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

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.

Packaging

QFN-28

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LT3070EUFD#PBF	QFN	28	E	$6.00	$4.20	View
LT3070EUFD#TRPBF	QFN	28	E		$4.26	View
LT3070IUFD#PBF	QFN	28	I	$6.86	$4.80	View
LT3070IUFD#TRPBF	QFN	28	I		$4.86	View
LT3070MPUFD#PBF	QFN	28	MP	$16.20	$11.34	View
LT3070MPUFD#TRPBF	QFN	28	MP		$11.40	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

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

Simulate

LTSpice IV is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

• Step 1. If you do not already have a copy of LTSpice IV, click here to download and install LTSpice / SwitcherCAD III
  
  
• Step 2. Once LTSpice is installed, click here for a ready to run demonstration circuit of the LT3070.
  
  
• Step 3. If LTspice IV does not automatically open after clicking the above link, you can instead run the simulation by right clicking on the link and selecting “Save Target As”. After saving the file to your computer, start LTSpice and open the demonstration circuit by selecting "Open" from the "File" menu.

For our complete list of hundreds of ready to run demo circuits, visit our LTspice IV Demo Circuits Collection