Datasheet LT3071 (Analog Devices)

LT3071 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator with Analog Margining
FEATURES DESCRIPTION
n
Output Current: 5A
n The LT®3071 is a low voltage, UltraFast™ transient re-
Dropout Voltage: 85mV Typical
n sponse linear regulator. The device supplies up to 5A of
Digitally Programmable VOUT : 0.8V to 1.8V
output current with a typical dropout voltage of 85mV. n
Analog Output Margining: ±10% Range
A 0.01µF reference bypass capacitor decreases output n
Low Output Noise: 25µVRMS (10Hz to 100kHz)
voltage noise to 25µV n RMS. The LT3071’s high bandwidth
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 LT3071’s features make n Output Current Monitor: IMON = IOUT/2500 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 (15µF Minimum) Output voltage is digitally selectable in 50mV increments n over a 0.8V to 1.8V range. An analog margining function High Frequency PSRR: 30dB at 1MHz n allows the user to adjust system output voltage over a Enable Function Turns Output On/Off n continuous ±10% range. The IC incorporates a unique VIOC Pin Controls Buck Converter to Maintain Low tracking function to control a buck regulator powering Power Dissipation and Optimize Efficiency n the LT3071’s input. This tracking function drives the buck PWRGD/UVLO/Thermal Shutdown Flag n regulator to maintain the LT3071’s input voltage to VOUT Current Limit with Foldback Protection n + 300mV, minimizing power dissipation. 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
APPLICATIONS
thermal shutdown. The LT3071 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package. n FPGA and DSP Supplies n ASIC and Microprocessor Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. UltraFast and VLDO are trademarks of Linear Technology Corporation. n Servers and Storage Devices All other trademarks are the property of their respective owners. Patents pending. n Post Buck Regulation and Supply Isolation
TYPICAL APPLICATION Dropout Voltage 0.9V, 5A Regulator
150 VIN = VOUT(NOMINAL) 50k VBIAS PWRGD 2.2V TO 3.6V 120 2.2µF BIAS VIN IN 1.2V PWRGD TAGE (mV) 90 330µF V EN SENSE OUT = 1.8V VOUT VBIAS = 3.3V VO0 LT3071 OUT 0.9V 5A 60 V 2.2µF* 4.7µF* 10µF* O1 VOUT = 0.8V VO2 DROPOUT VOL VBIAS = 2.5V *X5R OR X7R CAPACITORS 30 VMON NC MARGA I 2V AT 5A MON FULL SCALE VIOC REF/BYP 0 1nF GND 0.01µF 1k 0 1 2 3 4 5 3071 TA01a OUTPUT CURRENT (A) 3071 TA01b 3071fc For more information www.linear.com/LT3071 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Revision History Typical Application Related Parts