LTC3115-1IDE#TRPBF - 40V, 2A Buck-Boost Converter | Analog Devices
MPN: LTC3115-1IDE#TRPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $4.95 | $495.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.75 | $3,750.00 |
Drop-in alternatives for LTC3115-1IDE#TRPBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LTC3115IDHD-1#TRPBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115EDHD-1#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115-2
β‘ Same Packageπ Reference alternative (not in catalog)
LTC3115-1IDE#TRPBF Maximum Ratings & Electrical Characteristics
| Function | Buck-Boost |
| Output Type | Adjustable |
| Output Voltage Range | 2.7V to 40V |
| Input Voltage Range | 2.7V to 40V |
| Maximum Output Current | 2A (Buck), 1A (Boost) |
| Switching Frequency | [DATA_NEEDED: Switching Frequency] |
| Quiescent Current | 3Β΅A (shutdown) |
| Efficiency | Up to 95% |
| Package | 16-WFDFN Exposed Pad |
| Operating Temperature Range | -40Β°C to 125Β°C (junction) |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Synchronous Rectifier | Yes |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL Level] |
LTC3115-1IDE#TRPBF Pin Configuration
| Pin 1 | VIN β Input supply voltage |
| Pin 2 | SW1 β Switch node 1 (buck switch) |
| Pin 3 | SW2 β Switch node 2 (boost switch) |
| Pin 4 | VOUT β Output voltage |
| Pin 5 | GND β Ground |
| Pin 6 | RUN β Enable pin (active high) |
| Pin 7 | MODE β Burst Mode selection |
| Pin 8 | ITH β Error amplifier output for compensation |
| Pin 9 | FB β Feedback input |
| Pin 10 | SS β Soft-start programming |
| Pin 11 | ILIM β Current limit programming |
| Pin 12 | PGND β Power ground |
| Pin 13 | VCC β Internal supply |
| Pin 14 | BST1 β Bootstrap for high-side switch |
| Pin 15 | BST2 β Bootstrap for high-side switch |
| Pin 16 | EP β Exposed pad (thermal) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LTC3115-1IDE#TRPBF is suitable for 6 applications: Automotive Power Supplies, Industrial Control Systems, Battery-Powered Equipment, Portable Electronics, Telecom and Networking, Renewable Energy Systems.
Automotive Power Supplies
The LTC3115-1IDE#TRPBF is ideal for automotive power supplies due to its wide 2.7V to 40V input range, which accommodates cold-crank and load-dump conditions. It can provide a regulated 5V or 3.3V rail from a 12V battery that may drop to 6V during cranking or rise to 40V during load dump. The 2A output current supports infotainment systems, ADAS sensors, and ECU power. Its high efficiency (up to 95%) reduces heat dissipation in the engine bay, and the industrial temperature grade (-40Β°C to 125Β°C) ensures reliable operation in harsh environments. The output disconnect feature prevents back-feeding during shutdown, which is critical for automotive battery management.
Recommended
Industrial Control Systems
In industrial control systems, the LTC3115-1IDE#TRPBF provides a stable output from 24V or 48V buses that can vary widely. Its 2.7V to 40V input range covers standard industrial voltages, and the adjustable output allows generation of 5V, 12V, or other rails for microcontrollers, sensors, and actuators. The device's synchronous rectification and Burst Mode operation ensure high efficiency across load ranges, reducing thermal stress in sealed enclosures. The programmable output current limit allows designers to protect downstream circuitry. The wide temperature range and robust protection features (short-circuit, thermal shutdown) make it suitable for factory automation, process control, and robotics.
Recommended
Battery-Powered Equipment
The LTC3115-1IDE#TRPBF is well-suited for battery-powered equipment such as portable instruments, medical devices, and wireless sensors. Its 2.7V minimum input allows operation from a single Li-ion cell (3.0V to 4.2V) or two alkaline cells (2.7V to 3.2V). The buck-boost topology maintains a regulated output even as the battery voltage drops below the output level, maximizing usable battery capacity. The 3Β΅A shutdown current and Burst Mode operation extend battery life in standby and light-load conditions. The output disconnect feature isolates the load during shutdown, preventing battery drain. The small 16-lead DFN package saves board space in compact designs.
Recommended
Portable Electronics
For portable electronics like smartphones, tablets, and wearables, the LTC3115-1IDE#TRPBF provides a regulated core voltage from a battery that discharges over time. Its wide input range accommodates various battery chemistries and cell counts. The high efficiency (up to 95%) reduces heat generation, which is critical in compact devices. The device's small footprint and low external component count (only inductor, capacitors, and resistors) simplify PCB design. The programmable output current limit allows optimization for different load requirements. The industrial temperature grade ensures reliable operation in outdoor or extreme environments.
Recommended
Telecom and Networking
In telecom and networking equipment, the LTC3115-1IDE#TRPBF can generate stable rails from a 48V backplane or a battery backup system. Its 40V maximum input is compatible with 48V telecom buses (typically 36V to 72V, but with proper derating). The buck-boost topology allows operation from a partially discharged battery (e.g., 36V) to produce a regulated 12V or 5V rail. The device's high efficiency reduces power loss in densely packed racks. The output disconnect and short-circuit protection enhance system reliability. The wide temperature range supports outdoor and uncontrolled environments.
Recommended
Renewable Energy Systems
The LTC3115-1IDE#TRPBF is used in renewable energy systems such as solar-powered sensors and small wind turbines. Its wide input range (2.7V to 40V) allows it to handle varying output from solar panels (e.g., 5V to 30V) and battery voltages. The buck-boost topology ensures a stable output for charging batteries or powering loads, even when the panel voltage is lower than the battery voltage. The high efficiency maximizes energy harvest, and the low shutdown current preserves battery charge during periods of no sunlight. The device's robust protection features (short-circuit, thermal) ensure long-term reliability in outdoor installations.
Recommended
Recommended Products Summary
Engineering reference data for LTC3115-1IDE#TRPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3115IDHD-1#TRPBF | LTC3115EDHD-1#PBF | LTC3115IFE-1#TRPBF | LTC3115EFE-1#PBF | LTC3115-2 | TPS63070RNMT |
|---|---|---|---|---|---|---|---|
| Package | 16-WFDFN Exposed Pad | 16-WFDFN Exposed Pad | 16-WFDFN Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 16-WFDFN Exposed Pad | VQFN-15 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Range | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2V to 16V |
| Output Voltage Range | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.5V to 9V |
| Maximum Output Current | 2A (Buck), 1A (Boost) | 2A (Buck), 1A (Boost) | 2A (Buck), 1A (Boost) | 2A (Buck), 1A (Boost) | 2A (Buck), 1A (Boost) | 2A (Buck), 1A (Boost) | 2A (Buck), 2A (Boost) |
| Switching Frequency | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | 1MHz (fixed) | 2.4MHz |
| Quiescent Current (Shutdown) | 3Β΅A | 3Β΅A | 3Β΅A | 3Β΅A | 3Β΅A | 3Β΅A | 1Β΅A |
| Operating Temperature Range | -40Β°C to 125Β°C (junction) | -40Β°C to 125Β°C (junction) | 0Β°C to 85Β°C (junction) | -40Β°C to 125Β°C (junction) | 0Β°C to 85Β°C (junction) | -40Β°C to 125Β°C (junction) | -40Β°C to 125Β°C (junction) |
Key Differentiators
- Wide 40V input and output range (vs TPS63070RNMT)
- Pin-selectable Burst Mode for light-load efficiency (vs LTC3115-2)
- Industrial temperature grade (-40Β°C to 125Β°C) (vs LTC3115EDHD-1#PBF)
Design Notes
For optimal performance, place the input and output capacitors as close as possible to the VIN and VOUT pins. Use low-ESR ceramic capacitors (e.g., 10Β΅F X5R) for input and output. The inductor should be placed near the SW1 and SW2 pins to minimize parasitic inductance. Ensure a solid ground plane under the IC and connect the exposed pad to the ground plane with multiple vias for thermal and electrical performance.
The LTC3115-1IDE#TRPBF can dissipate significant power at high output currents and large input-output differentials. The exposed pad must be soldered to a large copper area (at least 1 square inch) to keep the junction temperature below 125Β°C. For example, at 2A output with 12V to 5V conversion, power dissipation is approximately 2W, requiring adequate thermal relief. Use thermal vias to transfer heat to other layers.
Do not exceed the absolute maximum ratings of 40V on VIN or VOUT. Ensure the inductor saturation current rating is higher than the peak switch current. The ILIM pin must be programmed correctly to avoid premature current limiting or overcurrent damage. Use a Schottky diode for the bootstrap supply if needed. Also, verify the compensation network on the ITH pin for stability across all load conditions.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; for automotive, consider the LTC3115IDHD-1#TRPBF which is also not qualified but has industrial temp range.
