LT3663 - 1.2A Step-Down Switching Regulator with Output Current Limit

Features

• Wide Input Range:
  Operation from 7.5V to 36V
  Overvoltage Lockout Protects Circuit through 60V Transients
• Programmable Output Current Limit (0.4A to 1.2A)
• 3.3V and 5V Fixed Output Voltage Options
• Integrated Boost Diode
• Fixed Frequency, Peak Current Mode Control
  LT3663 f_SW = 1.5MHz
  LT3663-X f_SW = 1MHZ
• Low Switch V_CESAT: 275mV at 1A
• Internally Compensated
• Thermal Protection
• Thermally Enhanced 8-Pin 2mm × 3mm DFN and
MSOP Packages

Typical Application

Description

The LT®3663 is a current mode step-down switching regulator with programmable output current limit. The current limit accurately controls the system power dissipation and reduces the size of the power path components.

The wide operating input voltage range of 7.5V to 36V (60V transient) suits the LT3663 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, and automotive power.

The LT3663 includes a low current shutdown mode, input overvoltage and undervoltage lockout, and thermal shutdown. Internal compensation and boost diode minimize the number of external exponents. 3.3V and 5V fixed output voltage versions are available.

The LT3663 is available in 8-lead DFN and MSOP packages with exposed pads for low thermal resistance.

Packaging

DFN-8

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
LT3663EDCB#PBF	DFN	8	E	$3.57		View
LT3663EDCB#TRMPBF	DFN	8	E	$3.57	$2.55	View
LT3663EDCB#TRPBF	DFN	8	E	$3.57	$2.50	View
LT3663EMS8E#PBF	MSOP	8	E	$3.71	$2.60	View
LT3663EMS8E#TRPBF	MSOP	8	E		$2.66	View
LT3663EMS8E-3.3#PBF	MSOP	8	E	$3.71	$2.60	View
LT3663EMS8E-3.3#TRPBF	MSOP	8	E		$2.66	View
LT3663EMS8E-5#PBF	MSOP	8	E	$3.71	$2.60	View
LT3663EMS8E-5#TRPBF	MSOP	8	E		$2.66	View
LT3663HMS8E#PBF	MSOP	8	H	$4.73	$3.31	View
LT3663HMS8E#TRPBF	MSOP	8	H		$3.37	View
LT3663HMS8E-3.3#PBF	MSOP	8	H	$4.73	$3.31	View
LT3663HMS8E-3.3#TRPBF	MSOP	8	H		$3.37	View
LT3663HMS8E-5#PBF	MSOP	8	H	$4.73	$3.31	View
LT3663HMS8E-5#TRPBF	MSOP	8	H		$3.37	View
LT3663IDCB#PBF	DFN	8	I	$4.20		View
LT3663IDCB#TRMPBF	DFN	8	I	$4.20	$2.99	View
LT3663IDCB#TRPBF	DFN	8	I	$4.20	$2.94	View
LT3663IMS8E#PBF	MSOP	8	I	$4.37	$3.06	View
LT3663IMS8E#TRPBF	MSOP	8	I		$3.12	View
LT3663IMS8E-3.3#PBF	MSOP	8	I	$4.37	$3.06	View
LT3663IMS8E-3.3#TRPBF	MSOP	8	I		$3.12	View
LT3663IMS8E-5#PBF	MSOP	8	I	$4.37	$3.06	View
LT3663IMS8E-5#TRPBF	MSOP	8	I		$3.12	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

• Distributed Supply Regulation
• Automotive Battery Regulation
• Industrial Supplies
• Wall Transformer Regulation

Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.