DATA SHEET
BQ2946xx Single-Cell Protector for Li-Ion Batteries
1 Features
- Single-Cell Overvoltage Monitor for Secondary Protection
- Fixed Programmable Delay Timer
- Fixed Overvoltage Protection
(OVP) Threshold
- Available Range of 3.85 V to 4.6 V
- Fixed OVP Delay Option: 4 s or 6.5 s
- High-Accuracy OVP:
± 10 mV - Low Power Consumption
ICC ≈ 1 µA
(VCELL(ALL) < VPROTECT) - Low Leakage Current per Cell Input < 100 nA
- Small Package Footprint
- 6-Pin SON
2 Applications
- Second-level protection in Li-ion battery packs in:
3 Description
The BQ2946xx family of products is a secondary-level overvoltage monitor and protector for Li-Ion battery pack systems. The cell is monitored for overvoltage condition and triggers an internal counter once the OVP threshold is exceeded; after a fixed set delay, the out is transitioned to a high level. The output is reset (goes low) if the cell voltage drops below the set threshold minus the hysteresis.
Device Information
| PART NUMBER(1) | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| BQ294602 | SON (6) | 2.00 mm × 2.00 mm |
| BQ294604 | ||
| BQ294624 | ||
| BQ294682 |
(1) For all available packages, see the orderable addendum at the
end of the data sheet.
Simplified Schematic5 Device Options
| TA | PART NUMBER | OVP (V) | DELAY TIME (s) |
|---|---|---|---|
| –40°C to +110°C | BQ294602 | 4.35 | 4 |
| BQ294604 | 4.35 | 6.5 | |
| BQ294624 | 4.45 | 6.5 | |
| BQ294682 | 4.225 | 4 |
6 Pin Configuration and Functions
Figure 6-1 DRV Package6-Pin SONTop ViewTable 6-1 Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| NC | 1 | — | No connection |
| OUT | 6 | OA | Output drive for external N-channel FET. |
| PWRPAD | Thermal Pad | — | VSS pin to be connected to the PWRPAD on the printed-circuit-board (PCB) for proper operation. |
| V1 | 2 | IA | Sense input for positive voltage of the cell. |
| VSS | 3 | P | Electrically connected to IC ground and negative terminal of the cell. |
| VSS | 4 | P | Electrically connected to IC ground and negative terminal of the cell. |
| VDD | 5 | P | Power supply |