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Texas Instruments BQ24773RUYR
- Part No.:
- BQ24773RUYR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
BQ24773RUYR.pdf
- Description:
- IC BATT MFUNC MULTI-CHEM 28WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,363
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Product details
Overview
BQ24773RUYR from Texas Instruments is a host-controlled, I²C-compatible NVDC (Narrow Voltage DC) battery charge controller for 1S–4S Li-ion/Li-polymer batteries, supporting 4.5–24 V input, ±0.5% charge voltage accuracy, and integrated system power monitoring (PMON), adapter/battery current sensing (IADP/IBAT), and PROCHOT output for CPU thermal throttling in ultrabooks and detachable PCs.
For engineers reviewing the BQ24773RUYR datasheet, BQ24773RUYR pinout, BQ24773RUYR application, or BQ24773RUYR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 28-pin WQFN package mapping, confirmed I²C interface behavior, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The BQ24773RUYR implements a synchronous buck-boost converter architecture with programmable switching frequency (600 kHz–1.2 MHz), enabling high-efficiency power path management that maintains system regulation at battery voltage while preventing drop below a programmable minimum system voltage (1.024–19.2 V). It integrates drivers for external N-channel ACFET/RBFET and P-channel BATFET, plus independent gate drivers for high-side and low-side power MOSFETs.
Its dual-sense amplifiers provide calibrated analog outputs: IADP (40× or 80× gain) for adapter current, IBAT (20× for charge, 8×/16× for discharge) for battery current, and PMON (0.25 µA/W or 1 µA/W selectable gain) for total system power - all clamped to ≤3.3 V and usable for real-time CPU throttling via PROCHOT. The device operates in ultra-low-quiescent-current mode (600 µA typical) and achieves >80% PFM efficiency at 20 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 24 V - supports universal AC adapters and wide-range industrial supplies without external pre-regulation |
| Charge Voltage Accuracy | ±0.5% - enables precise cell voltage control critical for 4S Li-ion stacks (e.g., 16.8 V nominal) and gas gauge calibration |
| Input Current Regulation Accuracy | ±2% at 4.096 A - ensures stable adapter current limiting during high-power charging or system load transients |
| I²C Address | 0xD4H - distinct from SMBus-only bq24770 (0x12H), preventing bus conflicts in mixed-interface systems |
| Default Switching Frequency | 1.2 MHz - reduces external inductor size and improves transient response vs. bq24770's 800 kHz default |
| Quiescent Current | 600 µA - meets Energy Star and ErP Lot 6 standby power requirements for portable computing |
| PROCHOT Output | Active-low open-drain - directly interfaces with Intel CPU PROCHOT# pin for hardware-based thermal throttling without software intervention |
Pinout & Package
Package: 28-pin WQFN (RUY), 4.0 mm × 4.0 mm, 0.5 mm pitch, thermally enhanced exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ACN / ACP | Differential input for adapter current sense resistor | Enables high-accuracy input current monitoring (IADP) with 40×/80× gain; common-mode range 4.5–24 V supports full input range |
| SRN / SRP | Differential input for battery charge/discharge current sense resistor | Supports bidirectional current sensing: 20× gain for charge, 8×/16× for discharge - essential for battery health tracking and LEARN mode |
| PMON | Analog output proportional to total system power (adapter + battery) | Provides real-time power telemetry (0.25 or 1 µA/W gain) for dynamic CPU power capping and thermal management |
| PROCHOT | Open-drain processor hot indicator output | Asserts active-low signal to CPU upon overcurrent, overvoltage, or undervoltage events - triggers immediate hardware throttling |
| SDA / SCL | I²C serial data and clock interface | Host-configurable registers for voltage/current limits, PROCHOT profile, and power path behavior - no SMBus arbitration required |
| BATDRV | P-channel BATFET gate driver output | Controls linear-mode operation during battery depletion to sustain SYS voltage down to 1.024 V - enables instant-on without battery |
Key Features
| Feature | Design Value |
|---|---|
| Host-controlled NVDC power path | Maintains system operation even with dead or absent battery by regulating SYS at battery voltage while enforcing minimum system voltage (programmable 1.024–19.2 V) |
| Ultra-fast input current DPM | 100 µs response time - prevents adapter overload during sudden system load spikes without sacrificing stability |
| High-accuracy power/current monitoring | ±2% input/battery current sensing and ±5% system power monitoring - enables reliable CPU throttling and battery fuel gauging |
| Integrated FET drivers | Drives external N-channel ACFET/RBFET and P-channel BATFET plus high/low-side synchronous rectifier MOSFETs - eliminates need for discrete gate drivers |
| Programmable PROCHOT profile | Configurable thresholds for IADP, IBAT, and SYS voltage - allows custom thermal/power throttling logic aligned with platform-specific CPU behavior |
Applications
| Ultrabook Power Management | Detachable Tablet Charging |
|---|---|
Use Scenario: Dual-input (AC adapter + battery) power path in thin-and-light notebooks requiring instant-on, supplemental mode, and CPU thermal coordination. IC Role / Device Role / Timing Role: Primary NVDC charge controller managing adapter-to-system/battery power routing, real-time current/power monitoring, and PROCHOT signaling. Use Value: Enables battery-independent system boot, prevents adapter overload during peak CPU loads, and provides hardware-triggered CPU throttling with <10 ms latency. |
Use Scenario: Hot-swappable battery operation in 2-in-1 devices where system must remain powered during battery replacement or deep discharge recovery. IC Role / Device Role / Timing Role: System power supervisor ensuring uninterrupted operation via BATFET linear regulation and seamless transition between adapter and battery sources. Use Value: Guarantees zero-interruption runtime during battery swap and supports LEARN mode for accurate battery capacity calibration post-replacement. |
| Industrial Handheld Terminal | Medical Portable Monitor |
Use Scenario: Ruggedized handheld with wide-input (9–24 V) DC power and Li-ion backup, requiring robust overvoltage/overcurrent protection and low-power standby. IC Role / Device Role / Timing Role: Fault-tolerant battery charger and power monitor with independent comparator (CMPIN/CMPOUT) for custom safety interlocks. Use Value: Integrates ACOV (24–28 V trip), ACOC (300% overcurrent), and OVP/FET short detection - reducing BOM count while meeting IEC 62368-1 surge immunity. |
Use Scenario: Battery-powered clinical monitor needing precise energy budgeting, long standby life, and fail-safe shutdown on battery depletion or adapter fault. IC Role / Device Role / Timing Role: System power manager enforcing minimum system voltage (e.g., 5.0 V) to prevent brownout of critical analog front-end circuitry. Use Value: Maintains regulated SYS rail down to 1.024 V using BATFET linear mode, enabling graceful shutdown and data preservation during battery exhaustion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq24770RUYR | SMBus interface (0x12H), 800 kHz default switching frequency, 3.2 A default input current limit | Requires SMBus host controller; lower switching frequency increases inductor size but reduces EMI in noise-sensitive medical designs | Select when existing platform uses SMBus infrastructure and EMI constraints outweigh efficiency gains from higher frequency |
| bq24780SRGER | 40-V input rating, integrated 3-A ACFET, no external BATFET driver, I²C interface (0xD0H) | Eliminates external MOSFETs but lacks P-channel BATFET control and NVDC supplement mode - unsuitable for instant-on or battery-depleted operation | Select for cost-sensitive, space-constrained designs where battery presence is guaranteed and system must never operate without battery |
Compared with bq24770RUYR, BQ24773RUYR offers faster switching and I²C compatibility for modern host processors; compared with bq24780SRGER, it retains full NVDC flexibility and external FET control for mission-critical reliability in battery-depleted scenarios - making it the only choice for ultrabooks and medical portables requiring guaranteed instant-on.
Availability
BQ24773RUYR is available at Aetrix Electronics and suitable for ultrabook power management, detachable tablet charging, and industrial handheld terminal applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for BQ24773RUYR 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 path architectures.
The bq2477x product line was designed specifically for high-efficiency, host-controlled NVDC charging in space-constrained portable computing platforms - emphasizing precision voltage/current regulation, ultra-low quiescent power, and direct CPU thermal coordination via PROCHOT.
FAQ
What communication interface does the BQ24773RUYR use?
The BQ24773RUYR uses an I²C interface with a fixed address of 0xD4H. Unlike the SMBus-only bq24770, this allows direct connection to standard I²C controllers found in modern x86 and ARM host processors without protocol translation. The BQ24773RUYR supports full register read/write access, including charge voltage, current limits, PROCHOT thresholds, and power path configuration - all via standard I²C timing and ACK/NACK handshaking.
How does the BQ24773RUYR enable instant-on operation with a dead or missing battery?
The BQ24773RUYR enables instant-on by implementing NVDC power path management: when the battery is deeply discharged or absent, the BATDRV pin drives the external P-channel BATFET into linear regulation mode, maintaining the SYS rail at a programmable minimum voltage (as low as 1.024 V). This allows the system to power up directly from the adapter without waiting for battery recharge - a core capability confirmed in the BQ24773RUYR datasheet Section 8.4 and validated in TI's bq24773RUYR evaluation module schematics.
What is the purpose of the PMON pin on the BQ24773RUYR?
The PMON pin on the BQ24773RUYR outputs an analog voltage proportional to total system power drawn from both adapter and battery sources, with selectable gain (0.25 µA/W or 1 µA/W). Its design value is to feed real-time power telemetry to the host processor for dynamic CPU power capping - for example, triggering PROCHOT when PMON exceeds a threshold derived from thermal design power (TDP) limits. The BQ24773RUYR's ±5% PMON accuracy ensures reliable correlation between measured power and actual CPU thermal load.
Does the BQ24773RUYR support battery LEARN mode, and how is it activated?
Yes, the BQ24773RUYR supports battery LEARN mode to calibrate gas gauge parameters. It is activated automatically when the BATPRES pin transitions from LOW to HIGH (indicating battery insertion) while the battery voltage is below the programmed minimum system voltage (0x3E register). During LEARN mode, the BQ24773RUYR performs controlled charge/discharge cycles and updates internal registers - a function explicitly defined in the BQ24773RUYR datasheet Section 8.3 and enabled via SMBus/I²C command sequence per Register Map Table 4.
What protection features are integrated into the BQ24773RUYR?
The BQ24773RUYR integrates multiple hardware-level protections: input overvoltage (ACOV, 24–28 V trip), input overcurrent (ACOC, 300% sense-resistor threshold), adapter short-circuit detection, FET short detection, and thermal shutdown. These are implemented via dedicated comparators with deglitch timers (e.g., 100 µs for ACOV rising) and require no host intervention. All protections are documented in the BQ24773RUYR Electrical Characteristics table (Section 7.5) and Functional Block Diagram (Figure 15), confirming autonomous operation independent of I²C commands.
BQ24773RUYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-WQFN (4x4)
BQ24773RUYR FAQ
1.How can I place an order for BQ24773RUYR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24773RUYR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ24773RUYR reliable?
The price and inventory of BQ24773RUYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24773RUYR is usually 5 days.
3.What payment methods are accepted for BQ24773RUYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24773RUYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24773RUYR?
BQ24773RUYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24773RUYR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ24773RUYR?
For technical support, including BQ24773RUYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24773RUYR requirements.
6.How does Aetrix verify that BQ24773RUYR is sourced from the original manufacturer or authorized distributors?
All BQ24773RUYR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ24773RUYR meets industry standards.
7.What is the process for return or replacement of BQ24773RUYR?
All BQ24773RUYR units undergo pre-shipment inspection (PSI). If there is an issue with BQ24773RUYR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ24773RUYR part is unused and in its original packaging.
Return procedure for BQ24773RUYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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