LT3070 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator FEATURES DESCRIPTION n Output Current: 5A The LT 3070 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 output current with a typical dropout voltage of 85mV. OUT n Digital Output Margining: 1%, 3% or 5% A 0.01F reference bypass capacitor decreases output n Low Output Noise: 25V (10Hz to 100kHz) voltage noise to 25V . The LT3070s high bandwidth RMS RMS n permits the use of low ESR ceramic capacitors, saving Parallel Multiple Devices for 10A or More n bulk capacitance and cost. The LT3070s features make Precision Current Limit: 20% n it ideal for high performance FPGAs, microprocessors or 1% Accuracy Over Line, Load and Temperature n sensitive communication supply applications. Stable with Low ESR Ceramic Output Capacitors (15F Minimum) Output voltage is digitally selectable in 50mV increments n High Frequency PSRR: 30dB at 1MHz over a 0.8V to 1.8V range. A margining function allows n Enable Function Turns Output On/Off the user to adjust system output voltage in increments of n VIOC Pin Controls Buck Converter to Maintain Low 1%, 3% or 5%. The IC incorporates a unique tracking Power Dissipation and Optimize Efficiency function to control a buck regulator powering the LT3070s n PWRGD/UVLO/Thermal Shutdown Flag input. This tracking function drives the buck regulator to n Current Limit with Foldback Protection maintain the LT3070s input voltage to V + 300mV, OUT n Thermal Shutdown minimizing power dissipation. n 28-Lead (4mm 5mm 0.75mm) QFN Package Internal protection includes UVLO, reverse-current protec- tion, precision current limiting with power foldback and APPLICATIONS thermal shutdown. The LT3070 regulator is available in a n FPGA and DSP Supplies thermally enhanced 28-lead, 4mm 5mm QFN package. n ASIC and Microprocessor Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n UltraFast and VLDO are trademarks of Linear Technology Corporation. All other trademarks are Servers and Storage Devices the property of their respective owners. Patents pending. n Post Buck Regulation and Supply Isolation TYPICAL APPLICATION Dropout Voltage 0.9V, 5A Regulator 150 V = V IN OUT(NOMINAL) 50k V BIAS PWRGD 2.2V TO 3.6V 2.2F 120 BIAS V IN IN PWRGD 1.2V 90 330F EN SENSE V OUT V = 1.8V OUT LT3070 V OUT 0.9V O0 V = 3.3V BIAS 5A 2.2F* 4.7F* 10F* V O1 60 V V = 0.8V O2 OUT V = 2.5V *X5R OR X7R CAPACITORS BIAS MARGSEL 30 MARGTOL VIOC REF/BYP GND 1nF 0.01F 0 0 1 2 3 4 5 3070 TA01a OUTPUT CURRENT (A) 3070 TA01b 3070fc 1 For more information www.linear.com/LT3070 DROPOUT VOLTAGE (mV)LT3070 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 OUT Output Short-Circuit Duration...................Indefinite IN 8 15 OUT Operating Junction Temperature (Note 2) 9 10 11 12 13 14 LT3070E/LT3070I ............................. 40C to 125C LT3070MP ......................................... 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 PBF LT3070EUFD TRPBF 3070 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070IUFD PBF LT3070IUFD TRPBF 3070 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070MPUFD PBF LT3070MPUFD TRPBF 3070 28-Lead (4mm 5mm) Plastic QFN 55C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3070EUFD LT3070EUFD TR 3070 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070IUFD LT3070IUFD TR 3070 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3070MPUFD LT3070MPUFD TR 3070 28-Lead (4mm 5mm) Plastic QFN 55C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: