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Texas Instruments BQ24703PW
- Part No.:
- BQ24703PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ24703PW.pdf
- Description:
- IC BATT CNTRL MULTI-CHEM 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:509
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Product details
Overview
BQ24703PW from Texas Instruments is a multicell lithium-ion battery charger controller and system power selector IC for notebook/sub-notebook PCs. It integrates dynamic power management (DPM), 300-kHz PWM buck regulation, ±0.4% charge voltage accuracy, ±4% charge current accuracy, and zero-volt charging capability. It operates with 7–28 V supply and supports dual-source selection between AC adapter and battery.
For engineers reviewing the BQ24703PW datasheet, BQ24703PW pinout, BQ24703PW application, or BQ24703PW equivalent, key selection criteria include its DPM-enabled adaptive charge current control, precision 1.196-V battery voltage reference, integrated gate drivers (ACDRV/BATDRV), and TSSOP-24 package compatibility with high-density portable power designs.
Technical Context
The BQ24703PW implements a fixed-frequency (300 kHz) PWM controller with type-II compensation on COMP, enabling high-efficiency synchronous buck regulation for Li-ion charging. Its DPM architecture dynamically adjusts battery charge current based on real-time adapter current (via ACP/ACN) and system load (VS), ensuring total input current never exceeds adapter capability.
It features three independent error amplifiers - for battery voltage (BATP/BATSET), battery current (SRP/SRN/SRSET), and adapter current (ACP/ACN/ACSET) - each with 75–135 mA/V transconductance gain and ≥90 dB CMRR. Selector logic enforces break-before-make transitions using VS feedback to prevent shoot-through during source switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 7–28 V - supports wide-input wall adapters and ensures operation across varying AC input conditions. |
| Battery Voltage Accuracy | ±0.4% - enables precise Li-ion cell regulation at 4.2 V per cell without external trimming. |
| Charge Current Accuracy | ±4% - guarantees reliable current limiting for safe fast-charging in portable systems. |
| PWM Frequency | 300 kHz (±10%) - balances efficiency and EMI while allowing compact magnetics in space-constrained notebooks. |
| Quiescent Current | 22–28 μA in sleep mode - minimizes battery drain during AC-off standby. |
| Reference Voltage (VREF) | 5.000 V ±0.37 mV/V line regulation - provides stable, low-noise reference for DAC-based programming of SRSET/ACSET. |
| Zero-Volt Charging | Supported via SRP terminal - allows charging deeply depleted Li-ion cells down to 0 V without external circuitry. |
Pinout & Package
Package: 24-pin TSSOP (PW), 0.65 mm pitch, body size 7.8 × 4.4 mm, thermal pad not present. Designed for reflow-compatible assembly and high-power dissipation (θJA = 68.23°C/W @ 500 LFM on high-K board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ACDET | Adapter presence detection input | Monitors AC adapter insertion via resistor divider; triggers sleep mode when <1.246 V. |
| 2 ACPRES | Open-drain AC presence indicator | Drives pull-up to signal valid AC input; used by host to manage system power state. |
| 3 ACSEL | Manual source select control | Logic-high selects AC power; logic-low selects battery; enables manual override of auto-selection. |
| 4 BATDEP | Depleted battery threshold input | Sets ALARM trip point (e.g., 3.0 V battery = 1.246 V at pin); enables battery protection below cutoff. |
| 5 SRSET | Battery charge current programming | Voltage input (0–2.5 V) sets full-scale charge current via internal 25 V/V gain amplifier. |
| 6 ACSET | Adapter current limit programming | Voltage input (0–2.5 V) defines DPM activation threshold for dynamic current redistribution. |
| 7 VREF | Precision 5-V reference output | Stable, bypassed reference for external DACs or resistor dividers; ±0.3% tolerance over temp. |
| 8 ENABLE | Charging enable/disable control | High enables PWM and charging; low forces PWM high and disables battery charge path. |
| 9 BATSET | External battery voltage reference override | Input >0.25 V replaces internal 1.196-V reference; allows programmable charge voltage (e.g., 4.35 V). |
| 10 COMP | PWM comparator inverting input | Node for type-II compensation network; integrates error amplifier outputs to stabilize buck loop. |
| 11 ACN | Negative adapter current sense | Differential input for AC current sensing; used with ACP to measure adapter input current. |
| 12 ACP | Positive adapter current sense | Differential input referenced to ACN; enables accurate adapter current monitoring for DPM. |
| 13 ACDRV | AC source gate driver output | Drives external P-MOSFET high-side switch; VHSP-referenced for efficient gate turn-on. |
| 14 BATDRV | Battery source gate driver output | Drives external P-MOSFET for battery path; low = battery selected, high = disabled. |
| 15 VCC | Main supply input | Power rail for internal circuitry and gate drivers; requires local 10-μF ceramic + bulk capacitance. |
| 16 PWM | Buck converter gate drive output | Drives high-side P-MOSFET gate; swing from VHSP to VCC; supports synchronous rectification. |
| 17 VHSP | High-side gate drive supply | Internally regulated ~10 V below VCC (>10.5 V) or VCC–0.5 V (<10.5 V); requires 1-μF ceramic cap. |
| 18 ALARM | Open-drain depleted battery alarm | Asserts low when BATDEP <1.246 V or selector mismatch occurs; signals host to initiate shutdown. |
| 19 VS | System load voltage monitor | Enables break-before-make transition by comparing system voltage to BATP; prevents overvoltage. |
| 20 GND | Analog/digital ground reference | Common return for all analog and digital circuits; must be low-impedance and star-connected. |
| 21 SRP | Positive battery current sense | High-side current sense input; supports zero-volt charging and bidirectional current measurement. |
| 22 SRN | Negative battery current sense | Differential partner to SRP; connects to battery negative terminal for accurate ΔV sensing. |
| 23 IBAT | Battery current readback output | Analog voltage proportional to (SRP–SRN); 20 V/V gain; interfaces directly to ADC for fuel gauging. |
| 24 BATP | Battery voltage regulation input | Connects to battery divider; regulated to internal 1.196-V reference for precise 4.2-V/cell charging. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Power Management (DPM) | Automatically reduces battery charge current when total system + battery load exceeds adapter capability - eliminates need for oversized adapters. |
| Integrated Selector Logic with Break-Before-Make | Uses VS feedback to ensure AC and battery paths never conduct simultaneously - prevents MOSFET shoot-through and system instability. |
| Zero-Volt Charging Support | Allows charging of fully discharged Li-ion cells (0 V) via SRP terminal - extends usable battery life and avoids deep discharge damage. |
| ±0.4% Battery Voltage Regulation | Meets JEITA and IEC 62133 requirements for Li-ion charging accuracy - eliminates need for external calibration or trimming. |
| 20-μA Sleep Mode Current | Minimizes parasitic drain on battery during AC-off periods - critical for long-term storage and standby in portable devices. |
| 300-kHz Integrated PWM Controller | Reduces external component count vs discrete controllers - simplifies layout and improves EMI performance in tight PCB spaces. |
Applications
| Ultra-Thin Notebook PC | Convertible Tablet |
|---|---|
|
Use Scenario: Dual-source power management in fanless 12–14″ notebooks with limited thermal headroom and strict battery runtime targets. IC Role / Device Role / Timing Role: Primary battery charger controller and system power selector; manages buck regulation, DPM, and automatic AC/battery handoff. Use Value: Enables use of lower-cost 65-W adapters instead of 90-W units while maintaining full system performance and minimizing charge time. |
Use Scenario: Hybrid tablet-laptop with detachable keyboard and variable system load profiles (CPU-intensive vs display-only). IC Role / Device Role / Timing Role: Adaptive power router that prioritizes system load over charging when adapter current is constrained. Use Value: Prevents unexpected shutdown during AC-to-battery transition by enforcing break-before-make and monitoring VS vs BATP. |
| Enterprise Docking Station | Medical Portable Monitor |
|
Use Scenario: Multi-port docking station supplying power to laptop + peripherals while simultaneously charging the host battery. IC Role / Device Role / Timing Role: Centralized power manager coordinating adapter current allocation across system, battery, and USB-C PD ports. Use Value: Uses ACSET/SRSET programming to allocate exact current budgets - avoids overloading upstream AC source or violating USB-PD limits. |
Use Scenario: Battery-powered clinical monitor requiring FDA-compliant charge accuracy, low sleep current, and fail-safe depleted battery signaling. IC Role / Device Role / Timing Role: Safety-critical battery controller with ALARM-driven shutdown, ±0.4% voltage regulation, and 22-μA sleep current. Use Value: Meets IEC 62304 Class C software safety requirements via hardware-enforced voltage/current limits and deterministic alarm behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24702PW | Same pinout and core functionality, but lacks no-battery detection (VNOBAT) and uses different ALARM assertion logic on selector mismatch. | Supports basic AC/battery selection but not autonomous no-battery fallback; less suitable for hot-swap battery systems. | Select BQ24702PW only if ALARM behavior matching bq24703 is not required and cost is primary constraint. |
| BQ24780SRTWR | QFN-32, adds SMBus interface, integrated ADC, and enhanced telemetry (voltage/current/temp); higher integration but larger footprint. | Targets next-gen platforms needing firmware-configurable charge profiles and real-time battery diagnostics. | Choose BQ24780SRTWR when SMBus control, telemetry logging, or smaller solution size (no external DAC needed) is required. |
Compared with BQ24702PW, the BQ24703PW adds robust no-battery detection and stricter ALARM timing; compared with BQ24780SRTWR, it offers lower BOM cost and simpler analog configuration at the expense of digital configurability and telemetry.
Availability
BQ24703PW is available at Aetrix Electronics and suitable for ultra-thin notebook PCs, convertible tablets, enterprise docking stations, and medical portable monitors requiring stable component supply, long-lifecycle support, and TI-qualified automotive-grade reliability.
Supply support for BQ24703PW 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 over 50 years of innovation in power conversion and battery systems.
The BQ24703PW belongs to TI's battery management IC portfolio, designed specifically for high-efficiency, multi-chemistry charging and intelligent power routing in space-constrained portable computing platforms.
FAQ
What is the maximum operating junction temperature for the BQ24703PW?
The BQ24703PW has a specified virtual junction temperature range of –40°C to +125°C. Its thermal design supports up to 1.4 W maximum power dissipation on a high-K PCB at 500 LFM airflow (θJA = 68.23°C/W). For continuous operation at full load, PCB layout must include adequate copper pour and thermal vias under the exposed pad area - though note the PW package lacks an exposed thermal pad.
Does the BQ24703PW support charging of lithium-iron-phosphate (LiFePO₄) batteries?
Yes, the BQ24703PW supports LiFePO₄ charging via the BATSET pin: applying 1.25 V to BATSET configures the battery voltage regulation to ~3.6 V (1.25 V × 2.88 gain), matching typical LiFePO₄ full-charge thresholds. The ±0.4% accuracy and zero-volt charging capability remain fully functional for this chemistry.
How does the BQ24703PW implement break-before-make during AC-to-battery switchover?
The BQ24703PW uses the VS pin to monitor system voltage relative to BATP. When VS exceeds BATP during AC removal, the IC delays BATDRV activation until VS drops below BATP - ensuring the battery path is not enabled until AC is fully disconnected. This hardware-enforced timing prevents cross-conduction and maintains system stability without firmware intervention.
Can the BQ24703PW operate without the VREF pin connected?
No - the VREF pin must be bypassed with a minimum 2.2-μF ceramic capacitor (recommended 10 μF) to stabilize the internal 5-V reference. Omitting this capacitor causes reference noise, leading to inaccurate SRSET/ACSET scaling and unstable PWM regulation. The BQ24703PW will not function reliably in charging or DPM modes without proper VREF decoupling.
What is the purpose of the VHSP pin, and how should it be decoupled?
The VHSP pin supplies the gate drive voltage for external P-MOSFETs (ACDRV/BATDRV/PWM). It is internally regulated to ~10 V below VCC (for VCC >10.5 V) or VCC–0.5 V (for lower VCC). A 1-μF X7R ceramic capacitor must be placed within 5 mm of the pin; additionally, a 13-V Zener diode between VCC and VHSP is mandatory to clamp inrush stress during startup and prevent MOSFET gate oxide damage.
BQ24703PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
BQ24703PW FAQ
1.How can I place an order for BQ24703PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ24703PW 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 BQ24703PW reliable?
The price and inventory of BQ24703PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ24703PW is usually 5 days.
3.What payment methods are accepted for BQ24703PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ24703PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ24703PW?
BQ24703PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ24703PW 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 BQ24703PW?
For technical support, including BQ24703PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ24703PW requirements.
6.How does Aetrix verify that BQ24703PW is sourced from the original manufacturer or authorized distributors?
All BQ24703PW 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 BQ24703PW meets industry standards.
7.What is the process for return or replacement of BQ24703PW?
All BQ24703PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ24703PW, 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 BQ24703PW part is unused and in its original packaging.
Return procedure for BQ24703PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ24703PW Tags
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