LTC3246

RECOMMENDED FOR NEW DESIGNS

Wide V_INRange Buck-Boost Charge Pump with Watchdog Timer

Part Models: 8
1ku List Price: Starting From $3.89

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Overview

2.7V – 38V Operating Range (42V Abs Max)
I_Q = 20μA Operating, 1.5μA in Shutdown
Multi-Mode Buck-Boost Charge Pump (2:1, 1:1, 1:2) with Automatic Mode Switching
12V to 5V Efficiency = 81%
I_OUT Up to 500mA
V_OUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V)
Ultralow EMI Emissions
Engineered for Diagnostic Coverage in ISO 26262 Systems
Overtemperature, Overvoltage and Short Circuit Protection
Operating Junction Temperature: 150°C Max
POR/Watchdog Controller w/External Timing Control
Thermally Enhanced 16-Pin MSOP Package

The LTC3246 is a switched capacitor buck-boost DC/DC converter with integrated watchdog timer. The device produces a regulated output (3.3V, 5V or adjustable) from a 2.7V to 38V input. Switched capacitor fractional conversion is used to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversion ratio to optimize efficiency as input voltage and load conditions vary. No inductors are required.

The LTC3246’s reset time and watchdog timeout may be set without external components, or adjusted using external capacitors. A windowed watchdog function is used for high reliability applications. The reset input can be used for additional supply monitoring or be configured as a pushbutton reset.

Low operating current (20μA without load, 1.5μA in shutdown) and low external parts count make the LTC3246 ideally suited for low power, space constrained automotive/ industrial applications. The device is short-circuit and overtemperature protected and is available in a thermally enhanced 16-pin MSOP package.

Applications

Automotive ECU/CAN Transceiver Supplies
Industrial/Telecom Housekeeping Supplies
Low Power 12V to 5V Conversion

Part Models: 8
1ku List Price: Starting From $3.89

Documentation

Data Sheet 1

LTC3246: Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer Data Sheet 05/23/2017

User Guide 1

DC2466A - Demo Manual 08/04/2017

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3246EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246HMSE#PBf	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246MPMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3246MPMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LTC3246EMSE#PBF	PRODUCTION
LTC3246EMSE#TRPBF	PRODUCTION
LTC3246HMSE#PBf	PRODUCTION
LTC3246HMSE#TRPBF	PRODUCTION
LTC3246IMSE#PBF	PRODUCTION
LTC3246IMSE#TRPBF	PRODUCTION
LTC3246MPMSE#PBF	PRODUCTION
LTC3246MPMSE#TRPBF	PRODUCTION
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LTC3246EMSE#PBF	PRODUCTION
LTC3246EMSE#TRPBF	PRODUCTION
LTC3246HMSE#PBf	PRODUCTION
LTC3246HMSE#TRPBF	PRODUCTION
LTC3246IMSE#PBF	PRODUCTION
LTC3246IMSE#TRPBF	PRODUCTION
LTC3246MPMSE#PBF	PRODUCTION
LTC3246MPMSE#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3246MPMSE#PBF	PRODUCTION
LTC3246MPMSE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 2
LTC4380	RECOMMENDED FOR NEW DESIGNS	Low Quiescent Current Surge Stopper
LTC4231	RECOMMENDED FOR NEW DESIGNS	Micropower Hot Swap Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3246

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC3246 Demo Board | Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer

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Product Details

Demonstration circuit 2466A is a buck-boost 500mA charge pump with pin selectable output voltages and includes a watchdog timer featuring the LTC3246EMSE. The LTC3246 operates with a wide input voltage range from 2.7V to 38V and is engineered for diagnostic coverage for ISO 262262 compliant systems. The wide VIN operating range will allow the LTC3246 to provide up to 500mA sufficiently during an automotive cold crank.