LTC3245

RECOMMENDED FOR NEW DESIGNS

Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump

Data Sheet (Rev. C) Product Selection Table
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Overview

  • 2.7V to 38V VIN Range
  • IQ = 18μA Operating; 4μA in Shutdown
  • 12V to 5V Efficiency = 81%
  • Multimode Operation (2:1, 1:1, 1:2) with Automatic Mode Switching
  • Low Noise, Constant Frequency Operation
  • Pin Selectable Burst Mode® Operation
  • VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V)
  • IOUT Up to 250mA
  • Overtemperature and Short-Circuit Protection
  • Operating Junction Temperature: 150°C Maximum
  • Thermally Enhanced 12-Pin MSOP and Low Profile 12-Pin (3mm × 4mm) DFN Packages
  • AEC-Q100 Qualified for Automotive Applications

The LTC3245 is a switched capacitor buck-boost DC/DC converter that produces a regulated output (3.3V, 5V or adjustable) from a 2.7V to 38V input. The device uses switched capacitor fractional conversion 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 unique constant frequency architecture provides a lower noise output than conventional charge pump regulators. To optimize efficiency at the expense of slightly higher output ripple, the device has pin selectable Burst Mode operation.

Low operating current (20μA with no load, 4μA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3245 ideally suited for low power, space constrained automotive/industrial applications. The device is short-circuit and overtemperature protected, and is available in thermally enhanced 12-pin MSOP and low profile 3mm × 4mm 12-pin DFN packages.

APPLICATIONS

  • Automotive ECU/CAN Transceiver Supplies
  • Industrial Housekeeping Supplies
  • Low Power 12V to 5V Conversion
LTC3245
Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump
LTC3245 Application Circuit LTC3245 Pin Configuration LTC3245 Pin Configuration LTC3245 Performance Graph
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3245
LTspice

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC1802A

LTC3245EMSE Demo Board | Buck-Boost Charge Pump, 2.7V ≤ VIN ≤ 38V, VOUT = 1.2V/3.3V/5V @ 250mA

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Product Details

Demonstration circuit DC1802A is a wide VIN range, low noise, 250mA buck-boost charge pump featuring the LTC3245EMSE. It has an input supply range of 2.7V to 38V and provides a jumper-selectable 5V, 3.3V, or adjustable output (set to 1.2V) at 250mA.
DC1802A
LTC3245EMSE Demo Board | Buck-Boost Charge Pump, 2.7V ≤ VIN ≤ 38V, VOUT = 1.2V/3.3V/5V @ 250mA
DC1802A Demo Board DC1802A Demo Board DC1802A Demo Board DC1802A Demo Board DC1802A Demo Board DC1802A - Schematic

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