Texas Instruments BQ25790YBGR

Overview

BQ25790YBGR from Texas Instruments is an I²C-controlled, synchronous buck-boost battery charger IC for 1–4 cell Li-ion/Li-polymer batteries, supporting up to 5-A charging current, 3.6–24-V input voltage range, and USB PD 3.0 OTG output (2.8–22 V). It integrates dual-input power mux, NVDC power path, and 16-bit ADC for voltage/current/temperature monitoring - deployed in smartphones, tablets, and portable drones.

For engineers reviewing the BQ25790YBGR datasheet, BQ25790YBGR pinout, BQ25790YBGR application, or BQ25790YBGR equivalent, key selection considerations include its 56-pin DSBGA package, programmable 750-kHz/1.5-MHz switching frequency, ±0.5% charge voltage accuracy for 2s battery, autonomous + I²C dual-mode operation, and integrated USB PD 3.0 PPS-compliant OTG output with 10-mV resolution.

Technical Context

The BQ25790YBGR implements a fully integrated four-MOSFET buck-boost topology with internal Q1–Q4 switches and BATFET, enabling seamless transition between buck, boost, and buck-boost modes based on real-time V_IN/V_BAT comparison - no host intervention required. Its dual-input selector supports independent VAC1/VAC2 detection and ACDRV-driven external FET control for legacy and USB PD adapters.

Narrow-VDC (NVDC) power path ensures system regulation at ~100 mV above battery voltage while maintaining operation during deep discharge or battery removal; USB OTG mode uses the same buck-boost core to generate programmable 2.8–22 V on VBUS with 10-mV steps and 3.32-A current limit, compliant with USB PD 3.0 Programmable Power Supply (PPS).

Key Specifications

Pinout & Package

Package: 56-pin DSBGA (WCSP), 2.9 mm × 3.3 mm, 0.4-mm pitch, bottom-side solder balls.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost battery charger applications.

Compared with BQ25792YBGR, BQ25790YBGR omits the auxiliary buck regulator - reducing BOM count and thermal load where 5-V rail is already available. Against BQ25710RGER, it adds dual-input arbitration, USB PD 3.0 PPS OTG, and higher 5-A charge capability - essential for premium portable devices demanding flexible sourcing and fast charging.

Availability

BQ25790YBGR is available at Aetrix Electronics and suitable for smartphone, tablet, and drone applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for BQ25790YBGR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery charging ICs and USB power delivery solutions.

The BQ25790YBGR belongs to TI's BQ257xx family of highly integrated buck-boost chargers designed for USB-C PD-enabled portable electronics - emphasizing minimal external components, high efficiency across wide Vin/Vbat ranges, and robust safety compliance.

FAQ

What is the maximum supported battery configuration for the BQ25790YBGR?

The BQ25790YBGR supports 1-cell to 4-cell Li-ion or Li-polymer battery packs, with charge voltage regulation range spanning 3 V to 18.8 V. Its internal compensation and MOSFET sizing are optimized for this full range, and the device automatically configures buck/boost/buck-boost topology based on real-time V_IN/V_BAT relationship - no manual reconfiguration is needed. The BQ25790YBGR achieves ±0.5% voltage accuracy specifically for 2s battery systems.

Does the BQ25790YBGR support USB Power Delivery 3.0 Programmable Power Supply (PPS)?

Yes, the BQ25790YBGR supports USB PD 3.0 PPS in OTG mode, generating a programmable 2.8–22 V output on the VBUS pin with 10-mV resolution and up to 3.32-A current limit. This capability is implemented using the same buck-boost core that handles charging, ensuring hardware-level compliance without external regulators. The BQ25790YBGR's I²C interface allows full PPS contract negotiation and dynamic voltage adjustment per USB PD specification.

How does the BQ25790YBGR manage power path when both input and battery are present?

The BQ25790YBGR implements Narrow-VDC (NVDC) power path management: the SYS rail is regulated slightly above battery voltage (e.g., 8.5 V for an 8.4-V 2s pack), enabling system operation even if the battery is deeply discharged or removed. When input power is insufficient, the battery supplements the load seamlessly. The BQ25790YBGR uses internal BATFET and feedback control to maintain SYS stability without requiring external OR-ing circuits or diodes.

What are the key differences between autonomous mode and I²C-controlled mode on the BQ25790YBGR?

In autonomous mode, the BQ25790YBGR boots and executes full CC/CV charging using default settings configured via the PROG pin resistor - no host processor or firmware required. In I²C mode, the host fully controls all parameters (charge voltage/current, timers, OTG output, input selection) via 119 registers. The BQ25790YBGR supports hybrid use: autonomous start-up with later I²C takeover for runtime optimization - ideal for low-power or fail-safe applications.

What thermal protection mechanisms are built into the BQ25790YBGR?

The BQ25790YBGR includes junction temperature monitoring with programmable thermal regulation threshold (default 120°C), automatic thermal shutdown at 150°C, and converter current foldback to reduce power dissipation before shutdown. It also features thermal metrics including R_θJA = 46.1°C/W and R_θJB = 9.5°C/W for DSBGA package, enabling accurate PCB thermal design. All protections - including input/battery OVP/OCP and MOSFET OCP - are hardware-based and operate independently of I²C or firmware.