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LT8609S 42V, 2A/3A Peak Synchronous Step-Down Regulator ...

LT8609S1 Rev. DFor more information FeedbackTYPICAL APPLICATION FEATURESDESCRIPTION42V, 2A/3A Peak Synchronous Step-Down Regulator with A quiescent CurrentThe LT 8609S is a compact, high efficiency, high speed Synchronous monolithic Step-Down switching Regulator that consumes only A of non-switching quiescent current . The LT8609S can deliver 2A of continuous cur-rent with peak loads of 3A (<1sec) to support applications such as GSM transceivers which require high transient loads. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P.

Synchronous Step-Down Regulator with 2.5µA Quiescent Current The LT®8609S is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 1.7µA of non-switching quiescent current. The LT8609S can deliver 2A of continuous cur-rent with peak loads of 3A ( <1sec) to support applications

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Transcription of LT8609S 42V, 2A/3A Peak Synchronous Step-Down Regulator ...

1 LT8609S1 Rev. DFor more information FeedbackTYPICAL APPLICATION FEATURESDESCRIPTION42V, 2A/3A Peak Synchronous Step-Down Regulator with A quiescent CurrentThe LT 8609S is a compact, high efficiency, high speed Synchronous monolithic Step-Down switching Regulator that consumes only A of non-switching quiescent current . The LT8609S can deliver 2A of continuous cur-rent with peak loads of 3A (<1sec) to support applications such as GSM transceivers which require high transient loads. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P.

2 A SYNC pin allows synchronization to an external clock, or spread spectrum modulation of switching frequencies for low EMI operation. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program VIN undervoltage lockout or to shut down the LT8609S reducing the input supply current to 1 A. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up while the PG flag signals when VOUT is within of the programmed output voltage as well as fault conditions. The LT8609S is available in a small 16-lead 3mm 3mm LQFN package.

3 APPLICATIONS nSilent Switcher 2 Architecture nUltralow EMI Emissions on Any PCB nEliminates PCB Layout Sensitivity nInternal Bypass Capacitors Reduce Radiated EMI nOptional Spread Spectrum Modulation nWide Input Voltage Range: to 42V nUltralow quiescent current Burst Mode Operation: n< A IQ Regulating 12 VIN to nOutput Ripple <10mVP-P nHigh Efficiency 2 MHz Synchronous Operation: n>93% Efficiency at 1A, 12 VIN to 5 VOUT n2A Maximum Continuous Output, 3A Peak Transient Output nFast Minimum Switch-On Time: 45ns nAdjustable and Synchronizable: 200kHz to nAllows Use of Small Inductors nLow Dropout nPeak current Mode Operation nInternal Compensation nOutput Soft-Start and Tracking nSmall 16-Lead 3mm 3mm LQFN Package nAEC-Q100 Qualified for Automotive Applications nGeneral Purpose Step Down nLow EMI Step DownAll registered trademarks and trademarks are the property of their respective owners.

4 VINEN/UVON OFF22 TO 40V1 FVOUT5V2A182k8609S H1 , 2 MHz Step Down12 VIN to 5 VOUT EfficiencyIOUT (A)0 EFFICIENCY (%) = 2 MHzLT8609S2 Rev. DFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSVIN, EN/UV, PG ..42 VFB, TR/SS ..4 VSYNC Voltage ..6 VOperating Junction Temperature Range (Note 2) LT8609SE .. 40 to 125 C LT8609SI .. 40 to 125 CStorage Temperature Range .. 65 to 150 CMaximum Reflow (Package Body) Temper atur e ..260 C(Note 1)1211109N/CRTVCCGNDGNDN/CN/CPGEN/UVVINV INN/CSWSWN/CGNDSYNCTR/SSGNDFB12341615141 35678 TOP VIEWLQFN PACKAGE16-LEAD (3mm 3mm) LQFNJEDEC BOARD: JA = 50 C/W, JC(PAD) = 14 C/W (NOTE 4)DEMOBOARD: JA = 31 C/WEXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB17 GNDORDER INFORMATIONPART NUMBERTAPE AND REELPART MARKING*FINISH CODEPAD FINISHPACKAGE TYPE**MSL RATINGTEMPERATURE RANGE LT8609 SEV#PBFLT8609 SEV#TRPBFLGYNe4Au (RoHS)LQFN (Laminate Package with QFN Footprint3 40 C to 125 CLT8609 SIV#PBFLT8609 SIV#TRPBFLGYN 40 C to 125 CAUTOMOTIVE PRODUCTS**LT8609 SEV#WPBFLT8609 SEV#WTRPBFLGYNe4Au (RoHS)LQFN (Laminate Package with QFN Footprint3 40 C to 125 CLT8609 SIV#WPBFLT8609 SIV#WTRPBFLGYN 40 C to 125 CContact the factory for parts specified with wider operating temperature ranges.))

5 *The temperature grade is identified by a label on the shipping container. Pad or ball finish code is per IPC/JEDEC J-STD-609. Recommended PCB Assembly and Manufacturing Procedures. Package and Tray Drawings Parts ending with PBF are RoHS and WEEE compliant.** The LT8609S package has the same footprint as a standard 3mm 3mm QFN Package.**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 DFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

6 Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Absolute Maximum Ratings are those values beyond which the life of a device may be 2: The LT8609SE 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 LT8609SI is guaranteed over the full 40 C to 125 C operating junction temperature range. Note 3: This 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.

7 Continuous operation above the specified maximum operating junction temperature will reduce 4: values determined per JEDEC 51-7, 51-12. See the Applications Information Section for information on improving the thermal resistance and for actual temperature measurements of a demo board in typical operating Input Voltage l quiescent CurrentVEN/UV = 0V, VSYNC = 0V VEN/UV = 2V, Not Switching, VSYNC = 0V, VIN 36V l1 12 A AVIN current in RegulationVIN = 6V, VOUT = , Output Load = 100 A VIN = 6V, VOUT = , Output Load = 1mAl l46 48090 700 A AFeedback Reference VoltageVIN = 6V, ILOAD = 100mA VIN = 6V, ILOAD = 100mA VFeedback Voltage Line RegulationVIN = to Pin Input CurrentVFB = 1Vl 20nAMinimum On-TimeILOAD = , SYNC = 0V ILOAD =.

8 SYNC = l45 4575 60ns nsMinimum Off Time90130nsOscillator FrequencyRT = 221k, ILOAD = RT = , ILOAD = RT = , ILOAD = l l155 640 700 760 kHz MHzTop Power NMOS On-ResistanceILOAD = 1A185m Top Power NMOS current Power NMOS On-Resistance115m SW Leakage CurrentVIN = 42V, VSW = 40V5 AEN/UV Pin ThresholdEN/UV Pin Hysteresis 50mVEN/UV Pin CurrentVEN/UV = 2Vl 20nAPG Upper Threshold Offset from VFBVFB Lower Threshold Offset from VFBVFB %PG LeakageVPG = 42Vl 200nAPG Pull-Down ResistanceVPG = Sync Low Input High Input VoltageINTVCC = Source Currentl123 ATR/SS Pull-Down ResistanceFault Condition, TR/SS = Spread Spectrum Modulation FrequencyVSYNC = DFor more information ( Output, 2 MHz, Burst Mode Operation)Efficiency ( Output, 2 MHz, Burst Mode Operation)Efficiency (5V Output, 2 MHz, Burst Mode Operation)Efficiency (5V Output, 2 MHz, Burst Mode Operation)FB VoltageLoad RegulationLine RegulationNo-Load Supply current ( Output)fSW = 2 MHzVIN = 12 VVIN = 24VL = HIOUT (mA) (%)8609S G04 TEMPERATURE ( C) 50 REGULATION VOLTAGE (mV) 8609S G05 OUTPUT current (A) IN VOUT (%)8609S G06 VIN = 12 VVOUT = VOLTAGE (V) IN VOUT (%)8609S G07 ILOAD = 1 AVIN (V)0 IIN ( A) G0850402010 TEMPERATURE ( C) 50 current ( A)

9 8609S G09 VIN = 12 VVOUT = PERFORMANCE CHARACTERISTICSfSW = 2 MHzVIN = 12 VVIN = 24VL = HIOUT (A) (%)8609S G01fSW = 2 MHzVIN = 12 VVIN = 24VL = HIOUT (mA) (%)8609S G02fSW = 2 MHzVIN = 12 VVIN = 24VL = HIOUT (A) (%)8609S G03No-Load Supply current vs Temperature (Not Switching)LT8609S5 Rev. DFor more information PERFORMANCE CHARACTERISTICSSWITCH current = 1 ATOP SWBOT SWTEMPERATURE ( C) 50 30 1010305070901101301500501001502002503003 50 SWITCH DROP (mV)8609S G12 DUTY CYCLE (%) FET current LIMIT (A)8609S G10 TEMPERATURE ( C) 50 (A)8609S G11 Top FET current Limit vs Duty CycleTop FET current Limit vs TemperatureTOP SWBOT SWSWITCH current (A) DROP (mV)8609S G13 SYNC = 2V, OUTSYNC = 0V, OUTTEMPERATURE ( C) 50 30 101030507090110130150010203040506070 MINIMUM ON-TIME (ns)8609S G14 TEMPERATURE ( C) 50 30 1010305070901101301505060708090100110120 130140150 MINIMUM OFF TIME (ns)

10 8609S G15 VIN = 6 VILOAD = 1 ASwitch Drop vs TemperatureSwitch Drop vs Switch CurrentMinimum On-Time vs TemperatureMinimum Off-Time vs TemperatureDropout Voltage vs Load CurrentSwitching Frequency vs TemperatureLOAD current (A)0 DROPOUT VOLTAGE (mV) = TEMPERATURE ( C) 50 30 FREQUENCY (MHz)8609S G17LT8609S6 Rev. DFor more information PERFORMANCE CHARACTERISTICSB urst Frequency vs Load CurrentMinimum Load to Full Frequency (SYNC Float to )Frequency FoldbackSoft-Start TrackingSoft-Start current vs TemperatureVIN UVLOLOAD current (mA)0 FREQUENCY (kHz)25001000150050020000600200400L = HVOUT = = 12 VSYNC = 0V8609S G18SS VOLTAGE (V) VOLTAGE (V)8609S G21 INPUT VOLTAGE (V)8609S G190 LOAD current (mA)10040602080903050107003050204010 VOUT = 5 VfSW = 700kHzSYNC = FLOATFB VOLTAGE (V)0 FREQUENCY (kHz) G20 VIN = 12 VVOUT = = 0 VRT = ( C) 50 30 START current ( A)8609S G22 VSS = ( C) 55 VIN UVLO (V)


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