LT3070 − 5A, Low Noise, Programmable Output, 85mV …

1 LT307013070fcFor more information nFPGA and DSP Supplies nASIC and Microprocessor Supplies nServers and Storage Devices nPost Buck Regulation and Supply IsolationTYPICAL APPLICATIONDESCRIPTION5A, Low Noise, Programmable Output, 85mV Dropout Linear RegulatorThe LT 3070 is a low voltage, UltraFast transient re-sponse linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A F reference bypass capacitor decreases output voltage noise to 25 VRMS. The LT3070 s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3070 s features make it ideal for high performance FPGAs, microprocessors or sensitive communication supply applications. Output voltage is digitally selectable in 50mV increments over a to range. A margining function allows the user to adjust system output voltage in increments of 1%, 3% or 5%.

2 The IC incorporates a unique tracking function to control a buck regulator powering the LT3070 s input. This tracking function drives the buck regulator to maintain the LT3070 s input voltage to VOUT + 300mV, minimizing power dissipation. Internal protection includes UVLO, reverse-current protec-tion, precision current limiting with power foldback and thermal shutdown. The LT3070 regulator is available in a thermally enhanced 28-lead, 4mm 5mm QFN , 5A RegulatorFEATURES nOutput Current: 5A nDropout Voltage: 85mV Typical nDigitally Programmable VOUT : to nDigital Output Margining: 1%, 3% or 5% nLow Output Noise: 25 VRMS (10Hz to 100kHz) nParallel Multiple Devices for 10A or More nPrecision Current Limit: 20% n 1% Accuracy Over Line, Load and Temperature nStable with Low ESR Ceramic Output Capacitors (15 F Minimum) nHigh Frequency PSRR.

3 30dB at 1 MHz nEnable Function Turns Output On/Off nVIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency nPWRGD/UVLO/Thermal Shutdown Flag nCurrent Limit with Foldback Protection nThermal Shutdown n28-Lead (4mm 5mm ) QFN PackageDropout VoltageBIAS50kLT3070 INENVO0VO1330 F* F**X5R OR X7R CAPACITORS3070 TA01a10 F* TO , LT, LT C, LT M, Linear Technology and the Linear logo are registered trademarks and UltraFast and VLDO are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents CURRENT (A)0 DROPOUT VOLTAGE (mV)9012015043070 TA01b603001235 VOUT = = = = = VOUT(NOMINAL)LT307023070fcFor more information , OUT .. to .. to 4 VVO2, VO1, VO0 Inputs .. to 4 VMARGSEL, MARGTOL Input .. to 4 VEN Input .. to 4 VSENSE Input .. to 4 VVIOC, PWRGD Outputs.

4 To 4 VREF/BYP Output .. to 4 VOutput Short-Circuit Junction Temper atur e (Note 2) LT3070E/ LT3070I .. 40 C to 125 C LT3070MP .. 55 C to 125 CStorage Temper atur e Range .. 65 C to 150 C(Note 1)910 TOP VIEW29 GNDUFD PACKAGE28-LEAD (4mm 5mm) PLASTIC QFN11121328 27 26 25 241423654321 VIOCPWRGDREF/BYPGNDININININMARGTOLMARGSE LGNDSENSEOUTOUTOUTOUTENBIASGNDVO2VO1VO0 GNDGNDGNDGNDGNDGND717181920212216815 TJMAX = 125 C, JA = 30 C/W TO 35 C/W EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCBORDER INFORMATIONPIN CONFIGURATIONABSOLUTE MAXIMUM RATINGSLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3070 EUFD#PBFLT3070 EUFD#TRPBF307028-Lead (4mm 5mm) Plastic QFN 40 C to 125 CLT3070 IUFD#PBFLT3070 IUFD#TRPBF307028-Lead (4mm 5mm) Plastic QFN 40 C to 125 CLT3070 MPUFD#PBFLT3070 MPUFD#TRPBF307028-Lead (4mm 5mm) Plastic QFN 55 C to 125 CLEAD BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3070 EUFDLT3070 EUFD#TR307028-Lead (4mm 5mm)

5 Plastic QFN 40 C to 125 CLT3070 IUFDLT3070 IUFD#TR307028-Lead (4mm 5mm) Plastic QFN 40 C to 125 CLT3070 MPUFDLT3070 MPUFD#TR307028-Lead (4mm 5mm) Plastic QFN 55 C to 125 CConsult LT C 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: more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. COUT = 15 F (Note 9), VIN = VOUT + (Note 5), VBIAS = unless otherwise Pin Voltage RangeVIN VOUT + 150mV, IOUT= Pin Voltage Range (Note 3) Output VoltageVOUT = , 10mA IOUT 5A, VIN VOUT = , 10mA IOUT 5A, VIN VOUT = 1V, 10mA IOUT 5A, VIN VOUT = , 10mA IOUT 5A, VIN VOUT = , 10mA IOUT 5A, VIN , VBIAS = VOUT = , 10mA IOUT 5A, VIN , VBIAS = VOUT = , 10mA IOUT 5A, VIN , VBIAS = l l l l l V V V V V VRegulated Output Voltage Margining (Note 3)

6 MARGTOL = 0V, MARGSEL = VBIAS MARGTOL = 0V, MARGSEL = 0V, IOUT = 10mAl %MARGTOL = FLOAT, MARGSEL = VBIAS MARGTOL = FLOAT, MARGSEL = 0V, IOUT = 10mAl %MARGTOL = VBIAS, MARGSEL= VBIAS MARGTOL = VBIAS, MARGSEL = 0V, IOUT = 10mAl %Line Regulation to VINVOUT = , VIN = to , VBIAS = , IOUT = 10mA VOUT = , VIN = to , VBIAS = , IOUT = 10mAl mVLine Regulation to VBIASVOUT = , VBIAS = to , VIN = , IOUT = 10mA VOUT = , VBIAS = to , VIN = , IOUT = 10mAl mVLoad Regulation, IOUT = 10mA to 5 AVBIAS = , VIN = , VOUT = l mVVBIAS = , VIN = , VOUT = l 2 mVVBIAS = , VIN = , VOUT = l 2 mVVBIAS = , VIN = , VOUT = l mVVBIAS = , VIN = , VOUT = l 3 13mV mVDropout Voltage, VIN = VOUT(NOMINAL) (Note 6)IOUT = 1A, VOUT = 1Vl2035mVIOUT = , VOUT = 1V l5065 85mV mVIOUT = 5A, VOUT = 1V l85120 150mV mVSENSE Pin CurrentVIN = , VSENSE = VBIAS = , VIN = , VSENSE = l35 20050 30065 400 A ALT307043070fcFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

7 COUT = 15 F (Note 9), VIN = VOUT + (Note 5), VBIAS = unless otherwise Pin Current, VIN = , VOUT = 1 VIOUT = 10mA IOUT = 5Al mABIAS Pin Current in Nap Mode EN = Lowl120200320 ABIAS Pin Current, VIN = , VOUT = 1V IOUT = 10mA IOUT = 100mA IOUT = 500mA IOUT = 1A IOUT = IOUT = 5Al l l l l mA mA mA mA mACurrent Limit (Note 5)VIN VOUT < , VBIAS = VIN VOUT = , VBIAS = VIN VOUT = , VBIAS = l A AReverse Output Current (Note 8)VIN = 0V, VOUT = APWRGD VOUT ThresholdPercentage of VOUT(NOMINAL), VOUT Rising Percentage of VOUT(NOMINAL), VOUT Fallingl l87 8290 8593 88% %PWRGD VOLIPWRGD = 200 A (Fault Condition)l50150mVVBIAS Undervoltage Lockout VBIAS Rising VBIAS Fallingl VVIN-VOUT Servo Voltage by VIOCl250300350mVVIOC Output CurrentVIN = VOUT(NOMINAL) + 150mV, Sourcing Out of the Pin VIN = VOUT(NOMINAL) + 450mV, Sinking Into the Pinl l160 170235 255310 340 A AVIL Input Threshold (Logic-0 State), VO2, VO1, VO0, MARGSEL, MARGTOLI nput Input Range (Logic-Z State), VO2, VO1, VO0, MARGSEL, Input Threshold (Logic-1 State), VO2, VO1, VO0, MARGSEL, MARGTOLI nput RisinglVBIAS Hysteresis (Both Thresholds)

8 , VO2, VO1, VO0, MARGSEL, MARGTOL60mVInput Current High, VO2, VO1, VO0, MARGSEL, MARGTOL VIH = VBIAS = , Current Flows Into Pinl2540 AInput Current Low, VO2, VO1, VO0, MARGSEL, MARGTOL VIL = 0V, VBIAS = , Current Flows Out of Pinl2540 AEN Pin ThresholdVOUT = Off to On, VBIAS = VOUT = On to Off, VBIAS = VOUT = Off to On, VBIAS = to VOUT = On to Off, VBIAS = to l l l VBIASV V V VEN Pin Logic High CurrentVEN = VBIAS = ALT307053070fcFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. COUT = 15 F (Note 9), VIN = VOUT + (Note 5), VBIAS = unless otherwise Pin Logic Low CurrentVEN = AVBIAS Ripple RejectionVBIAS = VOUT + , VRIPPLE = , fRIPPLE = 120Hz, VIN VOUT = 300mV, IOUT = Ripple Rejection (Notes 3, 4, 5)VBIAS = , VRIPPLE = 50mVP-P , fRIPPLE = 120Hz, VIN VOUT = 300mV, IOUT = 66dBReference Voltage Noise (REF/BYP Pin)CREF/BYP = 10nF, BW = 10Hz to 100kHz10 VRMSO utput Voltage NoiseVOUT = 1V, IOUT = 5A, CREF/BYP = 10nF, COUT = 15 F, BW = 10Hz to 100kHz 25 VRMSNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

9 Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LT3070 regulators are tested and specified under pulse load conditions such that TJ TA. The LT3070E is 100% tested at TA = 25 C. Performance at 40 C and 125 C is assured by design, characterization and correlation with statistical process controls. The LT3070I is guaranteed over the 40 C to 125 C operating junction temperature range. The LT3070MP is 100% tested and guaranteed over the 55 C to 125 C operating junction temperature range. Note 3: To maintain proper performance and regulation, the BIAS supply voltage must be higher than the IN supply voltage. For a given VOUT , the BIAS voltage must satisfy the following conditions: VBIAS and VBIAS ( VOUT + 1V). For VOUT , the minimum BIAS voltage is limited to 4: Operating conditions are limited by maximum junction temperature.

10 The regulated output voltage specification does not apply for all possible combinations of input voltage and output current. When operating at maximum output current, limit the input voltage range to VIN < VOUT + 5: The LT3070 incorporates safe operating area protection circuitry. Current limit decreases as the VIN-VOUT voltage increases. Current limit foldback starts at VIN VOUT > 500mV. See the Typical Performance Characteristics for a graph of Current Limit vs VIN VOUT voltage. The current limit foldback feature is independent of the thermal shutdown 6: Dropout voltage, VDO, is the minimum input to output voltage differential at a specified output current. In dropout, the output voltage equals VIN VDO. Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) + 300mV and a current source load. VIOC is a buffered output determined by the value of VOUT as programmed by the VO2-VO0 pins.