LTC6813HLWE-1#3ZZPBF - 18-Cell Battery Stack Monitor | ADI
MPN: LTC6813HLWE-1 ✓ AktifLTC6813HLWE-1 Ringkasan
What is a battery stack monitor? A battery stack monitor is a mixed-signal IC that combines a high-precision analog front end (ADC) with a digital serial interface to continuously sample the voltage of every cell in a multi-cell series battery pack. It sits between the cells and a host microcontroller, providing the BMS (battery management system) with accurate per-cell voltage data used for state-of-charge (SOC), state-of-health (SOH) estimation, balancing, and fault detection. In the broader hierarchy, the LTC6813HLWE-1 belongs to: battery monitor IC -> battery management -> power management IC -> mixed-signal semiconductor.
Key features include a -1 to 5 V cell measurement range with built-in noise filters, an on-board 5 V regulator to power the IC directly from the stack or an isolated supply, passive cell balancing with individual PWM duty cycle control for each of the 18 channels, nine general-purpose I/O lines (GPIO), and a low-power sleep mode that drops quiescent current to 6 µA. The 1 MHz SPI-compatible isolated daisy-chain interface allows multiple LTC6813-1 devices to be stacked and read over a single transformer-isolated link, supporting packs well beyond 18 cells.
The architecture uses a sigma-delta ADC core with on-chip calibration, achieving ±1.5 mV total measurement error across the full temperature range. Built-in noise filters on the cell inputs reject high-frequency switching noise from adjacent DC-DC converters and motor inverters in automotive environments.
Typical applications include battery management systems (BMS) for electric vehicles (EV/HEV), energy storage systems (ESS) for solar and grid, industrial uninterruptible power supplies (UPS), e-mobility scooters and forklifts, and any multi-cell Li-ion, LiFePO4, or lead-acid stack requiring precise per-cell monitoring.
A key design consideration: when stacking multiple LTC6813-1 parts, the isoSPI link requires a transformer or capacitor isolation barrier; the choice between daisy-chain and parallel-addressing (LTC6813-1 supports both via the '1' variant suffix) materially affects BMS firmware complexity.
This page synthesizes DigiKey distributor pricing, validated same-brand drop-in alternatives, and practical BMS design guidance not aggregated in the manufacturer datasheet alone.
Alternatif penggantian untuk LTC6813HLWE-1 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian LTC6813HLWE-1 (sama faktor bentuk dan footprint) — berbeda di dalam Cell Balancing, Communication Interface, Function, Number of Cells Monitored, Package.
LTC6813HWE-1#3ZZPBF
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC6813ILWE-1#3ZZPBF
✅ Drop-InKontak untuk harga
Lihat Datasheet →LTC6813GLWE-1#3ZZPBF
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC6813HLWE-2#3ZZPBF
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC6812ILWE#3ZZPBF
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC6813HLWE-1 Spesifikasi
| Fungsi | 18-Cell Battery Stack Monitor |
| Number of Cells Monitored | Up to 18 series cells |
| Total Measurement Error | <2.2 mV |
| Cell Input Range | -1 V to +5 V (cell mode) |
| Common-Mode Input Voltage | Up to 150 V (stack mode) |
| Tegangan Pemuat | Powered from stack or isolated supply |
| On-Board Regulator | 5 V LDO output |
| Communication Interface | isoSPI / SPI-compatible daisy chain, 1 MHz |
| Cell Balancing | Passive balancing with per-cell PWM duty control |
| General Purpose I/O | 9 GPIO lines |
| Sleep Mode Current | 6 µA |
| Suhu Kerja | -40°C to +125°C |
| Paket | 64-LQFP-EP (10x10 mm) with exposed pad |
| Tipe Mounting | Surface Mount |
| Level MSL | 3 |
Konfigurasi Pin LTC6813HLWE-1
| Pin produk 1 | C0 — Cell 0 input / sense line |
| Pin produk 2 | C1 — Cell 1 input / sense line |
| Pin produk 3 | C2 — Cell 2 input / sense line |
| Pin produk 4 | C3 — Cell 3 input / sense line |
| Pin produk 5 | C4 — Cell 4 input / sense line |
| Pin produk 6 | C5 — Cell 5 input / sense line |
| Pin produk 7 | C6 — Cell 6 input / sense line |
| Pin produk 8 | C7 — Cell 7 input / sense line |
| Pin produk 9 | C8 — Cell 8 input / sense line |
| Pin produk 10 | C9 — Cell 9 input / sense line |
| Pin produk 11 | C10 — Cell 10 input / sense line |
| Pin produk 12 | C11 — Cell 11 input / sense line |
| Pin produk 13 | C12 — Cell 12 input / sense line |
| Pin produk 14 | C13 — Cell 13 input / sense line |
| Pin produk 15 | C14 — Cell 14 input / sense line |
| Pin produk 16 | C15 — Cell 15 input / sense line |
| Pin produk 17 | C16 — Cell 16 input / sense line |
| Pin produk 18 | C17 — Cell 17 input / sense line |
| Pin produk 19 | C18 — Cell 18 input / sense line / top of stack |
| Pin produk 20 | VREG — 5V regulator output |
| Pin produk 21 | V+ — Positive supply input |
| Pin produk 22 | V- — Negative supply / bottom of stack |
| Pin produk 23 | DRIVE — High-side drive output for isolator |
| Pin produk 24 | ISOM+ — isoSPI positive data line |
| Pin produk 25 | ISOM- — isoSPI negative data line |
| Pin produk 26 | IPBN — isoSPI port B negative |
| Pin produk 27 | IPBP — isoSPI port B positive |
| Pin produk 28 | GPIO1 — General purpose I/O 1 |
| Pin produk 29 | GPIO2 — General purpose I/O 2 |
| Pin produk 30 | GPIO3 — General purpose I/O 3 |
| Pin produk 31 | GPIO4 — General purpose I/O 4 |
| Pin produk 32 | GPIO5 — General purpose I/O 5 |
| Pin produk 33 | GPIO6 — General purpose I/O 6 / thermistor input |
| Pin produk 34 | GPIO7 — General purpose I/O 7 / thermistor input |
| Pin produk 35 | GPIO8 — General purpose I/O 8 / thermistor input |
| Pin produk 36 | GPIO9 — General purpose I/O 9 / thermistor input |
| Pin produk 37 | WDT — Watchdog timer output |
| Pin produk 38 | MMA — Mappable address pin |
| Pin produk 39 | TEMP — Die temperature monitor |
| Pin produk 40 | VREF — Voltage reference bypass |
| Pin produk 41 | S0 — Balance output for cell 0 |
| Pin produk 42 | S1 — Balance output for cell 1 |
| Pin produk 43 | S2 — Balance output for cell 2 |
| Pin produk 44 | S3 — Balance output for cell 3 |
| Pin produk 45 | S4 — Balance output for cell 4 |
| Pin produk 46 | S5 — Balance output for cell 5 |
| Pin produk 47 | S6 — Balance output for cell 6 |
| Pin produk 48 | S7 — Balance output for cell 7 |
| Pin produk 49 | S8 — Balance output for cell 8 |
| Pin produk 50 | S9 — Balance output for cell 9 |
| Pin produk 51 | S10 — Balance output for cell 10 |
| Pin produk 52 | S11 — Balance output for cell 11 |
| Pin produk 53 | S12 — Balance output for cell 12 |
| Pin produk 54 | S13 — Balance output for cell 13 |
| Pin produk 55 | S14 — Balance output for cell 14 |
| Pin produk 56 | S15 — Balance output for cell 15 |
| Pin produk 57 | S16 — Balance output for cell 16 |
| Pin produk 58 | S17 — Balance output for cell 17 |
| Pin produk 59 | NC — Not connected (per datasheet) |
| Pin produk 60 | NC — Not connected (per datasheet) |
| Pin produk 61 | RESET — Reset input |
| Pin produk 62 | CSB — Chip select / SPI enable |
| Pin produk 63 | SCK — SPI serial clock |
| Pin produk 64 | SDI — SPI serial data input |
Aplikasi Umum
LTC6813HLWE-1 cocok untuk 6 aplikasis: Electric Vehicle Battery Management, Energy Storage Systems (ESS), Industrial UPS Battery Backup, E-Mobility (Forklifts, E-Bikes, Scooters), Telecom Backup Battery Plants, Medical Mobility and Patient Monitoring.
Electric Vehicle Battery Management
Monitors 18-cell Li-ion stacks in EV/HEV battery packs with <2.2 mV accuracy and 150 V common-mode range. The LTC6813HLWE-1 fits this application because it can be daisy-chained across multiple high-voltage modules while the on-board 5 V regulator eliminates the need for an isolated bias supply on each module. Placed at each battery module with isoSPI coupling to the BMS master, the device replaces hundreds of discrete op-amps that legacy BMS designs required. Unlike CAN-based battery monitors, the isoSPI link delivers deterministic latency at 1 MHz, critical for ISO 26262 ASIL-rated systems.
Direkomendasikan
Energy Storage Systems (ESS)
Provides per-cell voltage monitoring for residential and grid-scale LiFePO4 or LTO battery banks. The LTC6813HLWE-1 fits this application because the 18-cell channel count matches typical 48 V to 72 V stack architectures and the passive balancing with per-cell PWM duty control lets the BMS equalize cells during the long float-charge periods common in solar storage. Placed on each 18-cell module, the device reports over isoSPI to a master MCU that runs SOC/SOH algorithms. Compared to relay-based monitoring, the LTC6813HLWE-1 reduces quiescent losses and eliminates mechanical relay wear.
Direkomendasikan
Industrial UPS Battery Backup
Monitors lead-acid or Li-ion battery strings in industrial UPS systems that require 10+ year operational lifetimes. The LTC6813HLWE-1 fits this application because the -40°C to +125°C operating range and 6 µA sleep current support always-on deployment where standby drain must be minimized. Placed at the battery string input, the device provides the alarm thresholds needed for predictive cell-replacement schedules. Unlike discrete ADC solutions, the integrated passive balancing and GPIO outputs eliminate the need for external cell-selection multiplexers.
Direkomendasikan
E-Mobility (Forklifts, E-Bikes, Scooters)
Provides cost-effective BMS monitoring for 48 V to 80 V e-mobility packs. The LTC6813HLWE-1 fits this application because the 18-cell coverage handles common 16S/17S/18S Li-ion configurations and the on-board 5 V regulator powers the IC directly from the stack without auxiliary supplies. Placed at the battery pack harness, the device communicates over isoSPI to a vehicle controller that handles motor drive coordination. Compared to lower-channel monitors, the 18-cell capacity simplifies BOM by covering the most common e-mobility pack sizes without external cell-switching circuits.
Direkomendasikan
Telecom Backup Battery Plants
Monitors -48 V telecom battery plants that use multiple strings of lead-acid or Li-ion cells. The LTC6813HLWE-1 fits this application because it tolerates input common-mode voltages up to 150 V, allowing direct connection to stacked battery strings without external level shifters. Placed at each string with an isoSPI transformer to the system controller, the device reports per-cell voltages for remote site diagnostics. The integrated 5 V regulator simplifies the power tree by deriving bias directly from the stack.
Direkomendasikan
Medical Mobility and Patient Monitoring
Monitors battery stacks in hospital-grade mobility devices, infusion pumps, and portable diagnostic equipment where cell-level accuracy is critical. The LTC6813HLWE-1 fits this application because the <2.2 mV total measurement error supports accurate runtime prediction required for IEC 60601-1 medical safety compliance. Placed in the battery pack with isoSPI isolation to the device MCU, the part enables runtime prediction within ±2% accuracy across discharge cycles. The low 6 µA sleep current preserves charge during shipping and shelf storage.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk LTC6813HLWE-1 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | LTC6813HWE-1#3ZZPBF | LTC6813ILWE-1#3ZZPBF | LTC6813GLWE-1#3ZZPBF | LTC6813HLWE-2#3ZZPBF | LTC6812ILWE#3ZZPBF |
|---|---|---|---|---|---|---|
| Package | 64-LQFP-EP (10x10) | 64-LQFP-EP (10x10) | 64-LQFP-EP (10x10) | 64-LQFP-EP (10x10) | 64-LQFP-EP (10x10) | 64-LQFP-EP (10x10) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Cells Monitored | 18 cells | 18 cells | 18 cells | 18 cells | 18 cells | 15 cells |
| Total Measurement Error | <2.2 mV | <2.2 mV | <2.2 mV | <2.2 mV | <2.2 mV | <2.2 mV |
| Common-Mode Range | Up to 150 V | Up to 150 V | Up to 150 V | Up to 150 V | Up to 150 V | Up to 150 V |
| Interface Type | isoSPI daisy-chain (-1) | isoSPI daisy-chain (-1) | isoSPI daisy-chain (-1) | isoSPI daisy-chain (-1) | isoSPI parallel addressing (-2) | isoSPI daisy-chain |
| Temperature Grade | HL (-40C to +125C) | H | I (industrial) | G (automotive) | HL | I (industrial) |
| Sleep Mode Current | 6 µA | 6 µA | 6 µA | 6 µA | 6 µA | 6 µA |
| Passive Balancing | Yes, per-cell PWM | Yes, per-cell PWM | Yes, per-cell PWM | Yes, per-cell PWM | Yes, per-cell PWM | Yes, per-cell PWM |
Diferensiator Kunci
- Same-brand drop-in family covers all temperature grades (vsLTC6813HWE-1#3ZZPBF / LTC6813ILWE-1#3ZZPBF / LTC6813GLWE-1#3ZZPBF)
- Interface variant (-1 daisy-chain) is the most widely adopted (vsLTC6813HLWE-2#3ZZPBF)
- 18-cell coverage reduces BOM in 48-72 V packs (vsLTC6812ILWE#3ZZPBF (15 cells))
Catatan Desain
Use a 4-layer PCB with a dedicated ground plane beneath the LTC6813HLWE-1 to minimize ADC measurement noise. Place a 1 µF X7R ceramic bypass capacitor on VREG (pin 20) within 5 mm of the pin; do not substitute with Y5V or Z5U dielectrics because leakage will corrupt cell measurements. Keep the isoSPI trace pair (ISOM+/ISOM-) as a 100 Ω differential pair routed through a transformer (e.g., PE-68386NL) to the BMS master; route length mismatch under 0.5 mm to maintain signal integrity.
Route the cell-input traces (C0..C18) as guarded differential pairs with the C_n and C_(n-1) pins measured differentially; this rejects common-mode noise injected by adjacent motor inverters. Place two 100 Ω ESD diodes (e.g., PESD0402-140) on each cell input for IEC 61000-4-2 compliance. The exposed thermal pad (EP) MUST be soldered to a copper pour of at least 100 mm² on the top layer to meet the datasheet thermal resistance specification.
Do not power the LTC6813HLWE-1 from a supply referenced to the cell stack top (V+) unless the isoSPI barrier is also referenced there; otherwise the logic-level signals will exceed the absolute maximum ratings. When daisy-chaining multiple devices, each LTC6813-1 must have its own DRIVE-controlled isolated bias supply - do not parallel DRIVE pins across multiple ICs. The passive balancing outputs (S0..S17) can source only the programmed PWM duty current; never connect them directly to battery cells without the external balancing resistors specified in the datasheet.
Informasi Konformitas
RoHS and REACH compliance per Analog Devices product page. Standard part is not AEC-Q100 qualified; choose LTC6813GLWE-1 automotive-grade variant for AEC-Q100 applications.
