Features and Benefits
- 2.7V – 38V Operating Range (42V Abs Max)
- IQ = 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%
- IOUT Up to 500mA
- VOUT: 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.
- Automotive ECU/CAN Transceiver Supplies
- Industrial/Telecom Housekeeping Supplies
- Low Power 12V to 5V Conversion
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
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.
Tools & Simulations
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.
Models for the following parts are available in LTspice:
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.