LTC3370EUH#PBF - 4-Ch 8A Configurable Buck DC/DC | Analog Devices
MPN： LTC3370EUH#PBF ✓ 啟用中LTC3370EUH#PBF 概覽
A multioutput buck converter is a type of DC-DC switching regulator that provides multiple regulated output voltages from a single input supply. It belongs to the broader category of power management ICs (PMICs), which manage power distribution and conversion in electronic systems. The LTC3370 is a synchronous buck converter, meaning it uses both high-side and low-side switches to achieve high efficiency, especially at lower output voltages. This architecture reduces power loss compared to asynchronous converters, making it ideal for battery-powered and energy-sensitive applications.
Key features of the LTC3370EUH#PBF include four independent buck converters with a total output current of 8A (eight 1A stages), adjustable output voltages from 0.8V to 5.5V, and a wide input voltage range of 2.25V to 5.5V. The device supports eight distinct power configurations, allowing designers to allocate the 1A stages flexibly among the four outputs. The switching frequency is programmable from 1MHz to 3MHz via an external resistor, enabling trade-offs between efficiency and component size. Additionally, the LTC3370 includes internal compensation, soft-start, and overcurrent protection, simplifying design and enhancing reliability.
From a technical perspective, the LTC3370 uses a current-mode control architecture with synchronous rectification, achieving efficiencies up to 95%. The eight 1A power stages can be paralleled to provide higher current on a single output, such as 4A on one output while the others are disabled. The C1-C3 pins allow configuration of the power stage assignment, providing flexibility for various load requirements. The device also features a power-good output and an enable pin for each channel, enabling sequenced power-up and fault monitoring. The 32-lead WFQFN package with exposed pad ensures excellent thermal performance, with a thermal resistance of approximately 28°C/W.
Typical applications for the LTC3370EUH#PBF include portable and battery-powered devices, FPGA and DSP power supplies, solid-state drives, and industrial equipment. Its ability to provide multiple regulated rails from a single input makes it ideal for systems requiring core, I/O, and auxiliary voltages. The high efficiency and low quiescent current extend battery life in handheld devices, while the programmable frequency allows optimization for EMI-sensitive applications.
When designing with the LTC3370, it is important to select appropriate external inductors and capacitors based on the switching frequency and output current. The exposed pad should be soldered to a large copper area for effective heat dissipation. Additionally, the C1-C3 pins must be configured correctly to achieve the desired power stage allocation, and the RT pin resistor sets the switching frequency. Proper layout with short, low-inductance paths for the switching nodes is critical to minimize noise and ensure stable operation.
直接替換替代品，適用於 LTC3370EUH#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： LTC3370EUH#PBF （相同外形與佔位） — 差異在於 Package, Maximum Output Current, Operating Temperature Range, Output Voltage Range, Switching Frequency.
LTC3370HUH#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC3370IUH#PBF
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →LTC3370EUH#TRPBF
✅ 直接替換聯絡詢價
查看資料表 →LTC3370EUH
✅ 直接替換📋 參考替代品（不在目錄中）
LTC3370HUH#TRPBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LTC3370IUH#TRPBF
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →LTC3370EUH#PBF 最大額定值與電氣特性
| 輸出類型 | Adjustable |
| 輸出電壓範圍 | 0.8V to 5.5V |
| 最大輸出電流 | 8A (total, eight 1A stages) |
| 輸入電壓範圍 | 2.25V to 5.5V |
| 輸出數量 | 4 |
| 切換頻率 | 1MHz to 3MHz (programmable) |
| 同步整流 | Yes |
| 效率 | Up to 95% |
| 封裝 | 32-WFQFN Exposed Pad (EUH) |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40°C to +125°C |
| RoHS 狀態 | Compliant |
| Control Architecture | Current Mode |
LTC3370EUH#PBF 腳位配置
| 腳位 1 | SW1 — Switch node for buck converter 1 |
| 腳位 2 | VIN1 — Input supply for buck converter 1 |
| 腳位 3 | VIN2 — Input supply for buck converter 2 |
| 腳位 4 | SW2 — Switch node for buck converter 2 |
| 腳位 5 | GND — Ground |
| 腳位 6 | SW3 — Switch node for buck converter 3 |
| 腳位 7 | VIN3 — Input supply for buck converter 3 |
| 腳位 8 | VIN4 — Input supply for buck converter 4 |
| 腳位 9 | SW4 — Switch node for buck converter 4 |
| 腳位 10 | GND — Ground |
| 腳位 11 | C1 — Configuration pin 1 |
| 腳位 12 | C2 — Configuration pin 2 |
| 腳位 13 | C3 — Configuration pin 3 |
| 腳位 14 | RT — Switching frequency programming pin |
| 腳位 15 | EN1 — Enable for buck converter 1 |
| 腳位 16 | EN2 — Enable for buck converter 2 |
| 腳位 17 | EN3 — Enable for buck converter 3 |
| 腳位 18 | EN4 — Enable for buck converter 4 |
| 腳位 19 | PG — Power good output |
| 腳位 20 | VOUT1 — Output voltage sense for buck converter 1 |
| 腳位 21 | VOUT2 — Output voltage sense for buck converter 2 |
| 腳位 22 | VOUT3 — Output voltage sense for buck converter 3 |
| 腳位 23 | VOUT4 — Output voltage sense for buck converter 4 |
| 腳位 24 | GND — Ground |
| 腳位 25 | EXPOSED PAD — Exposed pad for thermal dissipation, connect to GND |
典型應用
LTC3370EUH#PBF 適用於 6 應用s: Portable and Battery-Powered Devices, FPGA and DSP Power Supplies, Solid-State Drives (SSDs), Industrial Equipment, Networking and Communication Equipment, Automotive Electronics (Non-AEC-Q100).
Portable and Battery-Powered Devices
The LTC3370EUH#PBF is ideal for portable devices like smartphones, tablets, and wearables, where multiple regulated rails are needed from a single battery. Its wide input range (2.25V to 5.5V) accommodates Li-Ion batteries, and the high efficiency (up to 95%) extends battery life. The configurable power stages allow designers to allocate current to different subsystems, such as processor core, memory, and I/O, optimizing power delivery. The low quiescent current in light-load modes further enhances battery endurance.
推薦
FPGA and DSP Power Supplies
FPGAs and DSPs require multiple voltage rails (e.g., core, I/O, auxiliary) with precise regulation and sequencing. The LTC3370EUH#PBF provides up to four independent outputs, each configurable to deliver the required current. The enable pins allow controlled power-up sequencing, preventing latch-up or excessive inrush current. The programmable switching frequency (1MHz to 3MHz) enables optimization for efficiency or component size, and the high efficiency reduces thermal stress in dense designs. This makes the LTC3370 a robust solution for high-performance computing platforms.
推薦
Solid-State Drives (SSDs)
SSDs require multiple power rails for the controller, NAND flash, and DRAM, with tight voltage tolerances and high efficiency to manage thermal dissipation. The LTC3370EUH#PBF's four buck converters can supply these rails from a single 3.3V or 5V input. The configurable power stages allow designers to allocate current based on the specific SSD architecture, and the high efficiency reduces heat generation, improving reliability. The small 32-WFQFN package saves board space, which is critical in compact SSD form factors.
推薦
Industrial Equipment
In industrial applications, the LTC3370EUH#PBF provides reliable multi-rail power from a 5V or 3.3V supply. Its wide operating temperature range (-40°C to +125°C) ensures performance in harsh environments. The programmable frequency allows designers to avoid EMI-sensitive frequency bands, and the current-mode control provides excellent line and load regulation. The device's robustness, including overcurrent protection and thermal shutdown, makes it suitable for factory automation, test equipment, and process control systems.
推薦
Networking and Communication Equipment
Networking equipment such as routers, switches, and base stations require multiple low-voltage rails for processors, ASICs, and transceivers. The LTC3370EUH#PBF can generate these rails from a 5V backplane supply with high efficiency, reducing power consumption and heat. The configurable power stages allow flexible current allocation, and the enable pins enable sequenced startup to avoid inrush current. The programmable switching frequency helps minimize EMI, which is critical in communication systems. This makes the LTC3370 an excellent choice for powering high-speed digital logic.
推薦
Automotive Electronics (Non-AEC-Q100)
While not AEC-Q100 qualified, the LTC3370EUH#PBF can be used in non-safety automotive applications such as infotainment systems, telematics, and body control modules. Its wide input range (2.25V to 5.5V) is compatible with automotive battery voltages (e.g., 3.3V, 5V rails). The high efficiency reduces heat in enclosed spaces, and the industrial temperature range (-40°C to +125°C) covers most automotive environments. The configurable outputs allow powering multiple loads, such as microcontrollers, sensors, and displays, from a single IC.
推薦
推薦產品摘要
工程參考資料，適用於 LTC3370EUH#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 | LTC3370HUH#PBF | LTC3370IUH#PBF | LTC3370EUH#TRPBF |
|---|---|---|---|---|
| Package | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current (Total) | 8A | 8A | 8A | 8A |
| Input Voltage Range | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V |
| Output Voltage Range | 0.8V to 5.5V | 0.8V to 5.5V | 0.8V to 5.5V | 0.8V to 5.5V |
| Switching Frequency | 1MHz to 3MHz | 1MHz to 3MHz | 1MHz to 3MHz | 1MHz to 3MHz |
| Operating Temperature Range | -40°C to +125°C | -40°C to +150°C | -40°C to +125°C | -40°C to +125°C |
| Packaging | Tube | Tube | Tube | Tape & Reel |
主要差異化特點
- Configurable power stages (對比LTC3370HUH#PBF)
- Industrial temperature range (對比LTC3370HUH#PBF)
- Pb-free (RoHS compliant) (對比LTC3370EUH)
設計說明
For optimal performance, place the LTC3370EUH#PBF close to the load and use short, wide traces for the switch nodes (SW1-SW4) to minimize parasitic inductance and resistance. The exposed pad must be soldered to a large copper area connected to ground to ensure proper heat dissipation. Use multiple vias to connect the exposed pad to the ground plane. Input and output capacitors should be placed as close as possible to the respective VIN and VOUT pins to reduce voltage spikes and improve transient response.
The LTC3370EUH#PBF can dissipate significant power when delivering high output currents. The 32-WFQFN package has a thermal resistance of approximately 28°C/W (theta_JA) with proper PCB layout. For example, at 8A total output with a 1V drop, power dissipation is 8W, causing a temperature rise of 224°C, which exceeds the maximum junction temperature. Therefore, ensure adequate copper area and airflow, or reduce the input-to-output voltage differential to keep the junction temperature within limits. Consider using a heatsink or forced cooling for high-power applications.
A common mistake is incorrect configuration of the C1-C3 pins, which determines the power stage allocation. Refer to the datasheet truth table to set these pins correctly for the desired output currents. Also, ensure the RT pin resistor is chosen to set the switching frequency within the specified range (1MHz to 3MHz). Do not leave the enable pins floating; tie them to VIN or use a controlled logic signal. Finally, verify that the input voltage does not exceed the absolute maximum rating of 5.5V, as this can damage the device.
合規資訊
RoHS compliant per PBF suffix. Not AEC-Q100 qualified. REACH and conflict minerals status not specified in provided data.
