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Texas Instruments BQ7790500PW
- Part No.:
- BQ7790500PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790500PW.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
BQ7790500PW from Texas Instruments is a 3- to 5-series ultra-low-power lithium-ion battery protector IC implementing voltage, current, temperature, and open-wire protection without MCU control. It features ±10 mV overvoltage/undervoltage accuracy, 6 µA normal-mode quiescent current, and factory-programmed thresholds including 4.200 V OV (0.5 s delay), 2.600 V UV (1 s delay), and 70°C/50°C overtemperature discharge/charge thresholds - deployed in power tools, light EVs, and 10.8–72-V energy storage systems.
For engineers reviewing the BQ7790500PW datasheet, BQ7790500PW pinout, BQ7790500PW application, or BQ7790500PW equivalent, this page delivers verified technical context, exact pin functions for TSSOP-20 stackable configuration, real-world protection timing values, and two validated alternative parts with documented functional differences for Li-ion pack design.
Technical Context
The BQ7790500PW implements independent low-side NMOS CHG and DSG FET drivers with programmable fault recovery (load removal + delay), enabling scalable cascaded protection up to 20-series cells. Its stackable interface uses CTRC/CTRD pins to propagate CHG/DSG control signals between devices in multi-chip configurations.
Protection logic relies on factory-programmed thresholds with fixed delays: OV at 4.200 V (0.5 s), UV at 2.600 V (1 s), OCD1 at –30 mV (1420 ms), OCD2 at 50 mV (700 ms), SCD at 120 mV (1 s), OTD at 70°C, OTC at 50°C, UTD at –20°C, and UTC at 0°C - all referenced to VTB bias output and calibrated for 103AT NTC thermistor networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3–5 series Li-ion cells; supports ≥6-series via stacking with up to 4 devices |
| Normal Mode Current | 6 µA - enables multi-year battery pack shelf life without compromising protection responsiveness |
| Overvoltage Threshold | 4.200 V ±10 mV (0.5 s delay) - matches common Li-ion CV charge termination while preventing cell stress |
| Undervoltage Threshold | 2.600 V ±18 mV (1 s delay) - prevents deep discharge damage to NMC/LCO chemistries |
| OCD2 Detection | 50 mV (700 ms delay) - detects sustained moderate overcurrent before thermal runaway onset |
| OTD / OTC Thresholds | 70°C / 50°C - dual independent temperature limits prevent unsafe charging/discharging under thermal stress |
| Open-Wire Detection | 500 mV threshold with 100 mV hysteresis - identifies broken interconnects between adjacent cells |
Pinout & Package
Package: 20-pin TSSOP (PW), 6.50 mm × 4.40 mm body size, JEDEC MO-153 compliant, RθJA = 98.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | 3–25 V main supply; powers internal regulators and logic; POR at 4 V, shutdown at ≤3.25 V |
| VC1–VC5 (Pins 3–7) | Cell voltage sense inputs | Monitor individual cell voltages; VC5 must connect to VC4 on BQ77904 but not required on BQ7790500PW |
| SRP / SRN (Pins 9–10) | Current sense differential inputs | Measure (VSRP – VSRN) for OCD1/OCD2/SCD detection; ±340 mV full-scale range |
| CHG / DSG (Pins 13, 11) | Low-side NMOS FET drivers | Drive external CHG/DSG FET gates; 12 V typical on-voltage, 16 Ω DSG off-resistance |
| CTRC / CTRD (Pins 18–19) | Stack control inputs | Accept CHG/DSG signals from upper device in cascade; deglitched with 7 ms filter |
| TS / VTB (Pins 15, 16) | Thermistor interface | TS accepts 103AT NTC; VTB provides 3.0 V bias reference for temperature ratio-based thresholds |
| LD (Pin 14) | Load removal detection | Detects PACK– disconnection during operation; 1.3 V threshold with 1.5 ms deglitch |
Key Features
| Feature | Design Value |
|---|---|
| Scalable stackable architecture | Enables 3–20 series cell protection using up to four BQ7790500PW devices without external logic |
| Independent CHG/DSG FET control | Allows selective disable of charge or discharge paths - critical for balancing-aware pack management |
| Factory-programmed protection setpoints | Eliminates external component tuning; BQ7790500PW configured for 4.200 V OV, 2.600 V UV, 70°C OTD, 0°C UTC |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and diagnostic coverage guidance for ISO 26262 ASIL-B systems |
| Ultra-low shutdown current | ≤0.5 µA shutdown mode extends shelf life in long-idle applications like UPS or emergency lighting |
Applications
| Power Tools | Light Electric Vehicles |
|---|---|
|
Use Scenario: Cordless drill/driver packs operating at 18–36 V with high pulse discharge currents (>30 A). IC Role / Device Role / Timing Role: Primary protector detecting 50 mV OCD2 faults within 700 ms and disabling DSG FET to prevent MOSFET thermal failure. Use Value: Prevents field failures from motor stall events while maintaining <6 µA self-discharge during storage. |
Use Scenario: 48-V e-bike or scooter battery packs subject to regenerative braking and ambient temperatures from –20°C to 70°C. IC Role / Device Role / Timing Role: Enforces dual-temperature limits: blocks charging below 0°C (UTC) and discharging above 70°C (OTD) using VTB-referenced NTC ratios. Use Value: Eliminates need for external microcontroller-based thermal arbitration, reducing BOM cost and firmware complexity. |
| Energy Storage Systems | Lead-Acid Replacement Packs |
|
Use Scenario: Residential 48-V LiFePO₄ backup systems requiring >10-year calendar life and undervoltage lockout at 2.6 V/cell. IC Role / Device Role / Timing Role: Applies 2.600 V UV threshold with 1 s delay and 400 mV hysteresis to avoid nuisance trips during transient load spikes. Use Value: Extends usable depth-of-discharge while guaranteeing cell longevity through precise, drift-compensated voltage monitoring. |
Use Scenario: 12–24 V drop-in replacements for automotive starter batteries, supporting cold-cranking pulses and alternator charging profiles. IC Role / Device Role / Timing Role: Uses open-wire detection (500 mV threshold) to identify failed cell interconnects before cranking attempts cause arcing or voltage collapse. Use Value: Enables safe, maintenance-free replacement of lead-acid with Li-ion by catching mechanical connection faults pre-deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790503PW | UV = 2.700 V (2 s delay), OCD2 = 160 mV (350 ms), UTC = –5°C | Better suited for higher-temperature chemistries requiring wider UV hysteresis and colder charge enablement | Select when pack operates in sub-zero environments and requires earlier charge enablement than BQ7790500PW's 0°C UTC |
| BQ7790400PW | Supports only 3–4 series cells; OV = 4.225 V (2 s), UV = 2.200 V (2 s), no 5-cell CCFG configuration | Limited to smaller packs; lacks BQ7790500PW's 5-cell scalability and tighter OV timing | Choose only for cost-sensitive 3S/4S applications where 5S capability and 0.5 s OV response are unnecessary |
Compared with BQ7790500PW, BQ7790503PW offers lower UV trip point and colder UTC threshold for wider operational envelope, while BQ7790400PW sacrifices 5S support and fast OV response for reduced feature count - making BQ7790500PW optimal for balanced 3–5S power tool and light EV designs.
Availability
BQ7790500PW is available at Aetrix Electronics and suitable for power tools, light electric vehicles, and energy storage systems requiring stable component supply, long-term lifecycle assurance, and TI-qualified functional safety documentation.
Supply support for BQ7790500PW 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 battery management solutions.
The BQ7790500PW belongs to TI's BQ779xx family of standalone Li-ion protectors designed for cost-sensitive, high-reliability battery packs where MCU-less protection and stackable scalability are essential.
FAQ
What is the maximum supported cell count for BQ7790500PW in a single-device configuration?
The BQ7790500PW supports 3- to 5-series lithium-ion cells directly in a single-device configuration. Its CCFG pin detects 5-cell topology via floating high-Z bias (25–45% of AVDD), distinguishing it from 3S/4S variants like BQ7790400PW. For >5S stacks, up to four BQ7790500PW devices can be cascaded using CTRC/CTRD control lines to protect up to 20-series packs without external logic.
Does BQ7790500PW require external passive components for basic protection functionality?
No, BQ7790500PW operates as a fully standalone protector with factory-programmed thresholds and internal delay timers. External components are only needed for specific functions: a 10-kΩ resistor between VTB and TS for thermistor biasing, ceramic capacitors on VDD/AVDD for decoupling, and an NTC thermistor on TS–AVSS for temperature sensing. No resistive dividers or timing capacitors are required for voltage/current protection.
How does BQ7790500PW handle overtemperature charge (OTC) and undertemperature charge (UTC) protection?
BQ7790500PW implements independent OTC and UTC thresholds referenced to VTB voltage: OTC triggers at 50°C (ratio ~29.38% VTB) and UTC at 0°C (ratio ~73.18% VTB). Both use fixed 4.5 s detection delays and recover only after temperature returns to safe range plus hysteresis - ensuring charge is blocked outside specified thermal windows without software intervention.
What is the purpose of the LD (Load Detection) pin on BQ7790500PW?
The LD pin on BQ7790500PW detects accidental disconnection of the PACK– terminal during operation. When voltage at LD falls below 1.3 V (with 1.5 ms deglitch), the device interprets this as load removal and disables both CHG and DSG FETs to prevent uncontrolled voltage transients. This protects against arcing and controller instability when battery leads are hot-plugged or disconnected mid-use.
Can BQ7790500PW be used in lead-acid replacement applications?
Yes, BQ7790500PW is explicitly qualified for lead-acid (PbA) replacement batteries per TI documentation. Its 3–5S scalability covers 12–24 V nominal ranges, open-wire detection prevents interconnect failure in vibration-prone automotive environments, and 70°C OTD/0°C UTC thresholds align with PbA replacement thermal requirements - enabling direct drop-in Li-ion upgrades with enhanced safety and cycle life.
BQ7790500PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 3 ~ 5
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ7790500PW FAQ
1.How can I place an order for BQ7790500PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790500PW 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 BQ7790500PW reliable?
The price and inventory of BQ7790500PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790500PW is usually 5 days.
3.What payment methods are accepted for BQ7790500PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790500PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790500PW?
BQ7790500PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790500PW 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 BQ7790500PW?
For technical support, including BQ7790500PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790500PW requirements.
6.How does Aetrix verify that BQ7790500PW is sourced from the original manufacturer or authorized distributors?
All BQ7790500PW 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 BQ7790500PW meets industry standards.
7.What is the process for return or replacement of BQ7790500PW?
All BQ7790500PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790500PW, 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 BQ7790500PW part is unused and in its original packaging.
Return procedure for BQ7790500PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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