Analog Devices Inc. LTC6803HG-4#PBF

Overview

LTC6803HG-4#PBF from Analog Devices (formerly Linear Technology) is a high-temperature, 12-cell battery monitor IC with integrated delta-sigma ADC, precision 3.065V reference, 44-pin SSOP package, ±0.25% total measurement error at 3.6V, and passive cell balancing via internal 20Ω MOSFETs - used in electric vehicle battery management systems for accurate per-cell voltage acquisition under thermal stress.

For engineers reviewing the LTC6803HG-4#PBF datasheet, LTC6803HG-4#PBF pinout, LTC6803HG-4#PBF application, or LTC6803HG-4#PBF equivalent, key selection criteria include its –40°C to +125°C operating range, C0/V– Kelvin separation for improved Cell 1 accuracy, 13ms full-stack measurement time, and hardware shutdown mode drawing <1µA.

Technical Context

The LTC6803HG-4#PBF implements a 12-bit delta-sigma ADC with built-in noise filtering and 8ppm/°C reference drift, enabling 0.25% total measurement error across temperature. Its multiplexer supports up to 12 series-connected cells with individual C0–C12 inputs and S1–S12 discharge control outputs.

It operates in three power modes: hardware shutdown (<1µA), standby (12µA), and measure (55–1000µA), with configurable CDC timing. The device features open-wire detection (70–140µA test current), die temperature sensing (±5°C error), and dual thermistor inputs (VTEMP1/VTEMP2).

Key Specifications

Pinout & Package

Package: 44-lead plastic SSOP (G package), 0.209" body width, 0.025" lead pitch, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitoring applications.

Compared with LTC6803HG-4#PBF, LTC6813IG-1#PBF offers superior resolution but adds system complexity and cost, while BQ76952PWPR provides integrated power but sacrifices Cell 1 measurement fidelity in high-temp automotive deployments.

Availability

LTC6803HG-4#PBF is available at Aetrix Electronics and suitable for electric vehicle battery packs, high-power energy storage systems, and industrial backup battery applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6803HG-4#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains full product support, qualification, and manufacturing continuity for the LTC portfolio.

The LTC6803HG-4#PBF belongs to the LTC® Battery Monitoring IC family, engineered specifically for high-reliability, high-temperature battery management in automotive, aerospace, and industrial energy storage systems.

FAQ

What is the maximum total supply voltage supported by the LTC6803HG-4#PBF?

The LTC6803HG-4#PBF supports a maximum total supply voltage (V+ to V–) of 75V, as specified in its Absolute Maximum Ratings. This allows direct monitoring of up to 12 Li-ion cells (4.2V × 12 = 50.4V) with significant headroom for transient overvoltage events and stack-level safety margins in automotive and industrial applications.

How does the LTC6803HG-4#PBF achieve improved Cell 1 measurement accuracy compared to the LTC6803-2 variant?

The LTC6803HG-4#PBF achieves improved Cell 1 measurement accuracy by separating the C0 (bottom cell negative) input from the V– (supply return) pin, enabling a Kelvin connection that eliminates voltage drop errors in the V– PCB trace. In contrast, the LTC6803-2 internally connects C0 to V–, making Cell 1 accuracy dependent on trace resistance and current - a critical distinction confirmed in the Applications Information section.

Does the LTC6803HG-4#PBF support open-wire detection, and how is it implemented?

Yes, the LTC6803HG-4#PBF supports open-wire detection using a dedicated 70–140µA test current applied to each Cn input. This current flows through the cell interconnect and returns via V–, allowing the ADC to detect missing or broken connections by measuring anomalous voltage responses - a feature explicitly documented in the Electrical Characteristics table and verified across the –40°C to +125°C operating range.

What is the function of the WDTB pin on the LTC6803HG-4#PBF, and what happens when it asserts?

The WDTB (Watchdog Timer Output) pin on the LTC6803HG-4#PBF is an active-low open-drain output that asserts after 1–2.5 seconds of no valid serial command. When asserted, WDTB pulls down to V– and resets the configuration register to default values - including disabling all S1–S12 discharge FETs - ensuring fail-safe behavior during host processor lockup or communication failure in safety-critical BMS designs.

Can the LTC6803HG-4#PBF be powered from an isolated supply, and what design benefit does this provide?

Yes, the LTC6803HG-4#PBF can be powered from an isolated supply, as confirmed in the DESCRIPTION section and Figure 1. This technique eliminates battery stack current draw to zero during idle periods, significantly reducing parasitic drain in long-term storage or transport - a capability enabled by the independent V+ supply domain and hardware shutdown mode (<1µA leakage).