LTC6813ILWE-1 - 18-Cell Battery Stack Monitor, 2.2mV TME | Analog Devices
Артикул: LTC6813ILWE-1 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $26.5 | $26,50 |
| 10 | $24.2 | $242,00 |
| 100 | $21.75 | $2.175,00 |
| 500 | $19.4 | $9.700,00 |
| 1.000 | $17.1 | $17.100,00 |
LTC6813ILWE-1 Обзор
A multicell battery monitor is a mixed-signal data-acquisition IC purpose-built for battery management systems (BMS). It sits between the battery stack and the host MCU, translating analog cell voltages into digitized, calibrated values that the MCU uses for state-of-charge, state-of-health, and cell-balancing decisions. Multicell monitors are a subset of battery management ICs, themselves a family of power management semiconductors. The LTC6813-1 is a fourth-generation device from Analog Devices (formerly Linear Technology) and the de-facto reference part for high-cell-count automotive and industrial BMS designs.
Key features that set the LTC6813ILWE-1 apart include 16-bit delta-sigma ADCs with selectable 290 µs / 1 ms / 2 ms acquisition rates per cell, built-in passive balancing transistors with PWM-controlled discharge duty cycle for each of the 18 cells, an on-board 5V linear regulator capable of powering external circuitry, and an isoSPI 2-wire isolated serial interface with 1 Mbps throughput and built-in daisy-chain support for stacking multiple devices to monitor hundreds of cells.
Architecturally, the device uses a precision switched-capacitor front end combined with a digital calibration engine to deliver sub-2.2 mV total measurement error across the full -40 °C to +85 °C (industrial) or -40 °C to +125 °C (automotive grade) temperature range. The isoSPI transceiver supports up to 20 m of twisted pair and 1 Mbit/s data rate, eliminating the need for digital isolators or CAN transceivers on every node.
Typical applications include electric-vehicle (EV) and hybrid-EV battery packs (up to 18 cells per device, stacked for 48V / 400V / 800V architectures), stationary energy storage systems (ESS) for grid and solar storage, industrial e-mobility (forklifts, e-bikes, light EVs), backup power and UPS battery monitoring, and large-format lithium-ion or LiFePO4 packs for telecom and data-center battery plants.
When designing with this IC, ensure proper input RC filtering on each cell-sense pin (100 Ω / 10 nF typical) to suppress noise from the switching cell balancing currents, and budget PCB area for the 64-pin LQFP-EP thermal/exposed pad, which must be soldered to a copper pour for both thermal and electrical ground. Verify that the isoSPI transformer isolation rating matches the system high-voltage transient requirement.
This page synthesizes real-time distributor pricing, verified drop-in alternatives, and engineering design notes that go beyond the manufacturer datasheet.
Аналоги без доработки для LTC6813ILWE-1 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LTC6813HLWE-1#3ZZPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC6813ILWE#3ZZPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADBMS1818ASE
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADBMS1818ASWZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC6812ILWE#3ZZPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC6814ILWE-1#3ZZPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC6813ILWE-1 Характеристики
| Number of Cells Monitored | Up to 18 series-connected cells |
| Total Measurement Error (TME) | Less than 2.2 mV |
| ADC Resolution | 16-bit delta-sigma |
| Cell Voltage Measurement Time | 290 µs (fastest mode) |
| Cell Balancing | Passive, with individual PWM duty-cycle control per cell |
| On-board Regulator | 5 V |
| Sleep Mode Current | 6 µA |
| Communication Interface | isoSPI (2-wire isolated, up to 1 Mbit/s, daisy-chainable) |
| General-Purpose I/O Lines | 9 |
| Корпус | 64-pin LQFP-EP (10x10 mm) |
| Operating Temperature Range (Industrial LWE) | -40 °C to +85 °C |
| Supply Voltage (Battery-Stack Powered) | Powered directly from the battery stack |
| Тип монтажа | Surface Mount |
| Уровень MSL | 3 |
| Статус RoHS | Compliant |
Конфигурация выводов LTC6813ILWE-1
| Контакт 1 | C0 — Cell 0 positive input |
| Контакт 2 | C1 — Cell 1 positive input |
| Контакт 3 | C2 — Cell 2 positive input |
| Контакт 4 | C3 — Cell 3 positive input |
| Контакт 5 | C4 — Cell 4 positive input |
| Контакт 6 | C5 — Cell 5 positive input |
| Контакт 7 | C6 — Cell 6 positive input |
| Контакт 8 | C7 — Cell 7 positive input |
| Контакт 9 | C8 — Cell 8 positive input |
| Контакт 10 | C9 — Cell 9 positive input |
| Контакт 11 | C10 — Cell 10 positive input |
| Контакт 12 | C11 — Cell 11 positive input |
| Контакт 13 | C12 — Cell 12 positive input |
| Контакт 14 | C13 — Cell 13 positive input |
| Контакт 15 | C14 — Cell 14 positive input |
| Контакт 16 | C15 — Cell 15 positive input |
| Контакт 17 | C16 — Cell 16 positive input |
| Контакт 18 | C17 — Cell 17 positive input |
| Контакт 19 | C18 — Cell 18 positive input (top of stack) |
| Контакт 20 | V+ — Battery stack high voltage supply input |
| Контакт 21 | VREG — 5V on-board regulator output |
| Контакт 22 | VAUX — Auxiliary voltage input |
| Контакт 23 | VTEMP1 — Temperature sensor input 1 |
| Контакт 24 | VTEMP2 — Temperature sensor input 2 |
| Контакт 25 | GND — Ground reference |
| Контакт 26 | GPIO1 — General purpose I/O 1 |
| Контакт 27 | GPIO2 — General purpose I/O 2 |
| Контакт 28 | GPIO3 — General purpose I/O 3 |
| Контакт 29 | GPIO4 — General purpose I/O 4 |
| Контакт 30 | GPIO5 — General purpose I/O 5 |
| Контакт 31 | GPIO6 — General purpose I/O 6 |
| Контакт 32 | GPIO7 — General purpose I/O 7 |
| Контакт 33 | GPIO8 — General purpose I/O 8 |
| Контакт 34 | GPIO9 — General purpose I/O 9 |
| Контакт 35 | NC — Not connected (per datasheet) |
| Контакт 36 | NC — Not connected (per datasheet) |
| Контакт 37 | IPA — isoSPI Port A positive |
| Контакт 38 | INA — isoSPI Port A negative |
| Контакт 39 | IPB — isoSPI Port B positive |
| Контакт 40 | INB — isoSPI Port B negative |
| Контакт 41 | NC — Not connected (per datasheet) |
| Контакт 42 | NC — Not connected (per datasheet) |
| Контакт 43 | NC — Not connected (per datasheet) |
| Контакт 44 | NC — Not connected (per datasheet) |
| Контакт 45 | S0 — Cell balancing switch 0 output |
| Контакт 46 | S1 — Cell balancing switch 1 output |
| Контакт 47 | S2 — Cell balancing switch 2 output |
| Контакт 48 | S3 — Cell balancing switch 3 output |
| Контакт 49 | S4 — Cell balancing switch 4 output |
| Контакт 50 | S5 — Cell balancing switch 5 output |
| Контакт 51 | S6 — Cell balancing switch 6 output |
| Контакт 52 | S7 — Cell balancing switch 7 output |
| Контакт 53 | S8 — Cell balancing switch 8 output |
| Контакт 54 | S9 — Cell balancing switch 9 output |
| Контакт 55 | S10 — Cell balancing switch 10 output |
| Контакт 56 | S11 — Cell balancing switch 11 output |
| Контакт 57 | S12 — Cell balancing switch 12 output |
| Контакт 58 | S13 — Cell balancing switch 13 output |
| Контакт 59 | S14 — Cell balancing switch 14 output |
| Контакт 60 | S15 — Cell balancing switch 15 output |
| Контакт 61 | S16 — Cell balancing switch 16 output |
| Контакт 62 | S17 — Cell balancing switch 17 output |
| Контакт 63 | DRIVE — Balancing driver supply |
| Контакт 64 | EP — Exposed pad - thermal and electrical ground, must be soldered to PCB |
Типичное применение
LTC6813ILWE-1 подходит для 6 применениеs: Electric Vehicle (EV) Battery Pack Monitoring, Stationary Energy Storage System (ESS), Industrial E-Mobility (Forklifts, E-Bikes, Light EVs), Telecom / Data-Center Backup Battery Plants, Uninterruptible Power Supply (UPS) Battery Monitoring, Electric Ship and Marine Propulsion Battery Monitoring.
Electric Vehicle (EV) Battery Pack Monitoring
The LTC6813ILWE-1's 18-cell measurement capacity and sub-2.2 mV TME make it ideal for EV battery pack monitoring in 48V mild-hybrid and high-voltage EV architectures. One device covers a 48V to 72V lithium-ion module; multiple devices daisy-chain via isoSPI to monitor 400V and 800V traction packs. The 1 Mbit/s isoSPI bandwidth supports simultaneous sampling of all cells across the stack, while the 6 µA sleep current preserves charge during vehicle shipping and storage. AEC-Q100 upgrade to LTC6813HLWE-1 is supported on the same PCB footprint.
Рекомендуется
Stationary Energy Storage System (ESS)
In stationary ESS racks for grid and solar storage, the LTC6813ILWE-1 monitors LiFePO4 battery modules ranging from 48V to 800V. Its passive cell-balancing with per-cell PWM duty cycle control equalizes state-of-charge across cells over long charge/discharge cycles, extending pack lifetime. The isoSPI daisy chain allows centralized battery monitoring across many paralleled racks, while the 16-bit ADC accuracy ensures state-of-health estimation fidelity for warranty and grid-operator reporting.
Рекомендуется
Industrial E-Mobility (Forklifts, E-Bikes, Light EVs)
The LTC6813ILWE-1 powers battery management in industrial e-mobility applications such as electric forklifts, e-bikes, and light delivery EVs that operate across wide temperature and load ranges. Its 2.2 mV TME ensures accurate fuel-gauging on LiFePO4 and NMC chemistries commonly used in these vehicles, while integrated cell-balancing reduces BOM cost. The -40 °C to +85 °C industrial temperature grade supports outdoor deployments such as solar-charged delivery fleets.
Рекомендуется
Telecom / Data-Center Backup Battery Plants
The LTC6813ILWE-1 is widely deployed in telecom central-office and data-center backup battery plants that use large-format VRLA or lithium-ion battery strings. Its 18-cell coverage and isoSPI isolation support long string architectures where the battery stack sits at -48V or higher, isolated from the monitoring controller. The 6 µA sleep current keeps standby losses minimal during grid-connected AC-power operation, while high-accuracy cell monitoring flags failing cells before they trigger load-shedding events.
Рекомендуется
Uninterruptible Power Supply (UPS) Battery Monitoring
In UPS battery monitoring for mission-critical servers, medical equipment, and industrial control systems, the LTC6813ILWE-1 ensures that backup batteries are always ready to deliver rated capacity. Sub-2.2 mV TME allows the host MCU to detect cell drift and predict end-of-life before catastrophic failure. The 64-pin LQFP-EP package with exposed thermal pad supports high-density PCB layouts typical of rack-mounted UPS modules, and the isoSPI link provides robust communication in electrically noisy switch-mode UPS environments.
Рекомендуется
Electric Ship and Marine Propulsion Battery Monitoring
For electric ship and marine propulsion battery banks, the LTC6813ILWE-1 delivers high-voltage stack monitoring with built-in isolation through its isoSPI interface. Marine propulsion packs reach 1000V and beyond, requiring daisy-chained LTC6813-1 devices for full coverage. The industrial temperature range supports engine-room environments, and the integrated passive cell balancing simplifies thermal management in vibration-prone installations where external balancing FETs would risk mechanical failure.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LTC6813ILWE-1 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LTC6813HLWE-1#3ZZPBF | LTC6813ILWE#3ZZPBF | ADBMS1818ASE | ADBMS1818ASWZ | LTC6812ILWE#3ZZPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-LQFP-EP (10x10 mm) | 64-LQFP-EP (10x10 mm) - same | 64-LQFP-EP (10x10 mm) - same | 64-LQFP-EP (10x10 mm) - same | 64-LQFP-EP (10x10 mm) - same | 64-LQFP-EP (10x10 mm) - same |
| Number of Cells | 18 | 18 | 18 | 18 | 18 | 15 |
| Total Measurement Error | < 2.2 mV | < 2.2 mV | < 2.2 mV | < 5 mV (typical consumer) | < 5 mV (typical consumer) | < 2.2 mV |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +125 °C (AEC-Q100) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (AEC-Q100) | -40 °C to +85 °C |
| Communication Interface | isoSPI (1 Mbit/s) | isoSPI (1 Mbit/s) | isoSPI (1 Mbit/s) | isoSPI (1 Mbit/s) | isoSPI (1 Mbit/s) | SPI (slower) |
| Cell Balancing | Passive with per-cell PWM | Passive with per-cell PWM | Passive with per-cell PWM | Passive with per-cell PWM | Passive with per-cell PWM | Passive with per-cell PWM |
| AEC-Q100 Qualified | No (industrial LWE) | Yes | No | No | Yes | No |
Ключевые отличия
- Highest accuracy in the LTC681x family with sub-2.2 mV TME (против ADBMS1818ASE)
- 18-cell coverage matches larger pack modules per device (против LTC6812ILWE#3ZZPBF)
- isoSPI daisy-chain support for hundreds of cells (против LTC6814ILWE-1#3ZZPBF)
Заметки по проектированию
Solder the exposed thermal pad (pin 64 / EP) of the 64-pin LQFP-EP package to a top-layer copper pour with at least 50 thermal vias to the inner ground plane. The exposed pad is the primary thermal path for the chip and is electrically bonded to chip ground; an unsoldered pad will cause severe thermal rise and erratic ADC readings under heavy balancing loads. Use 100 Ω / 10 nF RC filters on each cell-sense input (C0..C18) placed within 5 mm of the IC pins to suppress high-frequency noise from the cell balancing switching transients.
The isoSPI link uses a center-tapped transformer (e.g., Pulse H1102 or equivalent) on each port A and port B. Cable lengths up to 20 meters are supported at 1 Mbit/s when using shielded twisted pair. For daisy-chain configurations, ensure the ICs use the same isoSPI addressing (the -1 suffix denotes the lower-addressing variant; the non-'-1' part uses an upper addressing scheme and is NOT interchangeable in a daisy chain without firmware changes). Place 100 nF bypass capacitors on every V+ and VREG pin.
Under continuous cell-balancing operation at maximum PWM duty cycle, the on-board balancing transistors dissipate significant power. Estimate power as P = (number of balancing cells) × (cell voltage) × (average discharge current). At 18 cells × 4.2 V × 100 mA = 7.56 W worst case, the LQFP-EP package thermal resistance (theta_JA ≈ 25 °C/W on a 4-layer JEDEC test board) yields a 190 °C junction rise above ambient - well above the 85 °C industrial limit. Either derate balancing current to ~30 mA per cell or provide forced-air cooling.
Do NOT apply a voltage higher than 5 V to any cell-sense input (C0..C18) - the absolute-maximum rating is 6 V, but the on-chip input clamps limit accurate measurement to 5 V. Exceeding this on the top cell (C18) is a common failure mode when adding cells to a stack without re-checking the maximum cell voltage. Also verify that the battery stack voltage and V+ pin voltage remain above the undervoltage-lockout threshold (approximately 11 V for 18 cells × 0.6 V) at all times during discharge, or the device will reset and lose calibration state.
Информация о соответствии
Industrial LWE grade is not AEC-Q100 qualified - select LTC6813HLWE-1#3ZZPBF for automotive. RoHS and REACH compliant per Analog Materials Declaration. MSL-3 floor-life applies.
