LTC3112MPFE#PBF - 15V, 2.5A Sync Buck-Boost | Analog Devices
MPN： LTC3112MPFE#PBF ✓ 啟用中LTC3112MPFE#PBF 概覽
A buck-boost converter is a type of DC-DC converter that can produce an output voltage either higher or lower than the input voltage. It is essential in battery-powered systems where the battery voltage can drop below or rise above the required rail. The LTC3112 uses a unique 4-switch, single inductor architecture that provides low noise and seamless transitions between buck, boost, and buck-boost modes, ensuring a stable output regardless of input variations.
Key features include a switching frequency of 750kHz, which allows for small external components, and a high efficiency synchronous design that eliminates the need for an external Schottky diode. The device also includes a built-in soft-start, overcurrent protection, and thermal shutdown. The exposed pad on the TSSOP package aids in thermal dissipation, making it suitable for high-current applications.
The LTC3112MPFE#PBF is designed for a wide range of applications, including 3.3V or 5V rails from 1, 2, or 3 Li-Ion cells, backup capacitor stacks, handheld inventory terminals, RF transmitters, 12V synchronous boost converters, multiple power input systems, LED lighting with current regulation, and 12V lead-acid battery to 12V conversion. Its wide input range and high output current make it a versatile choice for portable and industrial equipment.
When designing with this converter, pay attention to the inductor selection and PCB layout to minimize noise and ensure stability. The exposed pad should be soldered to a large copper area for effective heat sinking. The LTC3112MPFE#PBF is RoHS compliant and lead-free, making it suitable for environmentally conscious designs.
直接替換替代品，適用於 LTC3112MPFE#PBF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LTC3112MPFE#PBF （相同外形與佔位） — 差異在於 Operating Temperature Range, Function, Switching Frequency.
LTC3112HFE#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC3112EFE#PBF
✅ 直接替換聯絡詢價
查看資料表 →LTC3112MPFE#TRPBF
✅ 直接替換聯絡詢價
查看資料表 →LTC3112MPFE#PBF 最大額定值與電氣特性
| 功能 | Buck-Boost |
| 輸出類型 | Adjustable |
| 輸出電壓範圍 | 2.5V to 14V |
| Output Current | 2.5A |
| 輸入電壓範圍 | 2.7V to 15V |
| 切換頻率 | 750kHz |
| 輸出數量 | 1 |
| 同步整流器 | Yes |
| 封裝 | 20-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| 工作溫度範圍 | -55°C to +150°C (TJ) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
| Number of Terminals | 20 |
| Package Code | HTSSOP |
LTC3112MPFE#PBF 腳位配置
| 腳位 1 | SW1 — Switch node connection to inductor |
| 腳位 2 | PVIN — Power input supply |
| 腳位 3 | PVIN — Power input supply |
| 腳位 4 | GND — Ground |
| 腳位 5 | GND — Ground |
| 腳位 6 | SW2 — Switch node connection to inductor |
| 腳位 7 | SW2 — Switch node connection to inductor |
| 腳位 8 | PVOUT — Power output |
| 腳位 9 | PVOUT — Power output |
| 腳位 10 | VOUT — Output voltage sense |
| 腳位 11 | VOUT — Output voltage sense |
| 腳位 12 | VFB — Feedback input |
| 腳位 13 | RUN — Enable input |
| 腳位 14 | SYNC — External clock sync |
| 腳位 15 | MODE — Mode selection |
| 腳位 16 | SS — Soft-start programming |
| 腳位 17 | ITH — Error amplifier output |
| 腳位 18 | VIN — Input supply |
| 腳位 19 | VIN — Input supply |
| 腳位 20 | GND — Ground |
典型應用
LTC3112MPFE#PBF 適用於 6 應用s: Battery-Powered Handheld Devices, RF Transmitters, LED Lighting with Current Regulation, 12V Lead-Acid Battery to 12V Conversion, Backup Capacitor Stack, Multiple Power Input Systems.
Battery-Powered Handheld Devices
The LTC3112MPFE#PBF is ideal for handheld devices powered by 1-3 Li-Ion cells, providing a regulated 3.3V or 5V rail. Its wide input range (2.7V to 15V) ensures stable operation as the battery voltage drops, and the 2.5A output can power processors, displays, and wireless modules. The high switching frequency allows small external components, saving board space in compact designs.
推薦
RF Transmitters
RF transmitters require clean, stable power rails to avoid noise coupling into the signal. The LTC3112MPFE#PBF's low-noise 4-switch architecture and 750kHz switching frequency minimize interference. It can deliver 2.5A to support high-power amplifiers, and its wide input range allows operation from various battery configurations. The exposed pad aids thermal management during continuous transmission.
推薦
LED Lighting with Current Regulation
The LTC3112MPFE#PBF can be configured as a constant-current source for LED lighting, maintaining a stable current as the input voltage varies. Its buck-boost capability ensures the LED string voltage can be above or below the input, and the 2.5A output can drive multiple high-power LEDs. The high switching frequency reduces inductor size, enabling slim lighting fixtures.
推薦
12V Lead-Acid Battery to 12V Conversion
In automotive and industrial systems, a 12V lead-acid battery can vary from 9V to 15V. The LTC3112MPFE#PBF regulates this to a stable 12V output, ensuring consistent performance for sensitive electronics. Its 2.5A output can power sensors, controllers, and communication modules. The wide temperature range (-55°C to +150°C) suits under-hood and outdoor installations.
推薦
Backup Capacitor Stack
For systems requiring ride-through during power interruptions, the LTC3112MPFE#PBF can boost a capacitor stack voltage to a regulated rail. Its buck-boost topology allows the capacitor voltage to discharge below the output while maintaining regulation. The 2.5A output supports critical loads like data loggers and alarm systems, and the low quiescent current extends backup duration.
推薦
Multiple Power Input Systems
Systems that can be powered from USB, battery, or an external adapter benefit from the LTC3112MPFE#PBF's wide input range. It seamlessly handles input voltages from 2.7V to 15V, providing a stable output regardless of the source. This simplifies power path management and reduces component count, making it ideal for portable instruments and IoT gateways.
推薦
推薦產品摘要
工程參考資料，適用於 LTC3112MPFE#PBF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LTC3112HFE#PBF | LTC3112EFE#PBF | TPS63070RNMT |
|---|---|---|---|---|
| Package | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | VQFN-15 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Range | 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 12V |
| Output Current | 2.5A | 2.5A | 2.5A | 2A |
| Switching Frequency | 750kHz | 750kHz | 750kHz | 2.4MHz |
| Operating Temperature Range | -55°C to +150°C | -40°C to +150°C | -40°C to +125°C | -40°C to +125°C |
| Pin Compatibility | Reference | Yes | Yes | No |
主要差異化特點
- Military temperature range (對比LTC3112EFE#PBF)
- Higher output current (對比TPS63070RNMT)
- Pin-compatible with other LTC3112 variants (對比TPS63070RNMT)
設計說明
For optimal performance, place the input and output capacitors as close as possible to the PVIN and PVOUT pins. Use a 10µF ceramic capacitor for input and output. The inductor should be placed near the SW pins to minimize parasitic inductance. The exposed pad must be soldered to a large copper area for thermal dissipation.
The LTC3112MPFE#PBF can dissipate significant power at high output currents. With a typical efficiency of 90%, at 2.5A output and 5V, power loss is about 1.4W. The thermal resistance of the TSSOP-20 package is approximately 40°C/W, so the junction temperature rise is about 56°C. Ensure adequate copper area or airflow to keep the junction below 150°C.
Do not exceed the absolute maximum input voltage of 16V. Ensure the inductor saturation current is higher than the peak switch current. The RUN pin must be pulled high to enable the device; floating it may cause unpredictable behavior. Use a proper soft-start capacitor to limit inrush current during startup.
合規資訊
RoHS compliant and lead-free per JLCPCB listing. Not AEC-Q100 qualified.
