LT3070-1 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator FEATURES DESCRIPTION n Output Current: 5A The LT 3070-1 is a low voltage, UltraFast transient n Dropout Voltage: 85mV Typical response linear regulator. The device supplies up to 5A n Enable Function Soft-Starts the Reference of output current with a typical dropout voltage of 85mV. n Digitally Programmable V : 0.8V to 1.8V A 0.01F reference bypass capacitor decreases output OUT n Digital Output Margining: 1%, 3% or 5% voltage noise to 25V . The LT3070-1 EN pin controls RMS n Low Output Noise: 25V (10Hz to 100kHz) the reference soft-start behavior in comparison to the RMS n Parallel Multiple Devices for 10A or More LT3070 which controls the reference soft-start via the n Precision Current Limit: 20% BIAS pin supply voltage. The LT3070-1s high bandwidth n 1% Accuracy Over Line, Load and Temperature permits the use of low ESR ceramic capacitors, saving n Stable with Low ESR Ceramic Output Capacitors bulk capacitance and cost. The LT3070-1s features make (15F Minimum) it ideal for high performance FPGAs, microprocessors or n High Frequency PSRR: 30dB at 1MHz sensitive communication supply applications. n VIOC Pin Controls Buck Converter to Maintain Low Output voltage is digitally selectable in 50mV increments Power Dissipation and Optimize Efficiency over a 0.8V to 1.8V range. A margining function allows n PWRGD/UVLO/Thermal Shutdown Flag the user to adjust system output voltage in increments of n Current Limit with Foldback Protection 1%, 3% or 5%. The IC incorporates a unique tracking n Thermal Shutdown function to control a buck regulator powering the LT3070- n 28-Lead (4mm 5mm 0.75mm) QFN Package 1s input. This tracking function drives the buck regulator to maintain the LT3070-1s input voltage to V + 300mV, OUT APPLICATIONS minimizing power dissipation. n FPGA and DSP Supplies Internal protection includes UVLO, reverse-current protec- n ASIC and Microprocessor Supplies tion, precision current limiting with power foldback and n Servers and Storage Devices thermal shutdown. The LT3070-1 regulator is available in n Post Buck Regulation and Supply Isolation a thermally enhanced 28-lead, 4mm 5mm QFN package. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Dropout Voltage 0.9V, 5A Regulator 150 V = V IN OUT(NOMINAL) 50k V BIAS PWRGD 2.2V TO 3.6V 120 2.2F BIAS V IN IN PWRGD 1.2V 90 330F EN SENSE V = 1.8V V OUT OUT V = 3.3V V 0.9V BIAS OUT O0 5A LT3070-1 2.2F* 4.7F* 10F* 60 V O1 V = 0.8V OUT V O2 V = 2.5V BIAS *X5R OR X7R CAPACITORS MARGSEL 30 MARGTOL VIOC REF/BYP 0 GND 1nF 0.01F 0 1 2 3 4 5 OUTPUT CURRENT (A) 3070-1 TA01b 3070-1 TA01a Rev 0 1 Document Feedback For more information www.analog.com DROPOUT VOLTAGE (mV)LT3070-1 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 VIOC 1 22 MARGTOL MARGSEL, MARGTOL Input ........................ 0.3V to 4V PWRGD 2 21 MARGSEL EN Input ....................................................... 0.3V to 4V REF/BYP 3 20 GND SENSE Input ................................................. 0.3V to 4V GND 4 19 SENSE 29 VIOC, PWRGD Outputs ................................ 0.3V to 4V GND IN 5 18 OUT REF/BYP Output ........................................... 0.3V to 4V IN 6 17 OUT IN 7 16 Output Short-Circuit Duration...................Indefinite OUT 8 IN 15 OUT Operating Junction Temperature (Note 2) 9 10 11 12 13 14 LT3070-1E/LT3070-1I ........................ 40C to 125C LT3070-1MP ...................................... 55C to 125C UFD PACKAGE Storage Temperature Range .................. 65C to 150C 28-LEAD (4mm 5mm) PLASTIC QFN 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 LT3070EUFD-1 PBF LT3070EUFD-1 TRPBF 30701 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070IUFD-1 PBF LT3070IUFD-1 TRPBF 30701 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070MPUFD-1 PBF LT3070MPUFD-1 TRPBF 30701 28-Lead (4mm 5mm) Plastic QFN 55C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3070EUFD-1 LT3070EUFD-1 TR 30701 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070IUFD-1 LT3070IUFD-1 TR 30701 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070MPUFD-1 LT3070MPUFD-1 TR 30701 28-Lead (4mm 5mm) Plastic QFN 55C to 125C Consult ADI Marketing 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. Rev 0 2 For more information www.analog.com GND EN GND BIAS GND GND GND V O2 GND V O1 GND V O0