LTC3112MPFE#PBF - 15V, 2.5A Sync Buck-Boost | Analog Devices
料号： LTC3112MPFE#PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.5 | $5,500.00 |
LTC3112MPFE#PBF 概述
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.
直接替换替代料： LTC3112MPFE#PBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LTC3112MPFE#PBF （相同外形与封装尺寸） ——差异在于 Operating Temperature Range, Function, Switching Frequency.
快速对比工具——选择替代料号进行并排对比：
LTC3112HFE#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3112EFE#PBF
✅ 直接替换✓ 有现货
$4.3 / 个
查看数据手册 →LTC3112MPFE#TRPBF
✅ 直接替换✓ 有现货
$5.06 / 个
查看数据手册 →LTC3112MPFE#PBF 最大额定值与电气特性
| 功能 | Buck-Boost |
| 输出类型 | Adjustable |
| 输出电压范围 | 2.5V to 14V |
| Output Current | 2.5A |
| 输入电压范围 | 2.7V to 15V |
| 开关频率 | 750kHz |
| 输出数量 | 1 |
| 同步整流器 | Yes |
| 封装 | 20-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| 工作温度范围 | -55°C to +150°C (TJ) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
| Number of Terminals | 20 |
| Package Code | HTSSOP |
LTC3112MPFE#PBF 引脚配置
| 引脚 1 | SW1 — Switch node connection to inductor |
| 引脚 2 | PVIN — Power input supply |
| 引脚 3 | PVIN — Power input supply |
| 引脚 4 | GND — Ground |
| 引脚 5 | GND — Ground |
| 引脚 6 | SW2 — Switch node connection to inductor |
| 引脚 7 | SW2 — Switch node connection to inductor |
| 引脚 8 | PVOUT — Power output |
| 引脚 9 | PVOUT — Power output |
| 引脚 10 | VOUT — Output voltage sense |
| 引脚 11 | VOUT — Output voltage sense |
| 引脚 12 | VFB — Feedback input |
| 引脚 13 | RUN — Enable input |
| 引脚 14 | SYNC — External clock sync |
| 引脚 15 | MODE — Mode selection |
| 引脚 16 | SS — Soft-start programming |
| 引脚 17 | ITH — Error amplifier output |
| 引脚 18 | VIN — Input supply |
| 引脚 19 | VIN — Input supply |
| 引脚 20 | GND — Ground |
典型应用
LTC3112MPFE#PBF 适用于 6 应用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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： LTC3112MPFE#PBF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Military temperature range （对比 LTC3112EFE#PBF)
- Higher output current （对比 TPS63070RNMT)
- Pin-compatible with other LTC3112 variants （对比 TPS63070RNMT)
设计说明
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.
合规信息
RoHS compliant and lead-free per JLCPCB listing. Not AEC-Q100 qualified.
