LT3071 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining FEATURES DESCRIPTION n Output Current: 5A The LT 3071 is a low voltage, UltraFast transient re- n Dropout Voltage: 85mV Typical sponse linear regulator. The device supplies up to 5A of n Digitally Programmable V : 0.8V to 1.8V OUT output current with a typical dropout voltage of 85mV. n Analog Output Margining: 10% Range A 0.01F reference bypass capacitor decreases output n Low Output Noise: 25V (10Hz to 100kHz) RMS voltage noise to 25V . The LT3071s high bandwidth RMS n Parallel Multiple Devices for 10A or More permits the use of low ESR ceramic capacitors, saving n Precision Current Limit: 20% bulk capacitance and cost. The LT3071s features make n Output Current Monitor: I = I /2500 MON OUT it ideal for high performance FPGAs, microprocessors or n 1% Accuracy Over Line, Load and Temperature sensitive communication supply applications. n Stable with Low ESR Ceramic Output Capacitors Output voltage is digitally selectable in 50mV increments (15F Minimum) over a 0.8V to 1.8V range. An analog margining function n High Frequency PSRR: 30dB at 1MHz allows the user to adjust system output voltage over a n Enable Function Turns Output On/Off continuous 10% range. The IC incorporates a unique n VIOC Pin Controls Buck Converter to Maintain Low tracking function to control a buck regulator powering Power Dissipation and Optimize Efficiency the LT3071s input. This tracking function drives the buck n PWRGD/UVLO/Thermal Shutdown Flag regulator to maintain the LT3071s input voltage to V OUT n Current Limit with Foldback Protection + 300mV, minimizing power dissipation. n Thermal Shutdown n 28-Lead (4mm 5mm 0.75mm) QFN Package Internal protection includes UVLO, reverse-current protec- tion, precision current limiting with power foldback and thermal shutdown. The LT3071 regulator is available in a APPLICATIONS thermally enhanced 28-lead, 4mm 5mm QFN package. n FPGA and DSP Supplies All registered trademarks and trademarks are the property of their respective owners. Patents n ASIC and Microprocessor Supplies pending. n Servers and Storage Devices n Post Buck Regulation and Supply Isolation TYPICAL APPLICATION Dropout Voltage 150 0.9V, 5A Regulator V = V IN OUT(NOMINAL) 50k V BIAS PWRGD 2.2V TO 3.6V 120 2.2F BIAS V IN IN PWRGD 90 1.2V 330F V = 1.8V OUT EN SENSE V OUT V = 3.3V BIAS V LT3071 OUT 0.9V O0 60 5A 2.2F* 4.7F* 10F* V O1 V = 0.8V OUT V O2 V = 2.5V BIAS *X5R OR X7R CAPACITORS 30 V MON NC 2V AT 5A MARGA I MON FULL SCALE VIOC REF/BYP 0 1k GND 1nF 0.01F 0 1 2 3 4 5 OUTPUT CURRENT (A) 3071 TA01b 3071 TA01a Rev. D 1 Document Feedback For more information www.analog.com DROPOUT VOLTAGE (mV)LT3071 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW IN, OUT ..................................................... 0.3V to 3.3V BIAS ............................................................. 0.3V to 4V 28 27 26 25 24 23 V , V , V Inputs .................................... 0.3V to 4V O2 O1 O0 1 22 VIOC MARGA MARGA Input ............................................... 0.3V to 4V PWRGD 2 21 I MON EN Input ....................................................... 0.3V to 4V REF/BYP 3 20 GND GND 4 19 SENSE Input ................................................. 0.3V to 4V SENSE 29 GND IN 5 18 OUT VIOC, PWRGD, I Outputs ....................... 0.3V to 4V MON 6 17 IN OUT REF/BYP Output ........................................... 0.3V to 4V IN 7 16 OUT Output Short-Circuit Duration .......................... Indefinite IN 8 15 OUT Operating Junction Temperature (Note 2) 9 10 11 12 13 14 LT3071E/LT3071I .............................. 40C to 125C LT3071MP ......................................... 55C to 125C UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN Storage Temperature Range .................. 65C to 150C T = 125C, = 30C/W TO 35C/W JMAX JA EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3071EUFD PBF LT3071EUFD TRPBF 3071 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3071IUFD PBF LT3071IUFD TRPBF 3071 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3071MPUFD PBF LT3071MPUFD TRPBF 3071 28-Lead (4mm 5mm) Plastic QFN 55C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3071EUFD LT3071EUFD TR 3071 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3071IUFD LT3071IUFD TR 3071 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3071MPUFD LT3071MPUFD TR 3071 28-Lead (4mm 5mm) Plastic QFN 55C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. C = 15F (Note 9), V = V + 0.3V (Note 5), V = 2.5V unless A OUT IN OUT BIAS otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS l IN Pin Voltage Range V V + 150mV, I = 5A 0.95 3.0 V IN OUT OUT l BIAS Pin Voltage Range (Note 3) 2.2 3.6 V l Regulated Output Voltage V = 0.8V, 10mA I 5A, 1.05V V 1.25V 0.792 0.800 0.808 V OUT OUT IN l V = 0.9V, 10mA I 5A, 1.15V V 1.35V 0.891 0.900 0.909 V OUT OUT IN l V = 1V, 10mA I 5A, 1.25V V 1.45V 0.990 1.000 1.010 V OUT OUT IN l V = 1.1V, 10mA I 5A, 1.35V V 1.55V 1.089 1.100 1.111 V OUT OUT IN l V = 1.2V, 10mA I 5A, 1.45V V 1.65V, V = 3.3V 1.188 1.200 1.212 V OUT OUT IN BIAS l V = 1.5V, 10mA I 5A, 1.75V V 1.95V, V = 3.3V 1.485 1.500 1.515 V OUT OUT IN BIAS l V = 1.8V, 10mA I 5A, 2.05V V 2.25V, V = 3.3V 1.782 1.800 1.818 V OUT OUT IN BIAS Rev. D 2 For more information www.analog.com GND EN GND BIAS GND GND GND V O2 GND V O1 GND V O0