Device Overview
BQ25792RQMR is a Texas Instruments integrated synchronous buck-boost battery charger for 1- to 4-series-cell Li-ion and Li-polymer systems. The device combines charging, NVDC power-path management, dual-input source selection, USB OTG operation, D+/D- source detection, I2C configuration, and an integrated ADC in a 29-pin VQFN-HR package.
Key Selection Information
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | BQ25792RQMR |
| Battery configuration | 1 to 4 series cells |
| Charge topology | Synchronous switch-mode buck-boost |
| Input operating range | 3.6 V to 24 V |
| Charge current | Up to 5 A, subject to operating and thermal limits |
| Programmable battery voltage | 3.0 V to 18.8 V |
| Switching frequency | 750 kHz or 1.5 MHz programmable |
| Control interface | I2C |
| Power-path features | NVDC system regulation, dual-input source selector, USB OTG |
| Monitoring | Integrated multi-channel ADC for voltage/current monitoring |
| Package | VQFN-HR (RQM), 29 pins, 4 mm x 4 mm |
| Operating temperature | -40 °C to +85 °C |
Engineering Selection Notes
The buck-boost architecture is the key reason to choose BQ25792 over a simpler buck-only charger. The converter can regulate charging and the system rail when the adapter voltage is above, near, or below battery voltage, which is especially useful for multi-cell packs and USB-C/PD-style input ranges.
The 5 A headline is not an unconditional system-output guarantee. TI specifies input-current limits, thermal regulation, inductor/FET current constraints, and power-path priority between SYS and BAT. Adapter capability, input current limit, inductor design, switching frequency, PCB thermal path, and battery charge current therefore have to be solved together.
NVDC power-path management keeps the system rail above a minimum level even with a deeply discharged battery, while I2C allows the host to change charge, input, OTG, and protection settings. D+/D- source detection can establish default input-current behavior for USB sources, but non-USB adapters can also be used with the appropriate input-current configuration.
For new designs, procurement status should be checked directly with TI. In a TI E2E support reply, TI states that BQ25792 was moved to custom status and recommends BQ25798 for new consideration. The BQ25792 datasheet remains the technical reference for existing designs and sourcing.
Official Engineering Resources
- BQ25792 datasheet PDF – TI E2E hosted attachment
- Texas Instruments BQ25792EVM resource -operating architecture, 1-4 cell use, 3.6-24 V input and evaluation guidance.
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.
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