Product overview
Description
The L9961 is part of a complete battery pack monitoring, balancing, and protection system for Li-Ion and Li-Polymer cells in 3, 4 or 5 series configurations. The L9961 uses a high precision ADC to provide cell voltage, stack voltage and temperature conversion via external NTC. Voltage monitoring functions are cyclically performed with a programmable loop time. Stack current is also monitored via a high accuracy CSA, continuously running and performing also Coulomb Counting. Cell balancing is available and can be simultaneously activated on all cells. IC configuration and information exchange for SOC/SOH estimation are performed via I2C peripheral. The IC also integrates a dual pre-driver programmable in both HS/LS configurations for driving pack relays. L9961 also implements battery pack fuse protection to prevent fire and explosion hazards. A 3.3 V regulator with a high current capability is available for supplying pack controller and other external circuitry in both standby and normal operation modes. The IC protects the battery pack against over/under voltage conditions and monitors for over/under temperature. It also features protection against over current (both directions) and short-circuit in discharge events. Safety-relevant configurations can be stored in the internal NVM to avoid re-programming the device at each wakeup.
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All features
- 2 μA SHIPMENT - DEEP SLEEP mode current and 5 μA Standby consumption (with VREG LDO active)
- Integrated 3.3 V VREG LDO for supplying MCU and LEDs
- Measures Cell Voltage (3 to 5 cells), with Over/Under voltage detection and Balance Under voltage protection
- 12-bit voltage measurement with maximum error of ± 15 mV in the [1.5 – 4.5] V range, for -40 °C < TJ < 105 °C
- Measures Stack Voltage, with Over/Under voltage detection and Plausibility Check vs. Sum Of Cells
- Measures Pack Temperature via NTC, with Over/Under Temperature detection
- Ratiometric temperature measurement with ± 0.8% max. gain error in the [0.2 – VREG] V range, for -40 °C < TJ < 105 °C
- Measures Battery Current, with Coulomb Counting, Over current (both directions) and Short-circuit in discharge protection.
- 16-bit signed current measurement with maximum error of 0.25%, for -40 °C < TJ < 120 °C after customer end of line calibration with a single point
- I2C peripheral for device programming and data transfers over I2C bus
- Cell balancing supporting up to 70 mA per cell
- Dual configurable HS/LS pre-driver for pack relay management
- Pack fuse management
- Embedded NVM for configuration parameters storage
- High hot plug robustness
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STMicroelectronics - L9961
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L9961 | Active | VFQFPN 5X5X1 32L P0.5 | Industrial | Ecopack2 | |
| L9961TR | Active | VFQFPN 5X5X1 32L P0.5 | Industrial | Ecopack2 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Order from distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| L9961TR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | VFQFPN 5X5X1 32L P0.5 | 85 | -40 | PHILIPPINES | | ||
| L9961 | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tray | VFQFPN 5X5X1 32L P0.5 | 85 | -40 | PHILIPPINES | | ||
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors