LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator

Features

Product Training Module

• Outputs May be Paralleled for Higher Current and Heat Spreading
• Output Current: 1.1A
• Single Resistor Programs Output Voltage
• 1% Initial Accuracy of SET Pin Current
• Output Adjustable to 0V
• Low Output Noise: 40μVRMS (10Hz to 100kHz)
• Wide Input Voltage Range: 1.2V to 36V
• Low Dropout Voltage: 300mV
• <1mV Load Regulation
• <0.001%/V Line Regulation
• Minimum Load Current: 0.5mA
• Stable with 2.2μF Minimum Ceramic Output
• Capacitor
• Current Limit with Foldback and Overtemperature Protected
• Available in 8-Lead MSOP, 3mm × 3mm DFN,
  5-Lead DD-Pak, TO-220 and 3-Lead SOT-223

Typical Application

Description

The LT3080 is a 1.1A low dropout linear regulator that can be paralleled to increase output current or spread heat in surface mounted boards. Architected as a precision current source and voltage follower allows this new regulator to be used in many applications requiring high current, adjustability to zero, and no heat sink. Also the device brings out the collector of the pass transistor to allow low dropout operation —down to 300 milivolts— when used with multiple supplies.

A key feature of the LT3080 is the capability to supply a wide output voltage range. By using a reference current through a single resistor, the output voltage is programmed to any level between zero and 36V. The LT3080 is stable with 2.2µF of capacitance on the output, and the IC uses small ceramic capacitors that do not require additional ESR as is common with other regulators.

Internal protection circuitry includes current limiting and thermal limiting. The LT3080 regulator is offered in the 8-lead MSOP (with an Exposed Pad for better thermal characteristics), a 3mm x 3mm DFN, 5-lead TO-220 and a simple-to-use 3-lead SOT-223 version.

Packaging

MS-8, DFN-8, TO-220, SOT-223

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
LT3080EDD#PBF	DFN	8	E	$2.69	$1.88	View
LT3080EDD#TRPBF	DFN	8	E		$1.94	View
LT3080EDD-1#PBF	DFN	8	E	$2.69	$1.88	View
LT3080EDD-1#TRPBF	DFN	8	E		$1.94	View
LT3080EMS8E#PBF	MSOP	8	E	$2.77	$1.94	View
LT3080EMS8E#TRPBF	MSOP	8	E		$2.00	View
LT3080EMS8E-1#PBF	MSOP	8	E	$2.77	$1.94	View
LT3080EMS8E-1#TRPBF	MSOP	8	E		$2.00	View
LT3080EQ#PBF	DD PAK	5	E	$3.14	$2.20	View
LT3080EQ#TRPBF	DD PAK	5	E		$2.32	View
LT3080EST#PBF	SOT	3	E	$2.59	$1.81	View
LT3080EST#TRPBF	SOT	3	E		$1.87	View
LT3080ET#PBF	TO-220	5	E	$3.14	$2.20	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

• High Current All Surface Mount Supply
• High Efficiency Linear Regulator
• Post Regulator for Switching Supplies
• Low Parts Count Variable Voltage Supply
• Low Output Voltage Power Supplies

Simulate

LTSpice / SwitcherCAD III 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, 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 LT3080.
  
  
• Step 3. If LTspice / SwitcherCAD III 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 demonstartion circuit by selecting "Open" from the "File" menu.