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LT3070 - 5A, Low Noise, Programmable Output, 85mV Dropout Linear Regulator

The LT3070 is a low voltage, UltraFast™ transient response linear regulator. The device supplies up to 5A of output current with a typical dropout voltage of 85mV. A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS. The LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving bulk capacitance and cost. The LT3070’s features make it ideal for high performance FPGAs, microprocessors or sensitive communication supply applications.

Output voltage is digitally selectable in 50mV increments over a 0.8V to 1.8V range. A margining function allows the user to adjust system output voltage in increments of ±1%, ±3% or ±5%. The IC incorporates a unique tracking function to control a buck regulator powering the LT3070’s input. This tracking function drives the buck regulator to maintain the LT3070’s input voltage to VOUT + 300mV, minimizing power dissipation.

Internal protection includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown. The LT3070 regulator is available in a thermally enhanced 28-lead, 4mm × 5mm QFN package.

Features Output Current: 5A Dropout Voltage: 85mV Typical Digitally Programmable VOUT : 0.8V to 1.8V Digital Output Margining: ±1%, ±3% or ±5% Low Output Noise: 25μVRMS (10Hz to 100kHz) Parallel Multiple Devices for 10A or More Precision Current Limit: ±20% ±1% Accuracy Over Line, Load and Temperature Stable with Low ESR Ceramic Output Capacitors (15μF Minimum) High Frequency PSRR: 30dB at 1MHz Enable Function Turns Output On/Off VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency PWRGD/UVLO/Thermal Shutdown Flag Current Limit with Foldback Protection Thermal Shutdown 28-Lead (4mm × 5mm × 0.75mm) QFN Package Typical Application

Applications FPGA and DSP Supplies ASIC and Microprocessor Supplies Servers and Storage Devices Post Buck Regulation and Supply Isolation Packaging

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