltage GainFBX = FBX = 145V/V V/VError Amplifier Max Source CurrentVC = , Current Out of Pin7 AError Amplifier Max Sink CurrentVC = ALT83625 Rev.

8 BFor more information PERFORMANCE CHARACTERISTICSS witching Frequency vs TemperatureSwitching Frequency vs VINN ormalized Switching Frequency vs FBX VoltageSwitch Current Limit vs Duty CycleSwitch Minimum On-Time vs TemperatureSwitch Minimum Off-Time vs TemperatureFBX Positive Regulation Voltagevs TemperatureFBX Negative Regulation Voltage vs TemperatureEN/UVLO Pin Thresholds vs TemperatureJUNCTION TEMPERATURE ( C) 50 VOLTAGE (V)8362 G01 VIN = 12 VJUNCTION TEMPERATURE ( C) 50 250255075100125150175 VOLTAGE (V)8362 G02 VIN = 12 VEN/UVLO RISING (TURN ON)EN/UVLO FALLING (TURN OFF)JUNCTION TEMPERATURE ( C) 50 PIN VOLTAGE (V)8362 G03 JUNCTION TEMPERATURE ( C) 50 FREQUENCY (MHz)8362 G04 VIN = 12 VVIN (V) FREQUENCY (MHz)8362 G05 VOLTAGE (V) SWITCHING FREQUENCY (%)8362 G06 VIN = 12 VDUTY CYCLE (%) CURRENT LIMIT (A)8362 G07 VIN = 12 VJUNCTION TEMPERATURE ( C) 50 2502550751001251501750102030405060708090 100 MINIMUM ON TIME (ns)8362 G08 VIN = 12 VVIN = 12 VJUNCTION TEMPERATURE ( C) 50 2502550751001251501750102030405060708090 100 MINIMUM OFF TIME (ns)8362 G09LT83626 Rev.

9 BFor more information PERFORMANCE CHARACTERISTICSS witching Waveforms(in CCM)Switching Waveforms(in DCM/Light Burst Mode)Switching Waveforms(in Deep Burst Mode)Burst Frequency vs Load CurrentVOUT Transient Response: LoadCurrent Transients from 160mA to 320mA to 160mAVOUT Transient Response: LoadCurrent Transients from 80mA to 320mA to 80mAVIN Pin Current (Sleep Mode, Not Switching) vs TemperatureVIN Pin Current (Active Mode, Not Switching, Bias = 0V) vs TemperatureVIN Pin Current (Active Mode, Not Switching, Bias = 5V) vs TemperatureVIN = 12V VBIAS = 0V VSYNC_MODE = 0 VJUNCTION TEMPERATURE ( C) 50 250255075100125150175036912151821242730 VIN PIN CURRENT ( A)8362 G10 VIN = 12V VBIAS = 0V VSYNC_MODE = FLOATJUNCTION TEMPERATURE ( C) 50 PIN CURRENT (mA)8362 G11 VIN = 12V VBIAS = 5V VSYNC_MODE = FLOATJUNCTION TEMPERATURE ( C) 50 2502550751001251501751014182226303438424 650 VIN PIN CURRENT ( A)

10 8362 G121 s/DIVVSW20V/DIVIL500mA/DIV8362 G131 s/DIVVSW20V/DIVIL500mA/DIV8362 G141 s/DIVVSW20V/DIVIL500mA/DIV8362 G15 VIN = 12 VVOUT = 48 VFRONT PAGE APPLICATION100 s/DIVVOUT500mV/DIVIOUT200mA/DIV8362 G16 VIN = 12 VVOUT = 48 VFRONT PAGE APPLICATION100 s/DIVVOUT500mV/DIVIOUT200mA/DIV8362 G17 LOAD CURRENT (mA) FREQUENCY (MHz)8362 G18 VIN = 12 VVOUT = 48 VFRONT PAGE APPLICATIONLT83627 Rev. BFor more information FUNCTIONSEN/UVLO: Shutdown and Undervoltage Detect Pin. The LT8362 is shut down when this pin is low and active when this pin is high. Below an accurate threshold, the part enters undervoltage lockout and stops switching. This allows an undervoltage lockout (UVLO) threshold to be programmed for system input voltage by resistively dividing down system input voltage to the EN/UVLO pin. An 80mV pin hysteresis ensures part switching resumes when the pin exceeds EN/UVLO pin voltage below reduces VIN current below 1 A.