LTC3411 - 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

Features

• Click Here For LTC3411 Evaluation Kit
• Small 10-Lead MSOP or DFN Package
• Uses Tiny Capacitors and Inductor
• High Frequency Operation: Up to 4MHz
• High Switch Current: 1.6A
• Low R_DS(ON) Internal Switches: 0.110Ω
• High Efficiency: Up to 95%
• Stable with Ceramic Capacitors
• Current Mode Operation for Excellent Line and Load Transient Response
• Short-Circuit Protected
• Low Dropout Operation: 100% Duty Cycle
• Low Shutdown Current: I_Q ≤ 1μA
• Low Quiescent Current: 60µA
• Output Voltages from 0.8V to 5V
• Selectable Burst Mode® Operation
• Sychronizable to External Clock

Typical Application

Description

The LTC3411 is a constant frequency, synchronous, step- down DC/DC converter. Intended for medium power applications, it operates from a 2.63V to 5.5V input voltage range and has a user configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal sychronous 0.11Ω power switches with 1.6A peak current ratings provide high efficiency. The LTC3411’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3411 can be configured for automatic power saving Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. For reduced noise and RF interference, the SYNC/MODE pin can be configured to skip pulses or provide forced continuous operation.

To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle) with a low quiescent current of 60μA. In shutdown, the device draws <1μA.

Packaging

DFN-10, MS-10

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
LTC3411AEDD#PBF	DFN	10	E	$2.86	$2.00	View
LTC3411AEDD#TRPBF	DFN	10	E		$2.06	View
LTC3411AEMS#PBF	MSOP	10	E	$2.86	$2.00	View
LTC3411AEMS#TRPBF	MSOP	10	E		$2.06	View
LTC3411AIDD#PBF	DFN	10	I	$3.29	$2.30	View
LTC3411AIDD#TRPBF	DFN	10	I		$2.36	View
LTC3411AIMS#PBF	MSOP	10	I	$3.29	$2.30	View
LTC3411AIMS#TRPBF	MSOP	10	I		$2.36	View
LTC3411EDD	DFN	10	E	$3.78	$3.20	View
LTC3411EDD#PBF	DFN	10	E	$3.78	$3.20	View
LTC3411EDD#TR	DFN	10	E		$3.26	View
LTC3411EDD#TRPBF	DFN	10	E		$3.26	View
LTC3411EMS	MSOP	10	E	$3.78	$3.20	View
LTC3411EMS#PBF	MSOP	10	E	$3.78	$3.20	View
LTC3411EMS#TR	MSOP	10	E		$3.26	View
LTC3411EMS#TRPBF	MSOP	10	E		$3.26	View
LTC3411IDD#PBF	DFN	10	I	$5.36	$3.75	View
LTC3411IDD#TRPBF	DFN	10	I		$3.81	View
LTC3411IMS#PBF	MSOP	10	I	$5.36	$3.75	View
LTC3411IMS#TRPBF	MSOP	10	I		$3.81	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.

Evaluation Kits

Part Number	Description	Price
DC441A	LTC3411EMS | High Efficiency Monolithic Synchronous 1MHz Step-Down Regulator, 2.65V to 5.5V Input, 1.8V/2.5V/3.3Vout @ 1.25A	$100.00
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Applications

• Notebook Computers
• Digital Cameras
• Cellular Phones
• Handheld Instruments
• Board Mounted 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 LTC3411.
  
  
• 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.