My Inquiry
My Account
Texas Instruments BQ7790509PWR
- Part No.:
- BQ7790509PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790509PWR.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,369
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ7790509PWR from Texas Instruments is a 3- to 5-series ultra-low-power lithium-ion battery protector IC implementing factory-programmed voltage, current, temperature, and open-wire protections without MCU control. It delivers ±10 mV overvoltage/undervoltage accuracy, 100 mV overcurrent discharge 2 threshold, 200 mV short-circuit discharge threshold, and supports stackable configurations up to 20-series cells for power tools and energy storage systems.
For engineers reviewing the BQ7790509PWR datasheet, BQ7790509PWR pinout, BQ7790509PWR application, or BQ7790509PWR equivalent, key selection considerations include its 5-cell support, 90-ms OCD2 delay, 700-ms SCD delay with load-removal+delay recovery, and TSSOP-20 package compatibility with PCB-level thermal management in high-reliability battery packs.
Technical Context
The BQ7790509PWR integrates independent low-side NMOS CHG and DSG FET drivers with programmable fault recovery logic, enabling cascaded stack architectures where upper-device CHGU/DSG outputs feed CTRC/CTRD pins of lower devices. Its analog front-end uses differential cell voltage sensing (VC1–VC5), bidirectional current sensing (SRP/SRN), and thermistor-based temperature monitoring (TS/VTB) with factory-trimmed thresholds.
It operates in NORMAL mode at 6 µA typical quiescent current and SHUTDOWN mode at ≤0.5 µA, with absolute maximum ratings including 36 V per cell input and 25 V VDD. Protection decisions are made autonomously using internal comparators and delay timers-no external microcontroller or firmware required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3-series to 5-series Li-ion/LiPo cells; scalable to ≥20-series via stacking |
| Overvoltage Threshold | 4250 mV ±10 mV - precise cell balancing trigger at full charge |
| Undervoltage Threshold | 2500 mV ±10 mV - prevents deep discharge damage in 5S packs |
| OCD2 Threshold & Delay | 100 mV, 90 ms - detects moderate overcurrent before thermal runaway |
| SCD Threshold & Delay | 200 mV, 700 ms - fast short-circuit isolation with load-removal+delay recovery |
| Normal Mode Current | 6 µA typical - enables multi-year operation on backup battery or low-leakage packs |
| Package | TSSOP-20 (6.50 mm × 4.40 mm) - surface-mount compatible with automated assembly |
Pinout & Package
TSSOP-20 package with 0.65 mm pitch; body size 6.50 mm × 4.40 mm; exposed thermal pad recommended for thermal dissipation in continuous discharge applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary supply rail (3–25 V); powers internal logic and drivers |
| VC1–VC5 | Cell voltage sense inputs | Differential inputs for 5-series configuration; VC5 connects to top cell anode |
| SRP / SRN | Current sense differential pair | Measures pack current direction and magnitude across sense resistor |
| CHG / DSG | Low-side FET gate drivers | Active-high outputs driving NMOS CHG/DSG FETs; 12 V typical drive level |
| CTRC / CTRD | Stack control inputs | Accept CHGU/DSG signals from upper device in cascade; enable inter-device coordination |
| TS / VTB | Thermistor interface | TS reads NTC voltage; VTB provides 3.0 V bias reference for temperature measurement |
| LD | Load removal detection | Monitors PACK– disconnect event; triggers recovery after fault clearance |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables ≥6S protection by cascading CHGU/DSG → CTRC/CTRD; no external logic needed |
| Factory-programmed protection | Fixed OV=4250 mV, UV=2500 mV, OCD2=100 mV, SCD=200 mV - eliminates calibration overhead |
| Independent CHG/DSG control | Allows selective disable of charge or discharge path during fault or maintenance |
| Open-wire detection | Identifies broken cell interconnects via VCx voltage drop; 500 mV threshold with 100 mV hysteresis |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration in automotive-grade battery modules |
Applications
| Power Tools | Energy Storage Systems |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs operating at 18–20 V (5S Li-ion) with frequent high-current pulses. IC Role / Device Role / Timing Role: Primary protector enforcing cell-level OV/UV limits and detecting 100-mV OCD2 faults within 90 ms to prevent FET overheating. Use Value: Enables compact, reliable 5S packs without MCU supervision while maintaining UL 1642 compliance. |
Use Scenario: Residential/home ESS modules requiring 36–48 V (10–13S) stacks built from standardized 5S sub-packs. IC Role / Device Role / Timing Role: Base-layer protector in stacked topology; upper-device CHGU/DSG drives lower-device CTRC/CTRD to coordinate multi-level shutdown. Use Value: Reduces BOM count vs. monolithic solutions and simplifies certification by reusing qualified 5S building blocks. |
| Light Electric Vehicles | Lead-Acid Replacement Packs |
|
Use Scenario: E-bike or e-scooter battery packs rated 36 V nominal (10S) with integrated thermal monitoring. IC Role / Device Role / Timing Role: Monitors TS/VTB for OTD=70°C/UTD=–20°C thresholds and disables DSG via internal timer upon violation. Use Value: Prevents thermal runaway during regenerative braking or hill-climbing loads without adding sensor signal conditioning circuitry. |
Use Scenario: 12 V–48 V drop-in PbA replacements for marine/RV applications needing robust open-wire detection. IC Role / Device Role / Timing Role: Detects broken intercell welds or connector failures via 4.5 s open-wire delay and latches fault until manual reset. Use Value: Eliminates field failures caused by undetected mechanical disconnections in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790508PWR | OV=3900 mV, UV=2000 mV, OCD2=100 mV, SCD=200 mV, OTD/OTC=70°C/50°C | Lower voltage thresholds suit LFP or aged Li-ion cells; same 90-ms OCD2 delay | Select for wider state-of-charge window or legacy cell chemistry compatibility |
| BQ7790512PWR | OV=4175 mV, UV=2800 mV, OCD2=150 mV, SCD=300 mV, UTC=0°C | Higher UV and SCD thresholds reduce nuisance trips in high-noise industrial environments | Select for ruggedized applications where false discharge cutoff must be minimized |
Compared with BQ7790509PWR, BQ7790508PWR offers lower protection thresholds for conservative cell management, while BQ7790512PWR raises UV and SCD trip points to improve noise immunity-both retain identical TSSOP-20 packaging and stack control interface for drop-in layout reuse.
Availability
BQ7790509PWR is available at Aetrix Electronics and suitable for power tools, light electric vehicles, and energy storage systems requiring stable component supply, long-term lifecycle support, and consistent factory-programmed protection behavior across production batches.
Supply support for BQ7790509PWR 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 battery management system expertise.
The BQ77905 family targets cost-sensitive, high-reliability lithium battery packs where autonomous, stackable protection replaces microcontroller-based solutions-designed specifically for power tools, ESS, and lead-acid replacement markets.
FAQ
What is the exact overvoltage and undervoltage threshold configuration of the BQ7790509PWR?
The BQ7790509PWR is factory-programmed with a 4250 mV overvoltage threshold and 2500 mV undervoltage threshold, both with ±10 mV accuracy at 25°C. These values are fixed and non-adjustable in-circuit; they correspond to the "BQ7790509" variant defined in TI's device comparison table and are verified in the Electrical Characteristics section of the SLUSCM3K datasheet.
Does the BQ7790509PWR support 5-cell (5S) battery configurations natively?
Yes, the BQ7790509PWR natively supports 3- to 5-series lithium-ion configurations without external components. Pin VC5 is actively used as the top-cell voltage sense input, and the CCFG pin is internally biased for 5S detection. This is confirmed in the Device Comparison table and Pin Functions section of the BQ77905 datasheet.
What are the OCD2 and SCD fault timing parameters for the BQ7790509PWR?
The BQ7790509PWR has a 100 mV overcurrent discharge 2 (OCD2) threshold with a 90 ms detection delay, and a 200 mV short-circuit discharge (SCD) threshold with a 700 ms delay. Both use "Load Removal + Delay" recovery, meaning the FETs remain off until load is removed and the delay expires-verified in Table 5-2 of the SLUSCM3K datasheet.
Can the BQ7790509PWR be used in stacked configurations beyond 5 cells?
Yes, the BQ7790509PWR supports stacking up to 20-series cells using its CHGU and DSG outputs to drive CTRC and CTRD inputs of lower devices. This cascaded architecture is explicitly documented in the Simplified Schematic and Detailed Description sections, and requires no additional logic or firmware.
What package type and thermal characteristics does the BQ7790509PWR have?
The BQ7790509PWR is supplied in a 20-pin TSSOP package (PW suffix) measuring 6.50 mm × 4.40 mm. Its junction-to-ambient thermal resistance (RθJA) is 98.4°C/W, and it features an exposed thermal pad for enhanced heat dissipation-critical for sustained discharge currents in power tool applications.
BQ7790509PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ7790509PWR FAQ
1.How can I place an order for BQ7790509PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790509PWR 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 BQ7790509PWR reliable?
The price and inventory of BQ7790509PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790509PWR is usually 5 days.
3.What payment methods are accepted for BQ7790509PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790509PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790509PWR?
BQ7790509PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790509PWR 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 BQ7790509PWR?
For technical support, including BQ7790509PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790509PWR requirements.
6.How does Aetrix verify that BQ7790509PWR is sourced from the original manufacturer or authorized distributors?
All BQ7790509PWR 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 BQ7790509PWR meets industry standards.
7.What is the process for return or replacement of BQ7790509PWR?
All BQ7790509PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790509PWR, 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 BQ7790509PWR part is unused and in its original packaging.
Return procedure for BQ7790509PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ7790509PWR Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
