LTC4414EMS8 - 36V Low Loss PowerPath PFET Controller | Analog Devices
MPN： LTC4414EMS8 ✓ 啟用中LTC4414EMS8 概覽
A PowerPath controller is a power management IC that governs the flow of current between multiple power sources (such as a battery and an AC adapter) and a load. Unlike a simple diode-OR arrangement, which wastes power as forward-voltage drop and heat, an ideal-diode controller senses the voltage across an external MOSFET and drives the gate so the device conducts like a diode with milliohm-level resistance. This places the LTC4414 in the ideal-diode ORing controller family within the broader voltage regulator and power management IC hierarchy.
Key features include the wide 3V to 36V operating range covering 12V, 24V, and automotive-style battery rails, forward voltage drop as low as 20 mV when conducting (per datasheet forward voltage characteristic), and a status (STAT) output that can drive an auxiliary P-channel switch to connect a secondary source such as an AC wall adapter. A CTL input enables control of the main MOSFET, and an internal current sink pulls CTL low when the pin is left floating, providing deterministic default behavior.
Architecturally, the LTC4414 monitors the source-drain voltage of the external PFET and amplifies the gate drive to regulate a small, fixed forward voltage, emulating an ideal diode. This near-zero drop ORing extends battery life, reduces self-heating, and eliminates the need for heatsinking that Schottky diode ORing would require at comparable currents. The 20 microseconds switchover delay parameter ensures rapid source transfer during power fail events.
Typical applications include high-current diode-ORing of wall adapters and batteries, low-loss power supply holdup and switchover circuits, automotive and industrial multi-source power distribution, and battery backup systems for servers and networking equipment.
When designing, select a P-channel MOSFET with adequate Vgs rating for the 36V maximum input and sufficient Rds(on) so that I-squared-R losses stay within thermal limits.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 LTC4414EMS8 — 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： LTC4414EMS8 （相同外形與佔位） — 差異在於 Control Input, Function, Package, RoHS Status, Status Output.
LTC4414IMS8
✅ 直接替換聯絡詢價
查看資料表 →LTC4414EMS8#PBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC4414EMS8#TRPBF
✅ 直接替換📋 參考替代品（不在目錄中）
LTC4414EMS8 最大額定值與電氣特性
| 功能 | OR Controller / Ideal Diode PowerPath Controller for large P-channel MOSFETs |
| Input Supply Voltage | 3 V to 36 V |
| Configuration | Source Selector Switch, P-Channel, 2:1 |
| Forward Voltage Drop | 20 mV (typical, conducting) |
| Gate Driver Output Current | 500 uA |
| Switchover Delay | 20 us |
| Temperature Grade E | 0C to 85C (guaranteed specifications) |
| Temperature Grade I | -40C to 125C (guaranteed and tested) |
| 封裝 | MSOP-8 |
| 安裝類型 | Surface Mount |
| Status Output | Open-drain STAT pin |
| Control Input | CTL pin with internal pull-down current sink |
| RoHS 狀態 | Compliant (#PBF lead-free variant) |
LTC4414EMS8 msop-8 腳位配置指南
LTC4414EMS8（msop-8 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： LTC4414EMS8.
請參閱 資料表 以查看完整腳位配置。
典型應用
LTC4414EMS8 適用於 6 應用s: Wall Adapter / Battery Power ORing, Battery Backup / UPS Holdup Circuits, Automotive and Industrial Multi-Source Distribution, Low-Loss Power Switchover for Portable Instruments, Hot-Standby Redundant Supply ORing, Solar and Energy Harvesting Source Selection.
Wall Adapter / Battery Power ORing
The LTC4414EMS8 is purpose-built for ORing an AC wall adapter with a battery. With its 3V to 36V input range it accepts both the adapter output and battery rails directly, while the 20 mV forward drop eliminates the roughly 400 mV loss of a Schottky diode-OR, extending battery runtime and reducing self-heating. The controller drives a large external P-channel MOSFET as a near-ideal diode, so switchover to the wall adapter occurs within approximately 20 us, keeping the load alive through the transition. The open-drain STAT pin can gate an auxiliary PFET that connects the adapter path, giving deterministic source priority with a single MSOP-8 IC and two small capacitors.
推薦
Battery Backup / UPS Holdup Circuits
In servers, network switches, and industrial controllers, the LTC4414EMS8 ORs a main supply with a backup battery or supercapacitor bank. Because the controller regulates only 20 mV across the conducting PFET, the backup source stays fully isolated at low quiescent cost and engages almost instantly (about 20 us switchover delay) when the main rail sags. Designers should size the P-channel MOSFET Rds(on) so backup-path conduction losses stay within thermal budget, and use the CTL pin, which has an internal pull-down current sink, to disable the backup path during test or fault conditions. The 36V maximum input also suits 24V industrial backup architectures.
推薦
Automotive and Industrial Multi-Source Distribution
Industrial 24V buses and 12V automotive rails fall comfortably inside the 36V maximum input of the LTC4414EMS8, making it a fit for prioritized power distribution where battery, adapter, and auxiliary sources must be diode-ORed. Using a PFET ideal diode instead of a Schottky removes heatsinking at multi-ampere loads: at 10 A with a 5-milliohm FET, conduction loss is only about 0.5 W versus roughly 5 W for a Schottky. For the full automotive ambient range, specify the LTC4414IMS8 I grade, guaranteed and tested from -40C to 125C per the Analog Devices datasheet, in the identical MSOP-8 footprint.
推薦
Low-Loss Power Switchover for Portable Instruments
Portable and battery-powered instruments benefit from the LTC4414EMS8 because the controller's low forward drop preserves battery voltage headroom and its low consumption keeps standby drain minimal. The CTL pin allows a microcontroller to force the PFET off, disconnecting a charging adapter path or isolating the battery, while the internal pull-down current sink guarantees a defined off-state if CTL is left unconnected. The near-ideal diode action also prevents reverse discharge into a dead battery or failed supply, a common failure mode of simple ORing topologies. The MSOP-8 footprint keeps the power-management area small on dense handheld PCBs.
推薦
Hot-Standby Redundant Supply ORing
High-availability equipment frequently ORs two independent power supplies so either can fail without dropping the load. The LTC4414EMS8 provides this with a 20 us switchover delay, fast enough that bulk output capacitance bridges the transfer without a brownout in most designs. Its 36V rating supports 24V redundant backplanes, and the STAT output gives the system monitor a logic signal indicating which source is conducting, enabling fault logging and alerts. Because the forward drop is only about 20 mV, load sharing between the two PFET controllers is predictable and thermal derating of the ORing stage is minimal even at continuous full current.
推薦
Solar and Energy Harvesting Source Selection
Energy harvesting and solar-powered systems must select between a harvested source and a primary battery without wasting harvested energy in a series diode. The LTC4414EMS8 regulates the PFET drop to approximately 20 mV, so most of the harvested voltage reaches the storage element or load. Its 3V minimum input accommodates single Li-ion and 3V-derived rails common in harvesting front ends, while the 36V ceiling covers open-circuit voltage of small 12V-class panels. The CTL pin enables a system controller to disconnect the harvested path during maximum-power-point tracking transients, and the STAT output reports source status to the power-management MCU.
推薦
推薦產品摘要
工程參考資料，適用於 LTC4414EMS8 — 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 | LTC4414IMS8 | LTC4414EMS8#PBF | LTC4414EMS8#TRPBF |
|---|---|---|---|---|
| Package | MSOP-8 | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same |
| Brand | Analog Devices (Linear Technology) | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V | 3 V to 36 V |
| Forward Voltage | 20 mV (conducting) | 20 mV | 20 mV | 20 mV |
| Gate Drive Output | 500 uA | 500 uA | 500 uA | 500 uA |
| Switchover Delay | 20 us | 20 us | 20 us | 20 us |
| Operating Temperature | 0C to 85C (E grade, guaranteed) | -40C to 125C (I grade, guaranteed and tested) | 0C to 85C (E grade) | 0C to 85C (E grade) |
主要差異化特點
- Extended temperature guarantee (對比LTC4414EMS8 (this part, E grade))
- 36V input ceiling covers 24V buses (對比LTC4412EMS8)
- Near-ideal 20 mV forward drop (對比Schottky diode ORing (e.g. 0.5 V drop))
設計說明
Select the external P-channel MOSFET for Rds(on) first: since the LTC4414 regulates only about 20 mV forward drop, conduction loss is approximately I^2 x Rds(on). Estimated: with a 5-milliohm PFET at 10 A, dissipation is about 0.5 W, versus roughly 5 W for a 0.5 V Schottky diode at the same current - an order-of-magnitude reduction that usually eliminates heatsinking. Also verify the MOSFET Vgs rating and ensure the gate-source clamp requirements for 36V input transients are met per the LTC4414 datasheet.
The CTL pin has an internal current sink pulling it to ground if left floating, which forces a defined off-state - do not rely on board leakage for bias. The STAT pin is open-drain, so it needs a pull-up resistor to a logic rail if used for source-status signaling. Remember the E grade (LTC4414EMS8) is guaranteed only from 0C to 85C; for extended ambients use the LTC4414IMS8 I grade, which is guaranteed and tested to -40C to 125C per the Analog Devices datasheet.
Place the controller close to the PFET with short, wide gate traces to minimize gate-loop inductance during the approximately 20 us switchover event. Sense the SENSE pins Kelvin-style directly at the MOSFET source and drain pads so the 20 mV regulation is not corrupted by trace drops - at 10 A, 2 milliohms of trace resistance alone adds 20 mV. Decouple VIN with a 0.1 uF ceramic capacitor adjacent to the pin, and keep high-current source-drain paths out of the sense routing.
合規資訊
The LTC4414EMS8#PBF variant is the lead-free, RoHS-compliant version offered by DigiKey; #PBF suffix denotes lead-free finish per Analog Devices convention. REACH and halogen-free status not stated in provided data.
