Datasheet LT3070-1 (Analog Devices)

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 VOUT : 0.8V to 1.8V
A 0.01µF reference bypass capacitor decreases output n
Digital Output Margining: ±1%, ±3% or ±5%
voltage noise to 25µVRMS. The LT3070-1 EN pin controls n
Low Output Noise: 25µVRMS (10Hz to 100kHz)
the reference soft-start behavior in comparison to the 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 LT3070-1’s 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 LT3070-1’s features make (15µF 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 1’s input. This tracking function drives the buck regulator
APPLICATIONS
to maintain the LT3070-1’s input voltage to VOUT + 300mV, 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 VIN = VOUT(NOMINAL) 50k VBIAS PWRGD 2.2V TO 3.6V 2.2µF 120 BIAS VIN IN 1.2V PWRGD 330µF EN SENSE V TAGE (mV) 90 OUT VOUT = 1.8V VO0 OUT 0.9V VBIAS = 3.3V LT3070-1 V 2.2µF* 4.7µF* 10µF* 5A O1 60 V V O2 OUT = 0.8V VBIAS = 2.5V MARGSEL *X5R OR X7R CAPACITORS DROPOUT VOL 30 MARGTOL VIOC REF/BYP 1nF GND 0.01µF 0 0 1 2 3 4 5 3070-1 TA01a OUTPUT CURRENT (A) 3070-1 TA01b Rev 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Typical Application Related Parts