LTC6803IG-3#PBF

The LTC6803IG-3#PBF is a 3-cell battery monitor from Analog Devices (formerly Linear Technology) designed to monitor up to three series Li-ion cells in a high-voltage pack. It reports individual cell voltages (V1–V3) and the stack voltage, along with diagnostic/status flags. Communication is via a daisy-chainable, SPI-like serial interface to a host microcontroller; it typically draws power from the top-of-stack supply. The suffixes indicate package and rating: IG = Industrial-grade temperature range, PBF = Pb-free (RoHS) packaging, with “-3” denoting the 3-cell variant. The device is intended for BMS applications and is often used in multi-device chains to cover larger packs. It does not provide built-in cell balancing; balancing is performed externally. Key use-cases include automotive, energy storage, and portable systems requiring reliable 3-cell monitoring with low quiescent current and fault diagnostics.

Equivalent products for LTC6803IG-3#PBF (3–5 cell monitor) include other 3–5S stack monitors with SPI/I2C:
- TI BQ76920 (3–5S), BQ76930 (6–10S), BQ76940 (9–15S)
- Renesas ISL94202/ISL94203 (3–10S)
- Maxim/MAX178xx family (multi-cell BMS, check fit)
Note: verify cell count, interface, protections, and packaging for your design.

LTC6803IG-3#PBF is a three-cell battery monitor from Linear Technology. Key features include:
- Monitors up to 3 series cells (V1–V3) in a single package with high-voltage front end.
- Independent cell-voltage measurements with an on-chip ADC; high accuracy and resolution.
- Serial interface: SPI-like 3-wire communications, daisy-chainable to host microcontrollers.
- Temperature sensing input (external NTC thermistor) for pack monitoring.
- Robust diagnostics: open/short cell detection, per-cell overvoltage/undervoltage flags.
- Low quiescent current and sleep/low-power modes for extended battery life.
- Wide operating temperature range suitable for automotive/industrial use.
- Pb-free (PBF) package and RoHS-compliant; available in standard Linear Tech packaging.
- Package options typically include small-footprint 16-lead devices (e.g., MSOP/TSSOP/QFN variants).
Note: The device is a monitor (not a balancer) and is designed for daisy-chained multi-cell packs with a host MCU.

Manufacturer: Analog Devices, Inc. (the LTC6803 line was originally from Linear Technology, which Analog Devices acquired in 2017).
Company type: a global semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits.

LTC6803IG-3#PBF is a 3‑cell Li‑ion battery monitor used in:
- Battery Management Systems (BMS) for 3S packs in automotive 12V and light EVs
- e‑bikes, scooters, and power tools with 3S packs
- Stationary energy storage, solar/backup power systems built from 3S strings
- Portable/consumer electronics using compact 3S packs
- Industrial and telecom backup power and uninterruptible power supplies
- Medical devices and test/qualification of battery packs
Note: It monitors cell voltages (and protection) for 3-series configurations.

It comes in a 20‑pin TSSOP package (20‑lead Thin Shrink Small Outline), Pb‑free RoHS variant.