The LTC�3246 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.
Feature
- 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
Applications
- Automotive ECU/CAN Transceiver Supplies
- Industrial/Telecom Housekeeping Supplies
- Low Power 12V to 5V Conversion
