Texas Instruments BQ24770RUYR

Overview

BQ24770RUYR from Texas Instruments is a host-controlled, SMBus-interface NVDC (Narrow Voltage DC) battery charge controller for 1S–4S Li-ion/Li-polymer systems with 4.5–24 V input range. It integrates NMOS ACFET/RBFET drivers, PMOS BATFET gate driver, and synchronous buck regulator control, delivering ±0.5% charge voltage accuracy, ultra-fast 100 µs input current DPM, and 600 µA quiescent current - enabling system instant-on operation even with no or deeply discharged battery in ultrabooks and tablets.

For engineers reviewing the BQ24770RUYR datasheet, BQ24770RUYR pinout, BQ24770RUYR application, or BQ24770RUYR equivalent, key selection considerations include its SMBus-addressable 0x12H interface, WQFN-28 package with thermal pad, programmable 600 kHz–1.2 MHz switching frequency, integrated PROCHOT output for CPU throttling, and dual-path power path management supporting supplement mode with synchronous BATFET control.

Technical Context

The BQ24770RUYR implements a synchronous buck topology with independent high-side (HIDRV/PHASE/BTST) and low-side (LODRV) MOSFET drivers, enabling efficient charging across 1–4 cell configurations. Its NVDC architecture maintains regulated system voltage (programmable 1.024–19.2 V) independently of battery state, allowing seamless transition between adapter and battery power without system brownout.

It features three precision current-sense amplifiers: 40×/80× IADP for adapter current, 20× IBAT for charge current, and 8×/16× IBAT for discharge current - all with ±2% accuracy and clamped 3.3 V outputs. The device also embeds an independent comparator (CMPIN/CMPOUT), REGN 5.4 V LDO, and hardware-based PROCHOT assertion triggered by overcurrent, overvoltage, or thermal events.

Key Specifications

Pinout & Package

Package: WQFN-28 (RUY), 4.00 mm × 4.00 mm, exposed thermal pad - optimized for high-density notebook PCBs with low-profile height and enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charge controller applications.

Compared with BQ24773RUYR and BQ24780SRGER, the BQ24770RUYR provides the most cost-effective SMBus-based solution for standard ultrabook/tablet NVDC charging, balancing precision (±0.5% V_BAT), low quiescent current (600 µA), and proven interoperability with Intel platform power managers.

Availability

BQ24770RUYR is available at Aetrix Electronics and suitable for ultrabook power management, notebook battery charging, and industrial portable equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for BQ24770RUYR 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 ICs, with decades of expertise in battery charging and power conversion technologies.

The BQ24770RUYR belongs to TI's bq247xx NVDC charge controller product line, designed specifically for space-constrained, high-efficiency multi-cell Li-ion charging in portable computing platforms requiring host-controlled power path management and CPU thermal coordination.

FAQ

What communication interface does the BQ24770RUYR use?

The BQ24770RUYR uses a standard SMBus 2.0 interface with fixed slave address 0x12H (00010010b). It supports full read/write access to all configuration registers, telemetry data (IADP, IBAT, PMON), and status flags. Unlike the pin-compatible BQ24773RUYR, the BQ24770RUYR does not support I²C protocol - SMBus timing and packet structure must be strictly followed in host firmware.

How does the BQ24770RUYR handle system power when the battery is removed or fully discharged?

The BQ24770RUYR maintains regulated system voltage (SYS) using its NVDC architecture - it drives the external P-channel BATFET in linear mode to source current from the adapter directly to SYS, even with no battery present or at 0 V. This enables true instant-on operation and eliminates the need for backup capacitors, as confirmed in the functional description and power path management section of the BQ24770RUYR datasheet.

What is the purpose of the PROCHOT output on the BQ24770RUYR?

The PROCHOT pin on the BQ24770RUYR is an active-low open-drain output that asserts when any programmed condition is violated - including adapter overcurrent (IADP), battery discharge overcurrent (IBAT), or system undervoltage (V(SYS) < programmed minimum). It delivers a minimum 10-ms pulse directly to the CPU's PROCHOT# input to trigger immediate thermal or power throttling, as defined in Intel's mobile platform specifications.

Can the BQ24770RUYR support both charging and system power delivery simultaneously?

Yes, the BQ24770RUYR supports simultaneous charging and system power delivery via its integrated power path management. When the adapter is under heavy load, the device enables supplement mode by turning on the external BATFET to allow battery current to augment adapter current - preventing input overcurrent shutdown while sustaining system operation, as detailed in the "Supplement Mode with Synchronous BATFET Control" feature description.

What package type and thermal characteristics apply to the BQ24770RUYR?

The BQ24770RUYR is packaged in a 28-pin WQFN (RUY) with 4.00 mm × 4.00 mm body and exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 33.3 °C/W, and junction-to-board (RθJB) is 6.5 °C/W - confirming effective heat transfer through the thermal pad to inner PCB layers. This package enables compact layouts in ultrabooks while meeting 125°C max junction temperature under typical operating conditions.