LTC3115-1IDE#TRPBF - 40V, 2A Buck-Boost Converter | Analog Devices
MPN: LTC3115-1IDE#TRPBF ✓ Hoạt độngLTC3115-1IDE#TRPBF Tóm tắt
A buck-boost converter is a type of DC-DC switching regulator that can produce an output voltage either higher or lower than the input voltage. It is essential in systems where the input supply can vary above and below the desired output, such as automotive power rails during cranking or battery-powered devices as the cell voltage declines. The LTC3115-1 belongs to the family of switching regulators, which are more efficient than linear regulators for large voltage differences, though they introduce switching noise that must be filtered.
Key features include pin-selectable Burst Mode operation that reduces standby current and improves light-load efficiency, a 3µA shutdown current, output disconnect in shutdown, short-circuit protection, and internal soft-start. The wide 2.7V to 40V input and output range, combined with the 2A/1A current capability, makes it suitable for a broad range of power management tasks. The device is available in a 16-lead DFN package with exposed pad for thermal management.
The LTC3115-1 uses a proprietary control architecture that allows seamless transition between buck and boost modes without output disruption. The four internal switches are sized to minimize conduction and switching losses, achieving efficiencies up to 95% in typical applications. The device also features a programmable output current limit, allowing designers to tailor the current limit to the specific application.
Typical applications include automotive power supplies for infotainment and ADAS, industrial control systems, portable instruments, and battery-powered equipment where input voltage varies widely. The wide input range and high efficiency make it ideal for 12V and 24V industrial buses, as well as multi-cell Li-ion battery packs.
When designing with the LTC3115-1, careful attention must be paid to the inductor selection and PCB layout to minimize parasitic inductance and ensure stable operation. The exposed pad should be soldered to a large copper area for adequate heat dissipation, especially at high output currents.
Bộ thay thế dễ dàng lắp đặt cho LTC3115-1IDE#TRPBF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
LTC3115IDHD-1#TRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3115EDHD-1#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3115-2
⚡ Đồng gói ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LTC3115-1IDE#TRPBF Tỷ lệ tối đa & tính chất điện
| Chức năng | Buck-Boost |
| Kiểu đầu ra | Adjustable |
| Khoảng điện áp đầu ra | 2.7V to 40V |
| Phạm vi điện áp đầu vào | 2.7V to 40V |
| Điện áp tối đa đầu ra | 2A (Buck), 1A (Boost) |
| Điện áp yên tĩnh | 3µA (shutdown) |
| Hiệu suất | Up to 95% |
| Hộp | 16-WFDFN Exposed Pad |
| Khoảng nhiệt độ hoạt động | -40°C to 125°C (junction) |
| Kiểu lắp đặt | Surface Mount |
| Số lượng đầu ra | 1 |
| Cân bằng đồng bộ | Yes |
| Trạng thái RoHS | Compliant |
Cấu hình chân LTC3115-1IDE#TRPBF
| Chân 1 | VIN — Input supply voltage |
| Chân 2 | SW1 — Switch node 1 (buck switch) |
| Chân 3 | SW2 — Switch node 2 (boost switch) |
| Chân 4 | VOUT — Output voltage |
| Chân 5 | GND — Ground |
| Chân 6 | RUN — Enable pin (active high) |
| Chân 7 | MODE — Burst Mode selection |
| Chân 8 | ITH — Error amplifier output for compensation |
| Chân 9 | FB — Feedback input |
| Chân 10 | SS — Soft-start programming |
| Chân 11 | ILIM — Current limit programming |
| Chân 12 | PGND — Power ground |
| Chân 13 | VCC — Internal supply |
| Chân 14 | BST1 — Bootstrap for high-side switch |
| Chân 15 | BST2 — Bootstrap for high-side switch |
| Chân 16 | EP — Exposed pad (thermal) |
Ứng dụng tiêu biểu
LTC3115-1IDE#TRPBF phù hợp cho 6 Áp dụngs: 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 (-40°C to 125°C) ensures reliable operation in harsh environments. The output disconnect feature prevents back-feeding during shutdown, which is critical for automotive battery management.
Được đề xuất
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.
Được đề xuất
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 3µA 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC3115-1IDE#TRPBF — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
| Quiescent Current (Shutdown) | 3µA | 3µA | 3µA | 3µA | 3µA | 3µA | 1µA |
| Operating Temperature Range | -40°C to 125°C (junction) | -40°C to 125°C (junction) | 0°C to 85°C (junction) | -40°C to 125°C (junction) | 0°C to 85°C (junction) | -40°C to 125°C (junction) | -40°C to 125°C (junction) |
Bảo phân biệt quan trọng
- Wide 40V input and output range (vsTPS63070RNMT)
- Pin-selectable Burst Mode for light-load efficiency (vsLTC3115-2)
- Industrial temperature grade (-40°C to 125°C) (vsLTC3115EDHD-1#PBF)
Ghi chú thiết kế
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., 10µF 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 125°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.
Thông tin tuân thủ
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.
