LTC3256
LTC3256
RECOMMENDED FOR NEW DESIGNSWide VIN Range Dual Output 350mA Step-Down Charge Pump with Watchdog Timer
- Part Models
- 8
- 1ku List Price
- Starting From $4.48
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Overview
- 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
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
Documentation
Data Sheet 1
User Guide 1
Product Selector Card 1
Brochure 1
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 |
|---|---|---|---|
| LTC3256EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3256EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3256HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3256HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3256IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3256IMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3256MPMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3256MPMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3256EMSE#PBF | PRODUCTION | |
| LTC3256EMSE#TRPBF | PRODUCTION | |
| LTC3256HMSE#PBF | PRODUCTION | |
| LTC3256HMSE#TRPBF | PRODUCTION | |
| LTC3256IMSE#PBF | PRODUCTION | |
| LTC3256IMSE#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 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 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 | |
| LTC3256IMSE#PBF | PRODUCTION | |
| LTC3256IMSE#TRPBF | PRODUCTION | |
| LTC3256MPMSE#PBF | PRODUCTION | |
| LTC3256MPMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LTC4380 | RECOMMENDED FOR NEW DESIGNS | Low Quiescent Current Surge Stopper |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3245 | RECOMMENDED FOR NEW DESIGNS | Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump |
| LTC3255 | RECOMMENDED FOR NEW DESIGNS | Wide VIN Range Fault Protected 50mA Step-Down Charge Pump |
| LTC3260 | RECOMMENDED FOR NEW DESIGNS | Low Noise Dual Supply Inverting Charge Pump |
Evaluation Kits
LTC3256 Demo Board | Dual Output Step-Down Charge Pump Plus LDO, 5.5V ≤ VIN ≤ 38V, VOUT1 = 5V @ 100mA, VOUT2 = 3.3V @ 250mA