Features

• Output Current: 5A
• Dropout Voltage: 85mV Typical
• Digitally Programmable V_OUT : 0.8V to 1.8V
• Digital Output Margining: ±1%, ±3% or ±5%
• Low Output Noise: 25μV_RMS (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

Description

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 25μV_RMS. 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 V_OUT + 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.