LTC3307A (Rev. B)

1 LTC3307A1 Rev. CFor more information FeedbackTYPICAL APPLICATION FEATURESDESCRIPTION5V, 3A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN and x WLCSP The LTC 3307A is a very small, high efficiency, low noise, monolithic synchronous 3A step-down DC/DC converter operating from a to input supply. Using con-stant frequency, peak current mode control at switching frequencies 1 MHz to 3 MHz and minimum on-time as low as 22ns, this regulator achieves fast transient response with small external components. Silent Switcher architec-ture minimizes EMI emissions. The LTC3307A operates in forced continuous or pulse-skipping mode for low noise, or low-ripple Burst Mode operation for high efficiency at light loads, ideal for bat-tery-powered systems. The IC regulates output voltages as low as 500mV. Other features include output over-voltage protection, short-circuit protection, thermal shut-down, clock synchronization, and up to 100% duty cycle operation for low dropout .

2 The device is available in a low profile 12-lead 2mm 2mm LQFN package with exposed pad for low thermal resistance, and a 16-pin WLCSP Efficiency, 2 MHz, , 3A Step-Down ConverterEfficiency and Power Loss in Burst Mode OperationAPPLICATIONS nPin Compatible with LTC3308(4A) and LTC3309(6A) nHigh Efficiency: 8m NMOS, 31m PMOS nProgrammable Frequency 1 MHz to 3 MHz nTiny Inductor and Capacitors nPeak Current Mode Control n22ns Minimum On-Time nWide Bandwidth, Fast Transient Response nSilent Switcher Architecture nUltralow EMI Emissions nLow Ripple Burst Mode Operation with IQ of 40 A nSafely Tolerates Inductor Saturation in Overload nVIN Range: to nVOUT Range: to VIN nVOUT Accuracy: 1% Over Temperature Range nPrecision 400mV Enable Threshold, 1 A in Shutdown nPower Good, Internal Compensation and Soft-Start nThermally Enhanced 12-Lead 2mm 2mm LQFN and 16-Pin WLCSP Packages nAEC-Q100 Qualified for Automotive Applications nOptical Networking, Servers, Telecom nAutomotive, Industrial, Communications nDistributed DC Power Systems (POL) nFPGA, ASIC, P Core Supplies nBattery Operated SystemsAll registered trademarks and trademarks are the property of their respective owners.

3 1 F02013307A F470nH100k15 F = TO F0201 MODE/SYNCRTfOSC = 2 MHzVIN10nFVIN = = = 2 MHzEFFICIENCYPOWER LOSSMURATA DFE201210S-R47 MLOAD CURRENT (A) (%)POWER LOSS (W)3307A TA01bLTC3307A2 Rev. CFor more information MAXIMUM RATINGSVIN .. to 6 VEN .. to Lesser of (VIN + ) or 6 VFB .. to Lesser of (VIN + ) or 6 VMODE/SYNC .. to Lesser of (VIN + ) or 6 VRT .. to Lesser of (VIN + ) or 6 VAGND to PGND .. to + .. to 6 VIPGOOD ..5mA(Note 1)PIN CONFIGURATIONTOP VIEWAGNDENVINPGNDRTMODE/SYNCVINPGNDFBPGO ODSWSW109871234 LQFN PACKAGE12-LEAD (2mm 2mm )TJMAX = 150 C, JA = 51 C/W, JB = 12 C/W, JCBOTTOM = C/W, JCTOP = 73 C/W, JT = C/W AND VALUES DETERMINED PER JESD51-7 ON A JEDEC 2S2P PCB,EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB13 PGND1211561 ABCD234 FBAGNDPGOODRTVINENMODE/SYNCVINPGNDSWSWPG NDPGNDSWSWPGNDTOP VIEWWLCSP PACKAGECB-16-1116-PIN ( )TJMAX = 125 C, JA = 58 C/W, JCTOP = C/W, JB = C/W, JT = C/W, JB = 15 C/W AND VALUES DETERMINED PER JESD51-7 ON A JEDEC 2S2P PCBO perating Junction Temperature Range (Note 2): LTC3307AE.

4 40 C to +125 C LTC3307AI .. 40 C to +125 C LTC3307AA .. 40 C to +125 CLTC3307AJ .. 40 C to +150 CLTC3307AH .. 40 C to +150 CLTC3307 AMP .. 55 C to +150 CStorage Temperature Range .. 65 C to +150 C Maximum Reflow (Package Body) Temperature ..260 CLTC3307A3 Rev. CFor more information INFORMATIONTAPE AND REELTAPE AND REEL MINIPART MARKING*PACKAGE TYPETEMPERATURE RANGELTC3307 AEV#TRPBFLTC3307 AEV#TRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 125 CLTC3307 AIV#TRPBFLTC3307 AIV#TRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 125 CLTC3307 AJV#TRPBFLTC3307 AJV#TRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 150 CLTC3307 AHV#TRPBFLTC3307 AHV#TRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 150 CLTC3307 AMPV#TRPBFLTC3307 AMPV#TRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 55 C to 150 CLTC3307 AACBZ-R7N/A3307 AWLCSP (16-Pin Wafer Level Chip Scale Package) 40 C to 125 CAUTOMOTIVE PRODUCTS**LTC3307 AEV#WTRPBFLTC3307 AEV#WTRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 125 CLTC3307 AIV#WTRPBFLTC3307 AIV#WTRMPBFLHFRLQFN (Laminate Package with QFN Footprint)

5 40 C to 125 CLTC3307 AJV#WTRPBFLTC3307 AJV#WTRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 150 CLTC3307 AHV#WTRPBFLTC3307 AHV#WTRMPBFLHFRLQFN (Laminate Package with QFN Footprint) 40 C to 150 CContact the factory for parts specified with wider operating temperature ranges. *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 CHARACTERISTICSPARAMETERCONDITIONSMINTYP MAXUNITSI nput SupplyOperating Supply Voltage (VIN) Undervoltage Lockout VIN Undervoltage Lockout HysteresisVIN mVVIN Quiescent Current in ShutdownVEN = AVIN Quiescent CurrentBurst Mode Operation, Sleeping All Modes, Not Sleeping (Note 3)40 2 A mAEnable Threshold Enable Threshold HysteresisVEN mVEN Pin LeakageVEN = 20nAVoltage RegulationRegulated Feedback Voltage (VFB) Voltage Line RegulationVIN = to Pin Input CurrentVFB = 20nAMinimum On Time (tON,MIN)VIN = Duty Cyclel100%Top Switch ON-Resistance31m Bottom Switch ON-Resistance8m Top Switch Current Limit (IPEAKMAX)

6 VOUT/VIN The l denotes the specifications which apply over the specified operating junction temperature range (Note 2), otherwise specifications are at TA = 25 C; VIN = , VEN = VIN, unless otherwise CFor more information 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: The LTC3307A is tested under pulsed load conditions such that TJ TA. The LTC3307 AEV is guaranteed to meet specifications from 0 C to 85 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 LTC3307 AIV is guaranteed over the 40 C to 125 C operating junction temperature range. The LTC3307 AJV and LTC3307 AHV are guaranteed over the 40 C to 150 C operating junction temperature range. The LTC3307 AMPV is guaranteed over the 55 C to 150 C operating junction temperature range. The LTC3307 AACBZ specifications over the 40 C to 125 C operating junction temperature range are assured by design, characterization, and correlation with statistical process controls. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures above 125 C. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance, and other environmental factors. The junction temperature (TJ in C) is calculated from ambient temperature (TA in C) and power dissipation (PD in Watts) according to the formula:TJ = TA + (PD JA), where JA (in C/W) is the package thermal impedance.

8 See High Temperature Considerations section for more LTC3307A includes overtemperature protection that protects the device during momentary overload conditions. Junction temperatures will exceed 150 C when overtemperature protection is engaged. Continuous operation above the specified maximum operating junction temperature may impair device 3: Supply current specification does not include switching currents. Actual supply currents will be Switch Current Limit (IVALLEYMAX) Switch Reverse Current Limit (IREVMAX)Forced Continuous Mode, LQFN Forced Continuous Mode, WLCSP ASW Leakage CurrentVEN = 100nAPower Good and Soft-StartPGOOD Rising Threshold PGOOD HysteresisAs a Percentage of the Regulated VOUTl l97 %Overvoltage Rising Threshold Overvoltage HysteresisAs a Percentage of the Regulated VOUTl l107 1110 %PGOOD Delay120 sPGOOD Pull Down Resistance VPGOOD = PGOOD Leakage CurrentVPGOOD = DurationVOUT rising from 0V to PGOOD and MODE/SYNCD efault Oscillator Frequency with RT = RangeRT Programming and Synchronizationl13 MHzMinimum SYNC High or Low Pulse Widthl40nsSYNC Pulse Voltage LevelsLevel High Level Lowl VMODE/SYNC No Clock Detect Time10 sMODE/SYNC Pin ThresholdFor Programming Pulse-Skipping Mode For Programming Forced Continuous Mode For Programming Burst Mode Operationl l l VIN VIN V VELECTRICAL CHARACTERISTICS The

9 L denotes the specifications which apply over the specified operating junction temperature range (Note 2), otherwise specifications are at TA = 25 C; VIN = , VEN = VIN, unless otherwise CFor more information Switching FrequencyTYPICAL PERFORMANCE CHARACTERISTICSVIN = , TA = 25 C, unless otherwise On ResistanceSwitch On ResistanceSwitching FrequencyDefault Switching FrequencyRT Switching FrequencyFeedback VoltageMinimum On-TimeMinimum On-TimeTEMPERATURE ( C) 50 2502550751001251504954964974984995005015 02503504505 FEEDBACK VOLTAGE (mV)3307A G01150 C25 C 50 CINPUT VOLTAGE (V) ON TIME (ns)3307A G02 VIN = = = ( C) 50 2502550751001251500102030405060 MINIMUM ON TIME (ns)3307A G03 PMOSNMOSINPUT VOLTAGE (V) (ON) (m )3307A G04 VIN = ( C) 50 250255075100125150510152025303540 RDS(ON) (m )3307A G05 INPUT VOLTAGE (V) FREQUENCY (MHz)3307A G06 VIN = = = ( C) 50 FREQUENCY (MHz)3307A G07RT (k ) (MHz)3307A G08RT = VIN = = = ( C) 50 (MHz)3307A G09 LTC3307A6 Rev.

10 CFor more information UVLO ThresholdVIN Shutdown CurrentVIN Quiescent Current, Burst Mode Operation, SleepingVIN Quiescent Current All Modes, Not SleepingTYPICAL PERFORMANCE CHARACTERISTICSVIN = , TA = 25 C, unless otherwise Current LimitsEN ThresholdPMOS Current LimitSwitch LeakagePMOS Current LimitTEMPERATURE ( C) 50 CURRENT ( A)3307A G13 VIN = = = ( C) 50 250255075100125150303540455055606570 VIN CURRENT ( A)3307A G14 VIN = = = ( C) 50 CURRENT (mA)3307A G15 VIN = ( C) 50 250255075100125150012345 SWITCH LEAKAGE CURRENT ( A)3307A G16 VIN = = = 5 VDUTY CYCLE (%) CURRENT (A)PMOS Current Limit3307A G12 DUTY CYCLE = 20%NMOS IVALLEYMAXPMOS IPEAKMAXTEMPERATURE ( C) 50 CURRENT (A)3307A G10 DUTY CYCLE = 20%INPUT VOLTAGE (V) CURRENT (A)3307A G11150 C25 C 60 CEN RISINGEN FALLINGTEMPERATURE ( C) 50 2502550751001251503403503603703803904004 10EN THRESHOLD (mV)3307A G17 RISINGFALLINGTEMPERATURE ( C) 50 UVLO (V)3307A G18 LTC3307A7 Rev.