LT3094 –20V, 500mA, Ultralow Noise, Ultrahigh PSRR ...

1 LT30941 Rev. BFor more information FeedbackVIN = 5 VRSET = = 10 FCSET = FIL = 500mAFREQUENCY (Hz)101001k10k100k1M10M01530456075901051 20 PSRR (dB)3094 TA01bTYPICAL APPLICATION FEATURESDESCRIPTION 20V, 500mA, Ultralow Noise, Ultrahigh PSRR Negative Linear RegulatorThe LT 3094 is a high performance low dropout negative linear regulator featuring ADI s Ultralow noise and Ultrahigh PSRR architecture for powering noise sensitive applica-tions. The device can be easily paralleled to further reduce noise, increase output current and spread heat on a LT3094 supplies 500mA at a typical 235mV dropout voltage.

2 Operating quiescent current is nominally and drops to 3 A in shutdown. The device s wide output voltage range (0V to ) error amplifier operates in unity-gain and provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additional features are a bipolar enable pin, programmable current limit, fast start-up capability and programmable power good to indicate output voltage regulation. The regulator incorporates a tracking function to control an upstream supply to maintain a constant voltage across the LT3094 to minimize power dissipation and optimize LT3094 is stable with a minimum 10 F ceramic out-put capacitor.

3 Built-in protection includes internal current limit with foldback and thermal limit with hysteresis. The LT3094 is available in thermally enhanced 12-Lead MSOP and 3mm 3mm DFN nUltralow RMS Noise: VRMS (10Hz to 100kHz) nUltralow Spot Noise: Hz at 10kHz nUltrahigh PSRR: 74dB 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 nSingle Resistor Programs Output Voltage nProgrammable Current Limit nLow Dropout Voltage: 235mV nOutput Voltage Range: 0V to nProgrammable Power Good and Fast Start-Up nBipolar Precision Enable/UVLO Pin nVIOC Pin Controls Upstream Regulator to Minimize Power Dissipation and Optimize PSRR nMinimum Output Capacitor: 10 F Ceramic n12-Lead MSOP and 3mm 3mm DFN Packages nRF and Precision Power Supplies nVery Low Noise Instrumentation nHigh Speed/High Precision Data Converters nMedical Applications.

4 Diagnostics and Imaging nPost-Regulator for Switching SuppliesAll registered trademarks and trademarks are the property of their respective Supply Ripple RejectionLT3094 SETGND3094 TA01a +100 NOT USED IN THIS CIRCUIT: (MAX)500mAINPGVIN 5 VEN/UV10 F50k450kLT30942 Rev. BFor more information OF CONTENTS Features ..1 Applications ..1 Typical Application .. 1 Absolute Maximum Ratings ..3 Pin Configuration ..3 Order Information ..4 Electrical Characteristics ..4 Typical Performance Characteristics ..7 Pin Functions ..15 Block Diagram ..16 Applications Information ..17 Typical Applications.

5 29 Package Description ..31 Revision History ..33 Typical Application ..34 Related Parts ..34LT30943 Rev. BFor more information CONFIGURATIONABSOLUTE MAXIMUM RATINGSIN Pin Voltage with Respect to GND Pin .. 22V, Pin Voltage with Respect to IN Pin (Note 2) .. , 30V with Respect to GND Pin .. 22 VPG Pin Voltage with Respect to IN Pin (Note 2) .. , 30V with Respect to GND Pin .. , 22 VPGFB Pin Voltage with Respect to IN Pin (Note 2) .. , 30V with Respect to GND Pin .. 22 VILIM Pin Voltage with Respect to IN Pin (Note 2) .. , 22 VVIOC Pin Voltage with Respect to IN Pin (Note 2).

6 , 22V with Respect to GND Pin .. 2V, Pin Voltage with Respect to IN Pin (Note 2) .. , 22V with Respect to GND Pin .. 22V(Note 1)TOP VIEWDD PACKAGE12-LEAD (3mm 3mm) PLASTIC DFNTJMAX = 150 C, JA = 34 C/W, JC = C/WEXPOSED PAD (PIN 13) IS IN, MUST BE SOLDERED TO PCB1211891045321 OUTOUTOUTSGNDSETVIOCININEN/UVPGPGFBILIM6 713IN123456 ININEN/UVPGPGFBILIM121110987 OUTOUTOUTSGNDSETVIOCTOP VIEWMSE PACKAGE12-LEAD PLASTIC MSOPTJMAX = 150 C, JA = 33 C/W, JC = 8 C/WEXPOSED PAD (PIN 13) IS IN, MUST BE SOLDERED TO PCB13 INSET Pin Current (Note 4) .. 10mAOUTS Pin Voltage with Respect to IN Pin (Note 2).

7 , 22V with Respect to GND Pin .. 22 VOUTS Pin Current (Note 4) .. 10mASET-to-OUTS Differential (Note 5) .. 22 VOUT Pin Voltage with Respect to IN Pin (Note 2) .. , 22V with Respect to GND Pin .. 22 VOUT-to-OUTS Differential (Note 6) .. 22 VOutput Short-Circuit Duration ..IndefiniteOperating Junction Temperature Range (Note 3) E-, I-Grades .. 40 C to 125 C H-Grade .. 40 C to 150 C MP-Grade (Note 17).. 55 C to 150 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec) MSE Package Only ..300 CLT30944 Rev. BFor more information INFORMATIONELECTRICAL CHARACTERISTICSPARAMETERCONDITIONSMINTYP MAXUNITSI nput Voltage RangeILOAD = 500mA l 20 IN Pin Voltage (Note 8)ILOAD = 500mA, VIN UVLO Rising VIN UVLO Hysteresisl 130V mVSET Pin Current (ISET)VIN = , ILOAD = 1mA, VOUT = 20V < VIN < , < VOUT <0V, 1mA < ILOAD <500mA (Note 7) l99 98100 100101 102 A AFast Start-Up SET Pin CurrentVPGFB = 286mV, VIN = , VSET = Offset Voltage VOS (VOUT VSET) (Note 9)VIN = , ILOAD = 1mA, VOUT = 20V < VIN < , < VOUT <0V, 1mA < ILOAD <500mA (Note 7)

8 L 1 21 2mV mVLine Regulation: ISET Line Regulation: ISET Line Regulation: VOSVIN = to 20V, ILOAD = 1mA, VOUT = VIN = to 20V, ILOAD = 1mA, VOUT = (MP-Grade) VIN = to 20V, ILOAD = 1mA, VOUT = (Note 9)l l l 5 10 10 6nA/V nA/V V/VLoad Regulation: ISET Load Regulation: VOSILOAD = 1mA to 500mA, VIN = , VOUT = ILOAD = 1mA to 500mA, VIN = , VOUT = (Note 9) mVChange in ISET with VSET Change in VOS with VSET Change in ISET with VSET Change in VOS with VSETVSET = to , VIN = 20V, ILOAD = 1mA VSET = to , VIN = 20V, ILOAD = 1mA (Note 9) VSET = 0V to , VIN = 20V, ILOAD = 1mA VSET = 0V to , VIN = 20V, ILOAD = 1mA (Note 9)l l l l100 150 500 2nA mV nA mVDropout Voltage (Note 10)ILOAD = 1mA, 50mA l185225 275mV mVILOAD = 100mA l185230 280mV mVILOAD = 500mA l235310 410mV mVGND Pin Current VIN = VOUT(NOMINAL)

9 (Note 11)ILOAD = 10 A ILOAD = 1mA ILOAD = 50mA ILOAD = 100mA ILOAD = 500mA l l l 12 4 23mA mA mA mA mA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT3094 EDD#PBFLT3094 EDD#TRPBFLHCC12-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT3094 IDD#PBFLT3094 IDD#TRPBFLHCC12-Lead (3mm 3mm) Plastic DFN 40 C to 125 CLT3094 HDD#PBFLT3094 HDD#TRPBFLHCC12-Lead (3mm 3mm) Plastic DFN 40 C to 150 CLT3094 MPDD#PBFLT3094 MPDD#TRPBFLHCC12-Lead (3mm 3mm) Plastic DFN 55 C to 150 CLT3094 EMSE#PBFLT3094 EMSE#TRPBF309412-Lead Plastic MSOP 40 C to 125 CLT3094 IMSE#PBFLT3094 IMSE#TRPBF309412-Lead Plastic MSOP 40 C to 125 CLT3094 HMSE#PBFLT3094 HMSE#TRPBF309412-Lead Plastic MSOP 40 C to 150 CContact the factory for parts specified with wider operating temperature ranges.

10 *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 BFor more information Noise Spectral Density (Notes 9, 12)ILOAD = 500mA, Frequency = 10Hz, COUT = 10 F, CSET = F, VOUT = ILOAD = 500mA, Frequency = 10Hz, COUT = 10 F, CSET = F, VOUT ILOAD = 500mA, Frequency = 10kHz, COUT = 10 F, CSET = F, VOUT ILOAD = 500mA, Frequency = 10kHz, COUT = 10 F, CSET = F, VOUT 0V700 70 6nV/ Hz nV/ Hz nV/ Hz nV/ HzOutput RMS Noise (Notes 9, 12)