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Texas Instruments BQ7790505PW
- Part No.:
- BQ7790505PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ7790505PW.pdf
- Description:
- IC BATT PROT LI-ION 3-5C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,509
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Product details
Overview
BQ7790505PW from Texas Instruments is a 3- to 5-series ultra-low-power lithium-ion battery protector IC implementing integrated voltage, current, temperature, and open-wire protection without MCU control. It delivers ±10 mV overvoltage/undervoltage accuracy, 6 µA normal-mode quiescent current, and factory-programmed thresholds for OV (4250 mV), UV (2700 mV), OCD2 (60 mV), and SCD (100 mV) with 1 s and 9 s recovery options - deployed in power tools, light EVs, and 10.8–72 V battery packs.
For engineers reviewing the BQ7790505PW datasheet, BQ7790505PW pinout, BQ7790505PW application, or BQ7790505PW equivalent, key selection considerations include its TSSOP-20 package, stackable architecture supporting ≥6-series configurations via CHGU/CTRC cascading, independent CHG/DSG low-side NMOS drivers, and functional safety documentation support for ISO 26262-compliant systems.
Technical Context
The BQ7790505PW operates as a primary hardware-based protector in multi-cell Li-ion battery packs, using dedicated analog comparators and internal delay timers to autonomously trigger CHG/DSG FET shutdown upon fault detection. Its CCFG pin configures cell count (3–5 series), while CHGU and CTRC enable hierarchical stacking by routing upper-device FET control signals to lower-device override inputs.
Protection logic integrates independent charge/discharge temperature thresholds (OTC/UTC = 45°C/0°C; OTD/UTD = 65°C/–20°C), open-wire detection with 450–550 mV per-cell threshold, and dual-stage overcurrent sensing (OCD1/OCD2) with ±20% accuracy ≤20 mV. All thresholds are factory-programmed; no external configuration registers or firmware are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3 to 5 series cells - fixed configuration set by CCFG pin voltage ratio (0–100% AVDD); enables direct use in 10.8–21.6 V nominal packs. |
| Normal Mode Current | 6 µA typical - enables >1-year shelf life in battery packs with minimal self-discharge impact on state-of-charge retention. |
| Overvoltage Threshold | 4250 mV ±10 mV - factory-programmed for precise cell balancing margin control; supports Li-ion chemistry with 4.2 V/cell nominal. |
| Undervoltage Threshold | 2700 mV ±18 mV - prevents deep discharge damage to NMC/LiPo cells; hysteresis configurable up to 200 mV. |
| OCD2 Detection | 60 mV threshold, 5 ms delay - detects moderate overloads (e.g., motor startup surges) before triggering hard short-circuit shutdown. |
| SCD Threshold | 100 mV, 9 µs response - triggers within 10 µs of short-circuit event at sense resistor; supports <100 A peak fault current interruption. |
| Operating Temperature | –40°C to +85°C - validated across full range for industrial-grade reliability in power tools and E-bikes. |
Pinout & Package
Package: 20-pin TSSOP (PW), 6.50 mm × 4.40 mm body size, 0.65 mm pitch. RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | Accepts 3–25 V; powers internal regulators and logic; POR threshold at 4 V ensures reliable startup after pack insertion. |
| VC1–VC5 (Pins 3–7) | Cell voltage sense inputs | VC1–VC5 monitor individual cell voltages; VC5 must be tied to VC4 on BQ77904 but remains active on BQ7790505PW for 5-cell support. |
| SRP/SRN (Pins 9–10) | Current sense differential inputs | Measure (VSRP – VSRN) across external sense resistor; enable OCD1/OCD2/SCD detection with ±20% accuracy at ≤20 mV. |
| CHG (Pin 13) | Charge FET driver output | Drives low-side NMOS gate; 12 V typical on-state voltage at VDD ≥12 V; 0.5 kΩ off-resistance prevents leakage during shutdown. |
| DSG (Pin 11) | Discharge FET driver output | Independent DSG driver with 16 Ω typical off-resistance; rise time <75 µs ensures fast fault isolation during short-circuit events. |
| CHGU (Pin 12) | Charge-up signal output | Propagates CHG command to CTRC of lower device in stacked configuration; enables scalable protection for ≥6-series packs. |
| CTRC/CTRD (Pins 18–19) | FET override control inputs | Accept stacked CHGU signal (CTRC) or host disable command (CTRD); deglitched with 7 ms filter to reject noise-induced false triggers. |
| TS/VTB (Pins 15–16) | Thermistor interface | TS reads NTC voltage; VTB supplies 3 V bias; supports OTC/UTC/OTD/UTD thresholds via 10-kΩ pull-up and 103AT thermistor network. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable architecture | Enables up to 20-series cell protection using ≤4 devices; eliminates need for external arbitration logic or daisy-chain communication. |
| Independent CHG/DSG drivers | Allows separate control of charge and discharge paths - critical for applications requiring discharge-only cutoff during overtemperature. |
| Factory-programmed protection | No external resistors or configuration pins needed; all thresholds and delays (e.g., 4250 mV OV, 60 mV OCD2, 5 ms delay) are laser-trimmed at wafer test. |
| Open-wire detection | Detects broken interconnects between adjacent cells using 450–550 mV per-cell voltage drop; prevents false undervoltage trips in damaged packs. |
| Functional safety support | Includes FIT rate data, failure mode analysis, and diagnostic coverage documentation aligned with ISO 26262 ASIL-B requirements. |
Applications
| Power Tools | Light Electric Vehicles |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs subject to high pulse currents (>30 A), mechanical vibration, and rapid temperature swings. IC Role / Device Role / Timing Role: Primary hardware protector executing autonomous OV/UV/OCD2/SCD decisions in <100 µs; disables DSG FET on short circuit while retaining CHG path for safe charging. Use Value: Prevents MOSFET thermal runaway during stall conditions; extends pack lifetime by avoiding repeated deep discharge cycles. |
Use Scenario: 36–48 V e-scooter or e-bike battery modules operating in ambient temperatures from –10°C to +55°C. IC Role / Device Role / Timing Role: Dual-temperature threshold enforcement (OTD = 65°C, UTC = 0°C) with independent charge/discharge logic; disables CHG below 0°C while permitting discharge down to –20°C. Use Value: Enables safe low-temperature operation without compromising charge safety - critical for urban micromobility in cold climates. |
| Energy Storage Systems | Start-Stop Automotive Batteries |
|
Use Scenario: Residential 48 V LiFePO₄ or NMC battery banks with 10+ year service life expectations and remote monitoring. IC Role / Device Role / Timing Role: Low-power protector (6 µA normal mode) minimizing standby drain; open-wire detection identifies degraded cell interconnects before capacity loss becomes irreversible. Use Value: Reduces annual self-discharge by >95% vs. microcontroller-based solutions; enables predictive maintenance via fault logging. |
Use Scenario: 12 V stop-start lead-acid replacement packs used in automotive engine cranking and accessory power. IC Role / Device Role / Timing Role: High-reliability protector with 0.5 µA shutdown current and 36 V absolute max rating per cell input - withstands load dump transients up to 35 V. Use Value: Eliminates need for external TVS clamping; sustains operation through ISO 7637-2 Pulse 5a transients without latch-up or reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ7790503PW | Same 5-cell support, but UV = 2700 mV with 2 s delay and load-removal recovery enabled; OCD2 = 80 mV, 350 ms delay. | Better suited for applications requiring graceful recovery after transient overloads (e.g., power tool intermittent use). | Select BQ7790505PW when immediate SCD response (9 µs) and non-recoverable OCD2 faults are required for safety-critical loads. |
| BQ7790508PW | Lower OV = 3900 mV and UV = 2000 mV thresholds; OCD2 = 100 mV, 90 ms delay; includes load-removal + delay recovery. | Optimized for LFP chemistries (3.2 V nominal) and high-cycle-life applications where wider voltage margins improve longevity. | Choose BQ7790508PW for LiFePO₄ packs; BQ7790505PW is specified for standard NMC/NCA Li-ion with tighter 4.25 V/cell limits. |
Compared with BQ7790503PW and BQ7790508PW, the BQ7790505PW provides the fastest short-circuit response (9 µs), strictest non-recoverable OCD2 behavior, and highest OV threshold (4250 mV), making it optimal for high-performance NMC packs where overvoltage margin and instantaneous fault isolation are prioritized over graceful recovery.
Availability
BQ7790505PW 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 automotive-grade reliability under extended temperature operation.
Supply support for BQ7790505PW 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 experience in battery management system innovation.
The BQ7790505PW belongs to TI's BQ77905 family of stackable lithium-ion protectors, designed specifically for cost-sensitive, high-reliability battery packs needing autonomous, MCU-free protection across 3–5 series cell configurations.
FAQ
What is the maximum number of series cells supported by the BQ7790505PW in standalone mode?
The BQ7790505PW supports up to 5 series cells in standalone configuration, as confirmed by its CCFG pin decoding and VC5 input functionality. When stacked with up to three additional BQ77905 devices using CHGU-to-CTRC cascading, the BQ7790505PW enables protection for battery packs with up to 20 series cells - verified in TI's SLUSCM3K datasheet Section 8.1.
Does the BQ7790505PW require external configuration components like resistors or capacitors to set protection thresholds?
No, the BQ7790505PW does not require external components to configure protection thresholds. All parameters - including OV (4250 mV), UV (2700 mV), OCD2 (60 mV), and SCD (100 mV) - are factory-programmed and laser-trimmed during wafer test. Only decoupling capacitors on VDD and AVDD are required for stable operation, per Section 7.3 of the BQ7790505PW datasheet.
How does the BQ7790505PW handle overtemperature conditions during charging versus discharging?
The BQ7790505PW implements independent temperature thresholds: overtemperature charge (OTC) triggers at 45°C and undertemperature charge (UTC) at 0°C, while overtemperature discharge (OTD) activates at 65°C and undertemperature discharge (UTD) at –20°C. These are implemented via TS/VTB thermistor interface with ratios referenced to VTB voltage, enabling distinct thermal management policies for charge and discharge paths - as detailed in Table 5-2 and Section 7.5.
What is the purpose of the CHGU and CTRC pins on the BQ7790505PW?
The CHGU (Pin 12) and CTRC (Pin 18) pins enable hierarchical stacking: CHGU outputs the upper-device CHG signal, which connects to CTRC of the device directly below it in the stack. This allows a single CHG command to propagate downward, synchronizing FET control across multiple BQ7790505PW devices in ≥6-series configurations - eliminating need for external logic or daisy-chain protocols, per Figure 9-2 and Section 6 Pin Functions.
Is the BQ7790505PW compliant with functional safety standards for automotive applications?
The BQ7790505PW is functional safety-capable, with documentation available to support ISO 26262 system-level design. While not ASIL-certified as a standalone component, TI provides FIT rate data, failure mode analysis, and diagnostic coverage metrics enabling integration into ASIL-B systems - explicitly stated in Section 1 Features and Section 12 Device and Documentation Support of the BQ7790505PW datasheet.
BQ7790505PW 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
BQ7790505PW FAQ
1.How can I place an order for BQ7790505PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ7790505PW 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 BQ7790505PW reliable?
The price and inventory of BQ7790505PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ7790505PW is usually 5 days.
3.What payment methods are accepted for BQ7790505PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ7790505PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ7790505PW?
BQ7790505PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ7790505PW 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 BQ7790505PW?
For technical support, including BQ7790505PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ7790505PW requirements.
6.How does Aetrix verify that BQ7790505PW is sourced from the original manufacturer or authorized distributors?
All BQ7790505PW 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 BQ7790505PW meets industry standards.
7.What is the process for return or replacement of BQ7790505PW?
All BQ7790505PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ7790505PW, 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 BQ7790505PW part is unused and in its original packaging.
Return procedure for BQ7790505PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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