Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Battery Configuration | 1-series Li-Ion / Li-Polymer pack |
| Gauging Method | Impedance Track technology |
| Protection | Integrated voltage/current protection with high-side protection FET drive |
| Authentication | SHA-256 responder |
| Current Measurement | 16-bit coulomb-counting ADC; 1 mΩ to 20 mΩ external sense resistor range |
| Host Interface | I²C up to 400 kHz |
| Low-Power Modes | 20 µA SLEEP, 10 µA SHIP, 5 µA SHELF, 0.2 µA SHUTDOWN stated typical features |
| Exact Package / Packing | DSBGA (YAH), 15 balls; 3000-piece large tape and reel |
Product Overview
BQ27Z746YAHR combines single-cell fuel gauging, pack protection, authentication, and FET control in one compact DSBGA device. Its Impedance Track algorithm models battery behavior and adapts gauging for aging, temperature, and rate effects, while the protection subsystem monitors voltage, current, temperature, and short-circuit conditions.
This is a pack-management device rather than only a state-of-charge monitor. The same design must coordinate sense-resistor placement, CHG/DSG gate-drive behavior, protection thresholds, thermistor measurement, and authentication provisioning. Selection therefore depends on whether the battery pack is intended to own these safety and security functions internally.
BQ27Z746 supports both high-side and low-side current sensing for a 1S pack. The coulomb counter accepts a 1 mΩ to 20 mΩ external sense-resistor range; resistor value determines measurement signal magnitude and power loss and must be matched to the pack current range.
For related devices, see HKEQGOO’s Battery Management category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | BQ27Z746YAHR |
| Cell Count | 1 series cell |
| Fuel-Gauge Algorithm | Impedance Track |
| Authentication | SHA-256 |
| Coulomb Counter | 16-bit integrating ADC, 3.74 µV stated resolution |
| General ADC | 16-bit delta-sigma ADC, 38 µV stated resolution |
| Sense Resistor | 1 mΩ to 20 mΩ recommended range |
| Temperature Measurement | Internal sensor plus 10 kΩ NTC support |
| Interface | I²C compatible, 400 kHz |
| Protection | OVP, UVP, OCC, OCD, SCD plus firmware temperature protection |
| FET Drive | High-side N-channel protection FET drivers |
| Supply Range | VDD 2.0 V to 5.5 V recommended |
| Package | DSBGA (YAH), 15 balls, 1.69 mm × 2.57 mm nominal body |
| Manufacturer Status | Active / Production |
| Part Marking | BQ27Z746 |
Functional Highlights
Gauging and protection share the same current-sense path
The coulomb counter measures the differential voltage across SRP and SRN while the protection logic also uses current information to evaluate overcurrent and short-circuit events. The sense resistor is therefore a joint gauging/protection component. Reducing resistance lowers dissipation but also reduces signal amplitude; increasing it improves signal level while increasing I²R loss.
High-side FET drive supports a smart-pack protection architecture
The device controls protection FETs while maintaining a pack-based communication and measurement architecture. FET ratings, gate network, pack connector arrangement, and fault-recovery policy should be reviewed as one system rather than as separate gauge and protector blocks.
Authentication belongs to the manufacturing flow
SHA-256 capability can be used to authenticate a battery pack, but the security benefit depends on provisioning, host challenge/response implementation, key handling, and manufacturing controls. Adding the device does not by itself create an authenticated pack unless those processes are implemented correctly.
Design Considerations
- Select the shunt from both measurement resolution and pack loss. The 1 mΩ to 20 mΩ range spans very different voltage drop and dissipation at high current.
- Choose high-side or low-side current sensing before laying out the pack. The approaches change common-mode and connector/reference routing.
- Coordinate protection thresholds with cell and FET ratings. Voltage, current, short-circuit and temperature settings must match actual pack components.
- Treat authentication keys as production assets. Device capability is only one part of a secure pack-authentication system.
- Use the low-power modes deliberately. SLEEP, SHIP, SHELF and SHUTDOWN serve different storage and runtime goals.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists BQ27Z746YAHR in the 15-ball DSBGA YAH package with a 3000-piece large tape-and-reel carrier, Level-1-260C-UNLIM MSL classification, an operating-temperature listing of −40°C to +85°C, and part marking BQ27Z746.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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