LTC3256
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3256

Wide VIN Range Dual Output 350mA Step-Down Charge Pump with Watchdog Timer

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $3.54
Features
  • Input Voltage Range: 5.5V to 38V
  • Independently Enabled 5V and 3.3V Fixed Outputs
  • 5V Output: 100mA Max
  • 3.3V LDO Output: 250mA Max
  • Multimode Step-Down Charge Pump (2:1, 1:1) with Automatic Mode Switching
  • Low Quiescent Current
    • 20μA with Both Outputs Regulating (No Load)
    • 0.5μA in Shutdown
  • Engineered for Diagnostic Coverage in ISO26262 Systems
  • 1.1V Reference Output for System Diagnostics
  • Power-On Reset and Watchdog Controller with Adjustable Timing
  • Overcurrent Fault Protection on Each Output
  • Overtemperature Protection
  • 150°C Max Operating Junction Temperature
  • Thermally Enhanced 16-Lead MSOP Package
Additional Details
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The LTC3256 is a wide input range switched capacitor step-down DC/DC converter that produces two regulated outputs: a 5V output via direct connection to the charge pump output, and a 3.3V output via a low dropout (LDO) linear post-regulator. The device provides up to 350mA of total output current. At 12V VIN and maximum load on both outputs, power dissipation is reduced by over 2W compared to a dual LDO regulator solution.

The LTC3256 maximizes efficiency by running the charge pump in 2:1 mode over as wide an operating range as pos- sible, and automatically switches to 1:1 mode as needed due to VIN and load conditions. Controlled input current and switching slew rates minimize conducted and radiated EMI. An integrated watchdog timer, independent power good outputs and reset input ensure reliable system operation and fault monitoring. A buffered 1.1V reference output enables system self-testing for safety critical applications.

The LTC3256 has numerous safety features including overcurrent fault protection, overtemperature protection and tolerance of 38V input transients. The LTC3256 is available in a thermally enhanced 16-lead MSOP plastic package with exposed pad (MSE16).

Applications

  • Automotive ECU/CAN Transceiver Supplies
  • Industrial/Telecom Housekeeping Supplies
  • Low Power 12V to 5V and 3.3V Conversion
Part Models 8
1ku List Price Starting From $3.54

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Jun 5, 2024

- 24_0003

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

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Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3256EMSE#PBF

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Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0003

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LTC3256EMSE#PBF

PRODUCTION

LTC3256EMSE#TRPBF

PRODUCTION

LTC3256HMSE#PBF

PRODUCTION

LTC3256HMSE#TRPBF

PRODUCTION

LTC3256IMSE#PBF

PRODUCTION

LTC3256IMSE#TRPBF

PRODUCTION

LTC3256MPMSE#PBF

PRODUCTION

LTC3256MPMSE#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0132

arrow down

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3256EMSE#PBF

PRODUCTION

LTC3256EMSE#TRPBF

PRODUCTION

LTC3256HMSE#PBF

PRODUCTION

LTC3256HMSE#TRPBF

PRODUCTION

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PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2375A

LTC3256 Demo Board | Dual Output Step-Down Charge Pump Plus LDO, 5.5V ≤ VIN ≤ 38V, VOUT1 = 5V @ 100mA, VOUT2 = 3.3V @ 250mA

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DC2375A

LTC3256 Demo Board | Dual Output Step-Down Charge Pump Plus LDO, 5.5V ≤ VIN ≤ 38V, VOUT1 = 5V @ 100mA, VOUT2 = 3.3V @ 250mA

LTC3256 Demo Board | Dual Output Step-Down Charge Pump Plus LDO, 5.5V ≤ VIN ≤ 38V, VOUT1 = 5V @ 100mA, VOUT2 = 3.3V @ 250mA

Product Detail

Demonstration Circuit 2375A is a dual output 350mA step down charge pump with a post-regulator LDO and watchdog timer featuring the LTC3256EMSE. The LTC3256 operates with a wide input voltage range from 5.5V to 38V and is engineered for diagnostic coverage in ISO262262 systems. The LTC3256 can provide up to 350mA of output current from a 12V battery with 2W less power dissipation than 2 ideal linear regulators. The DC2375A was populated with automotive grade components for evaluation.


Because of the wide input operating range it is possible to exceed the specified operating junction temperature and even reach thermal shutdown with heavy loads. Please refer to the data sheet for additional information on the thermal limitations of the device.

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