LM74910H-Q1 - 65V Automotive Ideal Diode Controller | TI
Артикул: LM74910H-Q1 ✓ АктивенLM74910H-Q1 Обзор
An ideal diode controller is a power-management IC that replaces a physical diode in power path protection (PPP) and power ORing circuits. Instead of a silicon diode's fixed ~0.7V forward drop, the controller senses current direction and adjusts the gate of an external MOSFET to regulate the forward voltage to millivolts, dramatically reducing conduction loss and heat. Within the power management hierarchy, ideal diode controllers sit alongside hot-swap and eFuse controllers as front-end protection devices guarding automotive ECUs, industrial modules, and server power rails against reverse polarity, load dump, overcurrent, and faults.
Key features of the LM74910H-Q1 include 74V absolute maximum rating, reverse input protection down to -65V, and 10.5mV anode-to-cathode forward voltage regulation for near-zero conduction loss. The low -10.5mV reverse detection threshold with fast 0.5us turn-off response blocks reverse current before it can flow. A 20mA peak DGATE drive enables fast MOSFET turn-on, and a 200-kHz analog current sense (ACS) output provides continuous current monitoring. An adjustable overcurrent threshold triggers the integrated circuit breaker, and a low-quiescent-current SLEEP mode conserves battery in always-connected modules.
Technically, the LM74910H-Q1 uses a common-drain back-to-back MOSFET topology: one FET blocks reverse current in normal operation, while the pair isolates the load during faults or when input falls outside the programmed UV/OV window. The H-suffix variant offers extended protection headroom suited to 12V and 24V automotive battery rails exposed to ISO load-dump type transients. Fast comparator-based reverse detection minimizes body-diode conduction time, keeping power dissipation low during voltage transients between supplies.
Typical applications include automotive reverse-battery and load-dump protection modules, N+1 redundant power ORing in ECUs and domain controllers, and front-end protection for infotainment, ADAS, and telematics units. The fault output simplifies diagnostics reporting to the vehicle host processor.
Design consideration: keep the EN pin supply-conditioned rather than tied directly to a raw 12V battery rail if ISO 16750-2 transient immunity must be demonstrated - TI E2E discussions highlight this exact use case, and resistor conditioning with clamping preserves the device through reverse polarity tests.
This page synthesizes distributor availability, drop-in alternatives within the LM749x0-Q1 and LM749xx-Q1 families, and practical design notes not consolidated in the manufacturer datasheet.
Аналоги без доработки для LM74910H-Q1 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
LM74910-Q1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM74912-Q1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM74900-Q1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LM74910H-Q1 Максимальные параметры и электрические характеристики
| Product Type | Automotive ideal diode controller with circuit breaker |
| Диапазон входного напряжения | 3 V to 65 V |
| Absolute Maximum Input Rating | 74 V |
| Reverse Input Protection | Down to -65 V |
| Forward Voltage Regulation (A to C) | 10.5 mV |
| Reverse Detection Threshold | -10.5 mV |
| Reverse Current Turn-off Response | 0.5 us |
| Peak Gate Drive Current (DGATE) | 20 mA |
| Analog Current Sense Frequency | 200 kHz |
| Protection Features | Circuit breaker, undervoltage, overvoltage, fault output |
| MOSFET Configuration | External back-to-back N-channel, common drain |
| Low Power Mode | SLEEP mode (low quiescent current) |
| Диапазон рабочих температур | -40C to +125C |
| Qualification | AEC-Q100 qualified |
| Корпус | 24-VQFN (4x4 mm) (RGE) |
| Тип монтажа | Surface Mount |
| Выходное напряжение | N/A (controller, drives external MOSFETs) |
Руководство по цоколевке LM74910H-Q1 в корпусе 24-vqfn (4x4 mm) (rge)
Цоколевка для LM74910H-Q1 (корпус 24-vqfn (4x4 mm) (rge)). Этот силовой прибор имеет выводы затвора, стока и истока. Для неполяризованных корпусов обратитесь к техническому описанию производителя для точной ориентации вывода 1 и деталей посадочного места. Типичные применения включают проектирование источников питания, управление двигателями и коммутацию нагрузки.
Нет подробных данных о распиновке для LM74910H-Q1.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
LM74910H-Q1 подходит для 6 применениеs: Automotive Reverse Battery Protection, N+1 Redundant Power ORing, ADAS Domain Controller Front-End Protection, Industrial 24V PLC Input Protection, Telematics and Always-On Battery Modules, Test and Measurement Power Inputs.
Automotive Reverse Battery Protection
The LM74910H-Q1 is purpose-built for reverse-battery protection in 12V and 24V automotive ECUs. Its 3V to 65V operating input with 74V absolute maximum rating and -65V reverse protection withstands jump start, load dump, and reversed battery connection events defined in automotive transient environments. Replacing a series Schottky diode with the LM74910H-Q1 plus a low-RDS(on) N-channel MOSFET reduces conduction loss from roughly 0.5W per amp to tens of milliwatts, cutting heat sink requirements. The 0.5us reverse turn-off blocks reverse current before MOSFET body conduction heats the device, while the fault output reports reverse or overcurrent events to the host microcontroller for diagnostic logging.
Рекомендуется
N+1 Redundant Power ORing
In N+1 redundant power architectures, multiple supplies feed a common load through ideal diodes so any failed supply is automatically isolated. The LM74910H-Q1's 10.5mV forward regulation minimizes bus voltage droop and dissipation compared with diode ORing, while the fast -10.5mV reverse detection prevents back-feeding a failed or sagging source. The 200-kHz analog current sense output gives a per-channel current telemetry signal, letting the system controller verify load sharing among paralleled supplies. AEC-Q100 qualification and -40C to +125C operation extend this topology from server and telecom backplanes into vehicular domain controllers where availability requirements are equally strict.
Рекомендуется
ADAS Domain Controller Front-End Protection
ADAS domain controllers draw multi-amp loads from vehicle battery rails that see transients and cranking undervoltage. The LM74910H-Q1 front end blocks reverse current during cranking, disconnects the load during overvoltage events, and trips its circuit breaker on overcurrent faults, protecting expensive processors downstream. The UV/OV window can be programmed to ride through cranking sags while still isolating the load from genuine brownout. Because the device drives external MOSFETs, designers scale the power stage to processor current needs without changing the controller. Its SLEEP mode limits controller battery drain in always-connected modules that remain powered during vehicle-off states.
Рекомендуется
Industrial 24V PLC Input Protection
Industrial 24V control panels face miswiring, inductive load dumps, and brownout conditions similar to automotive environments. The LM74910H-Q1's 65V continuous rating and 74V absolute maximum give margin on 24V DIN-rail systems, and -65V reverse tolerance protects against reversed supply wiring in the field. The integrated circuit breaker replaces panel fuses with resettable electronic protection, reducing maintenance visits, while the fault output wires to PLC diagnostics inputs. SLEEP mode benefits battery-backed remote I/O nodes that must conserve charge between maintenance cycles. AEC-Q100 qualification provides industrial-grade reliability assurance beyond standard commercial temperature parts.
Рекомендуется
Telematics and Always-On Battery Modules
Telematics control units remain powered during vehicle-off states, making battery drain critical. The LM74910H-Q1's low quiescent current SLEEP mode minimizes controller overhead, while the ideal diode function isolates the unit from reverse battery conditions during service. The 200-kHz analog current sense output enables continuous current logging, useful for fleet battery health analytics. Its wide 3V to 65V input survives cold crank down to 3V operation and load dump excursions without additional series protection. With -65V reverse rating and a fault output feeding the telematics processor, field failures are reported before a depleted or abused battery strandss the vehicle.
Рекомендуется
Test and Measurement Power Inputs
Bench and field instruments frequently encounter misconnected or over-voltage inputs from users probing unknown sources. An LM74910H-Q1 front end tolerates 65V continuous and 74V peak inputs, blocks reverse connection down to -65V without a series diode drop, and electronically disconnects on overcurrent. The near-zero 10.5mV forward regulation means the measured circuit sees full supply voltage, preserving measurement accuracy that a series protection diode would distort. Fast 0.5us reverse turn-off limits charge injection when polarity flips during a test. SLEEP mode suits portable battery instruments, and the fault output can trigger an on-screen warning displayed to the operator.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LM74910H-Q1 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM74910-Q1 | LM74912-Q1 | LM74900-Q1 |
|---|---|---|---|---|
| Package | 24-VQFN (4x4 mm) | 24-VQFN (4x4 mm) - same | 24-VQFN (4x4 mm) - same | 24-VQFN (4x4 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 3 V to 65 V | 3 V to 65 V | 3 V to 65 V | 3 V to 65 V |
| 200-kHz Analog Current Sense | Yes | Yes | No | No |
| Circuit Breaker | Yes | Yes | Yes | Yes |
| SLEEP Mode | Yes | Yes | Yes | Yes |
| AEC-Q100 | Qualified (-40C to +125C) | Qualified | Qualified | Qualified |
Ключевые отличия
- 200-kHz analog current sense output for load monitoring (против LM74912-Q1)
- 74V absolute maximum with -65V reverse tolerance (против LM74910-Q1)
- Trade-off: no integrated MOSFET (против LM74912-Q1)
Заметки по проектированию
Do not tie the EN pin directly to a raw 12V battery rail in ISO 16750-2 test environments. TI E2E forum threads (January 2026) document this exact scenario: reverse polarity and load dump transients can exceed the EN pin absolute maximum when it is hard-wired to the battery. Use a series resistor with a clamp diode or a small conditioning network so EN sees a scaled, clamped representation of battery voltage while remaining enabled during normal operation.
Estimate: the controller itself dissipates little power; most heat comes from the external N-channel MOSFETs. For a 10A load with a 2 mOhm RDS(on) FET, conduction loss is I^2 x R = 0.2W per FET path, but during a 0.5us reverse event the body diode may conduct briefly. Choose MOSFETs whose SOA covers the worst-case short-circuit trip delay of the circuit breaker, and verify the UV/OV programming divider resistors are rated for the 65V maximum input.
Place the HGATE/DGATE driver loops short and symmetric to the two back-to-back MOSFETs to minimize gate ringing during the 0.5us reverse turn-off. Kelvin-connect the current-sense path to the MOSFET terminals so the circuit breaker threshold is accurate. Provide a low-ESR ceramic input capacitor close to the VIN/ANODE pin and follow the LM749x0-Q1 datasheet layout section for the analog ground connection of the 200-kHz ACS output filter.
Информация о соответствии
AEC-Q100 qualification for -40C to +125C confirmed by TI product page and datasheet. RoHS/REACH declarations available from the TI environmental compliance section of ti.com.
