Datasheet LT3072 (Analog Devices)

LT3072 Dual, Low Noise, 2.5A Programmable Output, 80mV Low Dropout Linear Regulator
FEATURES DESCRIPTION
n
Dual, Independent 2.5A Outputs
The LT®3072 is a low voltage, UltraFast™ transient n
Dropout Voltage: 80mV
response, dual channel linear regulator. The device n
Low Output Noise: 12µVRMS (10Hz to 100kHz)
supplies up to 2.5A per channel with a typical dropout n Digitally Programmable VOUT: 0.6V to 2.5V voltage of 80mV. A 0.1µF reference bypass capacitor n Output Tolerance: ±1.25%/±1.5% Over Load, Line and decreases output voltage noise to 12µVRMS. The wide Temperature bandwidth and high PSRR permit the use of small ceramic n Analog Output Margining: ±10% Range capacitors, saving bulk capacitance and cost. The LT3072 n Parallel Multiple Devices for Higher Current is ideal for high performance FPGAs, microprocessors n Programmable Precision Current Limit: ±7% and sensitive RF communication supply applications. n Output Current Monitor: IMON = IOUT/3000 Independent output voltages are digitally selectable n High Frequency PSRR: 30dB at 1MHz in 50mV increments from 0.6V to 1.2V and in 100mV n Stable with Ceramic Output Capacitors (10µF Minimum) increments from 1.2V to 2.5V. Output current monitors n VIOC Pin Controls Buck Converter to Maintain Low provide diagnostics and program the precision current Power Dissipation and Optimize Efficiency limit. The LT3072 incorporates a unique tracking fea- n PWRGD/UVLO Flags ture (VIOC) to control the upstream buck regulator(s) n Current Limit and Thermal Shutdown Protection powering the inputs. VIOC adaptively servos the buck n Temperature Monitor regulator to maintain the LT3072 input-to-output voltage n 36-Lead 4mm × 7mm QFN Package differential to 300mV at maximum load and 450mV at light load, minimizing power dissipation with less input
APPLICATIONS
capacitance. Internal protection circuitry includes UVLO, n OVLO, reverse-current protection, current limiting and FPGA, DSP and Microprocessor Power Supplies n thermal shutdown. The LT3072 is available in a low profile Low Noise RF Power Supplies n (0.75mm) 36-lead 4mm × 7mm QFN package. High-Speed Servers and Storage Devices n All registered trademarks and trademarks are the property of their respective owners. Post Buck Regulation and Supply Isolation
TYPICAL APPLICATION 2.5V/0.6V, 2.5A Regulators Dropout Voltage vs Load Current
VBIAS PWRGD 100 5V 4.7µF V BIAS BIAS 49.9k IN = VOUT(NOMINAL) VOUT = 0.6V & 2.5V EN1 PWRGD1 V VOUT1 IN1 V IN1 OUT1 BIAS = 5V 80 2.7V TO 2.5V 47µF VO1B2 SENSE1 3.45V 2.5A VO1B1 10µF* VO1B0 VMON1 REF/BYP1 IMON/LIM1 833.3mV AT 2.5A FULL-SCALE 60 0.1µF NC MARGA1 TAGE (mV) 1k 1V AT 3A CURRENT LIMIT VIOC1 1nF LT3072 EN2 PWRGD2 40 V VOUT2 IN2 IN2 OUT2 0.8V TO 0.6V 47µF VO2B2 SENSE2 3.45V 2.5A VO2B1 10µF* DROPOUT VOL VO2B0 VMON2 20 REF/BYP2 IMON/LIM2 833.3mV AT 2.5A FULL-SCALE 0.1µF NC MARGA2 1V AT 3A CURRENT LIMIT VIOC2 1k 1nF GND TEMP 0 VTEMP 0 0.5 1.0 1.5 2.0 2.5 10mV/°C 25°C = 250mV *X5R OR X7R CAPACITORS OUTPUT CURRENT (A) 3072 TA01a 3072 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Typical Application Related Parts