LT3045-1: 20V, 500mA, Ultralow Noise, - Analog Devices

1 LT3045-1130451faFor more information APPLICATION FEATURESDESCRIPTION20V, 500mA, Ultralow Noise, Ultrahigh PSRR Linear Regulator with VIOC ControlThe LT 3045-1 is a high performance low dropout linear regulator featuring LTC s Ultralow noise and ultrahigh PSRR architecture for powering noise sensitive applications. De-signed as a precision current reference followed by a high performance voltage buffer, the LT3045-1 can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB. In addition to the LT3045 feature set, the LT3045-1 incorporates a VIOC tracking function to control an upstream switching converter to maintain a constant voltage across the LT3045-1 and hence minimize power device supplies 500mA at a typical 260mV dropout voltage.

2 Operating quiescent current is nominally and drops to <<1 A in shutdown. The LT3045-1 s wide output voltage range (0V to 15V) while maintaining unity-gain operation provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capa-bility and programmable power good to indicate output voltage LT3045-1 is stable with a minimum 10 F ceramic output capacitor. Built-in protection includes reverse-battery protection, reverse- current protection, internal current limit with foldback and thermal limit with hysteresis.

3 The LT3045-1 is available in thermally enhanced 12-Lead MSOP and 3mm 3mm DFN Spectral DensityAPPLICATIONS nUltralow RMS Noise: VRMS (10Hz to 100kHz) nUltralow Spot Noise: 2nV/ Hz at 10kHz nUltrahigh PSRR: 76dB at 1 MHz nOutput current : 500mA nWide Input Voltage Range: to 20V nSingle Capacitor Improves Noise and PSRR n100 A SET Pin current : 1% Initial Accuracy nVIOC Pin Controls Upstream Regulator to Minimize Power Dissipation nSingle Resistor Programs Output Voltage nProgrammable current Limit nLow Dropout Voltage: 260mV nOutput Voltage Range: 0V to 15V nProgrammable Power Good nFast Start-Up Capability nPrecision Enable/UVLO nParallelable for Lower Noise and Higher current nInternal current Limit with Foldback nMinimum Output Capacitor: 10 F Ceramic nReverse-Battery and Reverse- current Protection n12-Lead MSOP and 3mm 3mm DFN Packages nRF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs nVery Low Noise Instrumentation nHigh Speed/High Precision Data Converters nMedical Applications.

4 Imaging, Diagnostics nPost-Regulator for Switching SuppliesL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices , Inc. Patents pending. All other trademarks are the property of their respective owners. LDOIN = = = 500mALDOOUTLDOINN oise FloorFREQUENCY (Hz) ( V/ Hz)30451 TA01b+ 100 AINEN/UVPGFBVIOCGNDOUTLT3045-1 ILIMPG10 F47 FVOUT: VARIABLEIOUT(MAX): 500mA30451 TA01a249 SETOUTSLT8608 BSTSWPGFBINEN/ FfSW = 1 MHzL: XFL4020-222 MECVLDOIN VLDOUT = 1 VLT3045-1230451faFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSIN Pin Voltage.

5 22 VVIOC Pin Voltage (Note 10) .. , 4 VEN/UV Pin Voltage .. 22 VIN-to-EN/UV 22 VPG Pin Voltage (Note 10) .. , 22 VILIM Pin Voltage (Note 10) .. , 1 VPGFB Pin Voltage (Note 10) .. , 22 VSET Pin Voltage (Note 10) .. , 16 VSET Pin current (Note 7) .. 20mAOUTS Pin Voltage (Note 10) .. , 16 VOUTS Pin current (Note 7) .. 20mA(Note 1)TOP VIEWDD PACKAGE12-LEAD (3mm 3mm) PLASTIC DFN1211891045321 OUTOUTOUTSGNDSETPGFBININVIOCEN/UVPGILIM6 713 GND TJMAX = 150 C, JA = 34 C/W, JC = C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB123456 ININVIOCEN/UVPGILIM121110987 OUTOUTOUTSGNDSETPGFBTOP VIEWMSE PACKAGE12-LEAD PLASTIC MSOP13 GND TJMAX = 150 C, JA = 33 C/W, JC = 8 C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCBORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3045 EDD-1#PBFLT3045 EDD-1#TRPBFLHBR12-Lead (3mm 3mm)

6 Plastic DFN 40 C to 125 CLT3045 IDD-1#PBFLT3045 IDD-1#TRPBFLHBR12-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT3045 EMSE-1#PBFLT3045 EMSE-1#TRPBF3045112-Lead Plastic MSOP 40 C to 125 CLT3045 IMSE-1#PBFLT3045 IMSE-1#TRPBF3045112-Lead Plastic MSOP 40 C to 125 CConsult LTC 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: Some packages are available in 500 unit reels through designated sales channels with #TRMPBF OptionsPART NUMBERVIOC FUNCTIONLT3045-1 YesLT3045 NoOUT Pin Voltage (Note 10).

7 , 16 VOUT-to-OUTS Differential (Note 14) .. Differential .. 22 VIN-to-OUTS Differential .. 22 VOutput Short-Circuit Duration ..IndefiniteOperating Junction Temperature Range (Note 9) E-Grade, I-Grade .. 40 C to 125 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 Sec) MSE Package ..300 #orderinfoLT3045-1330451faFor more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 Voltage Rangel220 VMinimum IN Pin Voltage (Note 2)ILOAD = 500mA, VIN UVLO Rising VIN UVLO 752V mVOutput Voltage RangeVIN > VOUTl015 VSET Pin current (ISET)

8 VIN = 2V, ILOAD = 1mA, VOUT = 2V < VIN < 20V, 0V < VOUT < 15V, 1mA < ILOAD < 500mA (Note 3) l99 98100 100101 102 A AFast Start-Up Set Pin CurrentVPGFB = 289mV, VIN = , VSET = Offset Voltage VOS (VOUT VSET) (Note 4)VIN = 2V, ILOAD = 1mA, VOUT = 2V < VIN < 20V, 0V < VOUT < 15V, 1mA < ILOAD < 500mA (Note 3) l 1 21 2mV mVLine Regulation: ISET Line Regulation: VOSVIN = 2V to 20V, ILOAD = 1mA, VOUT = VIN = 2V to 20V, ILOAD = 1mA, VOUT = (Note 4)l 2 3nA/V V/VLoad Regulation: ISET Load Regulation: VOSILOAD = 1mA to 500mA, VIN = 2V, VOUT = ILOAD = 1mA to 500mA, VIN = 2V, VOUT = (Note 4) l3 mVChange in ISET with VSET Change in VOS with VSET Change in ISET with VSET Change in VOS with VSETVSET = to 15V, VIN = 20V, ILOAD = 1mA VSET = to 15V, VIN = 20V, ILOAD = 1mA (Note 4) VSET = 0V to , VIN = 20V, ILOAD = 1mA VSET = 0V to , VIN = 20V, ILOAD = 1mA (Note 4)l l l l30 150 600 2nA mV nA mVDropout Voltage (Note 5)ILOAD = 1mA, 50mA l220275 330mV mVILOAD = 300mA l220280 350mV mVILOAD = 500mA l260350 450mV mVGND Pin current VIN = VOUT(NOMINAL)

9 (Note 6)ILOAD = 10 A ILOAD = 1mA ILOAD = 50mA ILOAD = 100mA ILOAD = 500mA l l l 15 4 7 25mA mA mA mA mAOutput Noise Spectral Density (Notes 4, 8)ILOAD = 500mA, Frequency = 10Hz, COUT = 10 F, CSET = F, VOUT = ILOAD = 500mA, Frequency = 10Hz, COUT = 10 F, CSET = F, VOUT 15V ILOAD = 500mA, Frequency = 10kHz, COUT = 10 F, CSET = F, VOUT 15V ILOAD = 500mA, Frequency = 10kHz, COUT = 10 F, CSET = F, 0V VOUT < 70 2 5nV/ Hz nV/ Hz nV/ Hz nV/ HzOutput RMS Noise (Notes 4, 8)ILOAD = 500mA, BW = 10Hz to 100kHz, COUT = 10 F, CSET = F, VOUT = ILOAD = 500mA, BW = 10Hz to 100kHz, COUT = 10 F, CSET = F, VOUT 15V ILOAD = 500mA, BW = 10Hz to 100kHz, COUT = 10 F, CSET = F, 0V VOUT < VRMS VRMS VRMSR eference current RMS Output Noise (Notes 4, 8)BW = 10Hz to 100kHz6nARMSR ipple Rejection VOUT 15V VIN VOUT = 2V (Avg) (Notes 4, 8)

10 VRIPPLE = 500mVP-P, fRIPPLE = 120Hz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 150mVP-P, fRIPPLE = 10kHz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 150mVP-P, fRIPPLE = 100kHz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 150mVP-P, fRIPPLE = 1 MHz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 80mVP-P, fRIPPLE = 10 MHz, ILOAD = 500mA, COUT = 10 F, CSET = F117 90 77 76 53dB dB dB dB dBRipple Rejection 0V VOUT < VIN VOUT = 2V (Avg) (Notes 4, 8)VRIPPLE = 500mVP-P, fRIPPLE = 120Hz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 50mVP-P, fRIPPLE = 10kHz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 50mVP-P, fRIPPLE = 100kHz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 50mVP-P, fRIPPLE = 1 MHz, ILOAD = 500mA, COUT = 10 F, CSET = F VRIPPLE = 50mVP-P, fRIPPLE = 10 MHz, ILOAD = 500mA, COUT = 10 F, CSET = F104 85 72 64 54dB dB dB dB dBEN/UV Pin ThresholdEN/UV Trip Point Rising (Turn-On), VIN = Pin HysteresisEN/UV Trip Point Hysteresis, VIN = 2V130mVLT3045-143