LT3502 - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm x 2mm DFN and MS10

Features

• Click Here For LT3502 Evaluation Kit
• 3V to 40V Input Voltage Range
• 500mA Output Current
• Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502)
• 800mV Feedback Voltage
• Short-Circuit Robust
• Soft-Start
• Low Shutdown Current: <2μA
• Internally Compensated
• Internal Boost Diode
• Thermally Enhanced 2mm × 2mm 8-Lead DFN and 10-lead MS10 Package

Typical Application

Description

The LT3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500mA power switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio reception, making the LT3502A particularly suitable for automotive applications.

Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input current surge during start-up. DA current sense provides further protection in fault conditions. An internal boost diode reduces component count.

Packaging

DFN-8, 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
LT3502AEDC#PBF	DFN	8	E	$2.79		View
LT3502AEDC#TRMPBF	DFN	8	E	$2.79	$2.00	View
LT3502AEDC#TRPBF	DFN	8	E	$2.79	$1.95	View
LT3502AEMS#PBF	MSOP	10	E	$2.93	$2.05	View
LT3502AEMS#TRPBF	MSOP	10	E		$2.11	View
LT3502AIDC#PBF	DFN	8	I	$3.34		View
LT3502AIDC#TRMPBF	DFN	8	I	$3.34	$2.39	View
LT3502AIDC#TRPBF	DFN	8	I	$3.34	$2.34	View
LT3502AIMS#PBF	MSOP	10	I	$3.51	$2.46	View
LT3502AIMS#TRPBF	MSOP	10	I		$2.52	View
LT3502EDC#PBF	DFN	8	E	$2.79		View
LT3502EDC#TRMPBF	DFN	8	E	$2.79	$2.00	View
LT3502EDC#TRPBF	DFN	8	E	$2.79	$1.95	View
LT3502EMS	MSOP	10	E	$2.93	$2.05	View
LT3502EMS#PBF	MSOP	10	E	$2.93	$2.05	View
LT3502EMS#TR	MSOP	10	E		$2.11	View
LT3502EMS#TRPBF	MSOP	10	E		$2.11	View
LT3502IDC#PBF	DFN	8	I	$3.34		View
LT3502IDC#TRMPBF	DFN	8	I	$3.34	$2.39	View
LT3502IDC#TRPBF	DFN	8	I	$3.34	$2.34	View
LT3502IMS#PBF	MSOP	10	I	$3.51	$2.46	View
LT3502IMS#TRPBF	MSOP	10	I		$2.52	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
DC1221A	LT3502EDC Demo Board | 750kHz/2.2MHz, 500mA Step-Down Reg in DFN	$75.00
DC1221B	LT3502EDC Demo Board | 750kHz/2.2MHz,500mA Step-Down Regulator
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Applications

• Automotive Systems
• Battery-Powered Equipment
• Wall Transformer Regulation
• Distributed Supply Regulation

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 LT3502A or run  demonstration circuit of the LT3502.
  
  
• 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.