LTC3115-2IDE#PBF - 40V, 2A Sync Buck-Boost DC/DC | Analog Devices
料号： LTC3115-2IDE#PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $8.52 | $8.52 |
| 10 | $7.68 | $76.80 |
| 100 | $6.84 | $684.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.76 | $5,760.00 |
LTC3115-2IDE#PBF 概述
A buck-boost converter is a type of DC-DC converter that can step up or step down an input voltage to produce a regulated output voltage, regardless of whether the input is higher, lower, or equal to the output. This makes it ideal for battery-powered systems where the battery voltage varies above and below the required rail. The LTC3115-2 belongs to the family of switching regulators, which are power management ICs that use inductive energy storage to achieve high efficiency, often exceeding 90%.
Key features of the LTC3115-2 include a proprietary low noise switching algorithm that optimizes efficiency across all operating modes and ensures seamless transitions between buck, boost, and buck-boost operation. It offers a programmable switching frequency from 300kHz to 2MHz, allowing designers to trade off efficiency against component size. The device also includes a precision 0.8V reference, soft-start, and a power good output for system monitoring.
Technically, the LTC3115-2 uses a four-switch synchronous architecture with internal N-channel MOSFETs, achieving peak efficiencies up to 95%. Its low noise algorithm reduces output voltage ripple and electromagnetic interference, making it suitable for noise-sensitive applications. The wide input voltage range accommodates automotive load dumps and industrial 24V rails, while the 2A output current supports moderate power loads.
Typical applications include automotive power supplies for infotainment and ADAS, industrial sensors and actuators, portable instruments, and battery-powered equipment where input voltage varies widely. The device's fast transient response (1ms) makes it particularly suited for systems with sudden load steps or input voltage dips.
When designing with the LTC3115-2, ensure proper PCB layout with short, low-inductance paths for the switching nodes and adequate input/output capacitance to handle ripple currents. The exposed pad must be soldered to a thermal relief for heat dissipation. Refer to the datasheet for component selection guidelines to optimize efficiency and transient response.
直接替换替代料： LTC3115-2IDE#PBF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LTC3115IFE-2#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3115EFE-2#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3115EFE-1#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC3115IFE-1#PBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC3115-2IDE#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 | 2.7V to 18V |
| 输入电压范围 | 2.7V to 40V |
| 最大输出电流 | 2A |
| 开关频率 | 300kHz to 2MHz |
| 同步整流器 | Yes |
| 输出数量 | 1 |
| 封装 | 20-TSSOP Exposed Pad |
| 工作温度范围 | -40C to +125C |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead Free | Yes |
| 基准电压 | 0.8V |
| 软启动 | Yes |
| 电源正常输出 | Yes |
LTC3115-2IDE#PBF 引脚配置
| 引脚 1 | SW1 — Switch node connection for the buck-boost inductor |
| 引脚 2 | PVIN1 — Power input supply for the buck stage |
| 引脚 3 | PVIN2 — Power input supply for the boost stage |
| 引脚 4 | VIN — Input supply for internal control circuitry |
| 引脚 5 | RUN — Enable pin (active high) |
| 引脚 6 | SS — Soft-start programming pin |
| 引脚 7 | FREQ — Switching frequency programming pin |
| 引脚 8 | MODE — Mode selection pin (burst or PWM) |
| 引脚 9 | VFB — Feedback voltage sense pin |
| 引脚 10 | ITH — Error amplifier output for loop compensation |
| 引脚 11 | PGOOD — Power good output (open-drain) |
| 引脚 12 | GND — Ground |
| 引脚 13 | SW2 — Switch node connection for the boost stage |
| 引脚 14 | PVOUT — Power output supply |
| 引脚 15 | VOUT — Output voltage sense |
| 引脚 16 | VCC — Internal supply output (bypass with capacitor) |
| 引脚 17 | GND — Ground |
| 引脚 18 | GND — Ground |
| 引脚 19 | GND — Ground |
| 引脚 20 | GND — Ground (exposed pad) |
典型应用
LTC3115-2IDE#PBF 适用于 6 应用s: Automotive Power Supplies, Industrial Sensors and Actuators, Portable Battery-Powered Devices, RF and Communication Systems, Test and Measurement Equipment, Medical Devices.
Automotive Power Supplies
The LTC3115-2IDE#PBF is ideal for automotive power supplies due to its wide 2.7V to 40V input range, which handles load dumps and cold-crank conditions. Its fast transient response (1ms) ensures stable output during sudden load steps in infotainment, ADAS, and telematics systems. The synchronous buck-boost topology maintains regulation when the battery voltage drops below the output, providing a clean 5V or 3.3V rail for microcontrollers and sensors. With 2A output capability, it can power multiple loads, and the low noise algorithm minimizes EMI in sensitive automotive electronics.
推荐
Industrial Sensors and Actuators
In industrial environments, the LTC3115-2IDE#PBF provides a regulated output from unregulated 24V or 12V rails, which can vary widely. Its 2A output current supports sensors, actuators, and communication interfaces. The wide input range (2.7V to 40V) accommodates voltage sags and surges, while the programmable switching frequency (300kHz to 2MHz) allows optimization for efficiency or size. The low noise operation is critical for precision analog sensors, and the power good output enables system monitoring. The device's robust design operates over -40C to +125C, suitable for harsh industrial conditions.
推荐
Portable Battery-Powered Devices
The LTC3115-2IDE#PBF is well-suited for portable devices powered by batteries that discharge from 4.2V down to 2.7V. The buck-boost topology maintains a constant output voltage (e.g., 3.3V) regardless of battery state, maximizing usable battery capacity. Its high efficiency (up to 95%) extends battery life, and the low quiescent current in sleep modes helps meet standby requirements. The small 20-TSSOP package and programmable frequency allow compact designs. The device's fast transient response handles sudden load changes from wireless transmitters or motors.
推荐
RF and Communication Systems
The LTC3115-2IDE#PBF's low noise switching algorithm reduces output ripple and EMI, making it suitable for powering RF transceivers, PLLs, and other noise-sensitive components. The wide input range allows operation from various supply rails, and the 2A output can power high-current RF amplifiers. The programmable frequency enables placement of switching harmonics away from RF bands. The fast transient response ensures stable voltage during burst transmissions. The device's synchronous architecture provides high efficiency, reducing heat in compact enclosures.
推荐
Test and Measurement Equipment
In test and measurement equipment, the LTC3115-2IDE#PBF provides a clean, regulated supply for precision analog circuits. Its low noise output and high PSRR ensure minimal interference with sensitive measurements. The wide input range accepts various bench supply voltages, and the 2A output can power multiple test circuits. The programmable frequency allows synchronization with measurement clocks to avoid interference. The device's fast transient response maintains accuracy during dynamic load changes, and the power good output aids in system diagnostics.
推荐
Medical Devices
The LTC3115-2IDE#PBF is suitable for battery-powered medical devices such as portable monitors and infusion pumps, where reliable power is critical. Its wide input range accommodates battery voltage variations, and the high efficiency extends battery life. The low noise operation is essential for sensitive analog front-ends. The device's robust design meets medical temperature requirements, and the power good output enables fail-safe monitoring. The 2A output can power motors, displays, and wireless communication modules.
推荐
推荐产品汇总
工程参考数据： LTC3115-2IDE#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 | LTC3115IFE-2#PBF | LTC3115EFE-2#PBF | LTC3115EFE-1#PBF | LTC3115IFE-1#PBF |
|---|---|---|---|---|---|
| Package | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V |
| Output Voltage Range | 2.7V to 18V | 2.7V to 18V | 2.7V to 18V | 2.7V to 18V | 2.7V to 18V |
| Maximum Output Current | 2A | 2A | 2A | 2A | 2A |
| Switching Frequency | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz |
| Operating Temperature Range | -40C to +125C | -40C to +125C | 0C to +70C | 0C to +70C | -40C to +125C |
| Transient Optimization | Fast (1ms) | Fast (1ms) | Fast (1ms) | Standard | Standard |
关键差异点
- Optimized for fast input transients (1ms) （对比 LTC3115EFE-1#PBF)
- Industrial temperature grade （对比 LTC3115EFE-2#PBF)
- Low noise switching algorithm （对比 LTC3115IFE-1#PBF)
设计说明
For optimal performance, place the input and output capacitors as close as possible to the PVIN and PVOUT pins. Use low-ESR ceramic capacitors (e.g., 10uF X5R) for input and output. The switching nodes (SW1, SW2) should have minimal copper area to reduce EMI, but ensure adequate trace width for current. The exposed pad (GND) must be soldered to a large copper pour for thermal dissipation.
The LTC3115-2IDE#PBF can dissipate significant power at high input-output differentials and 2A load. For example, at VIN=12V, VOUT=5V, and 2A, power loss is approximately 2W (assuming 90% efficiency). The 20-TSSOP package has a thermal resistance of about 40C/W (theta_JA) with proper PCB copper. Ensure adequate copper area and airflow to keep junction temperature below 125C.
Do not exceed the absolute maximum input voltage of 40V. The RUN pin must be pulled high to enable the device; floating it may cause unpredictable operation. The SS pin should have a capacitor to set soft-start time; omitting it can cause inrush current. The FREQ pin must be connected to a resistor to set the switching frequency; leaving it open may result in unstable operation. Always refer to the datasheet for proper component selection.
合规信息
RoHS compliant per Analog Devices product page. Lead-free (PBF suffix). AEC-Q100 qualification not specified for this variant; check datasheet for automotive grade options.
