Device Overview
BQ25730RSNR is an I2C-controlled NVDC buck-boost battery-charge controller for 1- to 5-cell battery systems, with power-path control and USB-C PD OTG operation. The charger input operates from 3.5 V to 26 V, while OTG output can be programmed from 3 V to 24 V. Its high-current limits are explicitly tied to the external sense-resistor value, so the current figures must be read together with the 5 mΩ or 10 mΩ sensing configuration rather than as unconditional device-output ratings.
Confirmed Technical and Ordering Data
| Parameter | Confirmed value | Scope / condition |
|---|---|---|
| Device Function | I2C-controlled 1- to 5-cell NVDC buck-boost battery charge controller with power-path control and USB-C PD OTG | |
| Input Voltage | 3.5 to 26 V | charger input operating range |
| Output / Battery Range | 1 to 5 series cells; OTG output 3 to 24 V | battery charging scope; OTG voltage is programmable with 8 mV resolution |
| Charge Current | up to 16.2 A with 5 mΩ sense resistor; up to 8.1 A with 10 mΩ sense resistor | maximum charge-current settings; charge-current resolution is 128 mA / 64 mA for 5 mΩ / 10 mΩ sense resistance |
| Input Current Limit | up to 10 A with 5 mΩ sense resistor; up to 6.35 A with 10 mΩ sense resistor | 100 mA / 50 mA resolution respectively |
| OTG Current Limit | up to 12.7 A with 5 mΩ sense resistor; up to 6.35 A with 10 mΩ sense resistor | 100 mA / 50 mA resolution respectively |
| Switching Frequency | 400 or 800 kHz | programmable |
| Control Interface | I2C | host-controlled configuration |
| Monitoring | Integrated 8-bit ADC | monitors voltage, current, and power |
| Regulation Accuracy | charge voltage ±0.5%; charge current ±3%; input current ±2.5%; input/charge current monitor ±2% | manufacturer headline accuracy limits |
| Package | WQFN-32 (RSN) | exact orderable package |
| Temperature Range | -40 to 85 °C | exact orderable/package option |
Engineering Selection Guidance
The external sense resistor is a central design choice for this part. A 5 mΩ implementation supports the higher 16.2 A charge-current setting and 12.7 A OTG-current limit, whereas a 10 mΩ implementation halves the charge-current ceiling to 8.1 A and the stated OTG-current limit to 6.35 A. That distinction also changes current-programming resolution, so current capability and measurement granularity should be evaluated together rather than copied from the family headline.
The 3.5-to-26-V charger input range and the 3-to-24-V OTG range describe different operating paths. Likewise, the 400-kHz or 800-kHz switching choice affects the power-stage size/loss trade-off instead of changing the supported battery-cell count. I2C configuration and the integrated 8-bit ADC allow a host controller to manage operating limits and monitor voltage, current and power within the documented accuracy boundaries.
Lifecycle and Procurement
Texas Instruments lists BQ25730RSNR as Active. This exact orderable uses the WQFN-32 (RSN) 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.
