LTC4414IMS8 - 36V Low Loss PowerPath PFET Controller | Analog Devices
N.º de pieza: LTC4414IMS8 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.19 | $31,90 |
| 100 | $2.96 | $296,00 |
| 500 | $2.85 | $1.425,00 |
| 1.000 | $2.85 | $2.850,00 |
LTC4414IMS8 Descripción general
An ideal-diode ORing controller is a power management IC that regulates the gate of an external MOSFET so the device conducts current in only one direction, replacing lossy Schottky diodes in power-path designs. In the system hierarchy, it sits between raw power sources (batteries, wall adaptors, solar panels) and the load rail, forming the front end of power management IC architectures. The LTC4414 controls the external P-channel MOSFET forward voltage to approximately 20 mV, permitting highly efficient ORing of multiple power sources for extended battery life and low self-heating.
Key features include a wide 36V input rating suitable for industrial 24V bus systems, gate-drive control optimized for large P-channel FETs so high current paths have minimal voltage drop, an open-drain STAT output that signals the active source and can drive an auxiliary PFET for wall-adaptor takeover, and a CTL control pin with an internal current sink pulling it low when floating. The internal current sink behavior means a high-level input on CTL forces the STAT pin ON, connecting a second active source such as an AC wall adaptor to the load.
Technically, the controller monitors the voltage across the PFET source and drain and adjusts gate drive to servo the forward drop, achieving a near-ideal diode without the 0.3V-0.5V loss of Schottky ORing diodes. At a 5A load path this saves roughly 1.5W to 2.5W of dissipation compared with a Schottky, cutting self-heating and improving efficiency in battery-backed systems. The I-grade device is guaranteed and tested over -40C to +125C per the Analog Devices (Linear Technology) datasheet, while the E-grade variant is specified from 0C to 85C.
Typical applications include battery and wall-adaptor power switchover in industrial instrumentation, low-loss ORing of redundant supplies in telecom and networking equipment, and high-current diode-OR front ends for battery backup in automotive and factory systems where the 36V rating provides margin above 24V rails.
For design, choose a PFET with adequate VDS margin (at least 40V to 60V for 36V rails) and low RDS(on), and place the controller close to the FET to keep the sensitive sense lines short; gate slew rate is set by the controller, limiting inrush into large load capacitance.
This page synthesizes distributor pricing, drop-in alternative analysis, comparison tables, and practical design notes that are not consolidated in the manufacturer datasheet alone. Pricing is as of 2026-10-19 and references the ADI 1ku list price of $2.85.
Alternativas directas para LTC4414IMS8 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LTC4414IMS8 (mismo factor de forma y huella) — difiere en Control Input, Function, Package, RoHS Status, Status Output.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC4414IMS8#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC4414EMS8#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC4414HVIMS8#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LTC4414IMS8 Especificaciones
| Función | OR Controller / Source Selector, PowerPath Controller |
| Topología | P-Channel MOSFET Controller, 2:1 |
| Maximum Operating Voltage | 36 V |
| Operating Temperature Range (I Grade) | -40C to +125C |
| Operating Temperature Range (E Grade) | 0C to +85C |
| Encapsulado | 8-MSOP (MS8) |
| Tipo de montaje | Surface Mount |
| External PFET Control | Yes, drives large P-channel MOSFET gate |
| Status Output | Open-drain STAT pin, forced ON by high CTL input |
| Control Input | CTL with internal pull-down current sink |
| Forward Drop Regulation | Near-ideal diode via external PFET (20 mV class per datasheet typical application) |
| Estado RoHS | Compliant (Pb-free #PBF version offered) |
| Guaranteed Temperature Testing (I Grade) | Tested over -40C to +125C |
Guía de configuración de pines de LTC4414IMS8 8-msop (ms8)
Configuración de pines para LTC4414IMS8 (encapsulado 8-msop (ms8)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para LTC4414IMS8.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LTC4414IMS8 es adecuado para 6 aplicacións: Battery / Wall Adaptor Power Switchover, Low-Loss Diode ORing of Redundant Supplies, Industrial 24V Bus Backup Power, Automotive Auxiliary Power ORing, Solar / Multiple Source Energy Harvesting Front End, High-Current Server and Networking Backplane Power.
Battery / Wall Adaptor Power Switchover
The LTC4414IMS8 fits battery-to-adaptor switchover because its near-ideal diode action wastes only tens of millivolts across the external PFET instead of the 0.3V to 0.5V of a Schottky diode, extending battery runtime and cutting self-heating. Per the Analog Devices datasheet, a high CTL input forces the open-drain STAT pin ON, which can gate an auxiliary P-channel switch so an AC wall adaptor takes over the load seamlessly. Place the controller between the battery and load rail with the PFET sized for the full load current and 40V+ VDS. Because the controller IC carries only gate-drive current, the thermal budget is set by the MOSFET RDS(on), making multi-amp switchover practical from a small 8-MSOP controller.
Recomendado
Low-Loss Diode ORing of Redundant Supplies
In telecom and industrial equipment, two supply feeds are often ORed for redundancy. Using Schottky diodes each path drops 0.3V to 0.5V at load, dissipating 1.5W to 2.5W at 5A and creating hot spots. The LTC4414IMS8 regulates the PFET gate so each 36V-rated path conducts with a near-ideal forward drop, keeping efficiency high and temperature rise low across -40C to +125C (I grade, tested per the Analog Devices datasheet). One LTC4414 per source with its PFET forms an ORing stage; the STAT output can flag the active source to a supervisory MCU. Use matched PFETs on both paths so current sharing follows the controller sensing rather than diode Vf mismatch.
Recomendado
Industrial 24V Bus Backup Power
Factory PLCs, motor controllers, and instrumentation on 24V rails need ride-through when main power dips. The LTC4414IMS8's 36V rating provides roughly 50% headroom over a nominal 24V bus, and the I-grade -40C to +125C range covers unconditioned cabinets. Controlling a large external PFET, it buffers a backup battery or capacitor bank behind a near-ideal diode, so the backup engages without diode-drop sag on the logic rail. Size the PFET VDS at 40V to 60V and add TVS clamping for load-dump transients above 36V. Because controller quiescent overhead is small relative to the saved diode loss, total standby drain on the backup source is materially reduced versus a Schottky front end.
Recomendado
Automotive Auxiliary Power ORing
Automotive accessory rails combine battery, ignition-switched, and USB-charger sources; ORing them with diodes wastes power and causes voltage sag at cold crank. The LTC4414IMS8 controls a P-channel FET with a near-ideal drop, keeping the accessory rail stiff during cranking transients, and its 36V ceiling tolerates jump-start-class voltages on 12V systems (verify transient suppression beyond 36V). The I-grade -40C to +125C operating range matches under-hood-adjacent and cabin electronics environments. Use the CTL pin, driven by ignition logic, to prioritize sources: a high CTL forces STAT ON to connect the alternate source through an auxiliary PFET, per the datasheet switchover scheme. Note this part is not itself AEC-Q100 listed per available data, so qualify accordingly.
Recomendado
Solar / Multiple Source Energy Harvesting Front End
Energy harvesting systems combine a solar panel with a primary battery or USB maintenance input. Because harvested energy is scarce, every 100 mV of front-end loss matters: a Schottky ORing diode can consume a meaningful fraction of panel output at low irradiance, while the LTC4414IMS8's servo-controlled PFET conducts at a near-ideal forward drop, maximizing captured energy. The 36V rating covers common 12V/24V panels, and the low self-heating of the ideal-diode path suits sealed outdoor enclosures spanning the -40C to +125C I-grade range. The STAT open-drain output reports source status to the system MCU so firmware can log which source is live. Add reverse-blocking awareness and transient clamps at the panel input.
Recomendado
High-Current Server and Networking Backplane Power
Server backplane entry points OR multiple PSU feeds; at tens of amps a Schottky diode wastes watts per feed and complicates airflow planning. The LTC4414IMS8's architecture - controller plus large external PFET - moves the conduction loss into a low-RDS(on) MOSFET, holding the forward drop near the millivolt level and dramatically cutting heat per feed, with the 36V rating suited to intermediate-bus inputs. Placement of the 8-MSOP controller near the FET keeps gate and sense loops short for clean transient response. The STAT output enables per-feed health reporting to a BMC. For feeds beyond a single FET's current, parallel FETs are possible, though a dedicated high-current ORing controller should be evaluated at very high currents.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC4414IMS8 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC4414IMS8#PBF | LTC4414EMS8#PBF | LTC4414HVIMS8#PBF |
|---|---|---|---|---|
| Package | 8-MSOP (MS8) | 8-MSOP (MS8) - same | 8-MSOP (MS8) - same | 8-MSOP (MS8) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Operating Temperature | -40C to +125C (I grade, tested) | -40C to +125C | 0C to +85C | -40C to +125C |
| Function | PFET ideal-diode / PowerPath ORing controller | Identical | Identical | Identical, extended voltage |
| Status Output | Open-drain STAT, forced ON by high CTL | Same | Same | Same |
| Pb-Free / RoHS | Yes (#PBF suffix version) | Yes | Yes | Yes |
Diferenciadores clave
- Extended industrial temperature range (frente a LTC4414EMS8#PBF)
- Higher voltage margin option within same footprint (frente a LTC4414HVIMS8#PBF)
- Near-ideal diode efficiency versus Schottky ORing (frente a Passive Schottky diode ORing (e.g. generic 40V Schottky))
Notas de diseño
The LTC4414IMS8 itself carries negligible load current - the external P-channel MOSFET does. Estimated sizing: at 36V max input, select a PFET with VDS at least 40V to 60V so rail transients retain margin. Conduction loss is I^2 x RDS(on); for example, a 20 mohm FET at 5A dissipates an estimated 0.5W, versus a Schottky diode dropping 0.4V which would dissipate 2W at the same current. Verify the CTL pin is intentionally driven, since an internal current sink pulls it low when floating, changing the switchover priority.
Place the LTC4414 close to the PFET to keep the gate drive and source-sense loops short; long sense traces pick up noise and slow the ideal-diode servo response during switchover events. Provide a solid ground connection for the controller and generous copper under the MOSFET drain/source pads for the load current. Decouple the input with a 0.1uF ceramic near the IC supply pin, and include bulk capacitance on both sides of the PFET so load steps during source takeover do not collapse the rail faster than the controller can servo the gate.
Three frequent mistakes: (1) using a PFET with inadequate VDS rating that fails on 36V-rail transients; (2) ignoring the grade prefix - the LTC4414E is only specified to +85C, so using the E grade in a -40C environment voids the guaranteed specification; only the I grade is guaranteed and tested over -40C to +125C per the datasheet; (3) leaving CTL floating and assuming a defined state - the internal current sink pulls it low, so an intended high level must be actively driven. Also confirm the STAT open-drain output has an appropriate pull-up to the logic rail it reports to.
Información de cumplimiento
The #PBF ordering suffix denotes the lead-free, RoHS-compliant version stocked by DigiKey and Mouser. No REACH, halogen-free, or AEC-Q100 statements were found in the provided data; verify against the ADI product page before use in regulated applications.
