Device Overview
BQ76905RGRR is a battery monitor and protector for 2-series to 5-series lithium-based packs. The measurement subsystem includes a 16-bit delta-sigma voltage ADC and a dedicated simultaneous 16-/24-bit delta-sigma coulomb-counter path, while low-side NFET drivers and host-controlled cell balancing support pack protection. The I2C interface runs up to 400 kHz with optional CRC, and the exact RGRR orderable uses a 20-pin VQFN.
Confirmed Technical and Ordering Data
| Parameter | Confirmed value | Scope / condition |
|---|---|---|
| Device Function | Battery monitor and protector | 2S to 5S battery packs |
| Cell Count | 2 to 5 series cells | Li-ion, Li-polymer, LFP or LTO |
| Voltage Adc | 16-bit delta-sigma | cell voltage measurement |
| Cell Voltage Accuracy | 4 mV | typical |
| Coulomb Counter | Simultaneous 16-bit and 24-bit delta-sigma ADC | current measurement / charge integration |
| Current Sense Range | +/-200 mV | across sense resistor |
| Charge Integrator | 48 bit | accumulated charge integrator with timer |
| Fet Drivers | Integrated low-side NFET drivers | charge and discharge protection |
| Cell Balancing | Host-controlled | |
| Power Modes | NORMAL 32-175 uA; SLEEP 6 uA; DEEPSLEEP 2.7 uA; SHUTDOWN <1 uA | typical |
| Host Interface | I2C up to 400 kHz | optional CRC |
| Ldo | Programmable REGOUT | external system use |
| Package | VQFN-20 (RGR) | 3000-piece LARGE T&R |
| Temperature Range | -40 to 110 °C | exact orderable/package option |
Engineering Selection Guidance
The 2S-to-5S cell-count range is the first topology check. Voltage monitoring and coulomb counting then use different converters: the cell path is a 16-bit delta-sigma ADC, while current/charge integration uses the dedicated simultaneous 16-/24-bit delta-sigma coulomb-counter path. The +/-200-mV sense range is across the shunt resistor, so actual current range depends on the external shunt value and must not be reported as a fixed ampere rating. Power-mode currents, NFET driver topology, host-controlled balancing and the 400-kHz I2C interface should all be checked against the pack controller and standby-power plan.
Lifecycle and Procurement
Texas Instruments lists BQ76905RGRR as Active in the current exact-part information. This exact orderable uses the VQFN-20 (RGR) package with LARGE T&R packing and a package quantity of 3000. Lifecycle status does not indicate HKEQGOO stock, lead time, MOQ, or final availability.
