LTC6813HLWE-1#3ZZPBF - 18-Cell Battery Stack Monitor | ADI
MPN: LTC6813HLWE-1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $17.2 | $172.00 |
| 100 | $15.45 | $1,545.00 |
| 500 | $13.9 | $6,950.00 |
| 1,000 | $12.4 | $12,400.00 |
LTC6813HLWE-1 Overview
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.
Drop-in alternatives for LTC6813HLWE-1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC6813HLWE-1 (same form factor and footprint) — differing in Cell Balancing, Communication Interface, Function, Number of Cells Monitored, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6813HWE-1#3ZZPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6813ILWE-1#3ZZPBF
✅ Drop-In✓ In Stock
$13.22 / Unit
View Datasheet →LTC6813GLWE-1#3ZZPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6813HLWE-2#3ZZPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6812ILWE#3ZZPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6813HLWE-1 Specifications
| Function | 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) |
| Supply Voltage | 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 |
| Operating Temperature | -40°C to +125°C |
| Package | 64-LQFP-EP (10x10 mm) with exposed pad |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
LTC6813HLWE-1 Pin Configuration
| Pin 1 | C0 — Cell 0 input / sense line |
| Pin 2 | C1 — Cell 1 input / sense line |
| Pin 3 | C2 — Cell 2 input / sense line |
| Pin 4 | C3 — Cell 3 input / sense line |
| Pin 5 | C4 — Cell 4 input / sense line |
| Pin 6 | C5 — Cell 5 input / sense line |
| Pin 7 | C6 — Cell 6 input / sense line |
| Pin 8 | C7 — Cell 7 input / sense line |
| Pin 9 | C8 — Cell 8 input / sense line |
| Pin 10 | C9 — Cell 9 input / sense line |
| Pin 11 | C10 — Cell 10 input / sense line |
| Pin 12 | C11 — Cell 11 input / sense line |
| Pin 13 | C12 — Cell 12 input / sense line |
| Pin 14 | C13 — Cell 13 input / sense line |
| Pin 15 | C14 — Cell 14 input / sense line |
| Pin 16 | C15 — Cell 15 input / sense line |
| Pin 17 | C16 — Cell 16 input / sense line |
| Pin 18 | C17 — Cell 17 input / sense line |
| Pin 19 | C18 — Cell 18 input / sense line / top of stack |
| Pin 20 | VREG — 5V regulator output |
| Pin 21 | V+ — Positive supply input |
| Pin 22 | V- — Negative supply / bottom of stack |
| Pin 23 | DRIVE — High-side drive output for isolator |
| Pin 24 | ISOM+ — isoSPI positive data line |
| Pin 25 | ISOM- — isoSPI negative data line |
| Pin 26 | IPBN — isoSPI port B negative |
| Pin 27 | IPBP — isoSPI port B positive |
| Pin 28 | GPIO1 — General purpose I/O 1 |
| Pin 29 | GPIO2 — General purpose I/O 2 |
| Pin 30 | GPIO3 — General purpose I/O 3 |
| Pin 31 | GPIO4 — General purpose I/O 4 |
| Pin 32 | GPIO5 — General purpose I/O 5 |
| Pin 33 | GPIO6 — General purpose I/O 6 / thermistor input |
| Pin 34 | GPIO7 — General purpose I/O 7 / thermistor input |
| Pin 35 | GPIO8 — General purpose I/O 8 / thermistor input |
| Pin 36 | GPIO9 — General purpose I/O 9 / thermistor input |
| Pin 37 | WDT — Watchdog timer output |
| Pin 38 | MMA — Mappable address pin |
| Pin 39 | TEMP — Die temperature monitor |
| Pin 40 | VREF — Voltage reference bypass |
| Pin 41 | S0 — Balance output for cell 0 |
| Pin 42 | S1 — Balance output for cell 1 |
| Pin 43 | S2 — Balance output for cell 2 |
| Pin 44 | S3 — Balance output for cell 3 |
| Pin 45 | S4 — Balance output for cell 4 |
| Pin 46 | S5 — Balance output for cell 5 |
| Pin 47 | S6 — Balance output for cell 6 |
| Pin 48 | S7 — Balance output for cell 7 |
| Pin 49 | S8 — Balance output for cell 8 |
| Pin 50 | S9 — Balance output for cell 9 |
| Pin 51 | S10 — Balance output for cell 10 |
| Pin 52 | S11 — Balance output for cell 11 |
| Pin 53 | S12 — Balance output for cell 12 |
| Pin 54 | S13 — Balance output for cell 13 |
| Pin 55 | S14 — Balance output for cell 14 |
| Pin 56 | S15 — Balance output for cell 15 |
| Pin 57 | S16 — Balance output for cell 16 |
| Pin 58 | S17 — Balance output for cell 17 |
| Pin 59 | NC — Not connected (per datasheet) |
| Pin 60 | NC — Not connected (per datasheet) |
| Pin 61 | RESET — Reset input |
| Pin 62 | CSB — Chip select / SPI enable |
| Pin 63 | SCK — SPI serial clock |
| Pin 64 | SDI — SPI serial data input |
Typical Applications
LTC6813HLWE-1 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for LTC6813HLWE-1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Same-brand drop-in family covers all temperature grades (vs LTC6813HWE-1#3ZZPBF / LTC6813ILWE-1#3ZZPBF / LTC6813GLWE-1#3ZZPBF)
- Interface variant (-1 daisy-chain) is the most widely adopted (vs LTC6813HLWE-2#3ZZPBF)
- 18-cell coverage reduces BOM in 48-72 V packs (vs LTC6812ILWE#3ZZPBF (15 cells))
Design Notes
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.
Compliance Information
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.
