LT8330 (Rev. C) - Analog Devices

1 LT83301 Rev. CFor more information FeedbackTYPICAL APPLICATION FEATURESDESCRIPTIONLow IQ Boost/SEPIC/ Inverting Converter with 1A, 60V SwitchThe LT 8330 is a current mode DC/DC converter capable of generating either positive or negative output voltages using a single feedback pin. It can be configured as a boost, SEPIC or inverting converter consuming as low as 6 A of quiescent current. Low ripple Burst Mode opera-tion maintains high efficiency down to very low output currents while keeping the output ripple below 15mV in a typical application. The internally compensated current mode architecture results in stable operation over a wide range of input and output voltages. Integrated soft-start and frequency foldback functions are included to control inductor current during start-up. The LT8330 comes in small package options that, combined with a high switching frequency of 2 MHz, help maintain a small foot print for an overall efficient, space-saving and cost effective Boost ConverterAPPLICATIONS n3V to 40V Input Voltage Range nUltralow Quiescent Current and Low Ripple Burst Mode Operation.

2 IQ = 6 A n1A, 60V Power Switch nPositive or Negative Output Voltage Programming with a Single Feedback Pin nFixed 2 MHz Switching Frequency nAccurate EN/UVLO Pin Threshold nInternal Compensation and Soft-Start nLow Profile (1mm) ThinSOT Package nLow Profile ( ) 8-Lead (3mm 2mm) DFN Package nDFN Package is AEC-Q100 qualified nThinSOT Package AEC-Q100 Qualification Is in Progress nIndustrial and Automotive nTelecom nMedical Diagnostic Equipment nPortable ElectronicsEfficiency and Power LossEFFICIENCYPOWER LOSSLOAD CURRENT (mA)040801201600102030405060708090100010 02003004005006007008009001000 EFFICIENCY (%)POWER LOSS (mW)8330 F1 HVOUT48V135mAVCCINT1 MAll registered trademarks and trademarks are the property of their respective CFor more information MAXIMUM RATINGSSW ..60 VVIN, EN/UVLO ..40 VEN/UVLO Pin Above VIN Pin ..6 VINTVCC (Note 2) ..4 VFBX .. 4V(Note 1)ORDER INFORMATIONLead Free FinishTAPE AND REEL (MINI)TAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT8330ES6#TRMPBFLT8330ES6#TRPBFLTGM Q6-Lead Plastic TSOT-23 40 C to 125 CLT8330IS6#TRMPBFLT8330IS6#TRPBFLTGMQ6-L ead Plastic TSOT-23 40 C to 125 CLT8330JS6#TRMPBFLT8330JS6#TRPBFLTGMQ6-L ead Plastic TSOT-23 40 C to 150 CLT8330HS6#TRMPBFLT8330HS6#TRPBFLTGMQ6-L ead Plastic TSOT-23 40 C to 150 CLT8330 EDDB#TRMPBFLT8330 EDDB#TRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 125 CLT8330 IDDB#TRMPBFLT8330 IDDB#TRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 125 CLT8330 JDDB#TRMPBFLT8330 JDDB#TRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 150 CLT8330 HDDB#TRMPBFLT8330 HDDB#TRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 150 CAUTOMOTIVE PRODUCTS**LT8330JS6#WTRMPBFLT8330JS6#WTR PBFLTGMQ6-Lead Plastic TSOT-23 40 C to 150 CLT8330 EDDB#WTRMPBFLT8330 EDDB#WTRPBFLGRC8-Lead (3mm 2mm)

3 Plastic DFN 40 C to 125 CLT8330 IDDB#WTRMPBFLT8330 IDDB#WTRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 125 CLT8330 JDDB#WTRMPBFLT8330 JDDB#WTRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 150 CLT8330 HDDB#WTRMPBFLT8330 HDDB#WTRPBFLGRC8-Lead (3mm 2mm) Plastic DFN 40 C to 150 CTRM = 500 pieces. *Temperature grades are identified by a label on the shipping the factory for parts specified with wider operating temperature ranges. Contact the factory for information on lead based finish 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 VIEW9 DDB PACKAGE8-LEAD (3mm 2mm) PLASTIC DFN JA = 60 C/WEXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB56784321 FBXNCSWSWEN/UVLOINTVCCVINGND123654 TOP VIEWS6 PACKAGE6-LEAD PLASTIC TSOT-23 JA = 125 C/W, JC = 102 C/WVININTVCCEN/UVLOSWGNDFBXPIN CONFIGURATIONO perating Junction Temper atur e (Note 3) LT8330E, LT8330I.

4 40 C to 125 C LT8330J, LT8330H .. 40 C to 150 CStorage Temper atur e Range .. 65 C to 150 CLT83303 Rev. CFor 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 Operating Voltage Rangel340 VVIN Quiescent Current at ShutdownVEN/UVLO = 22 5 A AVEN/UVLO = l2 A AVIN Quiescent CurrentSleep Mode, Not Switching 15 A AActive Mode, Not Switching l780 8401100 1200 A AFBX RegulationFBX Regulation VoltageFBX > 0V FBX < 0Vl VFBX Line RegulationFBX > 0V, 3V < VIN < 40V FBX < 0V, 3V < VIN < %/VFBX Pin CurrentFBX = , 1010nAOscillatorSwitching Frequency (fOSC)VIN = On-TimeVIN = 24V65105nsMinimum Off-TimeVIN = 24V4765nsSwitchMaximum Switch Current Limit RDS(ON)ISW = Switch Leakage CurrentVSW = AEN/UVLO LogicEN/UVLO Pin Threshold (Rising)Start Pin Threshold (Falling)Stop Pin CurrentVEN/UVLO = 40100nASoft-StartSoft-Start TimeVIN = 24V1msNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

5 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 LT8330E 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. The LT8330I is guaranteed over the full 40 C to 125 C operating junction temperature range. The LT8330J and LT8330H are guaranteed over the full 40 C to 150 C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125 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.

6 Continuous operation above the specified maximum operating junction temperature will reduce CFor 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 TemperatureVIN = 12 VJUNCTION TEMPERATURE ( C) 50 VOLTAGE (V)8330 G01 VIN = 12 VJUNCTION TEMPERATURE ( C) 50 250255075100125150175 VOLTAGE (V)8330 G02 VIN = 24 VJUNCTION TEMPERATURE ( C) 50 FREQUENCY (MHz)8330 G04 VIN (V) FREQUENCY (MHz)8330 G05 VIN = 24 VFBX VOLTAGE (V) SWITCHING FREQUENCY (%)8330 G06 VIN = 12 VDUTY CYCLE (%) CURRENT LIMIT (A)8330 G07 VIN = 24 VJUNCTION TEMPERATURE ( C) 50 25025507510012515017530405060708090100 MINIMUM ON TIME (ns)8330 G08 VIN = 24 VJUNCTION TEMPERATURE ( C) 50 25025507510012515017530354045505560 MINIMUM OFF TIME (ns)8330 G09 VIN = 12 VEN/UVLO RISING (TURN-ON)EN/UVLO FALLING (TURN-OFF)JUNCTION TEMPERATURE ( C) 50 PIN VOLTAGE (V)8330 G03LT83305 Rev.

7 CFor more information PERFORMANCE CHARACTERISTICSS witching Waveforms(in CCM)Switching Waveforms(in DCM/Light Burst Mode)Switching Waveforms(in Deep Burst Mode)VOUT Transient Response: Load Current Transients from to 135mA to Pin Current (Sleep Mode, Not Switching) vs TemperatureVIN Pin Current (Active Mode, Not Switching) vs TemperatureBurst Frequency vs Load CurrentVOUT Transient Response: Load Current Transients from 5mA to 135mA to 5mAVIN = 12 VJUNCTION TEMPERATURE ( C) 50 PIN CURRENT ( A)8330 G10 VIN = 12 VJUNCTION TEMPERATURE ( C) 50 2502550751001251501756006507007508008509 009501000 VIN PIN CURRENT ( A)8330 G11 VIN = 12 VVOUT = 48 VFRONT PAGE APPLICATIONLOAD CURRENT (mA) FREQUENCY (MHz)8330 G12 VIN = 12V, VOUT = 48V, ILOAD = 135mA1 s/DIVFRONT PAGE APPLICATIONVSW20V/DIVIL500mA/DIV8330 G13 VIN = 12V, VOUT = 48V, ILOAD = 20mA1 s/DIVFRONT PAGE APPLICATIONVSW20V/DIV8330 G14IL500mA/DIVVIN = 12V, VOUT = 48V, ILOAD = 2mA1 s/DIVFRONT PAGE APPLICATIONVSW20V/DIV8330 G15IL500mA/DIVFRONT PAGE APPLICATIONVIN = 12 VVOUT = 48V100 s/DIVVOUT500mV/DIVIL100mA/DIV8330 G16 FRONT PAGE APPLICATIONVIN = 12 VVOUT = 48V100 s/DIVVOUT500mV/DIVIL100mA/DIV8330 G17LT83306 Rev.

8 CFor more information FUNCTIONSEN/UVLO: Shutdown and Undervoltage Detect Pin. The LT8330 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. If shutdown and UVLO features are not required, the pin can be tied directly to system : Voltage Regulation Feedback Pin for Positive or Negative Outputs. Connect this pin to a resistor divider between the output and GND. FBX reduces the switching frequency during start-up and fault conditions when FBX is close to : Ground Connection for the LT8330 . The DFN pack-age has the best thermal performance due to an exposed pad (Pin 9) on the bottom of the package.

9 This exposed pad must be soldered to a ground plane. Pin 5 of the DFN package (and Pin 2 of the TSOT package) should also be connected to a ground plane. The ground plane should be connected to large copper layers to spread heat dissipated by the : Regulated 3V Supply for Internal Loads. The INTVCC pin must be bypassed with a minimum 1 F low ESR ceramic capacitor to ground. No additional components or loading is allowed on this : No Internal Connection. Tie directly to local : The Output of Internal Power Switch. Minimize the metal trace area connected to this pin to reduce : Input Supply. This pin must be locally bypassed. Be sure to place the positive terminal of the input capacitor as close as possible to the VIN pin, and the negative terminal as close as possible to the GND CFor more information DIAGRAMGND8330 BD+ + ERROR + +A3+ A4 DRIVERM1 ILIMITRSENSEPWM COMPARATORINTVCCTJ > 170 C+ (+) ( )EN/UVLOINTERNALREFERENCEUVLOVINCINSWR4 OPTR3 OPTVINCOUTCVCCDLVOUTUVLO3V REGULATORM2LT83308 Rev.

10 CFor more information LT8330 uses a fixed frequency, current mode control scheme to provide excellent line and load regulation. Op-eration can be best understood by referring to the Block Diagram. An internal 2 MHz oscillator turns on the internal power switch at the beginning of each clock cycle. Current in the inductor then increases until the current comparator trips and turns off the power switch. The peak inductor current at which the switch turns off is controlled by the voltage on the internal VC node. The error amplifier servos the VC node by comparing the voltage on the FBX pin with an internal reference voltage ( or , depending on the chosen topology). When the load current increases it causes a reduction in the FBX pin voltage relative to the internal reference. This causes the error amplifier to increase the VC voltage until the new load current is satis-fied. In this manner, the error amplifier sets the correct peak switch current level to keep the output in LT8330 is capable of generating either a positive or negative output voltage with a single FBX pin.