LTC3112IDE#PBF - 15V, 2.5A Buck-Boost DC/DC | Analog Devices
部品番号: LTC3112IDE#PBF ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.16 | $4,160.00 |
LTC3112IDE#PBF 概要
A buck-boost converter is a type of DC-DC converter that can step up or step down an input voltage to a regulated output voltage, regardless of whether the input is higher or lower than the output. It is a key component in power management ICs, enabling efficient power conversion in portable electronics, industrial equipment, and automotive systems. The LTC3112 belongs to the family of switching regulators, which are preferred over linear regulators for their high efficiency, especially when the input-to-output voltage difference is large.
Key features of the LTC3112 include a programmable output voltage from 2.5V to 15V, a switching frequency that can be set from 300kHz to 2MHz via an external resistor, and a low quiescent current of 40uA in Burst Mode operation. The device also offers a power good indicator, soft-start, and current limit protection. Its high efficiency, up to 95%, minimizes power loss and heat generation, making it suitable for space-constrained designs.
The LTC3112 uses a current-mode control architecture with a 4-switch topology, which allows for seamless transitions between buck, boost, and buck-boost modes. This architecture ensures low output voltage ripple and fast transient response, critical for powering sensitive loads such as RF transmitters and microprocessors. The device also includes a precision 0.6V reference and an internal compensation network, simplifying the external component count.
Typical applications include generating 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. The wide input range and high output current make it a versatile choice for many power supply designs.
When designing with the LTC3112, it is important to select the inductor and capacitors according to the datasheet guidelines to ensure stability and optimal performance. The switching frequency should be chosen to balance efficiency and component size, and proper PCB layout with short, low-inductance paths is essential for minimizing noise and EMI.
ドロップイン代替品: LTC3112IDE#PBF — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
LTC3112IDD#PBF
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LTC3112EDE#PBF
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
LTC3112IDE#PBF 最大定格＆電気的特性
| 機能 | Buck-Boost |
| Output Current | 2.5 A |
| 入力電圧範囲 | 2.7 V to 15 V |
| 出力電圧範囲 | 2.5 V to 15 V |
| スイッチング周波数 | 300 kHz to 2 MHz |
| 静止電流 | 40 uA (Burst Mode) |
| 効率 | Up to 95% |
| パッケージ | 16-pin DFN (4mm x 5mm x 0.75mm) |
| 動作温度 | -40C to +125C |
| 実装タイプ | Surface Mount |
| 同期整流器 | Yes |
| Power Good Indicator | Yes |
| ソフトスタート | Yes |
| RoHS ステータス | Compliant |
| Lead Free | Yes |
LTC3112IDE#PBF ピン構成
| ピン 1 | SW1 — Switch node 1 |
| ピン 2 | PVIN — Power input |
| ピン 3 | VIN — Input supply |
| ピン 4 | RUN — Enable input |
| ピン 5 | SYNC/MODE — Synchronization and mode select |
| ピン 6 | PGOOD — Power good output |
| ピン 7 | VFB — Feedback input |
| ピン 8 | ITH — Error amplifier output |
| ピン 9 | SS — Soft-start |
| ピン 10 | GND — Ground |
| ピン 11 | SW2 — Switch node 2 |
| ピン 12 | PVOUT — Power output |
| ピン 13 | VOUT — Output voltage sense |
| ピン 14 | PGND — Power ground |
| ピン 15 | NC — No connect |
| ピン 16 | NC — No connect |
主な用途
LTC3112IDE#PBF の用途: 6 件s: Battery-Powered Portable Devices, RF Transmitter Power Supply, LED Lighting with Current Regulation, 12V Lead-Acid Battery to 12V Conversion, Multiple Power Input Systems, Backup Capacitor Stack.
Battery-Powered Portable Devices
The LTC3112IDE#PBF is ideal for generating regulated 3.3V or 5V rails from 1, 2, or 3 Li-Ion cells. Its wide input range (2.7V to 15V) accommodates the varying voltage of discharging batteries, while the buck-boost topology ensures a stable output even when the battery voltage drops below the output. The low 40uA quiescent current in Burst Mode extends battery life in standby, and the high efficiency (up to 95%) minimizes power loss during active operation. This makes it perfect for handheld terminals, portable instruments, and wireless sensors where battery life is critical.
おすすめ
RF Transmitter Power Supply
The LTC3112IDE#PBF provides a clean, low-noise power rail for RF transmitters, which require stable voltage to maintain signal integrity. Its 4-switch architecture and current-mode control deliver low output ripple and fast transient response, essential for handling the pulsed loads of RF power amplifiers. The wide input range allows operation from various battery configurations, and the high output current (2.5A) supports high-power transmitters. The power good indicator helps with system sequencing, ensuring the transmitter is enabled only when the supply is stable.
おすすめ
LED Lighting with Current Regulation
The LTC3112IDE#PBF can be configured for constant current LED driving, making it suitable for LED lighting applications. Its buck-boost topology ensures a constant current to the LED string even when the input voltage varies, such as from a battery or a 12V rail. The high output current (2.5A) can drive multiple high-power LEDs, and the adjustable switching frequency allows optimization for efficiency or component size. The device's high efficiency reduces heat generation, which is critical in enclosed lighting fixtures.
おすすめ
12V Lead-Acid Battery to 12V Conversion
The LTC3112IDE#PBF is well-suited for converting a 12V lead-acid battery voltage to a regulated 12V output. Lead-acid batteries can vary from 10.5V (discharged) to 14.4V (charging), and the buck-boost topology maintains a constant 12V output across this range. This is essential for automotive and industrial systems that require a stable 12V rail. The device's high efficiency and thermal performance ensure reliable operation in harsh environments, and the wide input range provides headroom for voltage transients.
おすすめ
Multiple Power Input Systems
The LTC3112IDE#PBF is ideal for systems that can be powered from multiple sources, such as USB, battery, or AC adapter. Its wide input range (2.7V to 15V) allows it to accept any of these sources, and the buck-boost topology ensures a regulated output regardless of which source is active. This simplifies the power management design, as a single converter can handle all input scenarios. The power good indicator and soft-start features facilitate smooth transitions between power sources.
おすすめ
Backup Capacitor Stack
The LTC3112IDE#PBF can efficiently convert the voltage from a backup capacitor stack to a regulated output, providing ride-through power during brief interruptions. Capacitor stacks have a wide voltage range as they discharge, and the buck-boost topology maintains a constant output until the capacitor is nearly depleted. This is useful in applications like industrial controllers and data loggers that require uninterrupted power. The low quiescent current and high efficiency maximize the usable energy from the capacitor.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LTC3112IDE#PBF — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LTC3112IFE#PBF | LTC3112MPFE#PBF | LTC3112IDD#PBF | LTC3112EDE#PBF | TPS63070RNMT |
|---|---|---|---|---|---|---|
| Package | 16-pin DFN | 20-pin TSSOP | 20-pin TSSOP | 16-pin DFN | 16-pin DFN | VQFN-15 |
| Brand | Analog Devices | 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 | 2.7V to 15V | 2V to 16V |
| Output Current | 2.5A | 2.5A | 2.5A | 2.5A | 2.5A | 2A |
| Switching Frequency | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 2.4MHz |
| Quiescent Current | 40uA | 40uA | 40uA | 40uA | 40uA | 50uA |
| Operating Temperature | -40C to +125C | -40C to +125C | -55C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Power Good Indicator | Yes | Yes | Yes | Yes | Yes | Yes |
主な差別化要因
- Wide input voltage range (2.7V to 15V) （vs TPS63070RNMT)
- Low quiescent current (40uA) （vs TPS63070RNMT)
- Programmable switching frequency (300kHz to 2MHz) （vs TPS63070RNMT)
設計ノート
For optimal performance, place the input and output capacitors as close as possible to the IC pins. Use low-ESR ceramic capacitors (e.g., 10uF) for input and output. The inductor should be placed near the SW pins to minimize parasitic inductance. Ensure a solid ground plane and use vias to connect the exposed pad to the ground plane for thermal relief.
The LTC3112IDE#PBF can dissipate significant power at high output currents. The 16-pin DFN package has an exposed pad that must be soldered to a copper area on the PCB to act as a heatsink. For example, at 2.5A output with 5V to 3.3V conversion, power dissipation is about 1.25W, requiring a copper area of at least 1 square inch to keep junction temperature below 125C.
Do not exceed the absolute maximum input voltage of 15V. Ensure the feedback resistor divider uses 1% tolerance resistors to maintain output voltage accuracy. The SYNC/MODE pin should be tied to a logic level or an external clock to avoid noise. Also, the soft-start capacitor should be chosen to limit inrush current, especially when powering large capacitive loads.
コンプライアンス情報
RoHS compliant and lead-free per Analog Devices. Not AEC-Q100 qualified.
