LTC3112MPFE#TRPBF - 15V, 2.5A Sync Buck-Boost | Analog Devices
MPN: LTC3112MPFE#TRPBF ✓ Hoạt độngLTC3112MPFE#TRPBF Tóm tắt
A buck-boost converter is a type of DC-DC switching regulator that can step up or step down an input voltage to produce a regulated output, regardless of whether the input is higher, lower, or equal to the output. This capability is essential in battery-powered devices where the battery voltage naturally declines over discharge, or in systems that must operate from a variety of power sources. The LTC3112 belongs to the family of synchronous switching regulators, which use internal MOSFETs for both high-side and low-side switches to achieve high efficiency and eliminate the need for an external Schottky diode.
Key features of the LTC3112 include a unique 4-switch, single inductor architecture that provides low noise and seamless transitions between buck and boost modes. It supports selectable PWM or Burst Mode operation, an easily synchronized oscillator, and output disconnect in shutdown. The device also includes an output current monitor, <1μA shutdown current, short-circuit protection, soft-start, current limit, and thermal shutdown. With an input range of 2.7V to 15V and output up to 14V, it can generate 3.3V or 5V from one, two, or three Li-Ion cells, or boost a 12V lead-acid battery to a regulated 12V rail.
Technically, the LTC3112 uses a current-mode control architecture with a fixed switching frequency that can be synchronized to an external clock. The 4-switch topology allows the inductor to be connected across the input or output depending on the mode, minimizing voltage stress and improving efficiency across a wide operating range. The output current monitor provides a proportional voltage that can be used for load current measurement or as a feedback signal for current regulation, enabling applications such as LED current regulation.
Typical applications include handheld inventory terminals, RF transmitters, 12V synchronous boost converters, multiple power input systems, LED lighting with current regulation, and backup capacitor stacks. The wide input range and high output current make it suitable for industrial, automotive, and portable electronics where supply voltages vary.
When designing with the LTC3112, pay careful attention to the inductor selection and PCB layout to minimize parasitic inductance and ensure stable operation. The exposed pad must be soldered to a copper plane for adequate thermal dissipation, especially at high output currents. Additionally, the Burst Mode operation can be disabled for applications requiring constant frequency operation to avoid interference with sensitive analog circuits.
Bộ thay thế dễ dàng lắp đặt cho LTC3112MPFE#TRPBF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC3112MPFE#TRPBF (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Switching Frequency, Function, Package.
LTC3112MPFE#PBF
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| Chức năng | Buck-Boost Switching Regulator |
| Kiểu đầu ra | Adjustable |
| Khoảng điện áp đầu ra | 2.5V to 14V |
| Điện áp tối đa đầu ra | 2.5A |
| Phạm vi điện áp đầu vào | 2.7V to 15V |
| Cân bằng đồng bộ | Yes |
| Số lượng đầu ra | 1 |
| Hộp | 20-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Khoảng nhiệt độ hoạt động | -55°C to 150°C (MP grade) |
| Điện áp tắt | <1μA |
| Tính năng | Current Limit, Enable, Soft Start, Thermal Shutdown |
| Trạng thái RoHS | Compliant |
| REACH Status | Compliant |
Cấu hình chân LTC3112MPFE#TRPBF
| Chân 1 | SW1 — Switch node connection for inductor |
| Chân 2 | PVIN — Power input supply |
| Chân 3 | PVIN — Power input supply |
| Chân 4 | SHDN — Shutdown control (active low) |
| Chân 5 | SYNC — External clock synchronization input |
| Chân 6 | MODE — PWM/Burst mode selection |
| Chân 7 | ITH — Error amplifier output for compensation |
| Chân 8 | FB — Feedback voltage input |
| Chân 9 | VOUT — Output voltage sense |
| Chân 10 | VOUT — Output voltage sense |
| Chân 11 | SW2 — Switch node connection for inductor |
| Chân 12 | PGND — Power ground |
| Chân 13 | PGND — Power ground |
| Chân 14 | IMON — Output current monitor |
| Chân 15 | VIN — Input supply for control circuitry |
| Chân 16 | VIN — Input supply for control circuitry |
| Chân 17 | SGND — Signal ground |
| Chân 18 | SS — Soft-start programming |
| Chân 19 | RT — Switching frequency programming |
| Chân 20 | VCC — Internal regulated supply (bypass) |
| Chân 21 | Exposed Pad — Thermal pad, connect to ground |
Ứng dụng tiêu biểu
LTC3112MPFE#TRPBF phù hợp cho 6 Áp dụngs: Handheld Inventory Terminals, RF Transmitters, 12V Synchronous Boost Converter, Multiple Power Input Systems, LED Lighting with Current Regulation, Backup Capacitor Stack.
Handheld Inventory Terminals
The LTC3112MPFE#TRPBF is ideal for handheld inventory terminals that require a regulated 3.3V or 5V rail from a battery that discharges over time. Its buck-boost topology maintains a stable output even when the battery voltage drops below the desired rail, ensuring reliable operation of the terminal's processor, display, and wireless modules. The high 2.5A output current can power multiple subsystems, while the low shutdown current (<1μA) extends battery life during standby. The device's small TSSOP-20EP package fits space-constrained handheld designs, and its selectable Burst Mode operation helps optimize efficiency at light loads, which is common in intermittent scanning applications.
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RF Transmitters
RF transmitters often require clean, stable power rails to avoid noise coupling into the RF signal. The LTC3112MPFE#TRPBF's low-noise 4-switch architecture and selectable PWM mode provide a clean output that minimizes interference. Its wide input range (2.7V to 15V) allows operation from various battery configurations, while the 2.5A output can supply high-current bursts during transmission. The output current monitor can be used to implement power management or battery monitoring. The device's synchronization capability allows the switching frequency to be aligned with other system clocks to avoid beat frequencies that could degrade RF performance.
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12V Synchronous Boost Converter
The LTC3112MPFE#TRPBF can be configured as a 12V synchronous boost converter, stepping up from lower input voltages such as 5V or a multi-cell battery. Its synchronous rectification achieves high efficiency, reducing heat generation and extending battery life. The device's 2.5A output current is sufficient for many 12V loads, such as motors, relays, or LED strips. The integrated soft-start prevents inrush current during startup, and the output disconnect feature ensures the load is fully isolated in shutdown. This makes the LTC3112 an excellent choice for portable equipment that needs a regulated 12V rail from a lower-voltage source.
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Multiple Power Input Systems
Systems that can be powered from multiple sources, such as USB, AC adapter, or battery, benefit from the LTC3112MPFE#TRPBF's wide input range and buck-boost capability. It can seamlessly regulate the output regardless of which source is active, even if the input voltage fluctuates. The device's 4-switch architecture ensures smooth transitions between buck and boost modes, preventing output glitches. The output current monitor can be used to detect the load and implement power-path management. This makes the LTC3112 ideal for portable devices, industrial equipment, and IoT gateways that need to operate from diverse power sources.
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LED Lighting with Current Regulation
The LTC3112MPFE#TRPBF's output current monitor enables precise LED current regulation, making it suitable for LED lighting applications that require constant brightness. Its buck-boost topology allows it to drive LEDs from a wide range of input voltages, such as 12V lead-acid batteries or multi-cell Li-Ion packs, maintaining consistent current as the battery discharges. The device's high efficiency reduces power loss and heat, which is critical in enclosed lighting fixtures. The PWM or Burst Mode operation can be used for dimming, and the synchronization feature allows multiple converters to operate at the same frequency to avoid beat frequencies in lighting systems.
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Backup Capacitor Stack
In systems that require ride-through during brief power interruptions, the LTC3112MPFE#TRPBF can regulate the voltage from a stack of backup capacitors. As the capacitors discharge, their voltage drops, but the buck-boost converter maintains a constant output until the capacitors are nearly depleted. This extends the effective backup time and ensures that critical loads, such as data loggers or alarm systems, continue to operate. The device's low shutdown current and high efficiency are beneficial for maximizing backup duration. The output current monitor can be used to estimate the remaining backup time based on load current.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC3112MPFE#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 | LTC3112MPFE#PBF | LTC3112EFE#PBF | LTC3112MPDHD#TRPBF | TPS63070RNMT |
|---|---|---|---|---|---|
| Package | 20-TSSOP EP | 20-TSSOP EP | 20-TSSOP EP | DFN-16 | VQFN-15 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Range | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2V to 16V |
| Output Voltage Range | 2.5V to 14V | 2.5V to 14V | 2.5V to 14V | 2.5V to 14V | 1.2V to 5.5V |
| Maximum Output Current | 2.5A | 2.5A | 2.5A | 2.5A | 2A |
| Operating Temperature Range | -55°C to 150°C | -55°C to 150°C | -40°C to 125°C | -55°C to 150°C | -40°C to 125°C |
| Synchronous Rectification | Yes | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- High-temperature MP grade operation (vsLTC3112EFE#PBF)
- Tape and reel packaging for automated assembly (vsLTC3112MPFE#PBF)
- Higher output current than TPS63070 (vsTPS63070RNMT)
Ghi chú thiết kế
For optimal performance, place the input and output capacitors as close to the IC pins as possible. Use low-ESR ceramic capacitors (e.g., 10μF X5R) for both input and output. The exposed pad must be soldered to a large copper area on the PCB to ensure adequate thermal dissipation, especially at high output currents. Refer to the LTC3112 datasheet layout guidelines for recommended component placement and trace routing.
The LTC3112MPFE#TRPBF can dissipate significant power at high output currents. For example, at 12V input, 5V output, and 2.5A load, the power loss is approximately 2.5W (assuming 85% efficiency). The TSSOP-20EP package has a thermal resistance of about 40°C/W (theta_JA) with proper PCB copper. Ensure the junction temperature stays below 150°C by providing adequate copper area and, if necessary, a heatsink or forced airflow.
Do not operate the LTC3112 without an inductor connected between SW1 and SW2, as this can cause damage. Ensure the inductor saturation current rating exceeds the peak switch current (typically 3A for 2.5A output). Also, avoid using the device in Burst Mode for noise-sensitive applications; select PWM mode instead. The SYNC pin should be tied to ground or a clock source as per the datasheet to avoid erratic operation.
Thông tin tuân thủ
RoHS and REACH compliance based on distributor listings. AEC-Q100 not applicable as this is not an automotive-grade part.
