LTC4414EMS8#PBF - 36V Low Loss PowerPath PFET Controller | Analog Devices
料号： LTC4414EMS8PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.28 | $4.28 |
| 10 | $3.9 | $39.00 |
| 100 | $3.42 | $342.00 |
| 500 | $3.13 | $1,565.00 |
| 1,000 | $2.85 | $2,850.00 |
LTC4414EMS8PBF 概述
A PowerPath controller, also called an ideal diode controller or ORing controller, is a power management IC that drives an external MOSFET to emulate a diode with near-zero forward voltage drop. In the power-management hierarchy, it sits between raw power sources (wall adapters, batteries, redundant supplies) and the system load switch stage, replacing Schottky diodes that would otherwise waste 0.3V to 0.7V and dissipate significant heat.
Key features of the LTC4414 include its wide 3V to 36V operating supply range, which covers 5V, 12V, 24V, and 28V industrial and telecom rails; its low-loss near-ideal diode behavior that maximizes efficiency and extends battery life; and fast switchover (20us typ) that keeps the load powered during source transitions. The controller monitors the forward voltage across the external PFET and regulates the gate to minimize conduction loss, cutting off reverse current flow automatically.
Technically, the LTC4414 senses voltage differential between input and output through the external P-channel MOSFET body, amplifies the error, and drives the gate with its internal 500uA gate-drive output. This closed-loop regulation delivers milliohm-class effective forward drop when paired with a large low-RDS(ON) PFET, versus the hundreds of millivolts of a Schottky diode, dramatically reducing self-heating in high-current paths.
Typical applications include dual-battery power ORing for extended runtime, wall-adapter-to-battery switchover in portable and industrial equipment, redundant supply (N+1) ORing in telecom and server backplanes, and low-loss load switching on 24V and 36V industrial buses.
A key design consideration: the external PFET selection dominates performance - choose RDS(ON) and gate charge to match load current and switchover speed, and ensure the gate-source rating (typically +/-20V) is respected at 36V input.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： LTC4414EMS8PBF ——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：
LTC4414IMS8#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC4412EMS8#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC4412IMS8#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC4414EMS8PBF 规格参数
| 功能 | PowerPath / ideal diode ORing controller for external P-channel MOSFET |
| Input Supply Voltage Range | 3 V to 36 V |
| 拓扑 | High-side P-channel source selector, 2:1 |
| Gate Drive Output Current | 500 uA |
| Switchover Delay | 20 us |
| Number of Drivers | 1 (single channel) |
| 封装 | MSOP-8 |
| 安装类型 | Surface Mount |
| Operating Temperature Range (E grade) | 0C to 85C (guaranteed and tested) |
| Operating Temperature Range (I grade) | -40C to +125C (guaranteed and tested) |
| Grade of This Part (E) | 0C to 85C; -40C to 85C assured by design, characterization and statistical process control correlation |
| RoHS 状态 | Compliant (#PBF suffix = lead-free) |
| 1ku List Price | Starting from $2.85 (as of 2026-10-19) |
| Manufacturer Lifecycle | Recommended for new designs |
| Series | LTC4414 PowerPath |
| Reverse Current Blocking | Yes (near ideal diode function) |
LTC4414EMS8PBF msop-8 引脚配置指南
LTC4414EMS8PBF（msop-8 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： LTC4414EMS8PBF.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LTC4414EMS8PBF 适用于 6 应用s: Dual Battery Power ORing, Wall Adapter to Battery Switchover, Redundant Supply ORing in Telecom Backplanes, 24V Industrial Bus Load Switching, Solar and Energy Harvesting Source Selection, Server and Storage Supply Redundancy.
Dual Battery Power ORing
The LTC4414 excels at ORing two batteries because its near-ideal diode behavior with an external P-channel MOSFET wastes only I2*RDS(ON) instead of the 0.3V-0.7V forward drop of Schottky diodes. According to the Analog Devices datasheet, this permits highly efficient ORing of multiple power sources for extended battery life and low self-heating. In a typical dual-battery design, one LTC4414 drives a PFET per battery; the 20us switchover delay keeps the load rail held during source transitions, and the 3V-36V input range covers 12V and 24V battery stacks with margin. Reverse current blocking prevents a charged battery from back-feeding a depleted one, while milliohm-class effective forward drop maximizes usable capacity in portable and remote equipment.
推荐
Wall Adapter to Battery Switchover
In portable and industrial instruments, the LTC4414 provides seamless switchover between a wall adapter and a backup battery. When the adapter is present, the controller drives its PFET into a low-resistance conduction state; when the adapter is removed, the 20us switchover delay ensures the battery PFET takes the load before the rail collapses, preventing reset in microcontroller systems. The 3V-36V supply range handles 12V adapters and 24V industrial supplies, while 500uA of gate drive quickly enhances large low-RDS(ON) PFETs to cut conduction loss. Per the Analog Devices datasheet, low self-heating eliminates bulky heatsinking, and the near-ideal diode action prevents the battery from discharging into an unpowered adapter jack.
推荐
Redundant Supply ORing in Telecom Backplanes
Telecom -48V-adjacent and 24V/28V intermediate bus systems use N+1 redundant supplies ORed at the point of load. The LTC4414's 36V rating and 3V-36V operating range fit 24V and 28V bus architectures, and its near-ideal diode behavior minimizes the voltage budget consumed by the ORing element - critical because Schottky diodes at tens of amps dissipate tens of watts. The 20us switchover delay rides through supply fail events without dropping the load rail. According to the Analog Devices datasheet, the external large PFET approach means effective resistance is limited only by MOSFET choice, so a single footprint supports current upgrades by swapping the MOSFET, not the controller.
推荐
24V Industrial Bus Load Switching
Industrial I/O modules and sensor heads powered from 24V rails benefit from the LTC4414's low-loss load path. The controller's 36V maximum input leaves headroom above nominal 24V plus surge, and its milliohm-class effective on-resistance (with an appropriate PFET) keeps module self-heating negligible in sealed DIN-rail enclosures. Per the Analog Devices datasheet, the E grade is guaranteed from 0C to 85C and the I grade over -40C to +125C, letting designers match temperature qualification to the enclosure environment. Because the part only drives the PFET gate (500uA drive, 20us response), inrush behavior is set by the MOSFET and local capacitance, simplifying hot-swap coordination at the module input.
推荐
Solar and Energy Harvesting Source Selection
Off-grid systems selecting between a solar panel, a backup battery, and an auxiliary supply use the LTC4414 to OR sources with minimal energy loss. Every millivolt saved in the ORing element is energy delivered to the load or preserved in the battery, so the near-ideal diode action matters more here than anywhere: replacing a 0.4V Schottky drop at 2A saves roughly 0.8W continuously. The 3V-36V input range accepts common 12V and 24V panels. According to the Analog Devices datasheet, the 20us switchover delay and automatic reverse-current blocking handle irradiance transitions gracefully, and low controller self-heating suits passive, fanless outdoor enclosures.
推荐
Server and Storage Supply Redundancy
Data-center storage enclosures and server accessory rails OR redundant 12V feeds at the drive backplane using the LTC4414. The near-ideal diode function keeps the effective series resistance at milliohms, preserving voltage margin for hot-plug drive spin-up, and the 20us switchover delay plus reverse-current blocking isolate a failed supply without disturbing the healthy rail. The MSOP-8 footprint keeps the controller area small on dense backplane PCBs, and the external PFET topology allows current rating to scale from 5A to 20A+ by MOSFET selection alone. Per the Analog Devices datasheet, low self-heating in the ORing path reduces fan load and improves enclosure acoustic performance.
推荐
推荐产品汇总
工程参考数据： LTC4414EMS8PBF ——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 | LTC4414IMS8#PBF | LTC4412EMS8#PBF | LTC4412IMS8#PBF |
|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 3 V to 36 V | 3 V to 36 V | up to 28 V | up to 28 V |
| Operating Temperature | 0C to 85C (E grade) | -40C to +125C | 0C to 70C/85C | -40C to +125C |
| Function | Ideal diode PowerPath controller, external PFET | Identical - same die | Ideal diode controller, external PFET | Ideal diode controller, external PFET |
关键差异点
- 36V input rating with large-PFET gate drive （对比 LTC4412EMS8#PBF)
- Near-ideal diode loss versus Schottky ORing （对比 LTC4412EMS8#PBF)
- Trade-off: commercial temperature grade only on the EMS8 E variant （对比 LTC4414IMS8#PBF)
设计说明
Select the external P-channel MOSFET first: its gate-source voltage rating must exceed the maximum input voltage (up to 36V on the LTC4414), and many PFETs are limited to VGS +/-20V. If headroom is insufficient, add a zener-clamped gate protection network per the LTC4414 datasheet application circuits. Also verify RDS(ON) at the actual gate drive level - the controller provides only 500uA gate drive, so gate charge should be modest to preserve the 20us switchover performance under load steps.
Place the controller close to the PFET gate and source-sense nodes; the sense lines carry microamp-level currents and are susceptible to noise pickup. Keep the power loop (input, PFET drain/source, output) wide and short, with the bulk input and output capacitors within a few millimeters of the MOSFET. Follow the typical application layout in the LTC4414 datasheet: a solid ground plane under the MSOP-8, Kelvin-connected source sensing, and a small local decoupling capacitor on VDD.
Estimated: controller self-heating is minimal, but total path loss is I_load^2 * RDS(ON) of the external PFET. For example, at 5A with a 15 milliohm PFET, conduction loss is about 0.38W - versus roughly 2.5W to 3.5W for a Schottky diode ORing element at 0.5V-0.7V forward drop. Verify PFET junction temperature with its own theta_JA; the LTC4414 MSOP-8 package dissipates only the controller quiescent power, so no heatsinking of the IC itself is normally required.
The LTC4414E grade is guaranteed and tested from 0C to 85C; performance from -40C to 85C is assured only by design, characterization, and statistical process control correlation per the Analog Devices datasheet. For guaranteed extended-temperature operation, specify the LTC4414I grade (-40C to +125C guaranteed and tested). Do not substitute grades without reviewing your product's qualification requirements, as datasheet limits apply only to the guaranteed range.
合规信息
#PBF suffix denotes lead-free (Pb-free) finish per Analog Devices and DigiKey listings. REACH, halogen-free and conflict-minerals status should be confirmed via the ADI compliance portal.
